    {-# LANGUAGE ConstraintKinds     #-}
    {-# LANGUAGE CPP                 #-}
    {-# LANGUAGE FlexibleContexts    #-}
    {-# LANGUAGE MultiWayIf          #-}
    {-# LANGUAGE ScopedTypeVariables #-}
    {-# LANGUAGE TypeApplications    #-}
    {-# LANGUAGE TypeFamilies        #-}
    {-# LANGUAGE ViewPatterns        #-}

    {-# OPTIONS_GHC -Wno-incomplete-record-updates #-}
    {-# OPTIONS_GHC -Wno-incomplete-uni-patterns   #-}

    {-
    (c) The GRASP/AQUA Project, Glasgow University, 1992-1998

    Renaming of expressions

    Basically dependency analysis.

    Handles @Match@, @GRHSs@, @HsExpr@, and @Qualifier@ datatypes.  In
    general, all of these functions return a renamed thing, and a set of
    free variables.
    -}

    module GHC.Rename.Expr (
            rnLExpr, rnExpr, rnStmts,
            AnnoBody, UnexpectedStatement(..)
       ) where

    import GHC.Prelude
    import GHC.Data.FastString

    import GHC.Rename.Bind ( rnLocalBindsAndThen, rnLocalValBindsLHS, rnLocalValBindsRHS
                            , rnMatchGroup, rnGRHS, makeMiniFixityEnv)
    import GHC.Hs
    import GHC.Tc.Errors.Types
    import GHC.Tc.Utils.Env ( isBrackStage )
    import GHC.Tc.Utils.Monad
    import GHC.Unit.Module ( getModule, isInteractiveModule )
    import GHC.Rename.Env
    import GHC.Rename.Fixity
    import GHC.Rename.Utils ( bindLocalNamesFV, checkDupNames
                            , bindLocalNames
                            , mapMaybeFvRn, mapFvRn
                            , warnUnusedLocalBinds, typeAppErr
                            , checkUnusedRecordWildcard
                            , wrapGenSpan, genHsIntegralLit, genHsTyLit
                            , genHsVar, genLHsVar, genHsApp, genHsApps, genHsApps'
                            , genAppType, isIrrefutableHsPat )
    import GHC.Rename.Unbound ( reportUnboundName )
    import GHC.Rename.Splice  ( rnTypedBracket, rnUntypedBracket, rnTypedSplice, rnUntypedSpliceExpr, checkThLocalName )
    import GHC.Rename.HsType
    import GHC.Rename.Pat
    import GHC.Driver.DynFlags
    import GHC.Builtin.Names
    import GHC.Builtin.Types ( nilDataConName )

    import GHC.Types.Basic (TypeOrKind (TypeLevel))
    import GHC.Types.FieldLabel
    import GHC.Types.Fixity
    import GHC.Types.Id.Make
    import GHC.Types.Name
    import GHC.Types.Name.Set
    import GHC.Types.Name.Reader
    import GHC.Types.Unique.Set
    import GHC.Types.SourceText
    import GHC.Types.SrcLoc
    import GHC.Utils.Misc
    import GHC.Data.List.SetOps ( removeDupsOn )
    import GHC.Data.Maybe
    import GHC.Utils.Error
    import GHC.Utils.Panic
    import GHC.Utils.Outputable as Outputable

    import qualified GHC.LanguageExtensions as LangExt

    import Language.Haskell.Syntax.Basic (FieldLabelString(..))

    import Control.Monad
    import Data.List (unzip4, minimumBy)
    import Data.List.NonEmpty ( NonEmpty(..), nonEmpty )
    import Control.Arrow (first)
    import Data.Ord
    import Data.Array
    import qualified Data.List.NonEmpty as NE

    {- Note [Handling overloaded and rebindable constructs]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Nomenclature
    -------------
    * Expansion (`HsExpr GhcRn -> HsExpr GhcRn`): expand between renaming and
      typechecking, using the `XXExprGhcRn` constructor of `HsExpr`.
    * Desugaring (`HsExpr GhcTc -> Core.Expr`): convert the typechecked `HsSyn` to Core.  This is done in GHC.HsToCore

    For overloaded constructs (overloaded literals, lists, strings), and
    rebindable constructs (e.g. if-then-else), our general plan is this,
    using overloaded labels #foo as an example:

    * In the RENAMER: transform
          HsOverLabel "foo"
          ==> XExpr (ExpandedThingRn (HsOverLabel #foo)
                                     (fromLabel `HsAppType` "foo"))
      We write this more compactly in concrete-syntax form like this
          #foo  ==>  fromLabel @"foo"

      Recall that in (ExpandedThingRn orig expanded), 'orig' is the original term
      the user wrote, and 'expanded' is the expanded or desugared version
      to be typechecked.

    * In the TYPECHECKER: typecheck the expansion, in this case
          fromLabel @"foo"
      The typechecker (and desugarer) will never see HsOverLabel

    In effect, the renamer does a bit of desugaring. Recall GHC.Hs.Expr
    Note [Rebindable syntax and XXExprGhcRn], which describes the use of XXExprGhcRn.

    RebindableSyntax:
      If RebindableSyntax is off we use the built-in 'fromLabel', defined in
         GHC.Builtin.Names.fromLabelClassOpName
      If RebindableSyntax if ON, we look up "fromLabel" in the environment
         to get whichever one is in scope.
    This is accomplished by lookupSyntaxName, and it applies to all the
    constructs below.

    See also Note [Handling overloaded and rebindable patterns] in GHC.Rename.Pat
    for the story with patterns.

    Here are the expressions that we transform in this way. Some are uniform,
    but several have a little bit of special treatment:

    * HsIf (if-the-else)
         if b then e1 else e2  ==>  ifThenElse b e1 e2
      We do this /only/ if rebindable syntax is on, because the coverage
      checker looks for HsIf (see GHC.HsToCore.Ticks.addTickHsExpr)
      That means the typechecker and desugarer need to understand HsIf
      for the non-rebindable-syntax case.

    * OverLabel (overloaded labels, #lbl)
         #lbl  ==>  fromLabel @"lbl"
      As ever, we use lookupSyntaxName to look up 'fromLabel'
      See Note [Overloaded labels] below

    * ExplicitList (explicit lists [a,b,c])
      When (and only when) OverloadedLists is on
         [e1,e2]  ==>  fromListN 2 [e1,e2]
      NB: the type checker and desugarer still see ExplicitList,
          but to them it always means the built-in lists.

    * SectionL and SectionR (left and right sections)
         (`op` e) ==> rightSection op e
         (e `op`) ==> leftSection  (op e)
      where `leftSection` and `rightSection` are representation-polymorphic
      wired-in Ids. See Note [Left and right sections]

    * To understand why expansions for `OpApp` is done in `GHC.Tc.Gen.Head.splitHsApps`
      see Note [Doing XXExprGhcRn in the Renamer vs Typechecker] below.

    * RecordUpd: we desugar record updates into case expressions,
      in GHC.Tc.Gen.Expr.tcExpr.

      Example:

        data T p q = T1 { x :: Int, y :: Bool, z :: Char }
                   | T2 { v :: Char }
                   | T3 { x :: Int }
                   | T4 { p :: Float, y :: Bool, x :: Int }
                   | T5

        e { x=e1, y=e2 }
          ===>
        let { x' = e1; y' = e2 } in
        case e of
           T1 _ _ z -> T1 x' y' z
           T4 p _ _ -> T4 p y' x'

      See Note [Record Updates] in GHC.Tc.Gen.Expr for more details.

      To understand Why is this done in the typechecker, and not in the renamer
      see Note [Doing XXExprGhcRn in the Renamer vs Typechecker]

    * HsDo: We expand `HsDo` statements in `Ghc.Tc.Gen.Do`.

        - For example, a user written code:

                      do { x <- e1 ; g x ; return (f x) }

          is expanded to:

                       (>>=) e1
                             (\x -> ((>>) (g x)
                                          (return (f x))))

         See Note [Expanding HsDo with XXExprGhcRn] in `Ghc.Tc.Gen.Do` for more details.
         To understand why is this done in the typechecker and not in the renamer.
         See Note [Doing XXExprGhcRn in the Renamer vs Typechecker]

    Note [Overloaded labels]
    ~~~~~~~~~~~~~~~~~~~~~~~~
    For overloaded labels, note that we /only/ apply `fromLabel` to the
    Symbol argument, so the resulting expression has type
        fromLabel @"foo" :: forall a. IsLabel "foo" a => a
    Now ordinary Visible Type Application can be used to instantiate the 'a':
    the user may have written (#foo @Int).

    Notice that this all works fine in a kind-polymorphic setting (#19154).
    Suppose we have
        fromLabel :: forall {k1} {k2} (a:k1). blah

    Then we want to instantiate those inferred quantifiers k1,k2, before
    type-applying to "foo", so we get
        fromLabel @Symbol @blah @"foo" ...

    And those inferred kind quantifiers will indeed be instantiated when we
    typecheck the renamed-syntax call (fromLabel @"foo").

    Note [Doing XXExprGhcRn in the Renamer vs Typechecker]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    We expand some `HsExpr GhcRn` code at various places, usually, on the fly,
    depending on when it is more convenient. It may be beneficial to have a
    separate `HsExpr GhcRn -> HsExpr GhcRn` pass that does this expansion uniformly
    in the future when we have enough cases to cater for. For the time being,
    this note documents which language feature is expanded at which phase,
    and the reasons for doing so.

      ** `HsIf` Expansions
      --------------------
      `HsIf` expansions are expanded in the Renamer becuase it is more convinent
      to do so there and then not worry about it in the later stage.
      `-XRebindableSyntax` is used to decide whether we use the `HsIf` or user defined if

      ** `OpApp` Expansions
      ---------------------
      The typechecker turns `OpApp` into a use of `XXExprGhcRn`
      on the fly, in `GHC.Tc.Gen.Head.splitHsApps`.
      The language extension `RebindableSyntax` does not affect this behaviour.

      It's a bit painful to transform `OpApp e1 op e2` to a `XXExprGhcRn`
      form, because the renamer does precedence rearrangement after name
      resolution. So the renamer leaves an `OpApp` as an `OpApp`.

      ** Record Update Syntax `RecordUpd` Expansions
      ----------------------------------------------
      This is done in the typechecker on the fly (`GHC.Tc.Expr.tcExpr`), and not the renamer, for two reasons:

        - (Until we implement GHC proposal #366)
          We need to know the type of the record to disambiguate its fields.

        - We use the type signature of the data constructor to provide `IdSigs`
          to the let-bound variables (x', y' in the example of
          Note [Handling overloaded and rebindable constructs] above).
          This is needed to accept programs such as

              data R b = MkR { f :: (forall a. a -> a) -> (Int,b), c :: Int }
              foo r = r { f = \ k -> (k 3, k 'x') }

          in which an updated field has a higher-rank type.
          See Wrinkle [Using IdSig] in Note [Record Updates] in GHC.Tc.Gen.Expr.

      ** `HsDo` Statement Expansions
      -----------------------------------
      The expansion for do block statements is done on the fly right before typechecking in `GHC.Tc.Gen.Expr`
      using `GHC.Tc.Gen.Do.expandDoStmts`. There are 2 main reasons:

      -  During the renaming phase, we may not have all the constructor details `HsConDetails` populated in the
         data structure. This would result in an inaccurate irrefutability analysis causing
         the continuation lambda body to be wrapped with `fail` alternatives when not needed.
         See Part 1. of Note [Expanding HsDo with XXExprGhcRn] (test pattern-fails.hs)

      -  If the expansion is done on the fly during renaming, expressions that
         have explicit type applications using (-XTypeApplciations) will not work (cf. Let statements expansion)
         as the name freshening happens from the root of the AST to the leaves,
         but the expansion happens in the opposite direction (from leaves to the root),
         causing the renamer to miss the scoped type variables.
    -}

    {-
    ************************************************************************
    *                                                                      *
    \subsubsection{Expressions}
    *                                                                      *
    ************************************************************************
    -}

    rnExprs :: [LHsExpr GhcPs] -> RnM ([LHsExpr GhcRn], FreeVars)
    rnExprs :: [LHsExpr GhcPs] -> RnM ([XRec GhcRn (HsExpr GhcRn)], FreeVars)
    rnExprs [LHsExpr GhcPs]
    ls = [GenLocated SrcSpanAnnA (HsExpr GhcPs)]
    -> FreeVars
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated SrcSpanAnnA (HsExpr GhcRn)], FreeVars)
    rnExprs' [LHsExpr GhcPs]
    [GenLocated SrcSpanAnnA (HsExpr GhcPs)]
    ls FreeVars
    forall a. UniqSet a
    emptyUniqSet
     where
      rnExprs' :: [GenLocated SrcSpanAnnA (HsExpr GhcPs)]
    -> FreeVars
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated SrcSpanAnnA (HsExpr GhcRn)], FreeVars)
    rnExprs' [] FreeVars
    acc = ([GenLocated SrcSpanAnnA (HsExpr GhcRn)], FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated SrcSpanAnnA (HsExpr GhcRn)], FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([], FreeVars
    acc)
      rnExprs' (GenLocated SrcSpanAnnA (HsExpr GhcPs)
    expr:[GenLocated SrcSpanAnnA (HsExpr GhcPs)]
    exprs) FreeVars
    acc =
       do { (expr', fvExpr) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    GenLocated SrcSpanAnnA (HsExpr GhcPs)
    expr
            -- Now we do a "seq" on the free vars because typically it's small
            -- or empty, especially in very long lists of constants
          ; let  acc' = FreeVars
    acc FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvExpr
          ; (exprs', fvExprs) <- acc' `seq` rnExprs' exprs acc'
          ; return (expr':exprs', fvExprs) }

    -- Variables. We look up the variable and return the resulting name.

    rnLExpr :: LHsExpr GhcPs -> RnM (LHsExpr GhcRn, FreeVars)
    rnLExpr :: LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr = (HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars))
    -> GenLocated SrcSpanAnnA (HsExpr GhcPs)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    forall a b c ann.
    (a -> TcM (b, c))
    -> GenLocated (EpAnn ann) a -> TcM (GenLocated (EpAnn ann) b, c)
    wrapLocFstMA HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnExpr

    rnExpr :: HsExpr GhcPs -> RnM (HsExpr GhcRn, FreeVars)

    finishHsVar :: LocatedA Name -> RnM (HsExpr GhcRn, FreeVars)
    -- Separated from rnExpr because it's also used
    -- when renaming infix expressions
    finishHsVar :: LocatedA Name -> TcM (HsExpr GhcRn, FreeVars)
    finishHsVar (L SrcSpanAnnA
    l Name
    name)
     = do { this_mod <- IOEnv (Env TcGblEnv TcLclEnv) Module
    forall (m :: * -> *). HasModule m => m Module
    getModule
          ; when (nameIsLocalOrFrom this_mod name) $
            checkThLocalName name
          ; return (HsVar noExtField (L (l2l l) name), unitFV name) }

    rnUnboundVar :: RdrName -> RnM (HsExpr GhcRn, FreeVars)
    rnUnboundVar :: RdrName -> TcM (HsExpr GhcRn, FreeVars)
    rnUnboundVar RdrName
    v = do
      deferOutofScopeVariables <- GeneralFlag -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. GeneralFlag -> TcRnIf gbl lcl Bool
    goptM GeneralFlag
    Opt_DeferOutOfScopeVariables
      -- See Note [Reporting unbound names] for difference between qualified and unqualified names.
      unless (isUnqual v || deferOutofScopeVariables) (reportUnboundName v >> return ())
      return (HsUnboundVar noExtField v, emptyFVs)

    rnExpr :: HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnExpr (HsVar XVar GhcPs
    _ (L SrcSpanAnnN
    l RdrName
    v))
      = do { dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
    forall (m :: * -> *). HasDynFlags m => m DynFlags
    getDynFlags
           ; mb_gre <- lookupExprOccRn v
           ; case mb_gre of {
               Maybe GlobalRdrElt
    Nothing -> RdrName -> TcM (HsExpr GhcRn, FreeVars)
    rnUnboundVar RdrName
    v ;
               Just GlobalRdrElt
    gre ->
        do { let nm :: Name
    nm   = GlobalRdrElt -> Name
    forall info. GlobalRdrEltX info -> Name
    greName GlobalRdrElt
    gre
                 info :: GREInfo
    info = GlobalRdrElt -> GREInfo
    greInfo GlobalRdrElt
    gre
           ; if | IAmRecField RecFieldInfo
    fld_info <- GREInfo
    info
                -- Since GHC 9.4, such occurrences of record fields must be
                -- unambiguous. For ambiguous occurrences, we arbitrarily pick one
                -- matching GRE and add a name clash error
                -- (see lookupGlobalOccRn_overloaded, called by lookupExprOccRn).
                -> do { let sel_name :: Name
    sel_name = FieldLabel -> Name
    flSelector (FieldLabel -> Name) -> FieldLabel -> Name
    forall a b. (a -> b) -> a -> b
    $ RecFieldInfo -> FieldLabel
    recFieldLabel RecFieldInfo
    fld_info
                      ; this_mod <- IOEnv (Env TcGblEnv TcLclEnv) Module
    forall (m :: * -> *). HasModule m => m Module
    getModule
                      ; when (nameIsLocalOrFrom this_mod sel_name) $
                          checkThLocalName sel_name
                      ; return (HsRecSel noExtField (FieldOcc sel_name (L l v) ), unitFV sel_name)
                      }
                | Name
    nm Name -> Name -> Bool
    forall a. Eq a => a -> a -> Bool
    == Name
    nilDataConName
                  -- Treat [] as an ExplicitList, so that
                  -- OverloadedLists works correctly
                  -- Note [Empty lists] in GHC.Hs.Expr
                , Extension -> DynFlags -> Bool
    xopt Extension
    LangExt.OverloadedLists DynFlags
    dflags
                -> HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnExpr (XExplicitList GhcPs -> [LHsExpr GhcPs] -> HsExpr GhcPs
    forall p. XExplicitList p -> [LHsExpr p] -> HsExpr p
    ExplicitList XExplicitList GhcPs
    AnnList
    forall a. NoAnn a => a
    noAnn [])

                | Bool
    otherwise
                -> LocatedA Name -> TcM (HsExpr GhcRn, FreeVars)
    finishHsVar (SrcSpanAnnA -> Name -> LocatedA Name
    forall l e. l -> e -> GenLocated l e
    L (SrcSpanAnnN -> SrcSpanAnnA
    forall a b. (HasLoc a, HasAnnotation b) => a -> b
    l2l SrcSpanAnnN
    l) Name
    nm)
            }}}

    rnExpr (HsIPVar XIPVar GhcPs
    x HsIPName
    v)
      = (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (XIPVar GhcRn -> HsIPName -> HsExpr GhcRn
    forall p. XIPVar p -> HsIPName -> HsExpr p
    HsIPVar XIPVar GhcPs
    XIPVar GhcRn
    x HsIPName
    v, FreeVars
    emptyFVs)

    rnExpr (HsUnboundVar XUnboundVar GhcPs
    _ RdrName
    v)
      = (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (XUnboundVar GhcRn -> RdrName -> HsExpr GhcRn
    forall p. XUnboundVar p -> RdrName -> HsExpr p
    HsUnboundVar XUnboundVar GhcRn
    NoExtField
    noExtField RdrName
    v, FreeVars
    emptyFVs)

    -- HsOverLabel: see Note [Handling overloaded and rebindable constructs]
    rnExpr (HsOverLabel XOverLabel GhcPs
    _ SourceText
    src FastString
    v)
      = do { (from_label, fvs) <- Name -> RnM (Name, FreeVars)
    lookupSyntaxName Name
    fromLabelClassOpName
           ; return ( mkExpandedExpr (HsOverLabel noExtField src v) $
                      HsAppType noExtField (genLHsVar from_label) hs_ty_arg
                    , fvs ) }
      where
        hs_ty_arg :: HsWildCardBndrs GhcRn (LocatedAn AnnListItem (HsType GhcRn))
    hs_ty_arg = LocatedAn AnnListItem (HsType GhcRn)
    -> HsWildCardBndrs GhcRn (LocatedAn AnnListItem (HsType GhcRn))
    forall thing. thing -> HsWildCardBndrs GhcRn thing
    mkEmptyWildCardBndrs (LocatedAn AnnListItem (HsType GhcRn)
     -> HsWildCardBndrs GhcRn (LocatedAn AnnListItem (HsType GhcRn)))
    -> LocatedAn AnnListItem (HsType GhcRn)
    -> HsWildCardBndrs GhcRn (LocatedAn AnnListItem (HsType GhcRn))
    forall a b. (a -> b) -> a -> b
    $ HsType GhcRn -> LocatedAn AnnListItem (HsType GhcRn)
    forall an a. NoAnn an => a -> LocatedAn an a
    wrapGenSpan (HsType GhcRn -> LocatedAn AnnListItem (HsType GhcRn))
    -> HsType GhcRn -> LocatedAn AnnListItem (HsType GhcRn)
    forall a b. (a -> b) -> a -> b
    $
                    XTyLit GhcRn -> HsTyLit GhcRn -> HsType GhcRn
    forall pass. XTyLit pass -> HsTyLit pass -> HsType pass
    HsTyLit XTyLit GhcRn
    NoExtField
    noExtField (XStrTy GhcRn -> FastString -> HsTyLit GhcRn
    forall pass. XStrTy pass -> FastString -> HsTyLit pass
    HsStrTy XStrTy GhcRn
    SourceText
    NoSourceText FastString
    v)

    rnExpr (HsLit XLitE GhcPs
    x lit :: HsLit GhcPs
    lit@(HsString XHsString GhcPs
    src FastString
    s))
      = do { opt_OverloadedStrings <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
    xoptM Extension
    LangExt.OverloadedStrings
           ; if opt_OverloadedStrings then
                rnExpr (HsOverLit x (mkHsIsString src s))
             else do {
                ; rnLit lit
                ; return (HsLit x (convertLit lit), emptyFVs) } }

    rnExpr (HsLit XLitE GhcPs
    x HsLit GhcPs
    lit)
      = do { HsLit GhcPs -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall p. HsLit p -> IOEnv (Env TcGblEnv TcLclEnv) ()
    rnLit HsLit GhcPs
    lit
           ; (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (XLitE GhcRn -> HsLit GhcRn -> HsExpr GhcRn
    forall p. XLitE p -> HsLit p -> HsExpr p
    HsLit XLitE GhcPs
    XLitE GhcRn
    x(HsLit GhcPs -> HsLit GhcRn
    forall (p1 :: Pass) (p2 :: Pass).
    HsLit (GhcPass p1) -> HsLit (GhcPass p2)
    convertLit HsLit GhcPs
    lit), FreeVars
    emptyFVs) }

    rnExpr (HsOverLit XOverLitE GhcPs
    x HsOverLit GhcPs
    lit)
      = do { ((lit', mb_neg), fvs) <- HsOverLit GhcPs
    -> RnM ((HsOverLit GhcRn, Maybe (HsExpr GhcRn)), FreeVars)
    forall t.
    (XXOverLit t ~ DataConCantHappen) =>
    HsOverLit t
    -> RnM ((HsOverLit GhcRn, Maybe (HsExpr GhcRn)), FreeVars)
    rnOverLit HsOverLit GhcPs
    lit -- See Note [Negative zero]
           ; case mb_neg of
                  Maybe (HsExpr GhcRn)
    Nothing -> (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (XOverLitE GhcRn -> HsOverLit GhcRn -> HsExpr GhcRn
    forall p. XOverLitE p -> HsOverLit p -> HsExpr p
    HsOverLit XOverLitE GhcPs
    XOverLitE GhcRn
    x HsOverLit GhcRn
    lit', FreeVars
    fvs)
                  Just HsExpr GhcRn
    neg ->
                     (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (XApp GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XApp p -> LHsExpr p -> LHsExpr p -> HsExpr p
    HsApp XApp GhcRn
    NoExtField
    noExtField (HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall e a. HasAnnotation e => a -> GenLocated e a
    noLocA HsExpr GhcRn
    neg) (HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall e a. HasAnnotation e => a -> GenLocated e a
    noLocA (XOverLitE GhcRn -> HsOverLit GhcRn -> HsExpr GhcRn
    forall p. XOverLitE p -> HsOverLit p -> HsExpr p
    HsOverLit XOverLitE GhcPs
    XOverLitE GhcRn
    x HsOverLit GhcRn
    lit'))
                            , FreeVars
    fvs ) }

    rnExpr (HsApp XApp GhcPs
    x LHsExpr GhcPs
    fun LHsExpr GhcPs
    arg)
      = do { (fun',fvFun) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    fun
           ; (arg',fvArg) <- rnLExpr arg
           ; return (HsApp x fun' arg', fvFun `plusFV` fvArg) }

    rnExpr (HsAppType XAppTypeE GhcPs
    _ LHsExpr GhcPs
    fun LHsWcType (NoGhcTc GhcPs)
    arg)
      = do { type_app <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
    xoptM Extension
    LangExt.TypeApplications
           ; unless type_app $ addErr $ typeAppErr TypeLevel $ hswc_body arg
           ; (fun',fvFun) <- rnLExpr fun
           ; (arg',fvArg) <- rnHsWcType HsTypeCtx arg
           ; return (HsAppType noExtField fun' arg', fvFun `plusFV` fvArg) }

    rnExpr (OpApp XOpApp GhcPs
    _ LHsExpr GhcPs
    e1 LHsExpr GhcPs
    op LHsExpr GhcPs
    e2)
      = do  { (e1', fv_e1) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    e1
            ; (e2', fv_e2) <- rnLExpr e2
            ; (op', fv_op) <- rnLExpr op

            -- Deal with fixity
            -- When renaming code synthesised from "deriving" declarations
            -- we used to avoid fixity stuff, but we can't easily tell any
            -- more, so I've removed the test.  Adding HsPars in GHC.Tc.Deriv.Generate
            -- should prevent bad things happening.
            ; fixity <- case op' of
                  L SrcSpanAnnA
    _ (HsVar XVar GhcRn
    _ (L SrcSpanAnnN
    _ Name
    n)) -> Name -> IOEnv (Env TcGblEnv TcLclEnv) Fixity
    lookupFixityRn Name
    n
                  L SrcSpanAnnA
    _ (HsRecSel XRecSel GhcRn
    _ FieldOcc GhcRn
    f)    -> FieldOcc GhcRn -> IOEnv (Env TcGblEnv TcLclEnv) Fixity
    lookupFieldFixityRn FieldOcc GhcRn
    f
                  GenLocated SrcSpanAnnA (HsExpr GhcRn)
    _ -> Fixity -> IOEnv (Env TcGblEnv TcLclEnv) Fixity
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (SourceText -> Int -> FixityDirection -> Fixity
    Fixity SourceText
    NoSourceText Int
    minPrecedence FixityDirection
    InfixL)
                       -- c.f. lookupFixity for unbound

            ; lexical_negation <- xoptM LangExt.LexicalNegation
            ; let negation_handling | Bool
    lexical_negation = NegationHandling
    KeepNegationIntact
                                    | Bool
    otherwise = NegationHandling
    ReassociateNegation
            ; final_e <- mkOpAppRn negation_handling e1' op' fixity e2'
            ; return (final_e, fv_e1 `plusFV` fv_op `plusFV` fv_e2) }

    rnExpr (NegApp XNegApp GhcPs
    _ LHsExpr GhcPs
    e SyntaxExpr GhcPs
    _)
      = do { (e', fv_e)         <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    e
           ; (neg_name, fv_neg) <- lookupSyntax negateName
           ; final_e            <- mkNegAppRn e' neg_name
           ; return (final_e, fv_e `plusFV` fv_neg) }

    ------------------------------------------
    -- Record dot syntax

    rnExpr (HsGetField XGetField GhcPs
    _ LHsExpr GhcPs
    e XRec GhcPs (DotFieldOcc GhcPs)
    f)
     = do { (getField, fv_getField) <- Name -> RnM (Name, FreeVars)
    lookupSyntaxName Name
    getFieldName
          ; (e, fv_e) <- rnLExpr e
          ; let f' = LocatedAn NoEpAnns (DotFieldOcc GhcPs)
    -> LocatedAn NoEpAnns (DotFieldOcc GhcRn)
    rnDotFieldOcc XRec GhcPs (DotFieldOcc GhcPs)
    LocatedAn NoEpAnns (DotFieldOcc GhcPs)
    f
          ; return ( mkExpandedExpr
                       (HsGetField noExtField e f')
                       (mkGetField getField e (fmap (unLoc . dfoLabel) f'))
                   , fv_e `plusFV` fv_getField ) }

    rnExpr (HsProjection XProjection GhcPs
    _ NonEmpty (XRec GhcPs (DotFieldOcc GhcPs))
    fs)
      = do { (getField, fv_getField) <- Name -> RnM (Name, FreeVars)
    lookupSyntaxName Name
    getFieldName
           ; circ <- lookupOccRn compose_RDR
           ; let fs' = (LocatedAn NoEpAnns (DotFieldOcc GhcPs)
     -> LocatedAn NoEpAnns (DotFieldOcc GhcRn))
    -> NonEmpty (LocatedAn NoEpAnns (DotFieldOcc GhcPs))
    -> NonEmpty (LocatedAn NoEpAnns (DotFieldOcc GhcRn))
    forall a b. (a -> b) -> NonEmpty a -> NonEmpty b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap LocatedAn NoEpAnns (DotFieldOcc GhcPs)
    -> LocatedAn NoEpAnns (DotFieldOcc GhcRn)
    rnDotFieldOcc NonEmpty (XRec GhcPs (DotFieldOcc GhcPs))
    NonEmpty (LocatedAn NoEpAnns (DotFieldOcc GhcPs))
    fs
           ; return ( mkExpandedExpr
                        (HsProjection noExtField fs')
                        (mkProjection getField circ (fmap (fmap (unLoc . dfoLabel)) fs'))
                    , unitFV circ `plusFV` fv_getField) }

    ------------------------------------------
    -- Template Haskell extensions
    rnExpr e :: HsExpr GhcPs
    e@(HsTypedBracket XTypedBracket GhcPs
    _ LHsExpr GhcPs
    br_body)   = HsExpr GhcPs -> LHsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnTypedBracket HsExpr GhcPs
    e LHsExpr GhcPs
    br_body
    rnExpr e :: HsExpr GhcPs
    e@(HsUntypedBracket XUntypedBracket GhcPs
    _ HsQuote GhcPs
    br_body) = HsExpr GhcPs -> HsQuote GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnUntypedBracket HsExpr GhcPs
    e HsQuote GhcPs
    br_body

    rnExpr (HsTypedSplice   XTypedSplice GhcPs
    _ LHsExpr GhcPs
    splice) = LHsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnTypedSplice LHsExpr GhcPs
    splice
    rnExpr (HsUntypedSplice XUntypedSplice GhcPs
    _ HsUntypedSplice GhcPs
    splice) = HsUntypedSplice GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnUntypedSpliceExpr HsUntypedSplice GhcPs
    splice

    ---------------------------------------------
    --      Sections
    -- See Note [Parsing sections] in GHC.Parser
    rnExpr (HsPar XPar GhcPs
    _ (L SrcSpanAnnA
    loc (section :: HsExpr GhcPs
    section@(SectionL {}))))
      = do  { (section', fvs) <- HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnSection HsExpr GhcPs
    section
            ; return (HsPar noExtField (L loc section'), fvs) }

    rnExpr (HsPar XPar GhcPs
    _ (L SrcSpanAnnA
    loc (section :: HsExpr GhcPs
    section@(SectionR {}))))
      = do  { (section', fvs) <- HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnSection HsExpr GhcPs
    section
            ; return (HsPar noExtField (L loc section'), fvs) }

    rnExpr (HsPar XPar GhcPs
    _ LHsExpr GhcPs
    e)
      = do  { (e', fvs_e) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    e
            ; return (HsPar noExtField e', fvs_e) }

    rnExpr expr :: HsExpr GhcPs
    expr@(SectionL {})
      = do  { TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (HsExpr GhcPs -> TcRnMessage
    sectionErr HsExpr GhcPs
    expr); HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnSection HsExpr GhcPs
    expr }
    rnExpr expr :: HsExpr GhcPs
    expr@(SectionR {})
      = do  { TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (HsExpr GhcPs -> TcRnMessage
    sectionErr HsExpr GhcPs
    expr); HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnSection HsExpr GhcPs
    expr }

    ---------------------------------------------
    rnExpr (HsPragE XPragE GhcPs
    x HsPragE GhcPs
    prag LHsExpr GhcPs
    expr)
      = do { (expr', fvs_expr) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
           ; return (HsPragE x (rn_prag prag) expr', fvs_expr) }
      where
        rn_prag :: HsPragE GhcPs -> HsPragE GhcRn
        rn_prag :: HsPragE GhcPs -> HsPragE GhcRn
    rn_prag (HsPragSCC XSCC GhcPs
    x StringLiteral
    ann) = XSCC GhcRn -> StringLiteral -> HsPragE GhcRn
    forall p. XSCC p -> StringLiteral -> HsPragE p
    HsPragSCC XSCC GhcPs
    XSCC GhcRn
    x StringLiteral
    ann

    rnExpr (HsLam XLam GhcPs
    x HsLamVariant
    lam_variant MatchGroup GhcPs (LHsExpr GhcPs)
    matches)
      = do { (matches', fvs_ms) <- HsMatchContextRn
    -> (GenLocated SrcSpanAnnA (HsExpr GhcPs)
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars))
    -> MatchGroup GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    -> RnM
         (MatchGroup GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)),
          FreeVars)
    forall (body :: * -> *).
    (Outputable (body GhcPs), AnnoBody body) =>
    HsMatchContextRn
    -> (LocatedA (body GhcPs) -> RnM (LocatedA (body GhcRn), FreeVars))
    -> MatchGroup GhcPs (LocatedA (body GhcPs))
    -> RnM (MatchGroup GhcRn (LocatedA (body GhcRn)), FreeVars)
    rnMatchGroup (HsLamVariant -> HsMatchContext (GenLocated SrcSpanAnnN Name)
    forall fn. HsLamVariant -> HsMatchContext fn
    LamAlt HsLamVariant
    lam_variant) LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    GenLocated SrcSpanAnnA (HsExpr GhcPs)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    rnLExpr MatchGroup GhcPs (LHsExpr GhcPs)
    MatchGroup GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    matches
           ; return (HsLam x lam_variant matches', fvs_ms) }

    rnExpr (HsCase XCase GhcPs
    _ LHsExpr GhcPs
    expr MatchGroup GhcPs (LHsExpr GhcPs)
    matches)
      = do { (new_expr, e_fvs) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
           ; (new_matches, ms_fvs) <- rnMatchGroup CaseAlt rnLExpr matches
           ; return (HsCase CaseAlt new_expr new_matches, e_fvs `plusFV` ms_fvs) }

    rnExpr (HsLet XLet GhcPs
    _ HsLocalBinds GhcPs
    binds LHsExpr GhcPs
    expr)
      = HsLocalBinds GhcPs
    -> (HsLocalBinds GhcRn -> FreeVars -> TcM (HsExpr GhcRn, FreeVars))
    -> TcM (HsExpr GhcRn, FreeVars)
    forall result.
    HsLocalBinds GhcPs
    -> (HsLocalBinds GhcRn -> FreeVars -> RnM (result, FreeVars))
    -> RnM (result, FreeVars)
    rnLocalBindsAndThen HsLocalBinds GhcPs
    binds ((HsLocalBinds GhcRn -> FreeVars -> TcM (HsExpr GhcRn, FreeVars))
     -> TcM (HsExpr GhcRn, FreeVars))
    -> (HsLocalBinds GhcRn -> FreeVars -> TcM (HsExpr GhcRn, FreeVars))
    -> TcM (HsExpr GhcRn, FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \HsLocalBinds GhcRn
    binds' FreeVars
    _ -> do
          { (expr',fvExpr) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
          ; return (HsLet noExtField binds' expr', fvExpr) }

    rnExpr (HsDo XDo GhcPs
    _ HsDoFlavour
    do_or_lc (L SrcSpanAnnL
    l [GenLocated
       SrcSpanAnnA
       (StmtLR GhcPs GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs)))]
    stmts))
     = do { ((stmts1, _), fvs1) <-
              HsStmtContextRn
    -> (HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars))
    -> [LStmt GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))]
    -> ([Name] -> RnM ((), FreeVars))
    -> RnM
         (([(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)),
             FreeVars)],
           ()),
          FreeVars)
    forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing),
          FreeVars)
    rnStmtsWithFreeVars (HsDoFlavour -> HsStmtContext (GenLocated SrcSpanAnnN Name)
    forall fn. HsDoFlavour -> HsStmtContext fn
    HsDoStmt HsDoFlavour
    do_or_lc) HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnExpr [LStmt GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcPs GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs)))]
    stmts
                (\ [Name]
    _ -> ((), FreeVars) -> RnM ((), FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ((), FreeVars
    emptyFVs))
          ; (pp_stmts, fvs2) <- postProcessStmtsForApplicativeDo do_or_lc stmts1
          ; return ( HsDo noExtField do_or_lc (L l pp_stmts), fvs1 `plusFV` fvs2 ) }
    -- ExplicitList: see Note [Handling overloaded and rebindable constructs]
    rnExpr (ExplicitList XExplicitList GhcPs
    _ [LHsExpr GhcPs]
    exps)
      = do  { (exps', fvs) <- [LHsExpr GhcPs] -> RnM ([XRec GhcRn (HsExpr GhcRn)], FreeVars)
    rnExprs [LHsExpr GhcPs]
    exps
            ; opt_OverloadedLists <- xoptM LangExt.OverloadedLists
            ; if not opt_OverloadedLists
              then return  (ExplicitList noExtField exps', fvs)
              else
        do { (from_list_n_name, fvs') <- lookupSyntaxName fromListNName
           ; loc <- getSrcSpanM -- See Note [Source locations for implicit function calls]
           ; let rn_list  = XExplicitList GhcRn -> [XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn
    forall p. XExplicitList p -> [LHsExpr p] -> HsExpr p
    ExplicitList XExplicitList GhcRn
    NoExtField
    noExtField [XRec GhcRn (HsExpr GhcRn)]
    [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    exps'
                 lit_n    = Int -> IntegralLit
    forall a. Integral a => a -> IntegralLit
    mkIntegralLit ([GenLocated SrcSpanAnnA (HsExpr GhcPs)] -> Int
    forall a. [a] -> Int
    forall (t :: * -> *) a. Foldable t => t a -> Int
    length [LHsExpr GhcPs]
    [GenLocated SrcSpanAnnA (HsExpr GhcPs)]
    exps)
                 hs_lit   = IntegralLit -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall an. NoAnn an => IntegralLit -> LocatedAn an (HsExpr GhcRn)
    genHsIntegralLit IntegralLit
    lit_n
                 exp_list = GenLocated SrcSpanAnnN Name
    -> [XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn
    genHsApps' (SrcSpanAnnN -> Name -> GenLocated SrcSpanAnnN Name
    forall l e. l -> e -> GenLocated l e
    L (SrcSpan -> SrcSpanAnnN
    forall e. HasAnnotation e => SrcSpan -> e
    noAnnSrcSpan SrcSpan
    loc) Name
    from_list_n_name) [XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    hs_lit, HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall an a. NoAnn an => a -> LocatedAn an a
    wrapGenSpan HsExpr GhcRn
    rn_list]
           ; return ( mkExpandedExpr rn_list exp_list
                    , fvs `plusFV` fvs') } }

    rnExpr (ExplicitTuple XExplicitTuple GhcPs
    _ [HsTupArg GhcPs]
    tup_args Boxity
    boxity)
      = do { [HsTupArg GhcPs] -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkTupleSection [HsTupArg GhcPs]
    tup_args
           ; (tup_args', fvs) <- (HsTupArg GhcPs
     -> IOEnv (Env TcGblEnv TcLclEnv) (HsTupArg GhcRn, FreeVars))
    -> [HsTupArg GhcPs]
    -> IOEnv (Env TcGblEnv TcLclEnv) ([HsTupArg GhcRn], [FreeVars])
    forall (m :: * -> *) a b c.
    Applicative m =>
    (a -> m (b, c)) -> [a] -> m ([b], [c])
    mapAndUnzipM HsTupArg GhcPs
    -> IOEnv (Env TcGblEnv TcLclEnv) (HsTupArg GhcRn, FreeVars)
    rnTupArg [HsTupArg GhcPs]
    tup_args
           ; return (ExplicitTuple noExtField tup_args' boxity, plusFVs fvs) }
      where
        rnTupArg :: HsTupArg GhcPs
    -> IOEnv (Env TcGblEnv TcLclEnv) (HsTupArg GhcRn, FreeVars)
    rnTupArg (Present XPresent GhcPs
    x LHsExpr GhcPs
    e) = do { (e',fvs) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    e
                                    ; return (Present x e', fvs) }
        rnTupArg (Missing XMissing GhcPs
    _) = (HsTupArg GhcRn, FreeVars)
    -> IOEnv (Env TcGblEnv TcLclEnv) (HsTupArg GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (XMissing GhcRn -> HsTupArg GhcRn
    forall id. XMissing id -> HsTupArg id
    Missing XMissing GhcRn
    NoExtField
    noExtField, FreeVars
    emptyFVs)

    rnExpr (ExplicitSum XExplicitSum GhcPs
    _ Int
    alt Int
    arity LHsExpr GhcPs
    expr)
      = do { (expr', fvs) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
           ; return (ExplicitSum noExtField alt arity expr', fvs) }

    rnExpr (RecordCon { rcon_con :: forall p. HsExpr p -> XRec p (ConLikeP p)
    rcon_con = XRec GhcPs (ConLikeP GhcPs)
    con_id
                      , rcon_flds :: forall p. HsExpr p -> HsRecordBinds p
    rcon_flds = rec_binds :: HsRecordBinds GhcPs
    rec_binds@(HsRecFields { rec_dotdot :: forall p arg. HsRecFields p arg -> Maybe (XRec p RecFieldsDotDot)
    rec_dotdot = Maybe (XRec GhcPs RecFieldsDotDot)
    dd }) })
      = do { con_lname@(L _ con_name) <- GenLocated SrcSpanAnnN RdrName
    -> TcRn (GenLocated SrcSpanAnnN Name)
    forall ann.
    GenLocated (EpAnn ann) RdrName
    -> TcRn (GenLocated (EpAnn ann) Name)
    lookupLocatedOccRnConstr XRec GhcPs (ConLikeP GhcPs)
    GenLocated SrcSpanAnnN RdrName
    con_id
           ; (flds, fvs)   <- rnHsRecFields (HsRecFieldCon con_name) mk_hs_var rec_binds
           ; (flds', fvss) <- mapAndUnzipM rn_field flds
           ; let rec_binds' = HsRecFields { rec_flds :: [LHsRecField GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    rec_flds = [LHsRecField GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    [GenLocated
       SrcSpanAnnA
       (HsFieldBind
          (GenLocated SrcSpanAnnA (FieldOcc GhcRn))
          (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    flds', rec_dotdot :: Maybe (XRec GhcRn RecFieldsDotDot)
    rec_dotdot = Maybe (XRec GhcPs RecFieldsDotDot)
    Maybe (XRec GhcRn RecFieldsDotDot)
    dd }
           ; return (RecordCon { rcon_ext = noExtField
                               , rcon_con = con_lname, rcon_flds = rec_binds' }
                    , fvs `plusFV` plusFVs fvss `addOneFV` con_name) }
      where
        mk_hs_var :: SrcSpan -> IdP p -> HsExpr p
    mk_hs_var SrcSpan
    l IdP p
    n = XVar p -> XRec p (IdP p) -> HsExpr p
    forall p. XVar p -> LIdP p -> HsExpr p
    HsVar XVar p
    NoExtField
    noExtField (l -> IdP p -> GenLocated l (IdP p)
    forall l e. l -> e -> GenLocated l e
    L (SrcSpan -> l
    forall e. HasAnnotation e => SrcSpan -> e
    noAnnSrcSpan SrcSpan
    l) IdP p
    n)
        rn_field :: GenLocated
      l (HsFieldBind lhs (GenLocated SrcSpanAnnA (HsExpr GhcPs)))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            l (HsFieldBind lhs (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    rn_field (L l
    l HsFieldBind lhs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    fld) = do { (arg', fvs) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr (HsFieldBind lhs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    -> GenLocated SrcSpanAnnA (HsExpr GhcPs)
    forall lhs rhs. HsFieldBind lhs rhs -> rhs
    hfbRHS HsFieldBind lhs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    fld)
                                ; return (L l (fld { hfbRHS = arg' }), fvs) }

    rnExpr (RecordUpd { rupd_expr :: forall p. HsExpr p -> LHsExpr p
    rupd_expr = L SrcSpanAnnA
    l HsExpr GhcPs
    expr, rupd_flds :: forall p. HsExpr p -> LHsRecUpdFields p
    rupd_flds = LHsRecUpdFields GhcPs
    rbinds })
      = SrcSpanAnnA
    -> TcM (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall ann a. EpAnn ann -> TcRn a -> TcRn a
    setSrcSpanA SrcSpanAnnA
    l (TcM (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars))
    -> TcM (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a b. (a -> b) -> a -> b
    $
        case LHsRecUpdFields GhcPs
    rbinds of

          -- 'OverloadedRecordUpdate' is not in effect. Regular record update.
          RegularRecUpdFields { recUpdFields :: forall p. LHsRecUpdFields p -> [LHsRecUpdField p p]
    recUpdFields = [LHsRecUpdField GhcPs GhcPs]
    flds } ->
            do  { (e, fv_e) <- HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnExpr HsExpr GhcPs
    expr
                ; (parents, flds, fv_flds) <- rnHsRecUpdFields flds
                ; let upd_flds =
                        RegularRecUpdFields
                        { xRecUpdFields :: XLHsRecUpdLabels GhcRn
    xRecUpdFields = NonEmpty (HsRecUpdParent GhcRn)
    XLHsRecUpdLabels GhcRn
    parents
                        , recUpdFields :: [LHsRecUpdField GhcRn GhcRn]
    recUpdFields  = [LHsRecUpdField GhcRn GhcRn]
    [GenLocated
       SrcSpanAnnA
       (HsFieldBind
          (GenLocated SrcSpanAnnA (AmbiguousFieldOcc GhcRn))
          (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    flds }
                ; return ( RecordUpd noExtField (L l e) upd_flds
                         , fv_e `plusFV` fv_flds ) }

          -- 'OverloadedRecordUpdate' is in effect. Record dot update desugaring.
          OverloadedRecUpdFields { olRecUpdFields :: forall p. LHsRecUpdFields p -> [LHsRecUpdProj p]
    olRecUpdFields = [LHsRecUpdProj GhcPs]
    flds } ->
            do { Extension
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall gbl lcl. Extension -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
    unlessXOptM Extension
    LangExt.RebindableSyntax (IOEnv (Env TcGblEnv TcLclEnv) ()
     -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a b. (a -> b) -> a -> b
    $
                   TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr TcRnMessage
    TcRnNoRebindableSyntaxRecordDot
               ; let punnedFields :: [HsFieldBind
       (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
       (GenLocated SrcSpanAnnA (HsExpr GhcPs))]
    punnedFields = [HsFieldBind
      (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
      (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    fld | (L SrcSpanAnnA
    _ HsFieldBind
      (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
      (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    fld) <- [LHsRecUpdProj GhcPs]
    [GenLocated
       SrcSpanAnnA
       (HsFieldBind
          (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
          (GenLocated SrcSpanAnnA (HsExpr GhcPs)))]
    flds, HsFieldBind
      (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
      (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    -> Bool
    forall lhs rhs. HsFieldBind lhs rhs -> Bool
    hfbPun HsFieldBind
      (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
      (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    fld]
               ; punsEnabled <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
    xoptM Extension
    LangExt.NamedFieldPuns
               ; unless (null punnedFields || punsEnabled) $
                   addErr TcRnNoFieldPunsRecordDot
               ; (getField, fv_getField) <- lookupSyntaxName getFieldName
               ; (setField, fv_setField) <- lookupSyntaxName setFieldName
               ; (e, fv_e) <- rnExpr expr
               ; (us, fv_us) <- rnHsUpdProjs flds
                ; let upd_flds = OverloadedRecUpdFields
                                { xOLRecUpdFields :: XLHsOLRecUpdLabels GhcRn
    xOLRecUpdFields = XLHsOLRecUpdLabels GhcRn
    NoExtField
    noExtField
                                , olRecUpdFields :: [LHsRecUpdProj GhcRn]
    olRecUpdFields  = [LHsRecUpdProj GhcRn]
    [GenLocated
       SrcSpanAnnA
       (HsFieldBind
          (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
          (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    us }
                ; return ( mkExpandedExpr
                             (RecordUpd noExtField (L l e) upd_flds)
                             (mkRecordDotUpd getField setField (L l e) us)
                            , plusFVs [fv_getField, fv_setField, fv_e, fv_us] ) }

    rnExpr (HsRecSel XRecSel GhcPs
    x FieldOcc GhcPs
    _) = DataConCantHappen -> TcM (HsExpr GhcRn, FreeVars)
    forall a. DataConCantHappen -> a
    dataConCantHappen XRecSel GhcPs
    DataConCantHappen
    x

    rnExpr (ExprWithTySig XExprWithTySig GhcPs
    _ LHsExpr GhcPs
    expr LHsSigWcType (NoGhcTc GhcPs)
    pty)
      = do  { (pty', fvTy)    <- HsDocContext
    -> LHsSigWcType GhcPs -> RnM (LHsSigWcType GhcRn, FreeVars)
    rnHsSigWcType HsDocContext
    ExprWithTySigCtx LHsSigWcType (NoGhcTc GhcPs)
    LHsSigWcType GhcPs
    pty
            ; (expr', fvExpr) <- bindSigTyVarsFV (hsWcScopedTvs pty') $
                                 rnLExpr expr
            ; return (ExprWithTySig noExtField expr' pty', fvExpr `plusFV` fvTy) }

    -- HsIf: see Note [Handling overloaded and rebindable constructs]
    -- Because of the coverage checker it is most convenient /not/ to
    -- expand HsIf; unless we are in rebindable syntax.
    rnExpr (HsIf XIf GhcPs
    _ LHsExpr GhcPs
    p LHsExpr GhcPs
    b1 LHsExpr GhcPs
    b2) = LHsExpr GhcPs
    -> LHsExpr GhcPs -> LHsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnHsIf LHsExpr GhcPs
    p LHsExpr GhcPs
    b1 LHsExpr GhcPs
    b2

    rnExpr (HsMultiIf XMultiIf GhcPs
    _ [LGRHS GhcPs (LHsExpr GhcPs)]
    alts)
      = do { (alts', fvs) <- (GenLocated
       (Anno (GRHS GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))))
       (GRHS GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs)))
     -> RnM
          (GenLocated
             (Anno (GRHS GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
             (GRHS GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars))
    -> [GenLocated
          (Anno (GRHS GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))))
          (GRHS GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs)))]
    -> RnM
         ([GenLocated
             (Anno (GRHS GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
             (GRHS GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
          FreeVars)
    forall (f :: * -> *) a b.
    Traversable f =>
    (a -> RnM (b, FreeVars)) -> f a -> RnM (f b, FreeVars)
    mapFvRn (HsMatchContextRn
    -> (GenLocated SrcSpanAnnA (HsExpr GhcPs)
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars))
    -> LGRHS GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    -> RnM
         (LGRHS GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)
    forall (body :: * -> *).
    AnnoBody body =>
    HsMatchContextRn
    -> (LocatedA (body GhcPs) -> RnM (LocatedA (body GhcRn), FreeVars))
    -> LGRHS GhcPs (LocatedA (body GhcPs))
    -> RnM (LGRHS GhcRn (LocatedA (body GhcRn)), FreeVars)
    rnGRHS HsMatchContextRn
    HsMatchContext (GenLocated SrcSpanAnnN Name)
    forall fn. HsMatchContext fn
    IfAlt LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    GenLocated SrcSpanAnnA (HsExpr GhcPs)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    rnLExpr) [LGRHS GhcPs (LHsExpr GhcPs)]
    [GenLocated
       (Anno (GRHS GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))))
       (GRHS GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs)))]
    alts
           ; return (HsMultiIf noExtField alts', fvs) }

    rnExpr (ArithSeq XArithSeq GhcPs
    _ Maybe (SyntaxExpr GhcPs)
    _ ArithSeqInfo GhcPs
    seq)
      = do { opt_OverloadedLists <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
    xoptM Extension
    LangExt.OverloadedLists
           ; (new_seq, fvs) <- rnArithSeq seq
           ; if opt_OverloadedLists
               then do {
                ; (from_list_name, fvs') <- lookupSyntax fromListName
                ; return (ArithSeq noExtField (Just from_list_name) new_seq
                         , fvs `plusFV` fvs') }
               else
                return (ArithSeq noExtField Nothing new_seq, fvs) }

    rnExpr (HsEmbTy XEmbTy GhcPs
    _ LHsWcType (NoGhcTc GhcPs)
    ty)
      = do { (ty', fvs) <- HsDocContext -> LHsWcType GhcPs -> RnM (LHsWcType GhcRn, FreeVars)
    rnHsWcType HsDocContext
    HsTypeCtx LHsWcType (NoGhcTc GhcPs)
    LHsWcType GhcPs
    ty
           ; return (HsEmbTy noExtField ty', fvs) }

    {-
    ************************************************************************
    *                                                                      *
            Static values
    *                                                                      *
    ************************************************************************

    For the static form we check that it is not used in splices.
    We also collect the free variables of the term which come from
    this module. See Note [Grand plan for static forms] in GHC.Iface.Tidy.StaticPtrTable.
    -}

    rnExpr e :: HsExpr GhcPs
    e@(HsStatic XStatic GhcPs
    _ LHsExpr GhcPs
    expr) = do
        -- Normally, you wouldn't be able to construct a static expression without
        -- first enabling -XStaticPointers in the first place, since that extension
        -- is what makes the parser treat `static` as a keyword. But this is not a
        -- sufficient safeguard, as one can construct static expressions by another
        -- mechanism: Template Haskell (see #14204). To ensure that GHC is
        -- absolutely prepared to cope with static forms, we check for
        -- -XStaticPointers here as well.
        Extension
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall gbl lcl. Extension -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
    unlessXOptM Extension
    LangExt.StaticPointers (IOEnv (Env TcGblEnv TcLclEnv) ()
     -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a b. (a -> b) -> a -> b
    $
          TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a b. (a -> b) -> a -> b
    $ HsExpr GhcPs -> TcRnMessage
    TcRnIllegalStaticExpression HsExpr GhcPs
    e
        (expr',fvExpr) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
        stage <- getStage
        case stage of
          Splice SpliceType
    _ -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a b. (a -> b) -> a -> b
    $ THError -> TcRnMessage
    TcRnTHError (THError -> TcRnMessage) -> THError -> TcRnMessage
    forall a b. (a -> b) -> a -> b
    $ HsExpr GhcPs -> THError
    IllegalStaticFormInSplice HsExpr GhcPs
    e
          ThStage
    _        -> () -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
        mod <- getModule
        let fvExpr' = (Name -> Bool) -> FreeVars -> FreeVars
    filterNameSet (Module -> Name -> Bool
    nameIsLocalOrFrom Module
    mod) FreeVars
    fvExpr
        return (HsStatic fvExpr' expr', fvExpr)

    {-
    ************************************************************************
    *                                                                      *
            Arrow notation
    *                                                                      *
    ********************************************************************* -}

    rnExpr (HsProc XProc GhcPs
    x LPat GhcPs
    pat LHsCmdTop GhcPs
    body)
      = TcM (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. TcM a -> TcM a
    newArrowScope (TcM (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars))
    -> TcM (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a b. (a -> b) -> a -> b
    $
        HsMatchContextRn
    -> LPat GhcPs
    -> (LPat GhcRn -> TcM (HsExpr GhcRn, FreeVars))
    -> TcM (HsExpr GhcRn, FreeVars)
    forall a.
    HsMatchContextRn
    -> LPat GhcPs
    -> (LPat GhcRn -> RnM (a, FreeVars))
    -> RnM (a, FreeVars)
    rnPat (HsArrowMatchContext -> HsMatchContext (GenLocated SrcSpanAnnN Name)
    forall fn. HsArrowMatchContext -> HsMatchContext fn
    ArrowMatchCtxt HsArrowMatchContext
    ProcExpr) LPat GhcPs
    pat ((LPat GhcRn -> TcM (HsExpr GhcRn, FreeVars))
     -> TcM (HsExpr GhcRn, FreeVars))
    -> (LPat GhcRn -> TcM (HsExpr GhcRn, FreeVars))
    -> TcM (HsExpr GhcRn, FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \ LPat GhcRn
    pat' -> do
          { (body',fvBody) <- LHsCmdTop GhcPs -> RnM (LHsCmdTop GhcRn, FreeVars)
    rnCmdTop LHsCmdTop GhcPs
    body
          ; return (HsProc x pat' body', fvBody) }

    {-
    ************************************************************************
    *                                                                      *
            Operator sections
    *                                                                      *
    ********************************************************************* -}

    rnSection :: HsExpr GhcPs -> RnM (HsExpr GhcRn, FreeVars)
    -- See Note [Parsing sections] in GHC.Parser
    -- Also see Note [Handling overloaded and rebindable constructs]

    rnSection :: HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnSection section :: HsExpr GhcPs
    section@(SectionR XSectionR GhcPs
    x LHsExpr GhcPs
    op LHsExpr GhcPs
    expr)
      -- See Note [Left and right sections]
      = do  { (op', fvs_op)     <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    op
            ; (expr', fvs_expr) <- rnLExpr expr
            ; checkSectionPrec InfixR section op' expr'
            ; let rn_section = XSectionR GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XSectionR p -> LHsExpr p -> LHsExpr p -> HsExpr p
    SectionR XSectionR GhcPs
    XSectionR GhcRn
    x XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    op' XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    expr'
                  ds_section = Name -> [XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn
    genHsApps Name
    rightSectionName [XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    op',XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    expr']
            ; return ( mkExpandedExpr rn_section ds_section
                     , fvs_op `plusFV` fvs_expr) }

    rnSection section :: HsExpr GhcPs
    section@(SectionL XSectionL GhcPs
    x LHsExpr GhcPs
    expr LHsExpr GhcPs
    op)
      -- See Note [Left and right sections]
      = do  { (expr', fvs_expr) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
            ; (op', fvs_op)     <- rnLExpr op
            ; checkSectionPrec InfixL section op' expr'
            ; postfix_ops <- xoptM LangExt.PostfixOperators
                            -- Note [Left and right sections]
            ; let rn_section = XSectionL GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XSectionL p -> LHsExpr p -> LHsExpr p -> HsExpr p
    SectionL XSectionL GhcPs
    XSectionL GhcRn
    x XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    expr' XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    op'
                  ds_section
                    | Bool
    postfix_ops = XApp GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XApp p -> LHsExpr p -> LHsExpr p -> HsExpr p
    HsApp XApp GhcRn
    NoExtField
    noExtField XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    op' XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    expr'
                    | Bool
    otherwise   = Name -> [XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn
    genHsApps Name
    leftSectionName
                                       [HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall an a. NoAnn an => a -> LocatedAn an a
    wrapGenSpan (HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall a b. (a -> b) -> a -> b
    $ XApp GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XApp p -> LHsExpr p -> LHsExpr p -> HsExpr p
    HsApp XApp GhcRn
    NoExtField
    noExtField XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    op' XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    expr']
            ; return ( mkExpandedExpr rn_section ds_section
                     , fvs_op `plusFV` fvs_expr) }

    rnSection HsExpr GhcPs
    other = String -> SDoc -> TcM (HsExpr GhcRn, FreeVars)
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rnSection" (HsExpr GhcPs -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr HsExpr GhcPs
    other)

    {- Note [Left and right sections]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Dealing with left sections (x *) and right sections (* x) is
    surprisingly fiddly.  We expand like this
         (`op` e) ==> rightSection op e
         (e `op`) ==> leftSection  (op e)

    Using an auxiliary function in this way avoids the awkwardness of
    generating a lambda, esp if `e` is a redex, so we *don't* want
    to generate `(\x -> op x e)`. See Historical
    Note [Desugaring operator sections]

    Here are their definitions:
       leftSection :: forall r1 r2 n (a::TYPE r1) (b::TYPE r2).
                      (a %n-> b) -> a %n-> b
       leftSection f x = f x

       rightSection :: forall r1 r2 r3 n1 n2 (a::TYPE r1) (b::TYPE r2) (c::TYPE r3).
                       (a %n1 -> b %n2-> c) -> b %n2-> a %n1-> c
       rightSection f y x = f x y

    Note the wrinkles:

    * We do /not/ use lookupSyntaxName, which would make left and right
      section fall under RebindableSyntax.  Reason: it would be a user-
      facing change, and there are some tricky design choices (#19354).
      Plus, infix operator applications would be trickier to make
      rebindable, so it'd be inconsistent to do so for sections.

      TL;DR: we still use the renamer-expansion mechanism for operator
      sections, but only to eliminate special-purpose code paths in the
      renamer and desugarer.

    * leftSection and rightSection must be representation-polymorphic, to allow
      (+# 4#) and (4# +#) to work. See
      Note [Wired-in Ids for rebindable syntax] in GHC.Types.Id.Make.

    * leftSection and rightSection must be multiplicity-polymorphic.
      (Test linear/should_compile/OldList showed this up.)

    * Because they are representation-polymorphic, we have to define them
      as wired-in Ids, with compulsory inlining.  See
      GHC.Types.Id.Make.leftSectionId, rightSectionId.

    * leftSection is just ($) really; but unlike ($) it is
      representation-polymorphic in the result type, so we can write
      `(x +#)`, say.

    * The type of leftSection must have an arrow in its first argument,
      because (x `ord`) should be rejected, because ord does not take two
      arguments

    * It's important that we define leftSection in an eta-expanded way,
      (i.e. not leftSection f = f), so that
          (True `undefined`) `seq` ()
          = (leftSection (undefined True) `seq` ())
      evaluates to () and not undefined

    * If PostfixOperators is ON, then we expand a left section like this:
          (e `op`)  ==>   op e
      with no auxiliary function at all.  Simple!

    * leftSection and rightSection switch on ImpredicativeTypes locally,
      during Quick Look; see GHC.Tc.Gen.App.wantQuickLook. Consider
      test DeepSubsumption08:
         type Setter st t a b = forall f. Identical f => blah
         (.~) :: Setter s t a b -> b -> s -> t
         clear :: Setter a a' b (Maybe b') -> a -> a'
         clear = (.~ Nothing)
       The expansion look like (rightSection (.~) Nothing).  So we must
       instantiate `rightSection` first type argument to a polytype!
       Hence the special magic in App.wantQuickLook.

    Historical Note [Desugaring operator sections]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    This Note explains some historical trickiness in desugaring left and
    right sections.  That trickiness has completely disappeared now that
    we desugar to calls to 'leftSection` and `rightSection`, but I'm
    leaving it here to remind us how nice the new story is.

    Desugaring left sections with -XPostfixOperators is straightforward: convert
    (expr `op`) to (op expr).

    Without -XPostfixOperators it's a bit more tricky. At first it looks as if we
    can convert

        (expr `op`)

    naively to

        \x -> op expr x

    But no!  expr might be a redex, and we can lose laziness badly this
    way.  Consider

        map (expr `op`) xs

    for example. If expr were a redex then eta-expanding naively would
    result in multiple evaluations where the user might only have expected one.

    So we convert instead to

        let y = expr in \x -> op y x

    Also, note that we must do this for both right and (perhaps surprisingly) left
    sections. Why are left sections necessary? Consider the program (found in #18151),

        seq (True `undefined`) ()

    according to the Haskell Report this should reduce to () (as it specifies
    desugaring via eta expansion). However, if we fail to eta expand we will rather
    bottom. Consequently, we must eta expand even in the case of a left section.

    If `expr` is actually just a variable, say, then the simplifier
    will inline `y`, eliminating the redundant `let`.

    Note that this works even in the case that `expr` is unlifted. In this case
    bindNonRec will automatically do the right thing, giving us:

        case expr of y -> (\x -> op y x)

    See #18151.

    Note [Reporting unbound names]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Faced with an out-of-scope `RdrName` there are two courses of action
    A. Report an error immediately (and return a HsUnboundVar). This will halt GHC after the renamer is complete
    B. Return a HsUnboundVar without reporting an error.  That will allow the typechecker to run, which in turn
       can give a better error message, notably giving the type of the variable via the "typed holes" mechanism.

    When `-fdefer-out-of-scope-variables` is on we follow plan B.

    When it is not, we follow plan B for unqualified names, and plan A for qualified names.

    If a name is qualified, and out of scope, then by default an error will be raised
    because the user was already more precise. They specified a specific qualification
    and either
      * The qualification didn't exist, so that precision was wrong.
      * Or the qualification existed and the thing we were looking for wasn't where
        the qualification said it would be.

    However we can still defer this error completely, and we do defer it if
    `-fdefer-out-of-scope-variables` is enabled.

    -}

    {-
    ************************************************************************
    *                                                                      *
            Field Labels
    *                                                                      *
    ************************************************************************
    -}

    rnDotFieldOcc :: LocatedAn NoEpAnns (DotFieldOcc GhcPs) -> LocatedAn NoEpAnns (DotFieldOcc GhcRn)
    rnDotFieldOcc :: LocatedAn NoEpAnns (DotFieldOcc GhcPs)
    -> LocatedAn NoEpAnns (DotFieldOcc GhcRn)
    rnDotFieldOcc (L EpAnn NoEpAnns
    l (DotFieldOcc XCDotFieldOcc GhcPs
    x XRec GhcPs FieldLabelString
    label)) = EpAnn NoEpAnns
    -> DotFieldOcc GhcRn -> LocatedAn NoEpAnns (DotFieldOcc GhcRn)
    forall l e. l -> e -> GenLocated l e
    L EpAnn NoEpAnns
    l (XCDotFieldOcc GhcRn
    -> XRec GhcRn FieldLabelString -> DotFieldOcc GhcRn
    forall p.
    XCDotFieldOcc p -> XRec p FieldLabelString -> DotFieldOcc p
    DotFieldOcc XCDotFieldOcc GhcPs
    XCDotFieldOcc GhcRn
    x XRec GhcPs FieldLabelString
    XRec GhcRn FieldLabelString
    label)

    rnFieldLabelStrings :: FieldLabelStrings GhcPs -> FieldLabelStrings GhcRn
    rnFieldLabelStrings :: FieldLabelStrings GhcPs -> FieldLabelStrings GhcRn
    rnFieldLabelStrings (FieldLabelStrings [XRec GhcPs (DotFieldOcc GhcPs)]
    fls) = [XRec GhcRn (DotFieldOcc GhcRn)] -> FieldLabelStrings GhcRn
    forall p. [XRec p (DotFieldOcc p)] -> FieldLabelStrings p
    FieldLabelStrings ((LocatedAn NoEpAnns (DotFieldOcc GhcPs)
     -> LocatedAn NoEpAnns (DotFieldOcc GhcRn))
    -> [LocatedAn NoEpAnns (DotFieldOcc GhcPs)]
    -> [LocatedAn NoEpAnns (DotFieldOcc GhcRn)]
    forall a b. (a -> b) -> [a] -> [b]
    map LocatedAn NoEpAnns (DotFieldOcc GhcPs)
    -> LocatedAn NoEpAnns (DotFieldOcc GhcRn)
    rnDotFieldOcc [XRec GhcPs (DotFieldOcc GhcPs)]
    [LocatedAn NoEpAnns (DotFieldOcc GhcPs)]
    fls)

    {-
    ************************************************************************
    *                                                                      *
            Arrow commands
    *                                                                      *
    ************************************************************************
    -}

    rnCmdArgs :: [LHsCmdTop GhcPs] -> RnM ([LHsCmdTop GhcRn], FreeVars)
    rnCmdArgs :: [LHsCmdTop GhcPs] -> RnM ([LHsCmdTop GhcRn], FreeVars)
    rnCmdArgs [] = ([GenLocated (EpAnn NoEpAnns) (HsCmdTop GhcRn)], FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated (EpAnn NoEpAnns) (HsCmdTop GhcRn)], FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([], FreeVars
    emptyFVs)
    rnCmdArgs (LHsCmdTop GhcPs
    arg:[LHsCmdTop GhcPs]
    args)
      = do { (arg',fvArg) <- LHsCmdTop GhcPs -> RnM (LHsCmdTop GhcRn, FreeVars)
    rnCmdTop LHsCmdTop GhcPs
    arg
           ; (args',fvArgs) <- rnCmdArgs args
           ; return (arg':args', fvArg `plusFV` fvArgs) }

    rnCmdTop :: LHsCmdTop GhcPs -> RnM (LHsCmdTop GhcRn, FreeVars)
    rnCmdTop :: LHsCmdTop GhcPs -> RnM (LHsCmdTop GhcRn, FreeVars)
    rnCmdTop = (HsCmdTop GhcPs -> TcM (HsCmdTop GhcRn, FreeVars))
    -> GenLocated (EpAnn NoEpAnns) (HsCmdTop GhcPs)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated (EpAnn NoEpAnns) (HsCmdTop GhcRn), FreeVars)
    forall a b c ann.
    (a -> TcM (b, c))
    -> GenLocated (EpAnn ann) a -> TcM (GenLocated (EpAnn ann) b, c)
    wrapLocFstMA HsCmdTop GhcPs -> TcM (HsCmdTop GhcRn, FreeVars)
    rnCmdTop'
     where
      rnCmdTop' :: HsCmdTop GhcPs -> RnM (HsCmdTop GhcRn, FreeVars)
      rnCmdTop' :: HsCmdTop GhcPs -> TcM (HsCmdTop GhcRn, FreeVars)
    rnCmdTop' (HsCmdTop XCmdTop GhcPs
    _ LHsCmd GhcPs
    cmd)
       = do { (cmd', fvCmd) <- LHsCmd GhcPs -> RnM (LHsCmd GhcRn, FreeVars)
    rnLCmd LHsCmd GhcPs
    cmd
            ; let cmd_names = [Name
    arrAName, Name
    composeAName, Name
    firstAName] [Name] -> [Name] -> [Name]
    forall a. [a] -> [a] -> [a]
    ++
                              FreeVars -> [Name]
    nameSetElemsStable (HsCmd GhcRn -> FreeVars
    methodNamesCmd (GenLocated SrcSpanAnnA (HsCmd GhcRn) -> HsCmd GhcRn
    forall l e. GenLocated l e -> e
    unLoc GenLocated SrcSpanAnnA (HsCmd GhcRn)
    cmd'))
            -- Generate the rebindable syntax for the monad
            ; (cmd_names', cmd_fvs) <- lookupSyntaxNames cmd_names

            ; return (HsCmdTop (cmd_names `zip` cmd_names') cmd',
                      fvCmd `plusFV` cmd_fvs) }

    rnLCmd :: LHsCmd GhcPs -> RnM (LHsCmd GhcRn, FreeVars)
    rnLCmd :: LHsCmd GhcPs -> RnM (LHsCmd GhcRn, FreeVars)
    rnLCmd = (HsCmd GhcPs -> TcM (HsCmd GhcRn, FreeVars))
    -> GenLocated SrcSpanAnnA (HsCmd GhcPs)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsCmd GhcRn), FreeVars)
    forall a b c ann.
    (a -> TcM (b, c))
    -> GenLocated (EpAnn ann) a -> TcM (GenLocated (EpAnn ann) b, c)
    wrapLocFstMA HsCmd GhcPs -> TcM (HsCmd GhcRn, FreeVars)
    rnCmd

    rnCmd :: HsCmd GhcPs -> RnM (HsCmd GhcRn, FreeVars)

    rnCmd :: HsCmd GhcPs -> TcM (HsCmd GhcRn, FreeVars)
    rnCmd (HsCmdArrApp XCmdArrApp GhcPs
    _ LHsExpr GhcPs
    arrow LHsExpr GhcPs
    arg HsArrAppType
    ho Bool
    rtl)
      = do { (arrow',fvArrow) <- IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    select_arrow_scope (LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    arrow)
           ; (arg',fvArg) <- rnLExpr arg
           ; return (HsCmdArrApp noExtField arrow' arg' ho rtl,
                     fvArrow `plusFV` fvArg) }
      where
        select_arrow_scope :: IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    select_arrow_scope IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    tc = case HsArrAppType
    ho of
            HsArrAppType
    HsHigherOrderApp -> IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    tc
            HsArrAppType
    HsFirstOrderApp  -> IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    forall a. TcM a -> TcM a
    escapeArrowScope IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    tc
            -- See Note [Escaping the arrow scope] in GHC.Tc.Types
            -- Before renaming 'arrow', use the environment of the enclosing
            -- proc for the (-<) case.
            -- Local bindings, inside the enclosing proc, are not in scope
            -- inside 'arrow'.  In the higher-order case (-<<), they are.

    -- infix form
    rnCmd (HsCmdArrForm XCmdArrForm GhcPs
    _ LHsExpr GhcPs
    op LexicalFixity
    _ (Just Fixity
    _) [LHsCmdTop GhcPs
    arg1, LHsCmdTop GhcPs
    arg2])
      = do { (op',fv_op) <- IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    forall a. TcM a -> TcM a
    escapeArrowScope (LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    op)
           ; let L _ (HsVar _ (L _ op_name)) = op'
           ; (arg1',fv_arg1) <- rnCmdTop arg1
           ; (arg2',fv_arg2) <- rnCmdTop arg2
            -- Deal with fixity
           ; fixity <- lookupFixityRn op_name
           ; final_e <- mkOpFormRn arg1' op' fixity arg2'
           ; return (final_e, fv_arg1 `plusFV` fv_op `plusFV` fv_arg2) }

    rnCmd (HsCmdArrForm XCmdArrForm GhcPs
    _ LHsExpr GhcPs
    op LexicalFixity
    f Maybe Fixity
    fixity [LHsCmdTop GhcPs]
    cmds)
      = do { (op',fvOp) <- IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    forall a. TcM a -> TcM a
    escapeArrowScope (LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    op)
           ; (cmds',fvCmds) <- rnCmdArgs cmds
           ; return ( HsCmdArrForm noExtField op' f fixity cmds'
                    , fvOp `plusFV` fvCmds) }

    rnCmd (HsCmdApp XCmdApp GhcPs
    x LHsCmd GhcPs
    fun LHsExpr GhcPs
    arg)
      = do { (fun',fvFun) <- LHsCmd GhcPs -> RnM (LHsCmd GhcRn, FreeVars)
    rnLCmd  LHsCmd GhcPs
    fun
           ; (arg',fvArg) <- rnLExpr arg
           ; return (HsCmdApp x fun' arg', fvFun `plusFV` fvArg) }

    rnCmd (HsCmdLam XCmdLamCase GhcPs
    x HsLamVariant
    lam_variant MatchGroup GhcPs (LHsCmd GhcPs)
    matches)
      = do { let ctxt :: HsMatchContext (GenLocated SrcSpanAnnN Name)
    ctxt = HsArrowMatchContext -> HsMatchContext (GenLocated SrcSpanAnnN Name)
    forall fn. HsArrowMatchContext -> HsMatchContext fn
    ArrowMatchCtxt (HsArrowMatchContext
     -> HsMatchContext (GenLocated SrcSpanAnnN Name))
    -> HsArrowMatchContext
    -> HsMatchContext (GenLocated SrcSpanAnnN Name)
    forall a b. (a -> b) -> a -> b
    $ HsLamVariant -> HsArrowMatchContext
    ArrowLamAlt HsLamVariant
    lam_variant
           ; (new_matches, ms_fvs) <- HsMatchContextRn
    -> (GenLocated SrcSpanAnnA (HsCmd GhcPs)
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (GenLocated SrcSpanAnnA (HsCmd GhcRn), FreeVars))
    -> MatchGroup GhcPs (GenLocated SrcSpanAnnA (HsCmd GhcPs))
    -> RnM
         (MatchGroup GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)), FreeVars)
    forall (body :: * -> *).
    (Outputable (body GhcPs), AnnoBody body) =>
    HsMatchContextRn
    -> (LocatedA (body GhcPs) -> RnM (LocatedA (body GhcRn), FreeVars))
    -> MatchGroup GhcPs (LocatedA (body GhcPs))
    -> RnM (MatchGroup GhcRn (LocatedA (body GhcRn)), FreeVars)
    rnMatchGroup HsMatchContextRn
    HsMatchContext (GenLocated SrcSpanAnnN Name)
    ctxt LHsCmd GhcPs -> RnM (LHsCmd GhcRn, FreeVars)
    GenLocated SrcSpanAnnA (HsCmd GhcPs)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsCmd GhcRn), FreeVars)
    rnLCmd MatchGroup GhcPs (LHsCmd GhcPs)
    MatchGroup GhcPs (GenLocated SrcSpanAnnA (HsCmd GhcPs))
    matches
           ; return (HsCmdLam x lam_variant new_matches, ms_fvs) }

    rnCmd (HsCmdPar XCmdPar GhcPs
    _ LHsCmd GhcPs
    e)
      = do  { (e', fvs_e) <- LHsCmd GhcPs -> RnM (LHsCmd GhcRn, FreeVars)
    rnLCmd LHsCmd GhcPs
    e
            ; return (HsCmdPar noExtField e', fvs_e) }

    rnCmd (HsCmdCase XCmdCase GhcPs
    _ LHsExpr GhcPs
    expr MatchGroup GhcPs (LHsCmd GhcPs)
    matches)
      = do { (new_expr, e_fvs) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
           ; (new_matches, ms_fvs) <- rnMatchGroup (ArrowMatchCtxt ArrowCaseAlt) rnLCmd matches
           ; return (HsCmdCase noExtField new_expr new_matches
                    , e_fvs `plusFV` ms_fvs) }

    rnCmd (HsCmdIf XCmdIf GhcPs
    _ SyntaxExpr GhcPs
    _ LHsExpr GhcPs
    p LHsCmd GhcPs
    b1 LHsCmd GhcPs
    b2)
      = do { (p', fvP) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    p
           ; (b1', fvB1) <- rnLCmd b1
           ; (b2', fvB2) <- rnLCmd b2

           ; mb_ite <- lookupIfThenElse
           ; let (ite, fvITE) = case mb_ite of
                    Just Name
    ite_name -> (Name -> SyntaxExprRn
    mkRnSyntaxExpr Name
    ite_name, Name -> FreeVars
    unitFV Name
    ite_name)
                    Maybe Name
    Nothing       -> (SyntaxExprRn
    NoSyntaxExprRn,          FreeVars
    emptyFVs)

           ; return (HsCmdIf noExtField ite p' b1' b2', plusFVs [fvITE, fvP, fvB1, fvB2])}

    rnCmd (HsCmdLet XCmdLet GhcPs
    _ HsLocalBinds GhcPs
    binds LHsCmd GhcPs
    cmd)
      = HsLocalBinds GhcPs
    -> (HsLocalBinds GhcRn -> FreeVars -> TcM (HsCmd GhcRn, FreeVars))
    -> TcM (HsCmd GhcRn, FreeVars)
    forall result.
    HsLocalBinds GhcPs
    -> (HsLocalBinds GhcRn -> FreeVars -> RnM (result, FreeVars))
    -> RnM (result, FreeVars)
    rnLocalBindsAndThen HsLocalBinds GhcPs
    binds ((HsLocalBinds GhcRn -> FreeVars -> TcM (HsCmd GhcRn, FreeVars))
     -> TcM (HsCmd GhcRn, FreeVars))
    -> (HsLocalBinds GhcRn -> FreeVars -> TcM (HsCmd GhcRn, FreeVars))
    -> TcM (HsCmd GhcRn, FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \ HsLocalBinds GhcRn
    binds' FreeVars
    _ -> do
          { (cmd',fvExpr) <- LHsCmd GhcPs -> RnM (LHsCmd GhcRn, FreeVars)
    rnLCmd LHsCmd GhcPs
    cmd
          ; return (HsCmdLet noExtField binds' cmd', fvExpr) }

    rnCmd (HsCmdDo XCmdDo GhcPs
    _ (L SrcSpanAnnL
    l [GenLocated
       SrcSpanAnnA
       (StmtLR GhcPs GhcPs (GenLocated SrcSpanAnnA (HsCmd GhcPs)))]
    stmts))
      = do  { ((stmts', _), fvs) <-
                HsStmtContextRn
    -> (HsCmd GhcPs -> TcM (HsCmd GhcRn, FreeVars))
    -> [LStmt GhcPs (GenLocated SrcSpanAnnA (HsCmd GhcPs))]
    -> ([Name] -> RnM ((), FreeVars))
    -> RnM
         (([LStmt GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn))], ()),
          FreeVars)
    forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM (([LStmt GhcRn (LocatedA (body GhcRn))], thing), FreeVars)
    rnStmts HsStmtContextRn
    HsStmtContext (GenLocated SrcSpanAnnN Name)
    forall fn. HsStmtContext fn
    ArrowExpr HsCmd GhcPs -> TcM (HsCmd GhcRn, FreeVars)
    rnCmd [LStmt GhcPs (GenLocated SrcSpanAnnA (HsCmd GhcPs))]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcPs GhcPs (GenLocated SrcSpanAnnA (HsCmd GhcPs)))]
    stmts (\ [Name]
    _ -> ((), FreeVars) -> RnM ((), FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ((), FreeVars
    emptyFVs))
            ; return ( HsCmdDo noExtField (L l stmts'), fvs ) }

    ---------------------------------------------------
    type CmdNeeds = FreeVars        -- Only inhabitants are
                                    --      appAName, choiceAName, loopAName

    -- find what methods the Cmd needs (loop, choice, apply)
    methodNamesLCmd :: LHsCmd GhcRn -> CmdNeeds
    methodNamesLCmd :: LHsCmd GhcRn -> FreeVars
    methodNamesLCmd = HsCmd GhcRn -> FreeVars
    methodNamesCmd (HsCmd GhcRn -> FreeVars)
    -> (GenLocated SrcSpanAnnA (HsCmd GhcRn) -> HsCmd GhcRn)
    -> GenLocated SrcSpanAnnA (HsCmd GhcRn)
    -> FreeVars
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . GenLocated SrcSpanAnnA (HsCmd GhcRn) -> HsCmd GhcRn
    forall l e. GenLocated l e -> e
    unLoc

    methodNamesCmd :: HsCmd GhcRn -> CmdNeeds

    methodNamesCmd :: HsCmd GhcRn -> FreeVars
    methodNamesCmd (HsCmdArrApp XCmdArrApp GhcRn
    _ XRec GhcRn (HsExpr GhcRn)
    _arrow XRec GhcRn (HsExpr GhcRn)
    _arg HsArrAppType
    HsFirstOrderApp Bool
    _rtl)
      = FreeVars
    emptyFVs
    methodNamesCmd (HsCmdArrApp XCmdArrApp GhcRn
    _ XRec GhcRn (HsExpr GhcRn)
    _arrow XRec GhcRn (HsExpr GhcRn)
    _arg HsArrAppType
    HsHigherOrderApp Bool
    _rtl)
      = Name -> FreeVars
    unitFV Name
    appAName
    methodNamesCmd (HsCmdArrForm {}) = FreeVars
    emptyFVs

    methodNamesCmd (HsCmdPar XCmdPar GhcRn
    _ LHsCmd GhcRn
    c) = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    c

    methodNamesCmd (HsCmdIf XCmdIf GhcRn
    _ SyntaxExpr GhcRn
    _ XRec GhcRn (HsExpr GhcRn)
    _ LHsCmd GhcRn
    c1 LHsCmd GhcRn
    c2)
      = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    c1 FreeVars -> FreeVars -> FreeVars
    `plusFV` LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    c2 FreeVars -> Name -> FreeVars
    `addOneFV` Name
    choiceAName

    methodNamesCmd (HsCmdLet XCmdLet GhcRn
    _ HsLocalBinds GhcRn
    _ LHsCmd GhcRn
    c)          = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    c
    methodNamesCmd (HsCmdDo XCmdDo GhcRn
    _ (L SrcSpanAnnL
    _ [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    stmts))   = [CmdLStmt GhcRn] -> FreeVars
    methodNamesStmts [CmdLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    stmts
    methodNamesCmd (HsCmdApp XCmdApp GhcRn
    _ LHsCmd GhcRn
    c XRec GhcRn (HsExpr GhcRn)
    _)          = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    c

    methodNamesCmd (HsCmdCase XCmdCase GhcRn
    _ XRec GhcRn (HsExpr GhcRn)
    _ MatchGroup GhcRn (LHsCmd GhcRn)
    matches)        = MatchGroup GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesMatch MatchGroup GhcRn (LHsCmd GhcRn)
    matches FreeVars -> Name -> FreeVars
    `addOneFV` Name
    choiceAName
    methodNamesCmd (HsCmdLam XCmdLamCase GhcRn
    _ HsLamVariant
    LamSingle MatchGroup GhcRn (LHsCmd GhcRn)
    matches) = MatchGroup GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesMatch MatchGroup GhcRn (LHsCmd GhcRn)
    matches
    methodNamesCmd (HsCmdLam XCmdLamCase GhcRn
    _ HsLamVariant
    _         MatchGroup GhcRn (LHsCmd GhcRn)
    matches) = MatchGroup GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesMatch MatchGroup GhcRn (LHsCmd GhcRn)
    matches FreeVars -> Name -> FreeVars
    `addOneFV` Name
    choiceAName

    --methodNamesCmd _ = emptyFVs
       -- Other forms can't occur in commands, but it's not convenient
       -- to error here so we just do what's convenient.
       -- The type checker will complain later

    ---------------------------------------------------
    methodNamesMatch :: MatchGroup GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesMatch :: MatchGroup GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesMatch (MG { mg_alts :: forall p body. MatchGroup p body -> XRec p [LMatch p body]
    mg_alts = L SrcSpanAnnL
    _ [GenLocated
       SrcSpanAnnA (Match GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    ms })
      = [FreeVars] -> FreeVars
    plusFVs ((GenLocated
       SrcSpanAnnA (Match GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
     -> FreeVars)
    -> [GenLocated
          SrcSpanAnnA (Match GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    -> [FreeVars]
    forall a b. (a -> b) -> [a] -> [b]
    map GenLocated
      SrcSpanAnnA (Match GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> FreeVars
    forall {l}.
    GenLocated l (Match GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> FreeVars
    do_one [GenLocated
       SrcSpanAnnA (Match GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    ms)
     where
        do_one :: GenLocated l (Match GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> FreeVars
    do_one (L l
    _ (Match { m_grhss :: forall p body. Match p body -> GRHSs p body
    m_grhss = GRHSs GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn))
    grhss })) = GRHSs GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesGRHSs GRHSs GhcRn (LHsCmd GhcRn)
    GRHSs GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn))
    grhss

    -------------------------------------------------
    -- gaw 2004
    methodNamesGRHSs :: GRHSs GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesGRHSs :: GRHSs GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesGRHSs (GRHSs XCGRHSs GhcRn (LHsCmd GhcRn)
    _ [LGRHS GhcRn (LHsCmd GhcRn)]
    grhss HsLocalBinds GhcRn
    _) = [FreeVars] -> FreeVars
    plusFVs ((LocatedAn
       NoEpAnns (GRHS GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
     -> FreeVars)
    -> [LocatedAn
          NoEpAnns (GRHS GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    -> [FreeVars]
    forall a b. (a -> b) -> [a] -> [b]
    map LocatedAn NoEpAnns (GRHS GhcRn (LHsCmd GhcRn)) -> FreeVars
    LocatedAn
      NoEpAnns (GRHS GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> FreeVars
    methodNamesGRHS [LGRHS GhcRn (LHsCmd GhcRn)]
    [LocatedAn
       NoEpAnns (GRHS GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    grhss)

    -------------------------------------------------

    methodNamesGRHS :: LocatedAn NoEpAnns (GRHS GhcRn (LHsCmd GhcRn)) -> CmdNeeds
    methodNamesGRHS :: LocatedAn NoEpAnns (GRHS GhcRn (LHsCmd GhcRn)) -> FreeVars
    methodNamesGRHS (L EpAnn NoEpAnns
    _ (GRHS XCGRHS GhcRn (LHsCmd GhcRn)
    _ [ExprLStmt GhcRn]
    _ LHsCmd GhcRn
    rhs)) = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    rhs

    ---------------------------------------------------
    methodNamesStmts :: [LStmtLR GhcRn GhcRn (LHsCmd GhcRn)] -> FreeVars
    methodNamesStmts :: [CmdLStmt GhcRn] -> FreeVars
    methodNamesStmts [CmdLStmt GhcRn]
    stmts = [FreeVars] -> FreeVars
    plusFVs ((GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
     -> FreeVars)
    -> [GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    -> [FreeVars]
    forall a b. (a -> b) -> [a] -> [b]
    map CmdLStmt GhcRn -> FreeVars
    GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> FreeVars
    methodNamesLStmt [CmdLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    stmts)

    ---------------------------------------------------
    methodNamesLStmt :: LStmtLR GhcRn GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesLStmt :: CmdLStmt GhcRn -> FreeVars
    methodNamesLStmt = StmtLR GhcRn GhcRn (LHsCmd GhcRn) -> FreeVars
    StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn))
    -> FreeVars
    methodNamesStmt (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn))
     -> FreeVars)
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
        -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> FreeVars
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn))
    forall l e. GenLocated l e -> e
    unLoc

    methodNamesStmt :: StmtLR GhcRn GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesStmt :: StmtLR GhcRn GhcRn (LHsCmd GhcRn) -> FreeVars
    methodNamesStmt (LastStmt XLastStmt GhcRn GhcRn (LHsCmd GhcRn)
    _ LHsCmd GhcRn
    cmd Maybe Bool
    _ SyntaxExpr GhcRn
    _)           = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    cmd
    methodNamesStmt (BodyStmt XBodyStmt GhcRn GhcRn (LHsCmd GhcRn)
    _ LHsCmd GhcRn
    cmd SyntaxExpr GhcRn
    _ SyntaxExpr GhcRn
    _)           = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    cmd
    methodNamesStmt (BindStmt XBindStmt GhcRn GhcRn (LHsCmd GhcRn)
    _ LPat GhcRn
    _ LHsCmd GhcRn
    cmd)             = LHsCmd GhcRn -> FreeVars
    methodNamesLCmd LHsCmd GhcRn
    cmd
    methodNamesStmt (RecStmt { recS_stmts :: forall idL idR body.
    StmtLR idL idR body -> XRec idR [LStmtLR idL idR body]
    recS_stmts = L SrcSpanAnnL
    _ [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    stmts }) =
      [CmdLStmt GhcRn] -> FreeVars
    methodNamesStmts [CmdLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsCmd GhcRn)))]
    stmts FreeVars -> Name -> FreeVars
    `addOneFV` Name
    loopAName
    methodNamesStmt (LetStmt {})                   = FreeVars
    emptyFVs
    methodNamesStmt (ParStmt {})                   = FreeVars
    emptyFVs
    methodNamesStmt (TransStmt {})                 = FreeVars
    emptyFVs
    methodNamesStmt ApplicativeStmt{}              = FreeVars
    emptyFVs
       -- ParStmt and TransStmt can't occur in commands, but it's not
       -- convenient to error here so we just do what's convenient

    {-
    ************************************************************************
    *                                                                      *
            Arithmetic sequences
    *                                                                      *
    ************************************************************************
    -}

    rnArithSeq :: ArithSeqInfo GhcPs -> RnM (ArithSeqInfo GhcRn, FreeVars)
    rnArithSeq :: ArithSeqInfo GhcPs -> RnM (ArithSeqInfo GhcRn, FreeVars)
    rnArithSeq (From LHsExpr GhcPs
    expr)
     = do { (expr', fvExpr) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr
          ; return (From expr', fvExpr) }

    rnArithSeq (FromThen LHsExpr GhcPs
    expr1 LHsExpr GhcPs
    expr2)
     = do { (expr1', fvExpr1) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr1
          ; (expr2', fvExpr2) <- rnLExpr expr2
          ; return (FromThen expr1' expr2', fvExpr1 `plusFV` fvExpr2) }

    rnArithSeq (FromTo LHsExpr GhcPs
    expr1 LHsExpr GhcPs
    expr2)
     = do { (expr1', fvExpr1) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr1
          ; (expr2', fvExpr2) <- rnLExpr expr2
          ; return (FromTo expr1' expr2', fvExpr1 `plusFV` fvExpr2) }

    rnArithSeq (FromThenTo LHsExpr GhcPs
    expr1 LHsExpr GhcPs
    expr2 LHsExpr GhcPs
    expr3)
     = do { (expr1', fvExpr1) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    expr1
          ; (expr2', fvExpr2) <- rnLExpr expr2
          ; (expr3', fvExpr3) <- rnLExpr expr3
          ; return (FromThenTo expr1' expr2' expr3',
                    plusFVs [fvExpr1, fvExpr2, fvExpr3]) }

    {-
    ************************************************************************
    *                                                                      *
    \subsubsection{@Stmt@s: in @do@ expressions}
    *                                                                      *
    ************************************************************************
    -}

    {-
    Note [Deterministic ApplicativeDo and RecursiveDo desugaring]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Both ApplicativeDo and RecursiveDo need to create tuples not
    present in the source text.

    For ApplicativeDo we create:

      (a,b,c) <- (\c b a -> (a,b,c)) <$>

    For RecursiveDo we create:

      mfix (\ ~(a,b,c) -> do ...; return (a',b',c'))

    The order of the components in those tuples needs to be stable
    across recompilations, otherwise they can get optimized differently
    and we end up with incompatible binaries.
    To get a stable order we use nameSetElemsStable.
    See Note [Deterministic UniqFM] to learn more about nondeterminism.
    -}

    type AnnoBody body
      = ( Outputable (body GhcPs)
        )

    -- | Rename some Stmts
    rnStmts :: AnnoBody body
            => HsStmtContextRn
            -> (body GhcPs -> RnM (body GhcRn, FreeVars))
               -- ^ How to rename the body of each statement (e.g. rnLExpr)
            -> [LStmt GhcPs (LocatedA (body GhcPs))]
               -- ^ Statements
            -> ([Name] -> RnM (thing, FreeVars))
               -- ^ if these statements scope over something, this renames it
               -- and returns the result.
            -> RnM (([LStmt GhcRn (LocatedA (body GhcRn))], thing), FreeVars)
    rnStmts :: forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM (([LStmt GhcRn (LocatedA (body GhcRn))], thing), FreeVars)
    rnStmts HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [LStmt GhcPs (LocatedA (body GhcPs))]
    stmts [Name] -> RnM (thing, FreeVars)
    thing_inside
     = do { ((stmts', thing), fvs) <- HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing),
          FreeVars)
    rnStmtsWithFreeVars HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [LStmt GhcPs (LocatedA (body GhcPs))]
    stmts [Name] -> RnM (thing, FreeVars)
    thing_inside
          ; return ((map fst stmts', thing), fvs) }

    -- | maybe rearrange statements according to the ApplicativeDo transformation
    postProcessStmtsForApplicativeDo
      :: HsDoFlavour
      -> [(ExprLStmt GhcRn, FreeVars)]
      -> RnM ([ExprLStmt GhcRn], FreeVars)
    postProcessStmtsForApplicativeDo :: HsDoFlavour
    -> [(ExprLStmt GhcRn, FreeVars)]
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    postProcessStmtsForApplicativeDo HsDoFlavour
    ctxt [(ExprLStmt GhcRn, FreeVars)]
    stmts
      = do {
           -- rearrange the statements using ApplicativeStmt if
           -- -XApplicativeDo is on.  Also strip out the FreeVars attached
           -- to each Stmt body.
             ado_is_on <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
    xoptM Extension
    LangExt.ApplicativeDo
           ; let is_do_expr | DoExpr{} <- HsDoFlavour
    ctxt = Bool
    True
                            | Bool
    otherwise = Bool
    False
           -- don't apply the transformation inside TH brackets, because
           -- GHC.HsToCore.Quote does not handle ApplicativeDo.
           ; in_th_bracket <- isBrackStage <$> getStage
           ; if ado_is_on && is_do_expr && not in_th_bracket
                then do { traceRn "ppsfa" (ppr stmts)
                        ; rearrangeForApplicativeDo ctxt stmts }
                else noPostProcessStmts (HsDoStmt ctxt) stmts }

    -- | strip the FreeVars annotations from statements
    noPostProcessStmts
      :: HsStmtContextRn
      -> [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
      -> RnM ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    noPostProcessStmts :: forall (body :: * -> *).
    HsStmtContextRn
    -> [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
    -> RnM ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    noPostProcessStmts HsStmtContextRn
    _ [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
    stmts = ([GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn)))],
     FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn)))],
          FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (((GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
      FreeVars)
     -> GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))
    -> [(GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
         FreeVars)]
    -> [GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn)))]
    forall a b. (a -> b) -> [a] -> [b]
    map (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
     FreeVars)
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn)))
    forall a b. (a, b) -> a
    fst [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
      FreeVars)]
    stmts, FreeVars
    emptyNameSet)

    rnStmtsWithFreeVars :: AnnoBody body
            => HsStmtContextRn
            -> ((body GhcPs) -> RnM ((body GhcRn), FreeVars))
            -> [LStmt GhcPs (LocatedA (body GhcPs))]
            -> ([Name] -> RnM (thing, FreeVars))
            -> RnM ( ([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing)
                   , FreeVars)
    -- Each Stmt body is annotated with its FreeVars, so that
    -- we can rearrange statements for ApplicativeDo.
    --
    -- Variables bound by the Stmts, and mentioned in thing_inside,
    -- do not appear in the result FreeVars

    rnStmtsWithFreeVars :: forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing),
          FreeVars)
    rnStmtsWithFreeVars HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [] [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do { HsStmtContextRn -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkEmptyStmts HsStmtContextRn
    ctxt
           ; (thing, fvs) <- [Name] -> RnM (thing, FreeVars)
    thing_inside []
           ; return (([], thing), fvs) }

    rnStmtsWithFreeVars mDoExpr :: HsStmtContextRn
    mDoExpr@(HsDoStmt MDoExpr{}) body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody ([LStmt GhcPs (LocatedA (body GhcPs))]
    -> Maybe
         (NonEmpty
            (GenLocated
               SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))))
    [GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    -> Maybe
         (NonEmpty
            (GenLocated
               SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))))
    forall a. [a] -> Maybe (NonEmpty a)
    nonEmpty -> Just NonEmpty
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    stmts) [Name] -> RnM (thing, FreeVars)
    thing_inside    -- Deal with mdo
      = -- Behave like do { rec { ...all but last... }; last }
        do { ((stmts1, (stmts2, thing)), fvs)
               <- HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> ([Name]
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (([(GenLocated
                   SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
                 FreeVars)],
               thing),
              FreeVars))
    -> RnM
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing),
          FreeVars)
    rnStmt HsStmtContextRn
    mDoExpr body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    forall e a. HasAnnotation e => a -> GenLocated e a
    noLocA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
     -> GenLocated
          SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    -> StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    forall a b. (a -> b) -> a -> b
    $ AnnList
    -> LocatedL [LStmt GhcPs (LocatedA (body GhcPs))]
    -> StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    forall (idL :: Pass) bodyR.
    (Anno
       [GenLocated
          (Anno (StmtLR (GhcPass idL) GhcPs bodyR))
          (StmtLR (GhcPass idL) GhcPs bodyR)]
     ~ SrcSpanAnnL) =>
    AnnList
    -> LocatedL [LStmtLR (GhcPass idL) GhcPs bodyR]
    -> StmtLR (GhcPass idL) GhcPs bodyR
    mkRecStmt AnnList
    forall a. NoAnn a => a
    noAnn ([GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    -> GenLocated
         SrcSpanAnnL
         [GenLocated
            SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    forall e a. HasAnnotation e => a -> GenLocated e a
    noLocA (NonEmpty
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    -> [GenLocated
          SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    forall a. NonEmpty a -> [a]
    NE.init NonEmpty
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    stmts))) (([Name]
      -> IOEnv
           (Env TcGblEnv TcLclEnv)
           (([(GenLocated
                 SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
               FreeVars)],
             thing),
            FreeVars))
     -> RnM
          (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            ([(GenLocated
                 SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
               FreeVars)],
             thing)),
           FreeVars))
    -> ([Name]
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (([(GenLocated
                   SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
                 FreeVars)],
               thing),
              FreeVars))
    -> RnM
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \ [Name]
    _ ->
                  do { last_stmt' <- HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    checkLastStmt HsStmtContextRn
    mDoExpr (NonEmpty
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    forall a. NonEmpty a -> a
    NE.last NonEmpty
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    stmts)
                     ; rnStmt mDoExpr rnBody last_stmt' thing_inside }
            ; return (((stmts1 ++ stmts2), thing), fvs) }

    rnStmtsWithFreeVars HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody (lstmt :: LStmt GhcPs (LocatedA (body GhcPs))
    lstmt@(L SrcSpanAnnA
    loc StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    _) : [LStmt GhcPs (LocatedA (body GhcPs))]
    lstmts) [Name] -> RnM (thing, FreeVars)
    thing_inside
      | [GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [LStmt GhcPs (LocatedA (body GhcPs))]
    [GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    lstmts
      = SrcSpanAnnA
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall ann a. EpAnn ann -> TcRn a -> TcRn a
    setSrcSpanA SrcSpanAnnA
    loc (IOEnv
       (Env TcGblEnv TcLclEnv)
       (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
           FreeVars)],
         thing),
        FreeVars)
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing),
           FreeVars))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall a b. (a -> b) -> a -> b
    $
        do { lstmt' <- HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    checkLastStmt HsStmtContextRn
    ctxt LStmt GhcPs (LocatedA (body GhcPs))
    lstmt
           ; rnStmt ctxt rnBody lstmt' thing_inside }

      | Bool
    otherwise
      = do { ((stmts1, (stmts2, thing)), fvs)
                <- SrcSpanAnnA
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(GenLocated
               SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(GenLocated
               SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    forall ann a. EpAnn ann -> TcRn a -> TcRn a
    setSrcSpanA SrcSpanAnnA
    loc                  (IOEnv
       (Env TcGblEnv TcLclEnv)
       (([(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
           FreeVars)],
         ([(GenLocated
              SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
            FreeVars)],
          thing)),
        FreeVars)
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          (([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            ([(GenLocated
                 SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
               FreeVars)],
             thing)),
           FreeVars))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(GenLocated
               SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(GenLocated
               SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    forall a b. (a -> b) -> a -> b
    $
                   do { HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkStmt HsStmtContextRn
    ctxt LStmt GhcPs (LocatedA (body GhcPs))
    lstmt
                      ; HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> ([Name]
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (([(GenLocated
                   SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
                 FreeVars)],
               thing),
              FreeVars))
    -> RnM
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing),
          FreeVars)
    rnStmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody LStmt GhcPs (LocatedA (body GhcPs))
    lstmt (([Name]
      -> IOEnv
           (Env TcGblEnv TcLclEnv)
           (([(GenLocated
                 SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
               FreeVars)],
             thing),
            FreeVars))
     -> RnM
          (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            ([(GenLocated
                 SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
               FreeVars)],
             thing)),
           FreeVars))
    -> ([Name]
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (([(GenLocated
                   SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
                 FreeVars)],
               thing),
              FreeVars))
    -> RnM
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           ([(GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing)),
          FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \ [Name]
    bndrs1 ->
                        HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing),
          FreeVars)
    rnStmtsWithFreeVars HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [LStmt GhcPs (LocatedA (body GhcPs))]
    lstmts  (([Name] -> RnM (thing, FreeVars))
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing),
           FreeVars))
    -> ([Name] -> RnM (thing, FreeVars))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \ [Name]
    bndrs2 ->
                        [Name] -> RnM (thing, FreeVars)
    thing_inside ([Name]
    bndrs1 [Name] -> [Name] -> [Name]
    forall a. [a] -> [a] -> [a]
    ++ [Name]
    bndrs2) }
            ; return (((stmts1 ++ stmts2), thing), fvs) }

    ----------------------

    {-
    Note [Failing pattern matches in Stmts]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Many things desugar to HsStmts including monadic things like `do` and `mdo`
    statements, pattern guards, and list comprehensions (see 'HsStmtContext' for an
    exhaustive list). How we deal with pattern match failure is context-dependent.

     * In the case of list comprehensions and pattern guards we don't need any
       'fail' function; the desugarer ignores the fail function of 'BindStmt'
       entirely. So, for list comprehensions, the fail function is set to 'Nothing'
       for clarity.

    * In the case of monadic contexts (e.g. monad comprehensions, do, and mdo
       expressions) we want pattern match failure to be desugared to the
       'fail' function (from MonadFail type class).

    At one point we failed to make this distinction, leading to #11216.
    -}

    rnStmt :: AnnoBody body
           => HsStmtContextRn
           -> (body GhcPs -> RnM (body GhcRn, FreeVars))
              -- ^ How to rename the body of the statement
           -> LStmt GhcPs (LocatedA (body GhcPs))
              -- ^ The statement
           -> ([Name] -> RnM (thing, FreeVars))
              -- ^ Rename the stuff that this statement scopes over
           -> RnM ( ([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing)
                  , FreeVars)
    -- Variables bound by the Stmt, and mentioned in thing_inside,
    -- do not appear in the result FreeVars

    rnStmt :: forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM
         (([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)], thing),
          FreeVars)
    rnStmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody (L SrcSpanAnnA
    loc (LastStmt XLastStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ (L SrcSpanAnnA
    lb body GhcPs
    body) Maybe Bool
    noret SyntaxExpr GhcPs
    _)) [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do  { (body', fv_expr) <- body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody body GhcPs
    body
            ; (ret_op, fvs1) <- if isMonadCompContext ctxt
                                then lookupStmtName ctxt returnMName
                                else return (noSyntaxExpr, emptyFVs)
                                -- The 'return' in a LastStmt is used only
                                -- for MonadComp; and we don't want to report
                                -- "not in scope: return" in other cases
                                -- #15607

            ; (thing,  fvs3) <- thing_inside []
            ; return (([(L loc (LastStmt noExtField (L lb body') noret ret_op), fv_expr)]
                      , thing), fv_expr `plusFV` fvs1 `plusFV` fvs3) }

    rnStmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody (L SrcSpanAnnA
    loc (BodyStmt XBodyStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ (L SrcSpanAnnA
    lb body GhcPs
    body) SyntaxExpr GhcPs
    _ SyntaxExpr GhcPs
    _)) [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do  { (body', fv_expr) <- body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody body GhcPs
    body
            ; (then_op, fvs1)  <- lookupQualifiedDoStmtName ctxt thenMName

            ; (guard_op, fvs2) <- if isComprehensionContext ctxt
                                  then lookupStmtName ctxt guardMName
                                  else return (noSyntaxExpr, emptyFVs)
                                  -- Only list/monad comprehensions use 'guard'
                                  -- Also for sub-stmts of same eg [ e | x<-xs, gd | blah ]
                                  -- Here "gd" is a guard

            ; (thing, fvs3)    <- thing_inside []
            ; return ( ([(L loc (BodyStmt noExtField (L lb body') then_op guard_op), fv_expr)]
                      , thing), fv_expr `plusFV` fvs1 `plusFV` fvs2 `plusFV` fvs3) }

    rnStmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody (L SrcSpanAnnA
    loc (BindStmt XBindStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ LPat GhcPs
    pat (L SrcSpanAnnA
    lb body GhcPs
    body))) [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do  { (body', fv_expr) <- body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody body GhcPs
    body
                    -- The binders do not scope over the expression
            ; (bind_op, fvs1) <- lookupQualifiedDoStmtName ctxt bindMName

            ; (fail_op, fvs2) <- monadFailOp pat ctxt

            ; rnPat (StmtCtxt ctxt) pat $ \ LPat GhcRn
    pat' -> do
            { (thing, fvs3) <- [Name] -> RnM (thing, FreeVars)
    thing_inside (CollectFlag GhcRn -> LPat GhcRn -> [IdP GhcRn]
    forall p. CollectPass p => CollectFlag p -> LPat p -> [IdP p]
    collectPatBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders LPat GhcRn
    pat')
            ; let xbsrn = XBindStmtRn { xbsrn_bindOp :: SyntaxExpr GhcRn
    xbsrn_bindOp = SyntaxExpr GhcRn
    SyntaxExprRn
    bind_op, xbsrn_failOp :: Maybe (SyntaxExpr GhcRn)
    xbsrn_failOp = Maybe (SyntaxExpr GhcRn)
    Maybe SyntaxExprRn
    fail_op }
            ; return (( [( L loc (BindStmt xbsrn pat' (L lb body')), fv_expr )]
                      , thing),
                      fv_expr `plusFV` fvs1 `plusFV` fvs2 `plusFV` fvs3) }}
           -- fv_expr shouldn't really be filtered by the rnPatsAndThen
            -- but it does not matter because the names are unique

    rnStmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ (L SrcSpanAnnA
    loc (LetStmt XLetStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ HsLocalBinds GhcPs
    binds)) [Name] -> RnM (thing, FreeVars)
    thing_inside
      =     HsLocalBinds GhcPs
    -> (HsLocalBinds GhcRn
        -> FreeVars
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
                 FreeVars)],
               thing),
              FreeVars))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall result.
    HsLocalBinds GhcPs
    -> (HsLocalBinds GhcRn -> FreeVars -> RnM (result, FreeVars))
    -> RnM (result, FreeVars)
    rnLocalBindsAndThen HsLocalBinds GhcPs
    binds ((HsLocalBinds GhcRn
      -> FreeVars
      -> IOEnv
           (Env TcGblEnv TcLclEnv)
           (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
               FreeVars)],
             thing),
            FreeVars))
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
              FreeVars)],
            thing),
           FreeVars))
    -> (HsLocalBinds GhcRn
        -> FreeVars
        -> IOEnv
             (Env TcGblEnv TcLclEnv)
             (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
                 FreeVars)],
               thing),
              FreeVars))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \HsLocalBinds GhcRn
    binds' FreeVars
    bind_fvs -> do
            { (thing, fvs) <- [Name] -> RnM (thing, FreeVars)
    thing_inside (CollectFlag GhcRn -> HsLocalBinds GhcRn -> [IdP GhcRn]
    forall (idL :: Pass) (idR :: Pass).
    CollectPass (GhcPass idL) =>
    CollectFlag (GhcPass idL)
    -> HsLocalBindsLR (GhcPass idL) (GhcPass idR)
    -> [IdP (GhcPass idL)]
    collectLocalBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders HsLocalBinds GhcRn
    binds')
            ; return ( ([(L loc (LetStmt noAnn binds'), bind_fvs)], thing)
                     , fvs) }

    rnStmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody (L SrcSpanAnnA
    loc (RecStmt { recS_stmts :: forall idL idR body.
    StmtLR idL idR body -> XRec idR [LStmtLR idL idR body]
    recS_stmts = L SrcSpanAnnL
    _ [GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    rec_stmts })) [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do  { (return_op, fvs1)  <- HsStmtContextRn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    lookupQualifiedDoStmtName HsStmtContextRn
    ctxt Name
    returnMName
            ; (mfix_op,   fvs2)  <- lookupQualifiedDoStmtName ctxt mfixName
            ; (bind_op,   fvs3)  <- lookupQualifiedDoStmtName ctxt bindMName
            ; let empty_rec_stmt = (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))
    forall bodyR.
    (Anno
       [GenLocated
          (Anno (StmtLR GhcRn GhcRn bodyR)) (StmtLR GhcRn GhcRn bodyR)]
     ~ SrcSpanAnnL) =>
    StmtLR GhcRn GhcRn bodyR
    forall {body :: * -> *}. StmtLR GhcRn GhcRn (LocatedA (body GhcRn))
    emptyRecStmtName :: StmtLR GhcRn GhcRn (LocatedA (body GhcRn)))
                                    { recS_ret_fn  = return_op
                                    , recS_mfix_fn = mfix_op
                                    , recS_bind_fn = bind_op }

            -- Step1: Bring all the binders of the mdo into scope
            -- (Remember that this also removes the binders from the
            -- finally-returned free-vars.)
            -- And rename each individual stmt, making a
            -- singleton segment.  At this stage the FwdRefs field
            -- isn't finished: it's empty for all except a BindStmt
            -- for which it's the fwd refs within the bind itself
            -- (This set may not be empty, because we're in a recursive
            -- context.)
            ; rnRecStmtsAndThen ctxt rnBody rec_stmts   $ \ [Segment (XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    segs -> do
            { let bndrs :: [Name]
    bndrs = FreeVars -> [Name]
    nameSetElemsStable (FreeVars -> [Name]) -> FreeVars -> [Name]
    forall a b. (a -> b) -> a -> b
    $
                            ((FreeVars, FreeVars, FreeVars,
      GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))
     -> FreeVars -> FreeVars)
    -> FreeVars
    -> [(FreeVars, FreeVars, FreeVars,
         GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    -> FreeVars
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr (FreeVars -> FreeVars -> FreeVars
    unionNameSet (FreeVars -> FreeVars -> FreeVars)
    -> ((FreeVars, FreeVars, FreeVars,
         GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))
        -> FreeVars)
    -> (FreeVars, FreeVars, FreeVars,
        GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))
    -> FreeVars
    -> FreeVars
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (\(FreeVars
    ds,FreeVars
    _,FreeVars
    _,GenLocated SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn)))
    _) -> FreeVars
    ds))
                                  FreeVars
    emptyNameSet
                                  [Segment (XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    [(FreeVars, FreeVars, FreeVars,
      GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    segs
              -- See Note [Deterministic ApplicativeDo and RecursiveDo desugaring]
            ; (thing, fvs_later) <- [Name] -> RnM (thing, FreeVars)
    thing_inside [Name]
    bndrs
            -- In interactive mode, all variables could be used later. So we pass whether
            -- we are in GHCi along to segmentRecStmts. See Note [What is "used later" in a rec stmt]
            ; is_interactive <- isInteractiveModule . tcg_mod <$> getGblEnv
            ; let
                 (rec_stmts', fvs) = segmentRecStmts (locA loc) ctxt empty_rec_stmt segs (fvs_later, is_interactive)
            -- We aren't going to try to group RecStmts with
            -- ApplicativeDo, so attaching empty FVs is fine.
            ; return ( ((zip rec_stmts' (repeat emptyNameSet)), thing)
                     , fvs `plusFV` fvs1 `plusFV` fvs2 `plusFV` fvs3) } }

    rnStmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    _ (L SrcSpanAnnA
    loc (ParStmt XParStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ [ParStmtBlock GhcPs GhcPs]
    segs HsExpr GhcPs
    _ SyntaxExpr GhcPs
    _)) [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do  { (mzip_op, fvs1)   <- HsStmtContextRn -> Name -> TcM (HsExpr GhcRn, FreeVars)
    lookupStmtNamePoly HsStmtContextRn
    ctxt Name
    mzipName
            ; (bind_op, fvs2)   <- lookupStmtName ctxt bindMName
            ; (return_op, fvs3) <- lookupStmtName ctxt returnMName
            ; ((segs', thing), fvs4) <- rnParallelStmts (ParStmtCtxt ctxt) return_op segs thing_inside
            ; return (([(L loc (ParStmt noExtField segs' mzip_op bind_op), fvs4)], thing)
                     , fvs1 `plusFV` fvs2 `plusFV` fvs3 `plusFV` fvs4) }

    rnStmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    _ (L SrcSpanAnnA
    loc (TransStmt { trS_stmts :: forall idL idR body. StmtLR idL idR body -> [ExprLStmt idL]
    trS_stmts = [ExprLStmt GhcPs]
    stmts, trS_by :: forall idL idR body. StmtLR idL idR body -> Maybe (LHsExpr idR)
    trS_by = Maybe (LHsExpr GhcPs)
    by, trS_form :: forall idL idR body. StmtLR idL idR body -> TransForm
    trS_form = TransForm
    form
                                  , trS_using :: forall idL idR body. StmtLR idL idR body -> LHsExpr idR
    trS_using = LHsExpr GhcPs
    using })) [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do { -- Rename the 'using' expression in the context before the transform is begun
             (using', fvs1) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    using

             -- Rename the stmts and the 'by' expression
             -- Keep track of the variables mentioned in the 'by' expression
           ; ((stmts', (by', used_bndrs, thing)), fvs2)
                 <- rnStmts (TransStmtCtxt ctxt) rnExpr stmts $ \ [Name]
    bndrs ->
                    do { (by',   fvs_by) <- (GenLocated SrcSpanAnnA (HsExpr GhcPs)
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars))
    -> Maybe (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    -> RnM (Maybe (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)
    forall a b.
    (a -> RnM (b, FreeVars)) -> Maybe a -> RnM (Maybe b, FreeVars)
    mapMaybeFvRn LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    GenLocated SrcSpanAnnA (HsExpr GhcPs)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated SrcSpanAnnA (HsExpr GhcRn), FreeVars)
    rnLExpr Maybe (LHsExpr GhcPs)
    Maybe (GenLocated SrcSpanAnnA (HsExpr GhcPs))
    by
                       ; (thing, fvs_thing) <- thing_inside bndrs
                       ; let fvs = FreeVars
    fvs_by FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs_thing
                             used_bndrs = (Name -> Bool) -> [Name] -> [Name]
    forall a. (a -> Bool) -> [a] -> [a]
    filter (Name -> FreeVars -> Bool
    `elemNameSet` FreeVars
    fvs) [Name]
    bndrs
                             -- The paper (Fig 5) has a bug here; we must treat any free variable
                             -- of the "thing inside", **or of the by-expression**, as used
                       ; return ((by', used_bndrs, thing), fvs) }

           -- Lookup `return`, `(>>=)` and `liftM` for monad comprehensions
           ; (return_op, fvs3) <- lookupStmtName ctxt returnMName
           ; (bind_op,   fvs4) <- lookupStmtName ctxt bindMName
           ; (fmap_op,   fvs5) <- case form of
                                    TransForm
    ThenForm -> (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (HsExpr GhcRn
    forall (p :: Pass). HsExpr (GhcPass p)
    noExpr, FreeVars
    emptyFVs)
                                    TransForm
    _        -> HsStmtContextRn -> Name -> TcM (HsExpr GhcRn, FreeVars)
    lookupStmtNamePoly HsStmtContextRn
    ctxt Name
    fmapName

           ; let all_fvs  = FreeVars
    fvs1 FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs2 FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs3
                                 FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs4 FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs5
                 bndr_map = [Name]
    used_bndrs [Name] -> [Name] -> [(Name, Name)]
    forall a b. [a] -> [b] -> [(a, b)]
    `zip` [Name]
    used_bndrs
                 -- See Note [TransStmt binder map] in GHC.Hs.Expr

           ; traceRn "rnStmt: implicitly rebound these used binders:" (ppr bndr_map)
           ; return (([(L loc (TransStmt { trS_ext = noExtField
                                        , trS_stmts = stmts', trS_bndrs = bndr_map
                                        , trS_by = by', trS_using = using', trS_form = form
                                        , trS_ret = return_op, trS_bind = bind_op
                                        , trS_fmap = fmap_op }), fvs2)], thing), all_fvs) }

    rnStmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ (L SrcSpanAnnA
    _ ApplicativeStmt{}) [Name] -> RnM (thing, FreeVars)
    _ =
      String
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (([(GenLocated
               SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
             FreeVars)],
           thing),
          FreeVars)
    forall a. HasCallStack => String -> a
    panic String
    "rnStmt: ApplicativeStmt"

    rnParallelStmts :: forall thing. HsStmtContextRn
                    -> SyntaxExpr GhcRn
                    -> [ParStmtBlock GhcPs GhcPs]
                    -> ([Name] -> RnM (thing, FreeVars))
                    -> RnM (([ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    -- Note [Renaming parallel Stmts]
    rnParallelStmts :: forall thing.
    HsStmtContextRn
    -> SyntaxExpr GhcRn
    -> [ParStmtBlock GhcPs GhcPs]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM (([ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    rnParallelStmts HsStmtContextRn
    ctxt SyntaxExpr GhcRn
    return_op [ParStmtBlock GhcPs GhcPs]
    segs [Name] -> RnM (thing, FreeVars)
    thing_inside
      = do { orig_lcl_env <- RnM LocalRdrEnv
    getLocalRdrEnv
           ; rn_segs orig_lcl_env [] segs }
      where
        rn_segs :: LocalRdrEnv
                -> [Name] -> [ParStmtBlock GhcPs GhcPs]
                -> RnM (([ParStmtBlock GhcRn GhcRn], thing), FreeVars)
        rn_segs :: LocalRdrEnv
    -> [Name]
    -> [ParStmtBlock GhcPs GhcPs]
    -> RnM (([ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    rn_segs LocalRdrEnv
    _ [Name]
    bndrs_so_far []
          = do { let ([Name]
    bndrs', [NonEmpty Name]
    dups) = (Name -> OccName) -> [Name] -> ([Name], [NonEmpty Name])
    forall b a. Ord b => (a -> b) -> [a] -> ([a], [NonEmpty a])
    removeDupsOn Name -> OccName
    nameOccName [Name]
    bndrs_so_far
               ; (NonEmpty Name -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> [NonEmpty Name] -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ NonEmpty Name -> IOEnv (Env TcGblEnv TcLclEnv) ()
    dupErr [NonEmpty Name]
    dups
               ; (thing, fvs) <- [Name] -> RnM (thing, FreeVars) -> RnM (thing, FreeVars)
    forall a. [Name] -> RnM a -> RnM a
    bindLocalNames [Name]
    bndrs' ([Name] -> RnM (thing, FreeVars)
    thing_inside [Name]
    bndrs')
               ; return (([], thing), fvs) }

        rn_segs LocalRdrEnv
    env [Name]
    bndrs_so_far (ParStmtBlock XParStmtBlock GhcPs GhcPs
    x [ExprLStmt GhcPs]
    stmts [IdP GhcPs]
    _ SyntaxExpr GhcPs
    _ : [ParStmtBlock GhcPs GhcPs]
    segs)
          = do { ((stmts', (used_bndrs, segs', thing)), fvs)
                        <- HsStmtContextRn
    -> (HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars))
    -> [LStmt GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))]
    -> ([Name]
        -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars))
    -> RnM
         (([LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))],
           ([Name], [ParStmtBlock GhcRn GhcRn], thing)),
          FreeVars)
    forall (body :: * -> *) thing.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Name] -> RnM (thing, FreeVars))
    -> RnM (([LStmt GhcRn (LocatedA (body GhcRn))], thing), FreeVars)
    rnStmts HsStmtContextRn
    ctxt HsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnExpr [ExprLStmt GhcPs]
    [LStmt GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))]
    stmts (([Name]
      -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars))
     -> RnM
          (([LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))],
            ([Name], [ParStmtBlock GhcRn GhcRn], thing)),
           FreeVars))
    -> ([Name]
        -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars))
    -> RnM
         (([LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))],
           ([Name], [ParStmtBlock GhcRn GhcRn], thing)),
          FreeVars)
    forall a b. (a -> b) -> a -> b
    $ \ [Name]
    bndrs ->
                           LocalRdrEnv
    -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    forall a. LocalRdrEnv -> RnM a -> RnM a
    setLocalRdrEnv LocalRdrEnv
    env       (RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars)
     -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars))
    -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    -> RnM (([Name], [ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    forall a b. (a -> b) -> a -> b
    $ do
                           { ((segs', thing), fvs) <- LocalRdrEnv
    -> [Name]
    -> [ParStmtBlock GhcPs GhcPs]
    -> RnM (([ParStmtBlock GhcRn GhcRn], thing), FreeVars)
    rn_segs LocalRdrEnv
    env ([Name]
    bndrs [Name] -> [Name] -> [Name]
    forall a. [a] -> [a] -> [a]
    ++ [Name]
    bndrs_so_far) [ParStmtBlock GhcPs GhcPs]
    segs
                           ; let used_bndrs = (Name -> Bool) -> [Name] -> [Name]
    forall a. (a -> Bool) -> [a] -> [a]
    filter (Name -> FreeVars -> Bool
    `elemNameSet` FreeVars
    fvs) [Name]
    bndrs
                           ; return ((used_bndrs, segs', thing), fvs) }

               ; let seg' = XParStmtBlock GhcRn GhcRn
    -> [ExprLStmt GhcRn]
    -> [IdP GhcRn]
    -> SyntaxExpr GhcRn
    -> ParStmtBlock GhcRn GhcRn
    forall idL idR.
    XParStmtBlock idL idR
    -> [ExprLStmt idL]
    -> [IdP idR]
    -> SyntaxExpr idR
    -> ParStmtBlock idL idR
    ParStmtBlock XParStmtBlock GhcPs GhcPs
    XParStmtBlock GhcRn GhcRn
    x [ExprLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    stmts' [IdP GhcRn]
    [Name]
    used_bndrs SyntaxExpr GhcRn
    return_op
               ; return ((seg':segs', thing), fvs) }

        dupErr :: NonEmpty Name -> IOEnv (Env TcGblEnv TcLclEnv) ()
    dupErr NonEmpty Name
    vs = TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a b. (a -> b) -> a -> b
    $ Name -> TcRnMessage
    TcRnListComprehensionDuplicateBinding (NonEmpty Name -> Name
    forall a. NonEmpty a -> a
    NE.head NonEmpty Name
    vs)

    lookupQualifiedDoStmtName :: HsStmtContextRn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    -- Like lookupStmtName, but respects QualifiedDo
    lookupQualifiedDoStmtName :: HsStmtContextRn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    lookupQualifiedDoStmtName HsStmtContextRn
    ctxt Name
    n
      = case HsStmtContext (GenLocated SrcSpanAnnN Name) -> Maybe ModuleName
    forall fn. HsStmtContext fn -> Maybe ModuleName
    qualifiedDoModuleName_maybe HsStmtContextRn
    HsStmtContext (GenLocated SrcSpanAnnN Name)
    ctxt of
          Maybe ModuleName
    Nothing -> HsStmtContextRn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    lookupStmtName HsStmtContextRn
    ctxt Name
    n
          Just ModuleName
    modName ->
            (Name -> SyntaxExprRn)
    -> (Name, FreeVars) -> (SyntaxExprRn, FreeVars)
    forall b c d. (b -> c) -> (b, d) -> (c, d)
    forall (a :: * -> * -> *) b c d.
    Arrow a =>
    a b c -> a (b, d) (c, d)
    first (HsExpr GhcRn -> SyntaxExprRn
    mkSyntaxExpr (HsExpr GhcRn -> SyntaxExprRn)
    -> (Name -> HsExpr GhcRn) -> Name -> SyntaxExprRn
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . IdP GhcRn -> HsExpr GhcRn
    Name -> HsExpr GhcRn
    forall (p :: Pass) a.
    IsSrcSpanAnn p a =>
    IdP (GhcPass p) -> HsExpr (GhcPass p)
    nl_HsVar) ((Name, FreeVars) -> (SyntaxExprRn, FreeVars))
    -> RnM (Name, FreeVars)
    -> IOEnv (Env TcGblEnv TcLclEnv) (SyntaxExprRn, FreeVars)
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> Name -> ModuleName -> RnM (Name, FreeVars)
    lookupNameWithQualifier Name
    n ModuleName
    modName

    lookupStmtName :: HsStmtContextRn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    -- Like lookupSyntax, but respects contexts
    lookupStmtName :: HsStmtContextRn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    lookupStmtName HsStmtContextRn
    ctxt Name
    n
      | HsStmtContextRn -> Bool
    rebindableContext HsStmtContextRn
    ctxt
      = Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    lookupSyntax Name
    n
      | Bool
    otherwise
      = (SyntaxExprRn, FreeVars)
    -> IOEnv (Env TcGblEnv TcLclEnv) (SyntaxExprRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Name -> SyntaxExprRn
    mkRnSyntaxExpr Name
    n, FreeVars
    emptyFVs)

    lookupStmtNamePoly :: HsStmtContextRn -> Name -> RnM (HsExpr GhcRn, FreeVars)
    lookupStmtNamePoly :: HsStmtContextRn -> Name -> TcM (HsExpr GhcRn, FreeVars)
    lookupStmtNamePoly HsStmtContextRn
    ctxt Name
    name
      | HsStmtContextRn -> Bool
    rebindableContext HsStmtContextRn
    ctxt
      = do { rebindable_on <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
    xoptM Extension
    LangExt.RebindableSyntax
           ; if rebindable_on
             then do { fm <- lookupOccRn (nameRdrName name)
                     ; return (HsVar noExtField (noLocA fm), unitFV fm) }
             else not_rebindable }
      | Bool
    otherwise
      = TcM (HsExpr GhcRn, FreeVars)
    not_rebindable
      where
        not_rebindable :: TcM (HsExpr GhcRn, FreeVars)
    not_rebindable = (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (XVar GhcRn -> XRec GhcRn (IdP GhcRn) -> HsExpr GhcRn
    forall p. XVar p -> LIdP p -> HsExpr p
    HsVar XVar GhcRn
    NoExtField
    noExtField (Name -> GenLocated SrcSpanAnnN Name
    forall e a. HasAnnotation e => a -> GenLocated e a
    noLocA Name
    name), FreeVars
    emptyFVs)

    -- | Is this a context where we respect RebindableSyntax?
    -- but ListComp are never rebindable
    -- Neither is ArrowExpr, which has its own desugarer in GHC.HsToCore.Arrows
    rebindableContext :: HsStmtContextRn -> Bool
    rebindableContext :: HsStmtContextRn -> Bool
    rebindableContext HsStmtContextRn
    ctxt = case HsStmtContextRn
    ctxt of
      HsDoStmt HsDoFlavour
    flavour -> HsDoFlavour -> Bool
    rebindableDoStmtContext HsDoFlavour
    flavour
      HsStmtContextRn
    ArrowExpr -> Bool
    False
      PatGuard {} -> Bool
    False

      ParStmtCtxt   HsStmtContextRn
    c -> HsStmtContextRn -> Bool
    rebindableContext HsStmtContextRn
    c     -- Look inside to
      TransStmtCtxt HsStmtContextRn
    c -> HsStmtContextRn -> Bool
    rebindableContext HsStmtContextRn
    c     -- the parent context

    rebindableDoStmtContext :: HsDoFlavour -> Bool
    rebindableDoStmtContext :: HsDoFlavour -> Bool
    rebindableDoStmtContext HsDoFlavour
    flavour = case HsDoFlavour
    flavour of
      HsDoFlavour
    ListComp -> Bool
    False
      DoExpr Maybe ModuleName
    m -> Maybe ModuleName -> Bool
    forall a. Maybe a -> Bool
    isNothing Maybe ModuleName
    m
      MDoExpr Maybe ModuleName
    m -> Maybe ModuleName -> Bool
    forall a. Maybe a -> Bool
    isNothing Maybe ModuleName
    m
      HsDoFlavour
    MonadComp -> Bool
    True
      HsDoFlavour
    GhciStmtCtxt -> Bool
    True   -- I suppose?

    {-
    Note [Renaming parallel Stmts]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Renaming parallel statements is painful.  Given, say
         [ a+c | a <- as, bs <- bss
               | c <- bs, a <- ds ]
    Note that
      (a) In order to report "Defined but not used" about 'bs', we must
          rename each group of Stmts with a thing_inside whose FreeVars
          include at least {a,c}

      (b) We want to report that 'a' is illegally bound in both branches

      (c) The 'bs' in the second group must obviously not be captured by
          the binding in the first group

    To satisfy (a) we nest the segments.
    To satisfy (b) we check for duplicates just before thing_inside.
    To satisfy (c) we reset the LocalRdrEnv each time.

    ************************************************************************
    *                                                                      *
    \subsubsection{mdo expressions}
    *                                                                      *
    ************************************************************************
    -}

    type FwdRefs = NameSet
    type Segment stmts = (Defs,
                          Uses,     -- May include defs
                          FwdRefs,  -- A subset of uses that are
                                    --   (a) used before they are bound in this segment, or
                                    --   (b) used here, and bound in subsequent segments
                          stmts)    -- Either Stmt or [Stmt]

    -- wrapper that does both the left- and right-hand sides
    rnRecStmtsAndThen :: AnnoBody body
                      => HsStmtContextRn
                      -> (body GhcPs -> RnM (body GhcRn, FreeVars))
                      -> [LStmt GhcPs (LocatedA (body GhcPs))]
                             -- assumes that the FreeVars returned includes
                             -- the FreeVars of the Segments
                      -> ([Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
                          -> RnM (a, FreeVars))
                      -> RnM (a, FreeVars)
    rnRecStmtsAndThen :: forall (body :: * -> *) a.
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> ([Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
        -> RnM (a, FreeVars))
    -> RnM (a, FreeVars)
    rnRecStmtsAndThen HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [LStmt GhcPs (LocatedA (body GhcPs))]
    s [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    -> RnM (a, FreeVars)
    cont
      = do  { -- (A) Make the mini fixity env for all of the stmts
              fix_env <- [LFixitySig GhcPs] -> RnM MiniFixityEnv
    makeMiniFixityEnv ([LStmt GhcPs (LocatedA (body GhcPs))] -> [LFixitySig GhcPs]
    forall body. [LStmtLR GhcPs GhcPs body] -> [LFixitySig GhcPs]
    collectRecStmtsFixities [LStmt GhcPs (LocatedA (body GhcPs))]
    s)

              -- (B) Do the LHSes
            ; new_lhs_and_fv <- rn_rec_stmts_lhs fix_env s

              --    ...bring them and their fixities into scope
            ; let bound_names = CollectFlag GhcRn
    -> [LStmtLR GhcRn GhcPs (LocatedA (body GhcPs))] -> [IdP GhcRn]
    forall (idL :: Pass) (idR :: Pass) body.
    CollectPass (GhcPass idL) =>
    CollectFlag (GhcPass idL)
    -> [LStmtLR (GhcPass idL) (GhcPass idR) body]
    -> [IdP (GhcPass idL)]
    collectLStmtsBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders (((GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)
     -> GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))))
    -> [(GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
         FreeVars)]
    -> [GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))]
    forall a b. (a -> b) -> [a] -> [b]
    map (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))
    forall a b. (a, b) -> a
    fst [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)]
    new_lhs_and_fv)
                  -- Fake uses of variables introduced implicitly (warning suppression, see #4404)
                  rec_uses = [LStmtLR GhcRn GhcPs (LocatedA (body GhcPs))]
    -> [(SrcSpan, [ImplicitFieldBinders])]
    forall (idR :: Pass) (body :: * -> *).
    [LStmtLR GhcRn (GhcPass idR) (LocatedA (body (GhcPass idR)))]
    -> [(SrcSpan, [ImplicitFieldBinders])]
    lStmtsImplicits (((GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)
     -> GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))))
    -> [(GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
         FreeVars)]
    -> [GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))]
    forall a b. (a -> b) -> [a] -> [b]
    map (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))
    forall a b. (a, b) -> a
    fst [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)]
    new_lhs_and_fv)
                  implicit_uses = [Name] -> FreeVars
    mkNameSet ([Name] -> FreeVars) -> [Name] -> FreeVars
    forall a b. (a -> b) -> a -> b
    $ ((SrcSpan, [ImplicitFieldBinders]) -> [Name])
    -> [(SrcSpan, [ImplicitFieldBinders])] -> [Name]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap ((ImplicitFieldBinders -> [Name])
    -> [ImplicitFieldBinders] -> [Name]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap ImplicitFieldBinders -> [Name]
    implFlBndr_binders ([ImplicitFieldBinders] -> [Name])
    -> ((SrcSpan, [ImplicitFieldBinders]) -> [ImplicitFieldBinders])
    -> (SrcSpan, [ImplicitFieldBinders])
    -> [Name]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (SrcSpan, [ImplicitFieldBinders]) -> [ImplicitFieldBinders]
    forall a b. (a, b) -> b
    snd) ([(SrcSpan, [ImplicitFieldBinders])] -> [Name])
    -> [(SrcSpan, [ImplicitFieldBinders])] -> [Name]
    forall a b. (a -> b) -> a -> b
    $ [(SrcSpan, [ImplicitFieldBinders])]
    rec_uses
            ; bindLocalNamesFV bound_names $
              addLocalFixities fix_env bound_names $ do

              -- (C) do the right-hand-sides and thing-inside
            { segs <- rn_rec_stmts ctxt rnBody bound_names new_lhs_and_fv
            ; (res, fvs) <- cont segs
            ; mapM_ (\(SrcSpan
    loc, [ImplicitFieldBinders]
    ns) -> SrcSpan
    -> FreeVars
    -> Maybe [ImplicitFieldBinders]
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkUnusedRecordWildcard SrcSpan
    loc FreeVars
    fvs ([ImplicitFieldBinders] -> Maybe [ImplicitFieldBinders]
    forall a. a -> Maybe a
    Just [ImplicitFieldBinders]
    ns))
                    rec_uses
            ; warnUnusedLocalBinds bound_names (fvs `unionNameSet` implicit_uses)
            ; return (res, fvs) }}

    -- get all the fixity decls in any Let stmt
    collectRecStmtsFixities :: [LStmtLR GhcPs GhcPs body] -> [LFixitySig GhcPs]
    collectRecStmtsFixities :: forall body. [LStmtLR GhcPs GhcPs body] -> [LFixitySig GhcPs]
    collectRecStmtsFixities [LStmtLR GhcPs GhcPs body]
    l =
        (GenLocated
       (Anno (StmtLR GhcPs GhcPs body)) (StmtLR GhcPs GhcPs body)
     -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
     -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)])
    -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    -> [GenLocated
          (Anno (StmtLR GhcPs GhcPs body)) (StmtLR GhcPs GhcPs body)]
    -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr (\ GenLocated
      (Anno (StmtLR GhcPs GhcPs body)) (StmtLR GhcPs GhcPs body)
    s -> \[GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    acc -> case GenLocated
      (Anno (StmtLR GhcPs GhcPs body)) (StmtLR GhcPs GhcPs body)
    s of
                (L Anno (StmtLR GhcPs GhcPs body)
    _ (LetStmt XLetStmt GhcPs GhcPs body
    _ (HsValBinds XHsValBinds GhcPs GhcPs
    _ (ValBinds XValBinds GhcPs GhcPs
    _ LHsBindsLR GhcPs GhcPs
    _ [LSig GhcPs]
    sigs)))) ->
                  (GenLocated SrcSpanAnnA (Sig GhcPs)
     -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
     -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)])
    -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    -> [GenLocated SrcSpanAnnA (Sig GhcPs)]
    -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr (\ GenLocated SrcSpanAnnA (Sig GhcPs)
    sig -> \ [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    acc -> case GenLocated SrcSpanAnnA (Sig GhcPs)
    sig of
                                             (L SrcSpanAnnA
    loc (FixSig XFixSig GhcPs
    _ FixitySig GhcPs
    s)) -> (SrcSpanAnnA
    -> FixitySig GhcPs -> GenLocated SrcSpanAnnA (FixitySig GhcPs)
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc FixitySig GhcPs
    s) GenLocated SrcSpanAnnA (FixitySig GhcPs)
    -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    forall a. a -> [a] -> [a]
    : [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    acc
                                             GenLocated SrcSpanAnnA (Sig GhcPs)
    _ -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    acc) [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    acc [LSig GhcPs]
    [GenLocated SrcSpanAnnA (Sig GhcPs)]
    sigs
                GenLocated
      (Anno (StmtLR GhcPs GhcPs body)) (StmtLR GhcPs GhcPs body)
    _ -> [GenLocated SrcSpanAnnA (FixitySig GhcPs)]
    acc) [] [LStmtLR GhcPs GhcPs body]
    [GenLocated
       (Anno (StmtLR GhcPs GhcPs body)) (StmtLR GhcPs GhcPs body)]
    l

    -- left-hand sides

    rn_rec_stmt_lhs :: AnnoBody body => MiniFixityEnv
                    -> LStmt GhcPs (LocatedA (body GhcPs))
                       -- rename LHS, and return its FVs
                       -- Warning: we will only need the FreeVars below in the case of a BindStmt,
                       -- so we don't bother to compute it accurately in the other cases
                    -> RnM [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]

    rn_rec_stmt_lhs :: forall (body :: * -> *).
    AnnoBody body =>
    MiniFixityEnv
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> RnM [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    rn_rec_stmt_lhs MiniFixityEnv
    _ (L SrcSpanAnnA
    loc (BodyStmt XBodyStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ LocatedA (body GhcPs)
    body SyntaxExpr GhcPs
    a SyntaxExpr GhcPs
    b))
      = [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)]
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return [(SrcSpanAnnA
    -> StmtLR GhcRn GhcPs (LocatedA (body GhcPs))
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc (XBodyStmt GhcRn GhcPs (LocatedA (body GhcPs))
    -> LocatedA (body GhcPs)
    -> SyntaxExpr GhcPs
    -> SyntaxExpr GhcPs
    -> StmtLR GhcRn GhcPs (LocatedA (body GhcPs))
    forall idL idR body.
    XBodyStmt idL idR body
    -> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
    BodyStmt XBodyStmt GhcRn GhcPs (LocatedA (body GhcPs))
    NoExtField
    noExtField LocatedA (body GhcPs)
    body SyntaxExpr GhcPs
    a SyntaxExpr GhcPs
    b), FreeVars
    emptyFVs)]

    rn_rec_stmt_lhs MiniFixityEnv
    _ (L SrcSpanAnnA
    loc (LastStmt XLastStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ LocatedA (body GhcPs)
    body Maybe Bool
    noret SyntaxExpr GhcPs
    a))
      = [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)]
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return [(SrcSpanAnnA
    -> StmtLR GhcRn GhcPs (LocatedA (body GhcPs))
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc (XLastStmt GhcRn GhcPs (LocatedA (body GhcPs))
    -> LocatedA (body GhcPs)
    -> Maybe Bool
    -> SyntaxExpr GhcPs
    -> StmtLR GhcRn GhcPs (LocatedA (body GhcPs))
    forall idL idR body.
    XLastStmt idL idR body
    -> body -> Maybe Bool -> SyntaxExpr idR -> StmtLR idL idR body
    LastStmt XLastStmt GhcRn GhcPs (LocatedA (body GhcPs))
    NoExtField
    noExtField LocatedA (body GhcPs)
    body Maybe Bool
    noret SyntaxExpr GhcPs
    a), FreeVars
    emptyFVs)]

    rn_rec_stmt_lhs MiniFixityEnv
    fix_env (L SrcSpanAnnA
    loc (BindStmt XBindStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ LPat GhcPs
    pat LocatedA (body GhcPs)
    body))
      = do
          -- should the ctxt be MDo instead?
          (pat', fv_pat) <- NameMaker -> LPat GhcPs -> RnM (LPat GhcRn, FreeVars)
    rnBindPat (MiniFixityEnv -> NameMaker
    localRecNameMaker MiniFixityEnv
    fix_env) LPat GhcPs
    pat
          return [(L loc (BindStmt noAnn pat' body), fv_pat)]

    rn_rec_stmt_lhs MiniFixityEnv
    _ (L SrcSpanAnnA
    _ (LetStmt XLetStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ binds :: HsLocalBinds GhcPs
    binds@(HsIPBinds {})))
      = TcRnMessage
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall a. TcRnMessage -> TcRn a
    failWith (Either (HsLocalBinds GhcPs) (HsLocalBindsLR GhcRn GhcPs)
    -> TcRnMessage
    badIpBinds (HsLocalBinds GhcPs
    -> Either (HsLocalBinds GhcPs) (HsLocalBindsLR GhcRn GhcPs)
    forall a b. a -> Either a b
    Left HsLocalBinds GhcPs
    binds))

    rn_rec_stmt_lhs MiniFixityEnv
    fix_env (L SrcSpanAnnA
    loc (LetStmt XLetStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ (HsValBinds XHsValBinds GhcPs GhcPs
    x HsValBindsLR GhcPs GhcPs
    binds)))
        = do (_bound_names, binds') <- MiniFixityEnv
    -> HsValBindsLR GhcPs GhcPs
    -> RnM ([Name], HsValBindsLR GhcRn GhcPs)
    rnLocalValBindsLHS MiniFixityEnv
    fix_env HsValBindsLR GhcPs GhcPs
    binds
             return [(L loc (LetStmt noAnn (HsValBinds x binds')),
                     -- Warning: this is bogus; see function invariant
                     emptyFVs
                     )]

    -- XXX Do we need to do something with the return and mfix names?
    rn_rec_stmt_lhs MiniFixityEnv
    fix_env (L SrcSpanAnnA
    _ (RecStmt { recS_stmts :: forall idL idR body.
    StmtLR idL idR body -> XRec idR [LStmtLR idL idR body]
    recS_stmts = L SrcSpanAnnL
    _ [GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    stmts }))  -- Flatten Rec inside Rec
        = MiniFixityEnv
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(XRec GhcRn (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall (body :: * -> *).
    AnnoBody body =>
    MiniFixityEnv
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> RnM [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    rn_rec_stmts_lhs MiniFixityEnv
    fix_env [LStmt GhcPs (LocatedA (body GhcPs))]
    [GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    stmts

    rn_rec_stmt_lhs MiniFixityEnv
    _ stmt :: LStmt GhcPs (LocatedA (body GhcPs))
    stmt@(L SrcSpanAnnA
    _ (ParStmt {}))       -- Syntactically illegal in mdo
      = String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rn_rec_stmt" (GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    stmt)

    rn_rec_stmt_lhs MiniFixityEnv
    _ stmt :: LStmt GhcPs (LocatedA (body GhcPs))
    stmt@(L SrcSpanAnnA
    _ (TransStmt {}))     -- Syntactically illegal in mdo
      = String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rn_rec_stmt" (GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    stmt)

    rn_rec_stmt_lhs MiniFixityEnv
    _ stmt :: LStmt GhcPs (LocatedA (body GhcPs))
    stmt@(L SrcSpanAnnA
    _ (ApplicativeStmt {})) -- Shouldn't appear yet
      = String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rn_rec_stmt" (GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    stmt)

    rn_rec_stmt_lhs MiniFixityEnv
    _ (L SrcSpanAnnA
    _ (LetStmt XLetStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ (EmptyLocalBinds XEmptyLocalBinds GhcPs GhcPs
    _)))
      = String
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall a. HasCallStack => String -> a
    panic String
    "rn_rec_stmt LetStmt EmptyLocalBinds"

    rn_rec_stmts_lhs :: AnnoBody body => MiniFixityEnv
                     -> [LStmt GhcPs (LocatedA (body GhcPs))]
                     -> RnM [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    rn_rec_stmts_lhs :: forall (body :: * -> *).
    AnnoBody body =>
    MiniFixityEnv
    -> [LStmt GhcPs (LocatedA (body GhcPs))]
    -> RnM [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    rn_rec_stmts_lhs MiniFixityEnv
    fix_env [LStmt GhcPs (LocatedA (body GhcPs))]
    stmts
      = do { ls <- (GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          [(GenLocated
              SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
            FreeVars)])
    -> [GenLocated
          SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall (m :: * -> *) (f :: * -> *) a b.
    (Monad m, Traversable f) =>
    (a -> m [b]) -> f a -> m [b]
    concatMapM (MiniFixityEnv
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(XRec GhcRn (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
           FreeVars)]
    forall (body :: * -> *).
    AnnoBody body =>
    MiniFixityEnv
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> RnM [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    rn_rec_stmt_lhs MiniFixityEnv
    fix_env) [LStmt GhcPs (LocatedA (body GhcPs))]
    [GenLocated
       SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))]
    stmts
           ; let boundNames = CollectFlag GhcRn
    -> [XRec GhcRn (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))]
    -> [IdP GhcRn]
    forall (idL :: Pass) (idR :: Pass) body.
    CollectPass (GhcPass idL) =>
    CollectFlag (GhcPass idL)
    -> [LStmtLR (GhcPass idL) (GhcPass idR) body]
    -> [IdP (GhcPass idL)]
    collectLStmtsBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders (((GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)
     -> GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))))
    -> [(GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
         FreeVars)]
    -> [GenLocated
          SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))]
    forall a b. (a -> b) -> [a] -> [b]
    map (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs)))
    forall a b. (a, b) -> a
    fst [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)]
    ls)
                -- First do error checking: we need to check for dups here because we
                -- don't bind all of the variables from the Stmt at once
                -- with bindLocatedLocals.
           ; checkDupNames boundNames
           ; return ls }

    -- right-hand-sides

    rn_rec_stmt :: AnnoBody body =>
                   HsStmtContextRn
                -> (body GhcPs -> RnM (body GhcRn, FreeVars))
                -> [Name]
                -> (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
                -> RnM [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
            -- Rename a Stmt that is inside a RecStmt (or mdo)
            -- Assumes all binders are already in scope
            -- Turns each stmt into a singleton Stmt
    rn_rec_stmt :: forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [Name]
    -> (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    -> RnM [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    rn_rec_stmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [Name]
    _ (L SrcSpanAnnA
    loc (LastStmt XLastStmt GhcRn GhcPs (LocatedA (body GhcPs))
    _ (L SrcSpanAnnA
    lb body GhcPs
    body) Maybe Bool
    noret SyntaxExpr GhcPs
    _), FreeVars
    _)
      = do  { (body', fv_expr) <- body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody body GhcPs
    body
            ; (ret_op, fvs1)   <- lookupQualifiedDo ctxt returnMName
            ; return [(emptyNameSet, fv_expr `plusFV` fvs1, emptyNameSet,
                       L loc (LastStmt noExtField (L lb body') noret ret_op))] }

    rn_rec_stmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [Name]
    _ (L SrcSpanAnnA
    loc (BodyStmt XBodyStmt GhcRn GhcPs (LocatedA (body GhcPs))
    _ (L SrcSpanAnnA
    lb body GhcPs
    body) SyntaxExpr GhcPs
    _ SyntaxExpr GhcPs
    _), FreeVars
    _)
      = do { (body', fvs) <- body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody body GhcPs
    body
           ; (then_op, fvs1) <- lookupQualifiedDo ctxt thenMName
           ; return [(emptyNameSet, fvs `plusFV` fvs1, emptyNameSet,
                     L loc (BodyStmt noExtField (L lb body') then_op noSyntaxExpr))] }

    rn_rec_stmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [Name]
    _ (L SrcSpanAnnA
    loc (BindStmt XBindStmt GhcRn GhcPs (LocatedA (body GhcPs))
    _ LPat GhcRn
    pat' (L SrcSpanAnnA
    lb body GhcPs
    body)), FreeVars
    fv_pat)
      = do { (body', fv_expr) <- body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody body GhcPs
    body
           ; (bind_op, fvs1) <- lookupQualifiedDo ctxt bindMName

           ; (fail_op, fvs2) <- getMonadFailOp ctxt

           ; let bndrs = [Name] -> FreeVars
    mkNameSet (CollectFlag GhcRn -> LPat GhcRn -> [IdP GhcRn]
    forall p. CollectPass p => CollectFlag p -> LPat p -> [IdP p]
    collectPatBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders LPat GhcRn
    pat')
                 fvs   = FreeVars
    fv_expr FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fv_pat FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs1 FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs2
           ; let xbsrn = XBindStmtRn { xbsrn_bindOp :: SyntaxExpr GhcRn
    xbsrn_bindOp = SyntaxExpr GhcRn
    SyntaxExprRn
    bind_op, xbsrn_failOp :: Maybe (SyntaxExpr GhcRn)
    xbsrn_failOp = Maybe (SyntaxExpr GhcRn)
    Maybe SyntaxExprRn
    fail_op }
           ; return [(bndrs, fvs, bndrs `intersectNameSet` fvs,
                      L loc (BindStmt xbsrn pat' (L lb body')))] }

    rn_rec_stmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [Name]
    _ (L SrcSpanAnnA
    _ (LetStmt XLetStmt GhcRn GhcPs (LocatedA (body GhcPs))
    _ binds :: HsLocalBindsLR GhcRn GhcPs
    binds@(HsIPBinds {})), FreeVars
    _)
      = TcRnMessage
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(FreeVars, FreeVars, FreeVars,
           GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    forall a. TcRnMessage -> TcRn a
    failWith (Either (HsLocalBinds GhcPs) (HsLocalBindsLR GhcRn GhcPs)
    -> TcRnMessage
    badIpBinds (HsLocalBindsLR GhcRn GhcPs
    -> Either (HsLocalBinds GhcPs) (HsLocalBindsLR GhcRn GhcPs)
    forall a b. b -> Either a b
    Right HsLocalBindsLR GhcRn GhcPs
    binds))

    rn_rec_stmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [Name]
    all_bndrs (L SrcSpanAnnA
    loc (LetStmt XLetStmt GhcRn GhcPs (LocatedA (body GhcPs))
    _ (HsValBinds XHsValBinds GhcRn GhcPs
    x HsValBindsLR GhcRn GhcPs
    binds')), FreeVars
    _)
      = do { (binds', du_binds) <- FreeVars
    -> HsValBindsLR GhcRn GhcPs -> RnM (HsValBinds GhcRn, DefUses)
    rnLocalValBindsRHS ([Name] -> FreeVars
    mkNameSet [Name]
    all_bndrs) HsValBindsLR GhcRn GhcPs
    binds'
               -- fixities and unused are handled above in rnRecStmtsAndThen
           ; let fvs = DefUses -> FreeVars
    allUses DefUses
    du_binds
           ; return [(duDefs du_binds, fvs, emptyNameSet,
                     L loc (LetStmt noAnn (HsValBinds x binds')))] }

    -- no RecStmt case because they get flattened above when doing the LHSes
    rn_rec_stmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [Name]
    _ stmt :: (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    stmt@(L SrcSpanAnnA
    _ (RecStmt {}), FreeVars
    _)
      = String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(FreeVars, FreeVars, FreeVars,
           GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rn_rec_stmt: RecStmt" ((GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    stmt)

    rn_rec_stmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [Name]
    _ stmt :: (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    stmt@(L SrcSpanAnnA
    _ (ParStmt {}), FreeVars
    _)       -- Syntactically illegal in mdo
      = String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(FreeVars, FreeVars, FreeVars,
           GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rn_rec_stmt: ParStmt" ((GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    stmt)

    rn_rec_stmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [Name]
    _ stmt :: (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    stmt@(L SrcSpanAnnA
    _ (TransStmt {}), FreeVars
    _)     -- Syntactically illegal in mdo
      = String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(FreeVars, FreeVars, FreeVars,
           GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rn_rec_stmt: TransStmt" ((GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    stmt)

    rn_rec_stmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [Name]
    _ (L SrcSpanAnnA
    _ (LetStmt XLetStmt GhcRn GhcPs (LocatedA (body GhcPs))
    _ (EmptyLocalBinds XEmptyLocalBinds GhcRn GhcPs
    _)), FreeVars
    _)
      = String
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(FreeVars, FreeVars, FreeVars,
           GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    forall a. HasCallStack => String -> a
    panic String
    "rn_rec_stmt: LetStmt EmptyLocalBinds"

    rn_rec_stmt HsStmtContextRn
    _ body GhcPs -> RnM (body GhcRn, FreeVars)
    _ [Name]
    _ stmt :: (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    stmt@(L SrcSpanAnnA
    _ (ApplicativeStmt {}), FreeVars
    _)
      = String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(FreeVars, FreeVars, FreeVars,
           GenLocated
             SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "rn_rec_stmt: ApplicativeStmt" ((GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    (GenLocated
       SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
     FreeVars)
    stmt)

    rn_rec_stmts :: AnnoBody body
                 => HsStmtContextRn
                 -> (body GhcPs -> RnM (body GhcRn, FreeVars))
                 -> [Name]
                 -> [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
                 -> RnM [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    rn_rec_stmts :: forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [Name]
    -> [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    -> RnM [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    rn_rec_stmts HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [Name]
    bndrs [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    stmts
      = do { segs_s <- ((GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          [Segment
             (GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))])
    -> [(GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
         FreeVars)]
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [[Segment
             (GenLocated
                SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [Name]
    -> (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(FreeVars, FreeVars, FreeVars,
           XRec GhcRn (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))))]
    forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> (body GhcPs -> RnM (body GhcRn, FreeVars))
    -> [Name]
    -> (LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)
    -> RnM [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    rn_rec_stmt HsStmtContextRn
    ctxt body GhcPs -> RnM (body GhcRn, FreeVars)
    rnBody [Name]
    bndrs) [(LStmtLR GhcRn GhcPs (LocatedA (body GhcPs)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcPs (LocatedA (body GhcPs))),
      FreeVars)]
    stmts
           ; return (concat segs_s) }

    ---------------------------------------------
    segmentRecStmts :: SrcSpan -> HsStmtContextRn
                    -> Stmt GhcRn (LocatedA (body GhcRn))
                    -> [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
                    -> (FreeVars, Bool)
                        -- ^ The free variables used in later statements.
                        -- If the boolean is 'True', this might be an underestimate
                        -- because we are in GHCi, and might thus be missing some "used later"
                        -- FVs. See Note [What is "used later" in a rec stmt]
                    -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)

    segmentRecStmts :: forall (body :: * -> *).
    SrcSpan
    -> HsStmtContextRn
    -> Stmt GhcRn (LocatedA (body GhcRn))
    -> [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    -> (FreeVars, Bool)
    -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    segmentRecStmts SrcSpan
    loc HsStmtContextRn
    ctxt Stmt GhcRn (LocatedA (body GhcRn))
    empty_rec_stmt [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    segs (FreeVars
    fvs_later, Bool
    might_be_more_fvs_later)
      | [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    segs
      = ([], FreeVars
    final_fv_uses)

      | HsDoStmt (MDoExpr Maybe ModuleName
    _) <- HsStmtContextRn
    ctxt
      = Stmt GhcRn (LocatedA (body GhcRn))
    -> [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    -> FreeVars
    -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    forall (body :: * -> *).
    Stmt GhcRn (LocatedA (body GhcRn))
    -> [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    -> FreeVars
    -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    segsToStmts Stmt GhcRn (LocatedA (body GhcRn))
    empty_rec_stmt [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    grouped_segs FreeVars
    fvs_later
                   -- Step 4: Turn the segments into Stmts
                    --         Use RecStmt when and only when there are fwd refs
                    --         Also gather up the uses from the end towards the
                    --         start, so we can tell the RecStmt which things are
                    --         used 'after' the RecStmt

      | Bool
    otherwise
      = ([ SrcSpanAnnA
    -> Stmt GhcRn (LocatedA (body GhcRn))
    -> GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    forall l e. l -> e -> GenLocated l e
    L (SrcSpan -> SrcSpanAnnA
    forall e. HasAnnotation e => SrcSpan -> e
    noAnnSrcSpan SrcSpan
    loc) (Stmt GhcRn (LocatedA (body GhcRn))
     -> GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))
    -> Stmt GhcRn (LocatedA (body GhcRn))
    -> GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    forall a b. (a -> b) -> a -> b
    $
           Stmt GhcRn (LocatedA (body GhcRn))
    empty_rec_stmt { recS_stmts = noLocA ss
                          , recS_later_ids = nameSetElemsStable final_fvs_later
                          , recS_rec_ids   = nameSetElemsStable
                                               (defs `intersectNameSet` uses) }]
              -- See Note [Deterministic ApplicativeDo and RecursiveDo desugaring]
        , FreeVars
    uses FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    final_fv_uses)

      where
        (FreeVars
    final_fv_uses, FreeVars
    final_fvs_later)
          | Bool
    might_be_more_fvs_later
          = (FreeVars
    defs, FreeVars
    defs)
            -- If there might be more uses later (e.g. we are in GHCi and have not
            -- yet seen the whole rec statement), conservatively assume that everything
            -- will be used later (as is possible).
          | Bool
    otherwise
          = ( FreeVars
    uses FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fvs_later
            , FreeVars
    defs FreeVars -> FreeVars -> FreeVars
    `intersectNameSet` FreeVars
    fvs_later )

        ([FreeVars]
    defs_s, [FreeVars]
    uses_s, [FreeVars]
    _, [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    ss) = [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    -> ([FreeVars], [FreeVars], [FreeVars],
        [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))])
    forall a b c d. [(a, b, c, d)] -> ([a], [b], [c], [d])
    unzip4 [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    segs
        defs :: FreeVars
    defs = [FreeVars] -> FreeVars
    plusFVs [FreeVars]
    defs_s
        uses :: FreeVars
    uses = [FreeVars] -> FreeVars
    plusFVs [FreeVars]
    uses_s

                    -- Step 2: Fill in the fwd refs.
                    --         The segments are all singletons, but their fwd-ref
                    --         field mentions all the things used by the segment
                    --         that are bound after their use
        segs_w_fwd_refs :: [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    segs_w_fwd_refs = [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    -> [Segment
          (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    forall a. [Segment a] -> [Segment a]
    addFwdRefs [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    segs

                    -- Step 3: Group together the segments to make bigger segments
                    --         Invariant: in the result, no segment uses a variable
                    --                    bound in a later segment
        grouped_segs :: [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    grouped_segs = HsStmtContextRn
    -> [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    -> [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    forall body.
    HsStmtContextRn
    -> [Segment (LStmt GhcRn body)] -> [Segment [LStmt GhcRn body]]
    glomSegments HsStmtContextRn
    ctxt [Segment (LStmt GhcRn (LocatedA (body GhcRn)))]
    [Segment
       (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn))))]
    segs_w_fwd_refs

    ----------------------------
    addFwdRefs :: [Segment a] -> [Segment a]
    -- So far the segments only have forward refs *within* the Stmt
    --      (which happens for bind:  x <- ...x...)
    -- This function adds the cross-seg fwd ref info

    addFwdRefs :: forall a. [Segment a] -> [Segment a]
    addFwdRefs [Segment a]
    segs
      = ([Segment a], FreeVars) -> [Segment a]
    forall a b. (a, b) -> a
    fst ((Segment a -> ([Segment a], FreeVars) -> ([Segment a], FreeVars))
    -> ([Segment a], FreeVars)
    -> [Segment a]
    -> ([Segment a], FreeVars)
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr Segment a -> ([Segment a], FreeVars) -> ([Segment a], FreeVars)
    forall {d}.
    (FreeVars, FreeVars, FreeVars, d)
    -> ([(FreeVars, FreeVars, FreeVars, d)], FreeVars)
    -> ([(FreeVars, FreeVars, FreeVars, d)], FreeVars)
    mk_seg ([], FreeVars
    emptyNameSet) [Segment a]
    segs)
      where
        mk_seg :: (FreeVars, FreeVars, FreeVars, d)
    -> ([(FreeVars, FreeVars, FreeVars, d)], FreeVars)
    -> ([(FreeVars, FreeVars, FreeVars, d)], FreeVars)
    mk_seg (FreeVars
    defs, FreeVars
    uses, FreeVars
    fwds, d
    stmts) ([(FreeVars, FreeVars, FreeVars, d)]
    segs, FreeVars
    later_defs)
            = ((FreeVars, FreeVars, FreeVars, d)
    new_seg (FreeVars, FreeVars, FreeVars, d)
    -> [(FreeVars, FreeVars, FreeVars, d)]
    -> [(FreeVars, FreeVars, FreeVars, d)]
    forall a. a -> [a] -> [a]
    : [(FreeVars, FreeVars, FreeVars, d)]
    segs, FreeVars
    all_defs)
            where
              new_seg :: (FreeVars, FreeVars, FreeVars, d)
    new_seg = (FreeVars
    defs, FreeVars
    uses, FreeVars
    new_fwds, d
    stmts)
              all_defs :: FreeVars
    all_defs = FreeVars
    later_defs FreeVars -> FreeVars -> FreeVars
    `unionNameSet` FreeVars
    defs
              new_fwds :: FreeVars
    new_fwds = FreeVars
    fwds FreeVars -> FreeVars -> FreeVars
    `unionNameSet` (FreeVars
    uses FreeVars -> FreeVars -> FreeVars
    `intersectNameSet` FreeVars
    later_defs)
                    -- Add the downstream fwd refs here

    {-
    Note [Segmenting mdo]
    ~~~~~~~~~~~~~~~~~~~~~
    NB. June 7 2012: We only glom segments that appear in an explicit mdo;
    and leave those found in "do rec"'s intact.  See
    https://gitlab.haskell.org/ghc/ghc/issues/4148 for the discussion
    leading to this design choice.  Hence the test in segmentRecStmts.

    Note [Glomming segments]
    ~~~~~~~~~~~~~~~~~~~~~~~~
    Glomming the singleton segments of an mdo into minimal recursive groups.

    At first I thought this was just strongly connected components, but
    there's an important constraint: the order of the stmts must not change.

    Consider
         mdo { x <- ...y...
               p <- z
               y <- ...x...
               q <- x
               z <- y
               r <- x }

    Here, the first stmt mention 'y', which is bound in the third.
    But that means that the innocent second stmt (p <- z) gets caught
    up in the recursion.  And that in turn means that the binding for
    'z' has to be included... and so on.

    Start at the tail { r <- x }
    Now add the next one { z <- y ; r <- x }
    Now add one more     { q <- x ; z <- y ; r <- x }
    Now one more... but this time we have to group a bunch into rec
         { rec { y <- ...x... ; q <- x ; z <- y } ; r <- x }
    Now one more, which we can add on without a rec
         { p <- z ;
           rec { y <- ...x... ; q <- x ; z <- y } ;
           r <- x }
    Finally we add the last one; since it mentions y we have to
    glom it together with the first two groups
         { rec { x <- ...y...; p <- z ; y <- ...x... ;
                 q <- x ; z <- y } ;
           r <- x }

    Note [What is "used later" in a rec stmt]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    We desugar a recursive Stmt to something like

      (a,_,c) <- mfix (\(a,b,_) -> do { ... ; return (a,b,c) })
      ...stuff after the rec...

    The knot-tied tuple must contain
    * All the variables that are used before they are bound in the `rec` block
    * All the variables that are used after the entire `rec` block

    In the case of GHCi, however, we don't know what variables will be used
    after the `rec` (#20206).  For example, we might have
        ghci>  rec { x <- e1; y <- e2 }
        ghci>  print x
        ghci>  print y

    So we have to assume that *all* the variables bound in the `rec` are used
    afterwards.  We pass a Boolean to segmentRecStmts to signal such a situation,
    in which case that function conservatively assumes that everything might well
    be used later.
    -}

    glomSegments :: HsStmtContextRn
                 -> [Segment (LStmt GhcRn body)]
                 -> [Segment [LStmt GhcRn body]]
                                      -- Each segment has a non-empty list of Stmts
    -- See Note [Glomming segments]

    glomSegments :: forall body.
    HsStmtContextRn
    -> [Segment (LStmt GhcRn body)] -> [Segment [LStmt GhcRn body]]
    glomSegments HsStmtContextRn
    _ [] = []
    glomSegments HsStmtContextRn
    ctxt ((FreeVars
    defs,FreeVars
    uses,FreeVars
    fwds,LStmt GhcRn body
    stmt) : [Segment (LStmt GhcRn body)]
    segs)
            -- Actually stmts will always be a singleton
      = (FreeVars
    seg_defs, FreeVars
    seg_uses, FreeVars
    seg_fwds, [GenLocated
       (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]
    seg_stmts)  Segment
      [GenLocated
         (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]
    -> [Segment
          [GenLocated
             (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    -> [Segment
          [GenLocated
             (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    forall a. a -> [a] -> [a]
    : [Segment
       [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    others
      where
        segs' :: [(FreeVars, FreeVars, FreeVars, [LStmt GhcRn body])]
    segs'            = HsStmtContextRn
    -> [Segment (LStmt GhcRn body)]
    -> [(FreeVars, FreeVars, FreeVars, [LStmt GhcRn body])]
    forall body.
    HsStmtContextRn
    -> [Segment (LStmt GhcRn body)] -> [Segment [LStmt GhcRn body]]
    glomSegments HsStmtContextRn
    ctxt [Segment (LStmt GhcRn body)]
    segs
        ([Segment
       [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    extras, [Segment
       [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    others) = FreeVars
    -> [Segment
          [GenLocated
             (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    -> ([Segment
           [GenLocated
              (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]],
        [Segment
           [GenLocated
              (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]])
    forall a. FreeVars -> [Segment a] -> ([Segment a], [Segment a])
    grab FreeVars
    uses [(FreeVars, FreeVars, FreeVars, [LStmt GhcRn body])]
    [Segment
       [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    segs'
        ([FreeVars]
    ds, [FreeVars]
    us, [FreeVars]
    fs, [[GenLocated
        (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    ss) = [Segment
       [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    -> ([FreeVars], [FreeVars], [FreeVars],
        [[GenLocated
            (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]])
    forall a b c d. [(a, b, c, d)] -> ([a], [b], [c], [d])
    unzip4 [Segment
       [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    extras

        seg_defs :: FreeVars
    seg_defs  = [FreeVars] -> FreeVars
    plusFVs [FreeVars]
    ds FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    defs
        seg_uses :: FreeVars
    seg_uses  = [FreeVars] -> FreeVars
    plusFVs [FreeVars]
    us FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    uses
        seg_fwds :: FreeVars
    seg_fwds  = [FreeVars] -> FreeVars
    plusFVs [FreeVars]
    fs FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    fwds
        seg_stmts :: [GenLocated
       (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]
    seg_stmts = LStmt GhcRn body
    GenLocated
      (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)
    stmt GenLocated
      (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)
    -> [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]
    -> [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]
    forall a. a -> [a] -> [a]
    : [[GenLocated
        (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    -> [GenLocated
          (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]
    forall (t :: * -> *) a. Foldable t => t [a] -> [a]
    concat [[GenLocated
        (Anno (StmtLR GhcRn GhcRn body)) (StmtLR GhcRn GhcRn body)]]
    ss

        grab :: NameSet             -- The client
             -> [Segment a]
             -> ([Segment a],       -- Needed by the 'client'
                 [Segment a])       -- Not needed by the client
            -- The result is simply a split of the input
        grab :: forall a. FreeVars -> [Segment a] -> ([Segment a], [Segment a])
    grab FreeVars
    uses [Segment a]
    dus
            = ([Segment a] -> [Segment a]
    forall a. [a] -> [a]
    reverse [Segment a]
    yeses, [Segment a] -> [Segment a]
    forall a. [a] -> [a]
    reverse [Segment a]
    noes)
            where
              ([Segment a]
    noes, [Segment a]
    yeses)           = (Segment a -> Bool) -> [Segment a] -> ([Segment a], [Segment a])
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    span Segment a -> Bool
    not_needed ([Segment a] -> [Segment a]
    forall a. [a] -> [a]
    reverse [Segment a]
    dus)
              not_needed :: Segment a -> Bool
    not_needed (FreeVars
    defs,FreeVars
    _,FreeVars
    _,a
    _) = FreeVars -> FreeVars -> Bool
    disjointNameSet FreeVars
    defs FreeVars
    uses

    ----------------------------------------------------
    segsToStmts :: Stmt GhcRn (LocatedA (body GhcRn))
                                      -- A RecStmt with the SyntaxOps filled in
                -> [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
                                      -- Each Segment has a non-empty list of Stmts
                -> FreeVars           -- Free vars used 'later'
                -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)

    segsToStmts :: forall (body :: * -> *).
    Stmt GhcRn (LocatedA (body GhcRn))
    -> [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    -> FreeVars
    -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    segsToStmts Stmt GhcRn (LocatedA (body GhcRn))
    _ [] FreeVars
    fvs_later = ([], FreeVars
    fvs_later)
    segsToStmts Stmt GhcRn (LocatedA (body GhcRn))
    empty_rec_stmt ((FreeVars
    defs, FreeVars
    uses, FreeVars
    fwds, [LStmt GhcRn (LocatedA (body GhcRn))]
    ss) : [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    segs) FreeVars
    fvs_later
      = Bool
    -> ([GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))],
        FreeVars)
    -> ([GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))],
        FreeVars)
    forall a. HasCallStack => Bool -> a -> a
    assert (Bool -> Bool
    not ([GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [LStmt GhcRn (LocatedA (body GhcRn))]
    [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    ss))
        (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    new_stmt GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    -> [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    -> [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    forall a. a -> [a] -> [a]
    : [LStmt GhcRn (LocatedA (body GhcRn))]
    [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    later_stmts, FreeVars
    later_uses FreeVars -> FreeVars -> FreeVars
    `plusFV` FreeVars
    uses)
      where
        ([LStmt GhcRn (LocatedA (body GhcRn))]
    later_stmts, FreeVars
    later_uses) = Stmt GhcRn (LocatedA (body GhcRn))
    -> [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    -> FreeVars
    -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    forall (body :: * -> *).
    Stmt GhcRn (LocatedA (body GhcRn))
    -> [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    -> FreeVars
    -> ([LStmt GhcRn (LocatedA (body GhcRn))], FreeVars)
    segsToStmts Stmt GhcRn (LocatedA (body GhcRn))
    empty_rec_stmt [Segment [LStmt GhcRn (LocatedA (body GhcRn))]]
    segs FreeVars
    fvs_later
        new_stmt :: GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    new_stmt | Bool
    non_rec   = [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    -> GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    forall a. HasCallStack => [a] -> a
    head [LStmt GhcRn (LocatedA (body GhcRn))]
    [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    ss
                 | Bool
    otherwise = SrcSpanAnnA
    -> Stmt GhcRn (LocatedA (body GhcRn))
    -> GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    forall l e. l -> e -> GenLocated l e
    L (GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    -> SrcSpanAnnA
    forall l e. GenLocated l e -> l
    getLoc ([GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    -> GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))
    forall a. HasCallStack => [a] -> a
    head [LStmt GhcRn (LocatedA (body GhcRn))]
    [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    ss)) Stmt GhcRn (LocatedA (body GhcRn))
    rec_stmt
        rec_stmt :: Stmt GhcRn (LocatedA (body GhcRn))
    rec_stmt = Stmt GhcRn (LocatedA (body GhcRn))
    empty_rec_stmt { recS_stmts     = noLocA ss
                                  , recS_later_ids = nameSetElemsStable used_later
                                  , recS_rec_ids   = nameSetElemsStable fwds }
              -- See Note [Deterministic ApplicativeDo and RecursiveDo desugaring]
        non_rec :: Bool
    non_rec    = [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    -> Bool
    forall a. [a] -> Bool
    isSingleton [LStmt GhcRn (LocatedA (body GhcRn))]
    [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (body GhcRn)))]
    ss Bool -> Bool -> Bool
    && FreeVars -> Bool
    isEmptyNameSet FreeVars
    fwds
        used_later :: FreeVars
    used_later = FreeVars
    defs FreeVars -> FreeVars -> FreeVars
    `intersectNameSet` FreeVars
    later_uses
                                    -- The ones needed after the RecStmt

    {-
    ************************************************************************
    *                                                                      *
    ApplicativeDo
    *                                                                      *
    ************************************************************************

    Note [ApplicativeDo]
    ~~~~~~~~~~~~~~~~~~~~
    = Example =

    For a sequence of statements

     do
         x <- A
         y <- B x
         z <- C
         return (f x y z)

    We want to transform this to

      (\(x,y) z -> f x y z) <$> (do x <- A; y <- B x; return (x,y)) <*> C

    It would be easy to notice that "y <- B x" and "z <- C" are
    independent and do something like this:

     do
         x <- A
         (y,z) <- (,) <$> B x <*> C
         return (f x y z)

    But this isn't enough! If A and C were also independent, then this
    transformation loses the ability to do A and C in parallel.

    The algorithm works by first splitting the sequence of statements into
    independent "segments", and a separate "tail" (the final statement). In
    our example above, the segments would be

         [ x <- A
         , y <- B x ]

         [ z <- C ]

    and the tail is:

         return (f x y z)

    Then we take these segments and make an Applicative expression from them:

         (\(x,y) z -> return (f x y z))
           <$> do { x <- A; y <- B x; return (x,y) }
           <*> C

    Finally, we recursively apply the transformation to each segment, to
    discover any nested parallelism.

    = Syntax & spec =

      expr ::= ... | do {stmt_1; ..; stmt_n} expr | ...

      stmt ::= pat <- expr
             | (arg_1 | ... | arg_n)  -- applicative composition, n>=1
             | ...                    -- other kinds of statement (e.g. let)

      arg ::= pat <- expr
            | {stmt_1; ..; stmt_n} {var_1..var_n}

    (note that in the actual implementation,the expr in a do statement is
    represented by a LastStmt as the final stmt, this is just a
    representational issue and may change later.)

    == Transformation to introduce applicative stmts ==

    ado {} tail = tail
    ado {pat <- expr} {return expr'} = (mkArg(pat <- expr)); return expr'
    ado {one} tail = one : tail
    ado stmts tail
      | n == 1 = ado before (ado after tail)
        where (before,after) = split(stmts_1)
      | n > 1  = (mkArg(stmts_1) | ... | mkArg(stmts_n)); tail
      where
        {stmts_1 .. stmts_n} = segments(stmts)

    segments(stmts) =
      -- divide stmts into segments with no interdependencies

    mkArg({pat <- expr}) = (pat <- expr)
    mkArg({stmt_1; ...; stmt_n}) =
      {stmt_1; ...; stmt_n} {vars(stmt_1) u .. u vars(stmt_n)}

    split({stmt_1; ..; stmt_n) =
      ({stmt_1; ..; stmt_i}, {stmt_i+1; ..; stmt_n})
      -- 1 <= i <= n
      -- i is a good place to insert a bind

    == Desugaring for do ==

    dsDo {} expr = expr

    dsDo {pat <- rhs; stmts} expr =
       rhs >>= \pat -> dsDo stmts expr

    dsDo {(arg_1 | ... | arg_n)} (return expr) =
      (\argpat (arg_1) .. argpat(arg_n) -> expr)
         <$> argexpr(arg_1)
         <*> ...
         <*> argexpr(arg_n)

    dsDo {(arg_1 | ... | arg_n); stmts} expr =
      join (\argpat (arg_1) .. argpat(arg_n) -> dsDo stmts expr)
         <$> argexpr(arg_1)
         <*> ...
         <*> argexpr(arg_n)

    == Special cases ==

    If a do-expression contains only "return E" or "return $ E" plus
    zero or more let-statements, we replace the "return" with "pure".
    See Section 3.6 of the paper.

    = Relevant modules in the rest of the compiler =

    ApplicativeDo touches a few phases in the compiler:

    * Renamer: The journey begins here in the renamer, where do-blocks are
      scheduled as outlined above and transformed into applicative
      combinators.  However, the code is still represented as a do-block
      with special forms of applicative statements. This allows us to
      recover the original do-block when e.g. printing type errors, where
      we don't want to show any of the applicative combinators since they
      don't exist in the source code.
      See ApplicativeStmt and ApplicativeArg in HsExpr.

    * Typechecker: ApplicativeDo passes through the typechecker much like any
      other form of expression. The only crux is that the typechecker has to
      be aware of the special ApplicativeDo statements in the do-notation, and
      typecheck them appropriately.
      Relevant module: GHC.Tc.Gen.Match

    * Desugarer: Any do-block which contains applicative statements is desugared
      as outlined above, to use the Applicative combinators.
      Relevant module: GHC.HsToCore.Expr

    -}

    -- | The 'Name's of @return@ and @pure@. These may not be 'returnName' and
    -- 'pureName' due to @QualifiedDo@ or @RebindableSyntax@.
    data MonadNames = MonadNames { MonadNames -> Name
    return_name, MonadNames -> Name
    pure_name :: Name }

    instance Outputable MonadNames where
      ppr :: MonadNames -> SDoc
    ppr (MonadNames {return_name :: MonadNames -> Name
    return_name=Name
    return_name,pure_name :: MonadNames -> Name
    pure_name=Name
    pure_name}) =
        [SDoc] -> SDoc
    forall doc. IsLine doc => [doc] -> doc
    hcat
        [String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "MonadNames { return_name = "
        ,Name -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Name
    return_name
        ,String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    ", pure_name = "
        ,Name -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Name
    pure_name
        ,String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "}"
        ]

    -- | rearrange a list of statements using ApplicativeDoStmt.  See
    -- Note [ApplicativeDo].
    rearrangeForApplicativeDo
      :: HsDoFlavour
      -> [(ExprLStmt GhcRn, FreeVars)]
      -> RnM ([ExprLStmt GhcRn], FreeVars)

    rearrangeForApplicativeDo :: HsDoFlavour
    -> [(ExprLStmt GhcRn, FreeVars)]
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    rearrangeForApplicativeDo HsDoFlavour
    _ [] = ([GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
     FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
          FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([], FreeVars
    emptyNameSet)
    -- If the do-block contains a single @return@ statement, change it to
    -- @pure@ if ApplicativeDo is turned on. See Note [ApplicativeDo].
    rearrangeForApplicativeDo HsDoFlavour
    ctxt [(ExprLStmt GhcRn
    one,FreeVars
    _)] = do
      (return_name, _) <- HsStmtContext Any -> Name -> RnM (Name, FreeVars)
    forall fn. HsStmtContext fn -> Name -> RnM (Name, FreeVars)
    lookupQualifiedDoName (HsDoFlavour -> HsStmtContext Any
    forall fn. HsDoFlavour -> HsStmtContext fn
    HsDoStmt HsDoFlavour
    ctxt) Name
    returnMName
      (pure_name, _)   <- lookupQualifiedDoName (HsDoStmt ctxt) pureAName
      let pure_expr = IdP GhcRn -> HsExpr GhcRn
    forall (p :: Pass) a.
    IsSrcSpanAnn p a =>
    IdP (GhcPass p) -> HsExpr (GhcPass p)
    nl_HsVar IdP GhcRn
    Name
    pure_name
      let monad_names = MonadNames { return_name :: Name
    return_name = Name
    return_name
                                   , pure_name :: Name
    pure_name   = Name
    pure_name }
      return $ case needJoin monad_names [one] (Just pure_expr) of
        (Bool
    False, [ExprLStmt GhcRn]
    one') -> ([ExprLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    one', FreeVars
    emptyNameSet)
        (Bool
    True, [ExprLStmt GhcRn]
    _) -> ([ExprLStmt GhcRn
    GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    one], FreeVars
    emptyNameSet)
    rearrangeForApplicativeDo HsDoFlavour
    ctxt [(ExprLStmt GhcRn, FreeVars)]
    stmts0 = do
      optimal_ado <- GeneralFlag -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. GeneralFlag -> TcRnIf gbl lcl Bool
    goptM GeneralFlag
    Opt_OptimalApplicativeDo
      let stmt_tree | Bool
    optimal_ado = [(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeOptimal [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts
                    | Bool
    otherwise = [(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeHeuristic [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts
      traceRn "rearrangeForADo" (ppr stmt_tree)
      (return_name, _) <- lookupQualifiedDoName (HsDoStmt ctxt) returnMName
      (pure_name, _)   <- lookupQualifiedDoName (HsDoStmt ctxt) pureAName
      let monad_names = MonadNames { return_name :: Name
    return_name = Name
    return_name
                                   , pure_name :: Name
    pure_name   = Name
    pure_name }
      stmtTreeToStmts monad_names ctxt stmt_tree [last] last_fvs
      where
        ([(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts,(GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    last,FreeVars
    last_fvs)) = [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> ([(GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)],
        (GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars))
    forall {a}. [a] -> ([a], a)
    findLast [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts0
        findLast :: [a] -> ([a], a)
    findLast [] = String -> ([a], a)
    forall a. HasCallStack => String -> a
    error String
    "findLast"
        findLast [a
    last] = ([],a
    last)
        findLast (a
    x:[a]
    xs) = (a
    xa -> [a] -> [a]
    forall a. a -> [a] -> [a]
    :[a]
    rest,a
    last) where ([a]
    rest,a
    last) = [a] -> ([a], a)
    findLast [a]
    xs

    -- | A tree of statements using a mixture of applicative and bind constructs.
    data StmtTree a
      = StmtTreeOne a
      | StmtTreeBind (StmtTree a) (StmtTree a)
      | StmtTreeApplicative [StmtTree a]

    instance Outputable a => Outputable (StmtTree a) where
      ppr :: StmtTree a -> SDoc
    ppr (StmtTreeOne a
    x)          = SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc
    parens (String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "StmtTreeOne" SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <+> a -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr a
    x)
      ppr (StmtTreeBind StmtTree a
    x StmtTree a
    y)       = SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc
    parens (SDoc -> Int -> SDoc -> SDoc
    hang (String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "StmtTreeBind")
                                                Int
    2 ([SDoc] -> SDoc
    forall doc. IsLine doc => [doc] -> doc
    sep [StmtTree a -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr StmtTree a
    x, StmtTree a -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr StmtTree a
    y]))
      ppr (StmtTreeApplicative [StmtTree a]
    xs) = SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc
    parens (SDoc -> Int -> SDoc -> SDoc
    hang (String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "StmtTreeApplicative")
                                                Int
    2 ([SDoc] -> SDoc
    forall doc. IsDoc doc => [doc] -> doc
    vcat ((StmtTree a -> SDoc) -> [StmtTree a] -> [SDoc]
    forall a b. (a -> b) -> [a] -> [b]
    map StmtTree a -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr [StmtTree a]
    xs)))

    flattenStmtTree :: StmtTree a -> [a]
    flattenStmtTree :: forall a. StmtTree a -> [a]
    flattenStmtTree StmtTree a
    t = StmtTree a -> [a] -> [a]
    forall {a}. StmtTree a -> [a] -> [a]
    go StmtTree a
    t []
     where
      go :: StmtTree a -> [a] -> [a]
    go (StmtTreeOne a
    a) [a]
    as = a
    a a -> [a] -> [a]
    forall a. a -> [a] -> [a]
    : [a]
    as
      go (StmtTreeBind StmtTree a
    l StmtTree a
    r) [a]
    as = StmtTree a -> [a] -> [a]
    go StmtTree a
    l (StmtTree a -> [a] -> [a]
    go StmtTree a
    r [a]
    as)
      go (StmtTreeApplicative [StmtTree a]
    ts) [a]
    as = (StmtTree a -> [a] -> [a]) -> [a] -> [StmtTree a] -> [a]
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr StmtTree a -> [a] -> [a]
    go [a]
    as [StmtTree a]
    ts

    type ExprStmtTree = StmtTree (ExprLStmt GhcRn, FreeVars)
    type Cost = Int

    -- | Turn a sequence of statements into an ExprStmtTree using a
    -- heuristic algorithm.  /O(n^2)/
    mkStmtTreeHeuristic :: [(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeHeuristic :: [(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeHeuristic [(ExprLStmt GhcRn, FreeVars)
    one] = (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (ExprLStmt GhcRn, FreeVars)
    (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    one
    mkStmtTreeHeuristic [(ExprLStmt GhcRn, FreeVars)]
    stmts =
      case [(ExprLStmt GhcRn, FreeVars)] -> [[(ExprLStmt GhcRn, FreeVars)]]
    segments [(ExprLStmt GhcRn, FreeVars)]
    stmts of
        [[(ExprLStmt GhcRn, FreeVars)]
    one] -> [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    split [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    one
        [[(ExprLStmt GhcRn, FreeVars)]]
    segs -> [StmtTree
       (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)]
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. [StmtTree a] -> StmtTree a
    StmtTreeApplicative (([(GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)]
     -> StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars))
    -> [[(GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    -> [StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars)]
    forall a b. (a -> b) -> [a] -> [b]
    map [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    split [[(ExprLStmt GhcRn, FreeVars)]]
    [[(GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)]]
    segs)
     where
      split :: [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    split [(GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    one] = (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    one
      split [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts =
        StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. StmtTree a -> StmtTree a -> StmtTree a
    StmtTreeBind ([(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeHeuristic [(ExprLStmt GhcRn, FreeVars)]
    before) ([(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeHeuristic [(ExprLStmt GhcRn, FreeVars)]
    after)
        where ([(ExprLStmt GhcRn, FreeVars)]
    before, [(ExprLStmt GhcRn, FreeVars)]
    after) = [(ExprLStmt GhcRn, FreeVars)]
    -> ([(ExprLStmt GhcRn, FreeVars)], [(ExprLStmt GhcRn, FreeVars)])
    splitSegment [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts

    -- | Turn a sequence of statements into an ExprStmtTree optimally,
    -- using dynamic programming.  /O(n^3)/
    mkStmtTreeOptimal :: [(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeOptimal :: [(ExprLStmt GhcRn, FreeVars)] -> ExprStmtTree
    mkStmtTreeOptimal [(ExprLStmt GhcRn, FreeVars)]
    stmts =
      Bool -> ExprStmtTree -> ExprStmtTree
    forall a. HasCallStack => Bool -> a -> a
    assert (Bool -> Bool
    not ([(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts)) (ExprStmtTree -> ExprStmtTree) -> ExprStmtTree -> ExprStmtTree
    forall a b. (a -> b) -> a -> b
    $ -- the empty case is handled by the caller;
                                  -- we don't support empty StmtTrees.
      (StmtTree
       (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars),
     Int)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a b. (a, b) -> a
    fst (Array (Int, Int) (ExprStmtTree, Int)
    Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    arr Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    -> (Int, Int)
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    forall i e. Ix i => Array i e -> i -> e
    ! (Int
    0,Int
    n))
      where
        n :: Int
    n = [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> Int
    forall a. [a] -> Int
    forall (t :: * -> *) a. Foldable t => t a -> Int
    length [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts Int -> Int -> Int
    forall a. Num a => a -> a -> a
    - Int
    1
        stmt_arr :: Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr = (Int, Int)
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> Array
         Int
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall i e. Ix i => (i, i) -> [e] -> Array i e
    listArray (Int
    0,Int
    n) [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts

        -- lazy cache of optimal trees for subsequences of the input
        arr :: Array (Int,Int) (ExprStmtTree, Cost)
        arr :: Array (Int, Int) (ExprStmtTree, Int)
    arr = ((Int, Int), (Int, Int))
    -> [((Int, Int),
         (StmtTree
            (GenLocated
               SrcSpanAnnA
               (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
             FreeVars),
          Int))]
    -> Array
         (Int, Int)
         (StmtTree
            (GenLocated
               SrcSpanAnnA
               (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
             FreeVars),
          Int)
    forall i e. Ix i => (i, i) -> [(i, e)] -> Array i e
    array ((Int
    0,Int
    0),(Int
    n,Int
    n))
                 [ ((Int
    lo,Int
    hi), Int
    -> Int
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    tree Int
    lo Int
    hi)
                 | Int
    lo <- [Int
    0..Int
    n]
                 , Int
    hi <- [Int
    lo..Int
    n] ]

        -- compute the optimal tree for the sequence [lo..hi]
        tree :: Int
    -> Int
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    tree Int
    lo Int
    hi
          | Int
    hi Int -> Int -> Bool
    forall a. Eq a => a -> a -> Bool
    == Int
    lo = ((GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> Int
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    forall i e. Ix i => Array i e -> i -> e
    ! Int
    lo), Int
    1)
          | Bool
    otherwise =
             case [(ExprLStmt GhcRn, FreeVars)] -> [[(ExprLStmt GhcRn, FreeVars)]]
    segments [ Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> Int
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    forall i e. Ix i => Array i e -> i -> e
    ! Int
    i | Int
    i <- [Int
    lo..Int
    hi] ] of
               [] -> String
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    forall a. HasCallStack => String -> a
    panic String
    "mkStmtTree"
               [[(ExprLStmt GhcRn, FreeVars)]
    _one] -> Int -> Int -> (ExprStmtTree, Int)
    split Int
    lo Int
    hi
               [[(ExprLStmt GhcRn, FreeVars)]]
    segs -> ([StmtTree
       (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)]
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. [StmtTree a] -> StmtTree a
    StmtTreeApplicative [StmtTree
       (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)]
    trees, [Int] -> Int
    forall a. Ord a => [a] -> a
    forall (t :: * -> *) a. (Foldable t, Ord a) => t a -> a
    maximum [Int]
    costs)
                 where
                   bounds :: [(Int, Int)]
    bounds = ((Int, Int)
     -> [(GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]
     -> (Int, Int))
    -> (Int, Int)
    -> [[(GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    -> [(Int, Int)]
    forall b a. (b -> a -> b) -> b -> [a] -> [b]
    scanl (\(Int
    _,Int
    hi) [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    a -> (Int
    hiInt -> Int -> Int
    forall a. Num a => a -> a -> a
    +Int
    1, Int
    hi Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> Int
    forall a. [a] -> Int
    forall (t :: * -> *) a. Foldable t => t a -> Int
    length [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    a)) (Int
    0,Int
    loInt -> Int -> Int
    forall a. Num a => a -> a -> a
    -Int
    1) [[(ExprLStmt GhcRn, FreeVars)]]
    [[(GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)]]
    segs
                   ([StmtTree
       (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)]
    trees,[Int]
    costs) = [(StmtTree
        (GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars),
      Int)]
    -> ([StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars)],
        [Int])
    forall a b. [(a, b)] -> ([a], [b])
    unzip (((Int, Int)
     -> (StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int))
    -> [(Int, Int)]
    -> [(StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int)]
    forall a b. (a -> b) -> [a] -> [b]
    map ((Int
     -> Int
     -> (StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int))
    -> (Int, Int)
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    forall a b c. (a -> b -> c) -> (a, b) -> c
    uncurry Int -> Int -> (ExprStmtTree, Int)
    Int
    -> Int
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    split) ([(Int, Int)] -> [(Int, Int)]
    forall a. HasCallStack => [a] -> [a]
    tail [(Int, Int)]
    bounds))

        -- find the best place to split the segment [lo..hi]
        split :: Int -> Int -> (ExprStmtTree, Cost)
        split :: Int -> Int -> (ExprStmtTree, Int)
    split Int
    lo Int
    hi
          | Int
    hi Int -> Int -> Bool
    forall a. Eq a => a -> a -> Bool
    == Int
    lo = ((GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> Int
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    forall i e. Ix i => Array i e -> i -> e
    ! Int
    lo), Int
    1)
          | Bool
    otherwise = (StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. StmtTree a -> StmtTree a -> StmtTree a
    StmtTreeBind StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    before StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    after, Int
    c1Int -> Int -> Int
    forall a. Num a => a -> a -> a
    +Int
    c2)
            where
             -- As per the paper, for a sequence s1...sn, we want to find
             -- the split with the minimum cost, where the cost is the
             -- sum of the cost of the left and right subsequences.
             --
             -- As an optimisation (also in the paper) if the cost of
             -- s1..s(n-1) is different from the cost of s2..sn, we know
             -- that the optimal solution is the lower of the two.  Only
             -- in the case that these two have the same cost do we need
             -- to do the exhaustive search.
             --
             ((StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    before,Int
    c1),(StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    after,Int
    c2))
               | Int
    hi Int -> Int -> Int
    forall a. Num a => a -> a -> a
    - Int
    lo Int -> Int -> Bool
    forall a. Eq a => a -> a -> Bool
    == Int
    1
               = (((GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> Int
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    forall i e. Ix i => Array i e -> i -> e
    ! Int
    lo), Int
    1),
                  ((GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> Int
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    forall i e. Ix i => Array i e -> i -> e
    ! Int
    hi), Int
    1))
               | Int
    left_cost Int -> Int -> Bool
    forall a. Ord a => a -> a -> Bool
    < Int
    right_cost
               = ((StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    left,Int
    left_cost), ((GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> Int
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    forall i e. Ix i => Array i e -> i -> e
    ! Int
    hi), Int
    1))
               | Int
    left_cost Int -> Int -> Bool
    forall a. Ord a => a -> a -> Bool
    > Int
    right_cost
               = (((GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    forall a. a -> StmtTree a
    StmtTreeOne (Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    stmt_arr Array
      Int
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> Int
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    forall i e. Ix i => Array i e -> i -> e
    ! Int
    lo), Int
    1), (StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    right,Int
    right_cost))
               | Bool
    otherwise = (((StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int),
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int))
     -> ((StmtTree
            (GenLocated
               SrcSpanAnnA
               (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
             FreeVars),
          Int),
         (StmtTree
            (GenLocated
               SrcSpanAnnA
               (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
             FreeVars),
          Int))
     -> Ordering)
    -> [((StmtTree
            (GenLocated
               SrcSpanAnnA
               (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
             FreeVars),
          Int),
         (StmtTree
            (GenLocated
               SrcSpanAnnA
               (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
             FreeVars),
          Int))]
    -> ((StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int),
        (StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int))
    forall (t :: * -> *) a.
    Foldable t =>
    (a -> a -> Ordering) -> t a -> a
    minimumBy ((((StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int),
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int))
     -> Int)
    -> ((StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int),
        (StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int))
    -> ((StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int),
        (StmtTree
           (GenLocated
              SrcSpanAnnA
              (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
            FreeVars),
         Int))
    -> Ordering
    forall a b. Ord a => (b -> a) -> b -> b -> Ordering
    comparing ((StmtTree
        (GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars),
      Int),
     (StmtTree
        (GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars),
      Int))
    -> Int
    forall {a} {a} {a}. Num a => ((a, a), (a, a)) -> a
    cost) [((StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int),
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int))]
    alternatives
               where
                 (StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    left, Int
    left_cost) = Array (Int, Int) (ExprStmtTree, Int)
    Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    arr Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    -> (Int, Int)
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    forall i e. Ix i => Array i e -> i -> e
    ! (Int
    lo,Int
    hiInt -> Int -> Int
    forall a. Num a => a -> a -> a
    -Int
    1)
                 (StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    right, Int
    right_cost) = Array (Int, Int) (ExprStmtTree, Int)
    Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    arr Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    -> (Int, Int)
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    forall i e. Ix i => Array i e -> i -> e
    ! (Int
    loInt -> Int -> Int
    forall a. Num a => a -> a -> a
    +Int
    1,Int
    hi)
                 cost :: ((a, a), (a, a)) -> a
    cost ((a
    _,a
    c1),(a
    _,a
    c2)) = a
    c1 a -> a -> a
    forall a. Num a => a -> a -> a
    + a
    c2
                 alternatives :: [((StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int),
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int))]
    alternatives = [ (Array (Int, Int) (ExprStmtTree, Int)
    Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    arr Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    -> (Int, Int)
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    forall i e. Ix i => Array i e -> i -> e
    ! (Int
    lo,Int
    k), Array (Int, Int) (ExprStmtTree, Int)
    Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    arr Array
      (Int, Int)
      (StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars),
       Int)
    -> (Int, Int)
    -> (StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars),
        Int)
    forall i e. Ix i => Array i e -> i -> e
    ! (Int
    kInt -> Int -> Int
    forall a. Num a => a -> a -> a
    +Int
    1,Int
    hi))
                                | Int
    k <- [Int
    lo .. Int
    hiInt -> Int -> Int
    forall a. Num a => a -> a -> a
    -Int
    1] ]

    -- | Turn the ExprStmtTree back into a sequence of statements, using
    -- ApplicativeStmt where necessary.
    stmtTreeToStmts
      :: MonadNames
      -> HsDoFlavour
      -> ExprStmtTree
      -> [ExprLStmt GhcRn]             -- ^ the "tail"
      -> FreeVars                     -- ^ free variables of the tail
      -> RnM ( [ExprLStmt GhcRn]       -- ( output statements,
             , FreeVars )             -- , things we needed

    -- If we have a single bind, and we can do it without a join, transform
    -- to an ApplicativeStmt.  This corresponds to the rule
    --   dsBlock [pat <- rhs] (return expr) = expr <$> rhs
    -- In the spec, but we do it here rather than in the desugarer,
    -- because we need the typechecker to typecheck the <$> form rather than
    -- the bind form, which would give rise to a Monad constraint.
    --
    -- If we have a single let, and the last statement is @return E@ or @return $ E@,
    -- change the @return@ to @pure@.
    stmtTreeToStmts :: MonadNames
    -> HsDoFlavour
    -> ExprStmtTree
    -> [ExprLStmt GhcRn]
    -> FreeVars
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    stmtTreeToStmts MonadNames
    monad_names HsDoFlavour
    ctxt (StmtTreeOne (L SrcSpanAnnA
    _ (BindStmt XBindStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    xbs LPat GhcRn
    pat GenLocated SrcSpanAnnA (HsExpr GhcRn)
    rhs), FreeVars
    _))
                    [ExprLStmt GhcRn]
    tail FreeVars
    _tail_fvs
      | Bool -> Bool
    not (LPat GhcRn -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern LPat GhcRn
    pat), (Bool
    False,[ExprLStmt GhcRn]
    tail') <- MonadNames
    -> [ExprLStmt GhcRn]
    -> Maybe (HsExpr GhcRn)
    -> (Bool, [ExprLStmt GhcRn])
    needJoin MonadNames
    monad_names [ExprLStmt GhcRn]
    tail Maybe (HsExpr GhcRn)
    forall a. Maybe a
    Nothing
      -- See Note [ApplicativeDo and strict patterns]
      = HsDoFlavour
    -> [ApplicativeArg GhcRn]
    -> Bool
    -> [ExprLStmt GhcRn]
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    mkApplicativeStmt HsDoFlavour
    ctxt [ApplicativeArgOne
                                { xarg_app_arg_one :: XApplicativeArgOne GhcRn
    xarg_app_arg_one = XBindStmtRn -> Maybe (SyntaxExpr GhcRn)
    xbsrn_failOp XBindStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    XBindStmtRn
    xbs
                                , app_arg_pattern :: LPat GhcRn
    app_arg_pattern  = LPat GhcRn
    pat
                                , arg_expr :: XRec GhcRn (HsExpr GhcRn)
    arg_expr         = XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    rhs
                                , is_body_stmt :: Bool
    is_body_stmt     = Bool
    False
                                }]
                          Bool
    False [ExprLStmt GhcRn]
    tail'
    stmtTreeToStmts MonadNames
    monad_names HsDoFlavour
    ctxt (StmtTreeOne (L SrcSpanAnnA
    _ (BodyStmt XBodyStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    _ GenLocated SrcSpanAnnA (HsExpr GhcRn)
    rhs SyntaxExpr GhcRn
    _ SyntaxExpr GhcRn
    _),FreeVars
    _))
                    [ExprLStmt GhcRn]
    tail FreeVars
    _tail_fvs
      | (Bool
    False,[ExprLStmt GhcRn]
    tail') <- MonadNames
    -> [ExprLStmt GhcRn]
    -> Maybe (HsExpr GhcRn)
    -> (Bool, [ExprLStmt GhcRn])
    needJoin MonadNames
    monad_names [ExprLStmt GhcRn]
    tail Maybe (HsExpr GhcRn)
    forall a. Maybe a
    Nothing
      = HsDoFlavour
    -> [ApplicativeArg GhcRn]
    -> Bool
    -> [ExprLStmt GhcRn]
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    mkApplicativeStmt HsDoFlavour
    ctxt
          [ApplicativeArgOne
           { xarg_app_arg_one :: XApplicativeArgOne GhcRn
    xarg_app_arg_one = Maybe SyntaxExprRn
    XApplicativeArgOne GhcRn
    forall a. Maybe a
    Nothing
           , app_arg_pattern :: LPat GhcRn
    app_arg_pattern  = LPat GhcRn
    nlWildPatName
           , arg_expr :: XRec GhcRn (HsExpr GhcRn)
    arg_expr         = XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    rhs
           , is_body_stmt :: Bool
    is_body_stmt     = Bool
    True
           }] Bool
    False [ExprLStmt GhcRn]
    tail'
    stmtTreeToStmts MonadNames
    monad_names HsDoFlavour
    ctxt (StmtTreeOne (let_stmt :: ExprLStmt GhcRn
    let_stmt@(L SrcSpanAnnA
    _ LetStmt{}),FreeVars
    _))
                    [ExprLStmt GhcRn]
    tail FreeVars
    _tail_fvs = do
      (pure_expr, _) <- HsStmtContext Any -> Name -> TcM (HsExpr GhcRn, FreeVars)
    forall fn. HsStmtContext fn -> Name -> TcM (HsExpr GhcRn, FreeVars)
    lookupQualifiedDoExpr (HsDoFlavour -> HsStmtContext Any
    forall fn. HsDoFlavour -> HsStmtContext fn
    HsDoStmt HsDoFlavour
    ctxt) Name
    pureAName
      return $ case needJoin monad_names tail (Just pure_expr) of
        (Bool
    False, [ExprLStmt GhcRn]
    tail') -> (ExprLStmt GhcRn
    GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    let_stmt GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> [GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    -> [GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    forall a. a -> [a] -> [a]
    : [ExprLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    tail', FreeVars
    emptyNameSet)
        (Bool
    True, [ExprLStmt GhcRn]
    _) -> (ExprLStmt GhcRn
    GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    let_stmt GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> [GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    -> [GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    forall a. a -> [a] -> [a]
    : [ExprLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    tail, FreeVars
    emptyNameSet)

    stmtTreeToStmts MonadNames
    _monad_names HsDoFlavour
    _ctxt (StmtTreeOne (ExprLStmt GhcRn
    s,FreeVars
    _)) [ExprLStmt GhcRn]
    tail FreeVars
    _tail_fvs =
      ([GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
     FreeVars)
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
          FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (ExprLStmt GhcRn
    GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    s GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> [GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    -> [GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    forall a. a -> [a] -> [a]
    : [ExprLStmt GhcRn]
    [GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    tail, FreeVars
    emptyNameSet)

    stmtTreeToStmts MonadNames
    monad_names HsDoFlavour
    ctxt (StmtTreeBind ExprStmtTree
    before ExprStmtTree
    after) [ExprLStmt GhcRn]
    tail FreeVars
    tail_fvs = do
      (stmts1, fvs1) <- MonadNames
    -> HsDoFlavour
    -> ExprStmtTree
    -> [ExprLStmt GhcRn]
    -> FreeVars
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    stmtTreeToStmts MonadNames
    monad_names HsDoFlavour
    ctxt ExprStmtTree
    after [ExprLStmt GhcRn]
    tail FreeVars
    tail_fvs
      let tail1_fvs = [FreeVars] -> FreeVars
    unionNameSets (FreeVars
    tail_fvs FreeVars -> [FreeVars] -> [FreeVars]
    forall a. a -> [a] -> [a]
    : ((GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)
     -> FreeVars)
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> [FreeVars]
    forall a b. (a -> b) -> [a] -> [b]
    map (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> FreeVars
    forall a b. (a, b) -> b
    snd (StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. StmtTree a -> [a]
    flattenStmtTree ExprStmtTree
    StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    after))
      (stmts2, fvs2) <- stmtTreeToStmts monad_names ctxt before stmts1 tail1_fvs
      return (stmts2, fvs1 `plusFV` fvs2)

    stmtTreeToStmts MonadNames
    monad_names HsDoFlavour
    ctxt (StmtTreeApplicative [ExprStmtTree]
    trees) [ExprLStmt GhcRn]
    tail FreeVars
    tail_fvs = do
       pairs <- (StmtTree
       (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
     -> IOEnv (Env TcGblEnv TcLclEnv) (ApplicativeArg GhcRn, FreeVars))
    -> [StmtTree
          (GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars)]
    -> IOEnv (Env TcGblEnv TcLclEnv) [(ApplicativeArg GhcRn, FreeVars)]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (HsDoFlavour
    -> FreeVars
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    -> IOEnv (Env TcGblEnv TcLclEnv) (ApplicativeArg GhcRn, FreeVars)
    stmtTreeArg HsDoFlavour
    ctxt FreeVars
    tail_fvs) [ExprStmtTree]
    [StmtTree
       (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)]
    trees
       dflags <- getDynFlags
       let (stmts', fvss) = unzip pairs
       let (need_join, tail') =
         -- See Note [ApplicativeDo and refutable patterns]
             if any (hasRefutablePattern dflags) stmts'
             then (True, tail)
             else needJoin monad_names tail Nothing

       (stmts, fvs) <- mkApplicativeStmt ctxt stmts' need_join tail'
       return (stmts, unionNameSets (fvs:fvss))
     where
       stmtTreeArg :: HsDoFlavour
    -> FreeVars
    -> StmtTree
         (GenLocated
            SrcSpanAnnA
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    -> IOEnv (Env TcGblEnv TcLclEnv) (ApplicativeArg GhcRn, FreeVars)
    stmtTreeArg HsDoFlavour
    _ctxt FreeVars
    _tail_fvs (StmtTreeOne (L SrcSpanAnnA
    _ (BindStmt XBindStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    xbs LPat GhcRn
    pat GenLocated SrcSpanAnnA (HsExpr GhcRn)
    exp), FreeVars
    _))
         = (ApplicativeArg GhcRn, FreeVars)
    -> IOEnv (Env TcGblEnv TcLclEnv) (ApplicativeArg GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (ApplicativeArgOne
                   { xarg_app_arg_one :: XApplicativeArgOne GhcRn
    xarg_app_arg_one = XBindStmtRn -> Maybe (SyntaxExpr GhcRn)
    xbsrn_failOp XBindStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    XBindStmtRn
    xbs
                   , app_arg_pattern :: LPat GhcRn
    app_arg_pattern  = LPat GhcRn
    pat
                   , arg_expr :: XRec GhcRn (HsExpr GhcRn)
    arg_expr         = XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    exp
                   , is_body_stmt :: Bool
    is_body_stmt     = Bool
    False
                   }, FreeVars
    emptyFVs)
       stmtTreeArg HsDoFlavour
    _ctxt FreeVars
    _tail_fvs (StmtTreeOne (L SrcSpanAnnA
    _ (BodyStmt XBodyStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    _ GenLocated SrcSpanAnnA (HsExpr GhcRn)
    exp SyntaxExpr GhcRn
    _ SyntaxExpr GhcRn
    _), FreeVars
    _)) =
         (ApplicativeArg GhcRn, FreeVars)
    -> IOEnv (Env TcGblEnv TcLclEnv) (ApplicativeArg GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (ApplicativeArgOne
                 { xarg_app_arg_one :: XApplicativeArgOne GhcRn
    xarg_app_arg_one = Maybe SyntaxExprRn
    XApplicativeArgOne GhcRn
    forall a. Maybe a
    Nothing
                 , app_arg_pattern :: LPat GhcRn
    app_arg_pattern  = LPat GhcRn
    nlWildPatName
                 , arg_expr :: XRec GhcRn (HsExpr GhcRn)
    arg_expr         = XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    exp
                 , is_body_stmt :: Bool
    is_body_stmt     = Bool
    True
                 }, FreeVars
    emptyFVs)
       stmtTreeArg HsDoFlavour
    ctxt FreeVars
    tail_fvs StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    tree = do
         let stmts :: [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts = StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. StmtTree a -> [a]
    flattenStmtTree StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    tree
             pvarset :: FreeVars
    pvarset = [Name] -> FreeVars
    mkNameSet (((GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)
     -> [Name])
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> [Name]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap (CollectFlag GhcRn
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> [IdP GhcRn]
    forall (idL :: Pass) (idR :: Pass) body.
    CollectPass (GhcPass idL) =>
    CollectFlag (GhcPass idL)
    -> StmtLR (GhcPass idL) (GhcPass idR) body -> [IdP (GhcPass idL)]
    collectStmtBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
     -> [Name])
    -> ((GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)
        -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    -> [Name]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    forall l e. GenLocated l e -> e
    unLoc (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
     -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> ((GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)
        -> GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    forall a b. (a, b) -> a
    fst) [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts)
                         FreeVars -> FreeVars -> FreeVars
    `intersectNameSet` FreeVars
    tail_fvs
             pvars :: [Name]
    pvars = FreeVars -> [Name]
    nameSetElemsStable FreeVars
    pvarset
               -- See Note [Deterministic ApplicativeDo and RecursiveDo desugaring]
             pat :: LPat GhcRn
    pat = [IdP GhcRn] -> LPat GhcRn
    mkBigLHsVarPatTup [IdP GhcRn]
    [Name]
    pvars
             tup :: XRec GhcRn (HsExpr GhcRn)
    tup = [IdP GhcRn] -> XExplicitTuple GhcRn -> XRec GhcRn (HsExpr GhcRn)
    forall (p :: Pass) a.
    IsSrcSpanAnn p a =>
    [IdP (GhcPass p)]
    -> XExplicitTuple (GhcPass p) -> LHsExpr (GhcPass p)
    mkBigLHsVarTup [IdP GhcRn]
    [Name]
    pvars XExplicitTuple GhcRn
    NoExtField
    noExtField
         (stmts',fvs2) <- MonadNames
    -> HsDoFlavour
    -> ExprStmtTree
    -> [ExprLStmt GhcRn]
    -> FreeVars
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    stmtTreeToStmts MonadNames
    monad_names HsDoFlavour
    ctxt ExprStmtTree
    StmtTree
      (GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)
    tree [] FreeVars
    pvarset
         (mb_ret, fvs1) <-
            if | L _ ApplicativeStmt{} <- last stmts' ->
                 return (unLoc tup, emptyNameSet)
               | otherwise -> do
                 -- Need 'pureAName' and not 'returnMName' here, so that it requires
                 -- 'Applicative' and not 'Monad' whenever possible (until #20540 is fixed).
                 (ret, _) <- lookupQualifiedDoExpr (HsDoStmt ctxt) pureAName
                 let expr = XApp GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XApp p -> LHsExpr p -> LHsExpr p -> HsExpr p
    HsApp XApp GhcRn
    NoExtField
    noExtField (HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall e a. HasAnnotation e => a -> GenLocated e a
    noLocA HsExpr GhcRn
    ret) XRec GhcRn (HsExpr GhcRn)
    tup
                 return (expr, emptyFVs)
         return ( ApplicativeArgMany
                  { xarg_app_arg_many = noExtField
                  , app_stmts         = stmts'
                  , final_expr        = mb_ret
                  , bv_pattern        = pat
                  , stmt_context      = ctxt
                  }
                , fvs1 `plusFV` fvs2)

    -- | Divide a sequence of statements into segments, where no segment
    -- depends on any variables defined by a statement in another segment.
    segments
      :: [(ExprLStmt GhcRn, FreeVars)]
      -> [[(ExprLStmt GhcRn, FreeVars)]]
    segments :: [(ExprLStmt GhcRn, FreeVars)] -> [[(ExprLStmt GhcRn, FreeVars)]]
    segments [(ExprLStmt GhcRn, FreeVars)]
    stmts = [[(GenLocated
         (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)]]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    forall {a :: Pass} {b} {b}.
    [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    -> [[(GenLocated
            (Anno (StmtLR (GhcPass a) (GhcPass a) b))
            (StmtLR (GhcPass a) (GhcPass a) b),
          b)]]
    merge ([[(GenLocated
          (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)]]
     -> [[(GenLocated
             (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars)]])
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    forall a b. (a -> b) -> a -> b
    $ [[(GenLocated
         (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)]]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    forall a. [a] -> [a]
    reverse ([[(GenLocated
          (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)]]
     -> [[(GenLocated
             (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars)]])
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    forall a b. (a -> b) -> a -> b
    $ ([(ExprLStmt GhcRn, FreeVars)]
     -> [(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)])
    -> [[(ExprLStmt GhcRn, FreeVars)]]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    forall a b. (a -> b) -> [a] -> [b]
    map [(ExprLStmt GhcRn, FreeVars)]
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. [a] -> [a]
    reverse ([[(ExprLStmt GhcRn, FreeVars)]]
     -> [[(GenLocated
             (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars)]])
    -> [[(ExprLStmt GhcRn, FreeVars)]]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    forall a b. (a -> b) -> a -> b
    $ [(ExprLStmt GhcRn, FreeVars)] -> [[(ExprLStmt GhcRn, FreeVars)]]
    walk ([(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. [a] -> [a]
    reverse [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts)
      where
        allvars :: FreeVars
    allvars = [Name] -> FreeVars
    mkNameSet (((GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)
     -> [Name])
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> [Name]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap (CollectFlag GhcRn
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> [IdP GhcRn]
    forall (idL :: Pass) (idR :: Pass) body.
    CollectPass (GhcPass idL) =>
    CollectFlag (GhcPass idL)
    -> StmtLR (GhcPass idL) (GhcPass idR) body -> [IdP (GhcPass idL)]
    collectStmtBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
     -> [Name])
    -> ((GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)
        -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    -> [Name]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . GenLocated
      SrcSpanAnnA
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    forall l e. GenLocated l e -> e
    unLoc (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
     -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> ((GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)
        -> GenLocated
             SrcSpanAnnA
             (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
    -> (GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
        FreeVars)
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (GenLocated
       SrcSpanAnnA
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    forall a b. (a, b) -> a
    fst) [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts)

        -- We would rather not have a segment that just has LetStmts in
        -- it, so combine those with the next segment where possible.
        -- We don't merge it with the previous segment because the merged segment
        -- would require 'Monad' while it may otherwise only require 'Applicative'.
        merge :: [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    -> [[(GenLocated
            (Anno (StmtLR (GhcPass a) (GhcPass a) b))
            (StmtLR (GhcPass a) (GhcPass a) b),
          b)]]
    merge [] = []
        merge ([(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    seg : [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    segs)
           = case [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    rest of
              [(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    s:[[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    ss | Bool
    all_lets -> ([(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    seg [(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    -> [(GenLocated
           (Anno (StmtLR (GhcPass a) (GhcPass a) b))
           (StmtLR (GhcPass a) (GhcPass a) b),
         b)]
    -> [(GenLocated
           (Anno (StmtLR (GhcPass a) (GhcPass a) b))
           (StmtLR (GhcPass a) (GhcPass a) b),
         b)]
    forall a. [a] -> [a] -> [a]
    ++ [(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    s) [(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    -> [[(GenLocated
            (Anno (StmtLR (GhcPass a) (GhcPass a) b))
            (StmtLR (GhcPass a) (GhcPass a) b),
          b)]]
    -> [[(GenLocated
            (Anno (StmtLR (GhcPass a) (GhcPass a) b))
            (StmtLR (GhcPass a) (GhcPass a) b),
          b)]]
    forall a. a -> [a] -> [a]
    : [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    ss
              [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    _otherwise -> [(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    seg [(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    -> [[(GenLocated
            (Anno (StmtLR (GhcPass a) (GhcPass a) b))
            (StmtLR (GhcPass a) (GhcPass a) b),
          b)]]
    -> [[(GenLocated
            (Anno (StmtLR (GhcPass a) (GhcPass a) b))
            (StmtLR (GhcPass a) (GhcPass a) b),
          b)]]
    forall a. a -> [a] -> [a]
    : [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    rest
          where
            rest :: [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    rest = [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    -> [[(GenLocated
            (Anno (StmtLR (GhcPass a) (GhcPass a) b))
            (StmtLR (GhcPass a) (GhcPass a) b),
          b)]]
    merge [[(GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b),
       b)]]
    segs
            all_lets :: Bool
    all_lets = ((GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)
     -> Bool)
    -> [(GenLocated
           (Anno (StmtLR (GhcPass a) (GhcPass a) b))
           (StmtLR (GhcPass a) (GhcPass a) b),
         b)]
    -> Bool
    forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
    all (LStmt (GhcPass a) b -> Bool
    GenLocated
      (Anno (StmtLR (GhcPass a) (GhcPass a) b))
      (StmtLR (GhcPass a) (GhcPass a) b)
    -> Bool
    forall (a :: Pass) b. LStmt (GhcPass a) b -> Bool
    isLetStmt (GenLocated
       (Anno (StmtLR (GhcPass a) (GhcPass a) b))
       (StmtLR (GhcPass a) (GhcPass a) b)
     -> Bool)
    -> ((GenLocated
           (Anno (StmtLR (GhcPass a) (GhcPass a) b))
           (StmtLR (GhcPass a) (GhcPass a) b),
         b)
        -> GenLocated
             (Anno (StmtLR (GhcPass a) (GhcPass a) b))
             (StmtLR (GhcPass a) (GhcPass a) b))
    -> (GenLocated
          (Anno (StmtLR (GhcPass a) (GhcPass a) b))
          (StmtLR (GhcPass a) (GhcPass a) b),
        b)
    -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (GenLocated
       (Anno (StmtLR (GhcPass a) (GhcPass a) b))
       (StmtLR (GhcPass a) (GhcPass a) b),
     b)
    -> GenLocated
         (Anno (StmtLR (GhcPass a) (GhcPass a) b))
         (StmtLR (GhcPass a) (GhcPass a) b)
    forall a b. (a, b) -> a
    fst) [(GenLocated
        (Anno (StmtLR (GhcPass a) (GhcPass a) b))
        (StmtLR (GhcPass a) (GhcPass a) b),
      b)]
    seg

        -- walk splits the statement sequence into segments, traversing
        -- the sequence from the back to the front, and keeping track of
        -- the set of free variables of the current segment.  Whenever
        -- this set of free variables is empty, we have a complete segment.
        walk :: [(ExprLStmt GhcRn, FreeVars)] -> [[(ExprLStmt GhcRn, FreeVars)]]
        walk :: [(ExprLStmt GhcRn, FreeVars)] -> [[(ExprLStmt GhcRn, FreeVars)]]
    walk [] = []
        walk ((ExprLStmt GhcRn
    stmt,FreeVars
    fvs) : [(ExprLStmt GhcRn, FreeVars)]
    stmts) = ((ExprLStmt GhcRn
    GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt,FreeVars
    fvs) (GenLocated
       (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. a -> [a] -> [a]
    : [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    seg) [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    -> [[(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)]]
    forall a. a -> [a] -> [a]
    : [(ExprLStmt GhcRn, FreeVars)] -> [[(ExprLStmt GhcRn, FreeVars)]]
    walk [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest
          where ([(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    seg,[(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest) = FreeVars
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> ([(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)],
        [(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)])
    chunter FreeVars
    fvs' [(ExprLStmt GhcRn, FreeVars)]
    [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    stmts
                (FreeVars
    _, FreeVars
    fvs') = GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> FreeVars -> (FreeVars, FreeVars)
    stmtRefs ExprLStmt GhcRn
    GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt FreeVars
    fvs

        chunter :: FreeVars
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> ([(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)],
        [(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)])
    chunter FreeVars
    _ [] = ([], [])
        chunter FreeVars
    vars ((GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt,FreeVars
    fvs) : [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest)
           | Bool -> Bool
    not (FreeVars -> Bool
    isEmptyNameSet FreeVars
    vars)
           Bool -> Bool -> Bool
    || ExprLStmt GhcRn -> Bool
    isStrictPatternBind ExprLStmt GhcRn
    GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt
               -- See Note [ApplicativeDo and strict patterns]
           = ((GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt,FreeVars
    fvs) (GenLocated
       (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
       (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
     FreeVars)
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. a -> [a] -> [a]
    : [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    chunk, [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest')
           where ([(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    chunk,[(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest') = FreeVars
    -> [(GenLocated
           (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> ([(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)],
        [(GenLocated
            (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
            (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)])
    chunter FreeVars
    vars' [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest
                 (FreeVars
    pvars, FreeVars
    evars) = GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> FreeVars -> (FreeVars, FreeVars)
    stmtRefs GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt FreeVars
    fvs
                 vars' :: FreeVars
    vars' = (FreeVars
    vars FreeVars -> FreeVars -> FreeVars
    `minusNameSet` FreeVars
    pvars) FreeVars -> FreeVars -> FreeVars
    `unionNameSet` FreeVars
    evars
        chunter FreeVars
    _ [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest = ([], [(GenLocated
        (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest)

        stmtRefs :: GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> FreeVars -> (FreeVars, FreeVars)
    stmtRefs GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt FreeVars
    fvs
          | LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)) -> Bool
    forall (a :: Pass) b. LStmt (GhcPass a) b -> Bool
    isLetStmt LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt = (FreeVars
    pvars, FreeVars
    fvs' FreeVars -> FreeVars -> FreeVars
    `minusNameSet` FreeVars
    pvars)
          | Bool
    otherwise      = (FreeVars
    pvars, FreeVars
    fvs')
          where fvs' :: FreeVars
    fvs' = FreeVars
    fvs FreeVars -> FreeVars -> FreeVars
    `intersectNameSet` FreeVars
    allvars
                pvars :: FreeVars
    pvars = [Name] -> FreeVars
    mkNameSet (CollectFlag GhcRn
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> [IdP GhcRn]
    forall (idL :: Pass) (idR :: Pass) body.
    CollectPass (GhcPass idL) =>
    CollectFlag (GhcPass idL)
    -> StmtLR (GhcPass idL) (GhcPass idR) body -> [IdP (GhcPass idL)]
    collectStmtBinders CollectFlag GhcRn
    forall p. CollectFlag p
    CollNoDictBinders (GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    forall l e. GenLocated l e -> e
    unLoc GenLocated
      (Anno (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
      (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    stmt))

        isStrictPatternBind :: ExprLStmt GhcRn -> Bool
        isStrictPatternBind :: ExprLStmt GhcRn -> Bool
    isStrictPatternBind (L SrcSpanAnnA
    _ (BindStmt XBindStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    _ LPat GhcRn
    pat GenLocated SrcSpanAnnA (HsExpr GhcRn)
    _)) = LPat GhcRn -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern LPat GhcRn
    pat
        isStrictPatternBind ExprLStmt GhcRn
    _ = Bool
    False

    {-
    Note [ApplicativeDo and strict patterns]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    A strict pattern match is really a dependency.  For example,

    do
      (x,y) <- A
      z <- B
      return C

    The pattern (_,_) must be matched strictly before we do B.  If we
    allowed this to be transformed into

      (\(x,y) -> \z -> C) <$> A <*> B

    then it could be lazier than the standard desugaring using >>=.  See #13875
    for more examples.

    Thus, whenever we have a strict pattern match, we treat it as a
    dependency between that statement and the following one.  The
    dependency prevents those two statements from being performed "in
    parallel" in an ApplicativeStmt, but doesn't otherwise affect what we
    can do with the rest of the statements in the same "do" expression.
    -}

    isStrictPattern :: forall p. IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern :: forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern (L SrcSpanAnnA
    loc Pat (GhcPass p)
    pat) =
      case Pat (GhcPass p)
    pat of
        WildPat{}       -> Bool
    False
        VarPat{}        -> Bool
    False
        LazyPat{}       -> Bool
    False
        AsPat XAsPat (GhcPass p)
    _ LIdP (GhcPass p)
    _ LPat (GhcPass p)
    p     -> LPat (GhcPass p) -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern LPat (GhcPass p)
    p
        ParPat XParPat (GhcPass p)
    _ LPat (GhcPass p)
    p      -> LPat (GhcPass p) -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern LPat (GhcPass p)
    p
        ViewPat XViewPat (GhcPass p)
    _ LHsExpr (GhcPass p)
    _ LPat (GhcPass p)
    p   -> LPat (GhcPass p) -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern LPat (GhcPass p)
    p
        SigPat XSigPat (GhcPass p)
    _ LPat (GhcPass p)
    p HsPatSigType (NoGhcTc (GhcPass p))
    _    -> LPat (GhcPass p) -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern LPat (GhcPass p)
    p
        BangPat{}       -> Bool
    True
        ListPat{}       -> Bool
    True
        TuplePat{}      -> Bool
    True
        SumPat{}        -> Bool
    True
        ConPat{}        -> Bool
    True
        LitPat{}        -> Bool
    True
        NPat{}          -> Bool
    True
        NPlusKPat{}     -> Bool
    True
        SplicePat{}     -> Bool
    True

        -- The behavior of this case is unimportant, as GHC will throw an error shortly
        -- after reaching this case for other reasons (see TcRnIllegalTypePattern).
        EmbTyPat{}  -> Bool
    False
        InvisPat{}  -> Bool
    False

        XPat XXPat (GhcPass p)
    ext        -> case forall (p :: Pass). IsPass p => GhcPass p
    ghcPass @p of
          GhcPass p
    GhcRn
            | HsPatExpanded Pat GhcRn
    _ Pat GhcRn
    p <- XXPat (GhcPass p)
    ext
            -> LPat GhcRn -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern (SrcSpanAnnA -> Pat GhcRn -> GenLocated SrcSpanAnnA (Pat GhcRn)
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc Pat GhcRn
    p)
          GhcPass p
    GhcTc -> case XXPat (GhcPass p)
    ext of
            ExpansionPat Pat GhcRn
    _ Pat GhcTc
    p -> LPat GhcTc -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern (SrcSpanAnnA -> Pat GhcTc -> GenLocated SrcSpanAnnA (Pat GhcTc)
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc Pat GhcTc
    p)
            CoPat {} -> String -> Bool
    forall a. HasCallStack => String -> a
    panic String
    "isStrictPattern: CoPat"

    {-
    Note [ApplicativeDo and refutable patterns]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Refutable patterns in do blocks are desugared to use the monadic 'fail' operation.
    This means that sometimes an applicative block needs to be wrapped in 'join' simply because
    of a refutable pattern, in order for the types to work out.

    -}

    hasRefutablePattern :: DynFlags -> ApplicativeArg GhcRn -> Bool
    hasRefutablePattern :: DynFlags -> ApplicativeArg GhcRn -> Bool
    hasRefutablePattern DynFlags
    dflags (ApplicativeArgOne { app_arg_pattern :: forall idL. ApplicativeArg idL -> LPat idL
    app_arg_pattern = LPat GhcRn
    pat
                                                  , is_body_stmt :: forall idL. ApplicativeArg idL -> Bool
    is_body_stmt = Bool
    False}) =
                                             Bool -> Bool
    not (DynFlags -> LPat GhcRn -> Bool
    forall (p :: Pass).
    OutputableBndrId p =>
    DynFlags -> LPat (GhcPass p) -> Bool
    isIrrefutableHsPat DynFlags
    dflags LPat GhcRn
    pat)
    hasRefutablePattern DynFlags
    _ ApplicativeArg GhcRn
    _ = Bool
    False

    isLetStmt :: LStmt (GhcPass a) b -> Bool
    isLetStmt :: forall (a :: Pass) b. LStmt (GhcPass a) b -> Bool
    isLetStmt (L Anno (StmtLR (GhcPass a) (GhcPass a) b)
    _ LetStmt{}) = Bool
    True
    isLetStmt LStmt (GhcPass a) b
    _ = Bool
    False

    -- | Find a "good" place to insert a bind in an indivisible segment.
    -- This is the only place where we use heuristics.  The current
    -- heuristic is to peel off the first group of independent statements
    -- and put the bind after those.
    splitSegment
      :: [(ExprLStmt GhcRn, FreeVars)]
      -> ( [(ExprLStmt GhcRn, FreeVars)]
         , [(ExprLStmt GhcRn, FreeVars)] )
    splitSegment :: [(ExprLStmt GhcRn, FreeVars)]
    -> ([(ExprLStmt GhcRn, FreeVars)], [(ExprLStmt GhcRn, FreeVars)])
    splitSegment [(ExprLStmt GhcRn, FreeVars)
    one,(ExprLStmt GhcRn, FreeVars)
    two] = ([(ExprLStmt GhcRn, FreeVars)
    one],[(ExprLStmt GhcRn, FreeVars)
    two])
      -- there is no choice when there are only two statements; this just saves
      -- some work in a common case.
    splitSegment [(ExprLStmt GhcRn, FreeVars)]
    stmts
      | Just ([(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    lets,[(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    binds,[(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    rest) <- [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    -> Maybe
         ([(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)],
          [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)],
          [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)])
    forall (body :: * -> *).
    [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
    -> Maybe
         ([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)],
          [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)],
          [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)])
    slurpIndependentStmts [(ExprLStmt GhcRn, FreeVars)]
    [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    stmts
      =  if Bool -> Bool
    not ([(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    lets)
           then ([(ExprLStmt GhcRn, FreeVars)]
    [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    lets, [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    binds[(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. [a] -> [a] -> [a]
    ++[(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    rest)
           else ([(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    lets[(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    -> [(GenLocated
           SrcSpanAnnA
           (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
         FreeVars)]
    forall a. [a] -> [a] -> [a]
    ++[(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA
        (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    binds, [(ExprLStmt GhcRn, FreeVars)]
    [(LStmt GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)), FreeVars)]
    rest)
      | Bool
    otherwise
      = case [(ExprLStmt GhcRn, FreeVars)]
    stmts of
          ((ExprLStmt GhcRn, FreeVars)
    x:[(ExprLStmt GhcRn, FreeVars)]
    xs) -> ([(ExprLStmt GhcRn, FreeVars)
    x],[(ExprLStmt GhcRn, FreeVars)]
    xs)
          [(ExprLStmt GhcRn, FreeVars)]
    _other -> ([(ExprLStmt GhcRn, FreeVars)]
    stmts,[])

    slurpIndependentStmts
       :: [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
       -> Maybe ( [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)] -- LetStmts
                , [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)] -- BindStmts
                , [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)] )
    slurpIndependentStmts :: forall (body :: * -> *).
    [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
    -> Maybe
         ([(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)],
          [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)],
          [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)])
    slurpIndependentStmts [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
    stmts = [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
      FreeVars)]
    -> [(GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
         FreeVars)]
    -> FreeVars
    -> [(GenLocated
           SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
         FreeVars)]
    -> Maybe
         ([(GenLocated
              SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
            FreeVars)],
          [(GenLocated
              SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
            FreeVars)],
          [(GenLocated
              SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
            FreeVars)])
    forall {p :: Pass} {idR} {body} {idR} {body} {l}.
    (XBindStmt (GhcPass p) idR body ~ XBindStmt (GhcPass p) idR body,
     IdGhcP p ~ Name,
     XLetStmt (GhcPass p) idR body ~ XLetStmt (GhcPass p) idR body,
     IsPass p) =>
    [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> FreeVars
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> Maybe
         ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    go [] [] FreeVars
    emptyNameSet [(LStmt GhcRn (LocatedA (body GhcRn)), FreeVars)]
    [(GenLocated
        SrcSpanAnnA (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))),
      FreeVars)]
    stmts
     where
      -- If we encounter a BindStmt that doesn't depend on a previous BindStmt
      -- in this group, then add it to the group. We have to be careful about
      -- strict patterns though; splitSegments expects that if we return Just
      -- then we have actually done some splitting. Otherwise it will go into
      -- an infinite loop (#14163).
      go :: [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> FreeVars
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> Maybe
         ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    go [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    lets [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    indep FreeVars
    bndrs ((L l
    loc (BindStmt XBindStmt (GhcPass p) idR body
    xbs LPat (GhcPass p)
    pat body
    body), FreeVars
    fvs): [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    rest)
        | FreeVars -> FreeVars -> Bool
    disjointNameSet FreeVars
    bndrs FreeVars
    fvs Bool -> Bool -> Bool
    && Bool -> Bool
    not (LPat (GhcPass p) -> Bool
    forall (p :: Pass). IsPass p => LPat (GhcPass p) -> Bool
    isStrictPattern LPat (GhcPass p)
    pat)
        = [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> FreeVars
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> Maybe
         ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    go [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    lets ((l
    -> StmtLR (GhcPass p) idR body
    -> GenLocated l (StmtLR (GhcPass p) idR body)
    forall l e. l -> e -> GenLocated l e
    L l
    loc (XBindStmt (GhcPass p) idR body
    -> LPat (GhcPass p) -> body -> StmtLR (GhcPass p) idR body
    forall idL idR body.
    XBindStmt idL idR body -> LPat idL -> body -> StmtLR idL idR body
    BindStmt XBindStmt (GhcPass p) idR body
    XBindStmt (GhcPass p) idR body
    xbs LPat (GhcPass p)
    pat body
    body), FreeVars
    fvs) (GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    forall a. a -> [a] -> [a]
    : [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    indep)
             FreeVars
    bndrs' [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    rest
        where bndrs' :: FreeVars
    bndrs' = FreeVars
    bndrs FreeVars -> FreeVars -> FreeVars
    `unionNameSet` [Name] -> FreeVars
    mkNameSet (CollectFlag (GhcPass p) -> LPat (GhcPass p) -> [IdP (GhcPass p)]
    forall p. CollectPass p => CollectFlag p -> LPat p -> [IdP p]
    collectPatBinders CollectFlag (GhcPass p)
    forall p. CollectFlag p
    CollNoDictBinders LPat (GhcPass p)
    pat)
      -- If we encounter a LetStmt that doesn't depend on a BindStmt in this
      -- group, then move it to the beginning, so that it doesn't interfere with
      -- grouping more BindStmts.
      -- TODO: perhaps we shouldn't do this if there are any strict bindings,
      -- because we might be moving evaluation earlier.
      go [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    lets [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    indep FreeVars
    bndrs ((L l
    loc (LetStmt XLetStmt (GhcPass p) idR body
    noExtField HsLocalBindsLR (GhcPass p) idR
    binds), FreeVars
    fvs) : [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    rest)
        | FreeVars -> FreeVars -> Bool
    disjointNameSet FreeVars
    bndrs FreeVars
    fvs
        = [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> FreeVars
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> Maybe
         ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    go ((l
    -> StmtLR (GhcPass p) idR body
    -> GenLocated l (StmtLR (GhcPass p) idR body)
    forall l e. l -> e -> GenLocated l e
    L l
    loc (XLetStmt (GhcPass p) idR body
    -> HsLocalBindsLR (GhcPass p) idR -> StmtLR (GhcPass p) idR body
    forall idL idR body.
    XLetStmt idL idR body
    -> HsLocalBindsLR idL idR -> StmtLR idL idR body
    LetStmt XLetStmt (GhcPass p) idR body
    XLetStmt (GhcPass p) idR body
    noExtField HsLocalBindsLR (GhcPass p) idR
    binds), FreeVars
    fvs) (GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    forall a. a -> [a] -> [a]
    : [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    lets) [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    indep FreeVars
    bndrs [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    rest
      go [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    _ []  FreeVars
    _ [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    _ = Maybe
      ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
       [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
       [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    forall a. Maybe a
    Nothing
      go [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    _ [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)
    _] FreeVars
    _ [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    _ = Maybe
      ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
       [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
       [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    forall a. Maybe a
    Nothing
      go [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    lets [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    indep FreeVars
    _ [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    stmts = ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
     [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
     [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    -> Maybe
         ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)],
          [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)])
    forall a. a -> Maybe a
    Just ([(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    forall a. [a] -> [a]
    reverse [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    lets, [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    -> [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    forall a. [a] -> [a]
    reverse [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    indep, [(GenLocated l (StmtLR (GhcPass p) idR body), FreeVars)]
    stmts)

    -- | Build an ApplicativeStmt, and strip the "return" from the tail
    -- if necessary.
    --
    -- For example, if we start with
    --   do x <- E1; y <- E2; return (f x y)
    -- then we get
    --   do (E1[x] | E2[y]); f x y
    --
    -- the LastStmt in this case has the return removed, but we set the
    -- flag on the LastStmt to indicate this, so that we can print out the
    -- original statement correctly in error messages.  It is easier to do
    -- it this way rather than try to ignore the return later in both the
    -- typechecker and the desugarer (I tried it that way first!).
    mkApplicativeStmt
      :: HsDoFlavour
      -> [ApplicativeArg GhcRn]             -- ^ The args
      -> Bool                               -- ^ True <=> need a join
      -> [ExprLStmt GhcRn]        -- ^ The body statements
      -> RnM ([ExprLStmt GhcRn], FreeVars)
    mkApplicativeStmt :: HsDoFlavour
    -> [ApplicativeArg GhcRn]
    -> Bool
    -> [ExprLStmt GhcRn]
    -> RnM ([ExprLStmt GhcRn], FreeVars)
    mkApplicativeStmt HsDoFlavour
    ctxt [ApplicativeArg GhcRn]
    args Bool
    need_join [ExprLStmt GhcRn]
    body_stmts
      = do { (fmap_op, fvs1) <- HsStmtContextRn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    lookupQualifiedDoStmtName (HsDoFlavour -> HsStmtContext (GenLocated SrcSpanAnnN Name)
    forall fn. HsDoFlavour -> HsStmtContext fn
    HsDoStmt HsDoFlavour
    ctxt) Name
    fmapName
           ; (ap_op, fvs2) <- lookupQualifiedDoStmtName (HsDoStmt ctxt) apAName
           ; (mb_join, fvs3) <-
               if need_join then
                 do { (join_op, fvs) <- lookupQualifiedDoStmtName (HsDoStmt ctxt) joinMName
                    ; return (Just join_op, fvs) }
               else
                 return (Nothing, emptyNameSet)
           -- We cannot really say where the ApplicativeStmt is located with more accuracy
           -- than the span of the do-block, but it is better than nothing for IDE info
           -- See Note [Source locations for implicit function calls]
           ; loc <- getSrcSpanM
           ; let applicative_stmt = SrcSpanAnnA
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    forall l e. l -> e -> GenLocated l e
    L (SrcSpan -> SrcSpanAnnA
    forall e. HasAnnotation e => SrcSpan -> e
    noAnnSrcSpan SrcSpan
    loc) (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
     -> GenLocated
          SrcSpanAnnA
          (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))))
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    forall a b. (a -> b) -> a -> b
    $ XApplicativeStmt
      GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    -> Maybe (SyntaxExpr GhcRn)
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    forall idL idR body.
    XApplicativeStmt idL idR body
    -> [(SyntaxExpr idR, ApplicativeArg idL)]
    -> Maybe (SyntaxExpr idR)
    -> StmtLR idL idR body
    ApplicativeStmt XApplicativeStmt
      GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    NoExtField
    noExtField
                   ([SyntaxExprRn]
    -> [ApplicativeArg GhcRn] -> [(SyntaxExprRn, ApplicativeArg GhcRn)]
    forall a b. [a] -> [b] -> [(a, b)]
    zip (SyntaxExprRn
    fmap_op SyntaxExprRn -> [SyntaxExprRn] -> [SyntaxExprRn]
    forall a. a -> [a] -> [a]
    : SyntaxExprRn -> [SyntaxExprRn]
    forall a. a -> [a]
    repeat SyntaxExprRn
    ap_op) [ApplicativeArg GhcRn]
    args)
                   Maybe (SyntaxExpr GhcRn)
    Maybe SyntaxExprRn
    mb_join
           ; return ( applicative_stmt : body_stmts
                    , fvs1 `plusFV` fvs2 `plusFV` fvs3) }

    -- | Given the statements following an ApplicativeStmt, determine whether
    -- we need a @join@ or not, and remove the @return@ if necessary.
    --
    -- We don't need @join@ if there's a single @LastStmt@ in the form of
    -- @return E@, @return $ E@, @pure E@ or @pure $ E@.
    needJoin :: MonadNames
             -> [ExprLStmt GhcRn]
                -- If this is @Just pure@, replace return by pure
                -- If this is @Nothing@, strip the return/pure
             -> Maybe (HsExpr GhcRn)
             -> (Bool, [ExprLStmt GhcRn])
    needJoin :: MonadNames
    -> [ExprLStmt GhcRn]
    -> Maybe (HsExpr GhcRn)
    -> (Bool, [ExprLStmt GhcRn])
    needJoin MonadNames
    _monad_names [] Maybe (HsExpr GhcRn)
    _mb_pure = (Bool
    False, [])  -- we're in an ApplicativeArg
    needJoin MonadNames
    monad_names  [L SrcSpanAnnA
    loc (LastStmt XLastStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    _ GenLocated SrcSpanAnnA (HsExpr GhcRn)
    e Maybe Bool
    _ SyntaxExpr GhcRn
    t)] Maybe (HsExpr GhcRn)
    mb_pure
     | Just (XRec GhcRn (HsExpr GhcRn)
    arg, Maybe Bool
    noret) <- MonadNames
    -> XRec GhcRn (HsExpr GhcRn)
    -> Maybe (HsExpr GhcRn)
    -> Maybe (XRec GhcRn (HsExpr GhcRn), Maybe Bool)
    isReturnApp MonadNames
    monad_names XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    e Maybe (HsExpr GhcRn)
    mb_pure =
           (Bool
    False, [SrcSpanAnnA
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> GenLocated
         SrcSpanAnnA
         (StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc (XLastStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> Maybe Bool
    -> SyntaxExpr GhcRn
    -> StmtLR GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    forall idL idR body.
    XLastStmt idL idR body
    -> body -> Maybe Bool -> SyntaxExpr idR -> StmtLR idL idR body
    LastStmt XLastStmt GhcRn GhcRn (GenLocated SrcSpanAnnA (HsExpr GhcRn))
    NoExtField
    noExtField XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    arg Maybe Bool
    noret SyntaxExpr GhcRn
    t)])
    needJoin MonadNames
    _monad_names [ExprLStmt GhcRn]
    stmts Maybe (HsExpr GhcRn)
    _mb_pure = (Bool
    True, [ExprLStmt GhcRn]
    stmts)

    -- | @(Just e, Just False)@, if the expression is @return/pure e@,
    --     and the third argument is Nothing,
    --   @(Just e, Just True)@ if the expression is @return/pure $ e@,
    --     and the third argument is Nothing,
    --   @(Just (pure e), Nothing)@ if the expression is @return/pure e@,
    --     and the third argument is @Just pure_expr@,
    --   @(Just (pure $ e), Nothing)@ if the expression is @return/pure $ e@,
    --     and the third argument is @Just pure_expr@,
    --   otherwise @Nothing@.
    isReturnApp :: MonadNames
                -> LHsExpr GhcRn
                -- If this is @Just pure@, replace return by pure
                -- If this is @Nothing@, strip the return/pure
                -> Maybe (HsExpr GhcRn)
                -> Maybe (LHsExpr GhcRn, Maybe Bool)
    isReturnApp :: MonadNames
    -> XRec GhcRn (HsExpr GhcRn)
    -> Maybe (HsExpr GhcRn)
    -> Maybe (XRec GhcRn (HsExpr GhcRn), Maybe Bool)
    isReturnApp MonadNames
    monad_names (L SrcSpanAnnA
    _ (HsPar XPar GhcRn
    _ XRec GhcRn (HsExpr GhcRn)
    expr)) Maybe (HsExpr GhcRn)
    mb_pure =
      MonadNames
    -> XRec GhcRn (HsExpr GhcRn)
    -> Maybe (HsExpr GhcRn)
    -> Maybe (XRec GhcRn (HsExpr GhcRn), Maybe Bool)
    isReturnApp MonadNames
    monad_names XRec GhcRn (HsExpr GhcRn)
    expr Maybe (HsExpr GhcRn)
    mb_pure
    isReturnApp MonadNames
    monad_names (L SrcSpanAnnA
    loc HsExpr GhcRn
    e) Maybe (HsExpr GhcRn)
    mb_pure = case HsExpr GhcRn
    e of
      OpApp XOpApp GhcRn
    x XRec GhcRn (HsExpr GhcRn)
    l XRec GhcRn (HsExpr GhcRn)
    op XRec GhcRn (HsExpr GhcRn)
    r
        | Just HsExpr GhcRn
    pure_expr <- Maybe (HsExpr GhcRn)
    mb_pure, GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_return XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    l, GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_dollar XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    op ->
            (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    -> Maybe (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    forall a. a -> Maybe a
    Just (SrcSpanAnnA
    -> HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc (XOpApp GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p.
    XOpApp p -> LHsExpr p -> LHsExpr p -> LHsExpr p -> HsExpr p
    OpApp XOpApp GhcRn
    x (GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall {l} {e} {e}. GenLocated l e -> e -> GenLocated l e
    to_pure XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    l HsExpr GhcRn
    pure_expr) XRec GhcRn (HsExpr GhcRn)
    op XRec GhcRn (HsExpr GhcRn)
    r), Maybe Bool
    forall a. Maybe a
    Nothing)
        | GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_return XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    l, GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_dollar XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    op -> (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    -> Maybe (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    forall a. a -> Maybe a
    Just (XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    r, Bool -> Maybe Bool
    forall a. a -> Maybe a
    Just Bool
    True)
      HsApp XApp GhcRn
    x XRec GhcRn (HsExpr GhcRn)
    f XRec GhcRn (HsExpr GhcRn)
    arg
        | Just HsExpr GhcRn
    pure_expr <- Maybe (HsExpr GhcRn)
    mb_pure, GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_return XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    f ->
            (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    -> Maybe (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    forall a. a -> Maybe a
    Just (SrcSpanAnnA
    -> HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc (XApp GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XApp p -> LHsExpr p -> LHsExpr p -> HsExpr p
    HsApp XApp GhcRn
    x (GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall {l} {e} {e}. GenLocated l e -> e -> GenLocated l e
    to_pure XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    f HsExpr GhcRn
    pure_expr) XRec GhcRn (HsExpr GhcRn)
    arg), Maybe Bool
    forall a. Maybe a
    Nothing)
        | GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_return XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    f -> (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    -> Maybe (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    forall a. a -> Maybe a
    Just (XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    arg, Bool -> Maybe Bool
    forall a. a -> Maybe a
    Just Bool
    False)
      HsExpr GhcRn
    _otherwise -> Maybe (XRec GhcRn (HsExpr GhcRn), Maybe Bool)
    Maybe (GenLocated SrcSpanAnnA (HsExpr GhcRn), Maybe Bool)
    forall a. Maybe a
    Nothing
     where
      is_var :: (IdP p -> Bool) -> GenLocated l (HsExpr p) -> Bool
    is_var IdP p -> Bool
    f (L l
    _ (HsPar XPar p
    _ XRec p (HsExpr p)
    e)) = (IdP p -> Bool) -> GenLocated l (HsExpr p) -> Bool
    is_var IdP p -> Bool
    f XRec p (HsExpr p)
    GenLocated l (HsExpr p)
    e
      is_var IdP p -> Bool
    f (L l
    _ (HsAppType XAppTypeE p
    _ XRec p (HsExpr p)
    e LHsWcType (NoGhcTc p)
    _)) = (IdP p -> Bool) -> GenLocated l (HsExpr p) -> Bool
    is_var IdP p -> Bool
    f XRec p (HsExpr p)
    GenLocated l (HsExpr p)
    e
      is_var IdP p -> Bool
    f (L l
    _ (HsVar XVar p
    _ (L l
    _ IdP p
    r))) = IdP p -> Bool
    f IdP p
    r
           -- TODO: I don't know how to get this right for rebindable syntax
      is_var IdP p -> Bool
    _ GenLocated l (HsExpr p)
    _ = Bool
    False

      is_return :: GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_return = (IdP GhcRn -> Bool)
    -> GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    forall {p} {l} {l}.
    (XRec p (HsExpr p) ~ GenLocated l (HsExpr p),
     XRec p (IdP p) ~ GenLocated l (IdP p)) =>
    (IdP p -> Bool) -> GenLocated l (HsExpr p) -> Bool
    is_var (\IdP GhcRn
    n -> IdP GhcRn
    Name
    n Name -> Name -> Bool
    forall a. Eq a => a -> a -> Bool
    == MonadNames -> Name
    return_name MonadNames
    monad_names
                             Bool -> Bool -> Bool
    || IdP GhcRn
    Name
    n Name -> Name -> Bool
    forall a. Eq a => a -> a -> Bool
    == MonadNames -> Name
    pure_name MonadNames
    monad_names)
      to_pure :: GenLocated l e -> e -> GenLocated l e
    to_pure (L l
    loc e
    _) e
    pure_expr = l -> e -> GenLocated l e
    forall l e. l -> e -> GenLocated l e
    L l
    loc e
    pure_expr
      is_dollar :: GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    is_dollar = (IdP GhcRn -> Bool)
    -> GenLocated SrcSpanAnnA (HsExpr GhcRn) -> Bool
    forall {p} {l} {l}.
    (XRec p (HsExpr p) ~ GenLocated l (HsExpr p),
     XRec p (IdP p) ~ GenLocated l (IdP p)) =>
    (IdP p -> Bool) -> GenLocated l (HsExpr p) -> Bool
    is_var (IdP GhcRn -> Unique -> Bool
    forall a. Uniquable a => a -> Unique -> Bool
    `hasKey` Unique
    dollarIdKey)

    {-
    ************************************************************************
    *                                                                      *
    \subsubsection{Errors}
    *                                                                      *
    ************************************************************************
    -}

    checkEmptyStmts :: HsStmtContextRn -> RnM ()
    -- We've seen an empty sequence of Stmts... is that ok?
    checkEmptyStmts :: HsStmtContextRn -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkEmptyStmts HsStmtContextRn
    ctxt
      = (EmptyStatementGroupErrReason -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> Maybe EmptyStatementGroupErrReason
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> (EmptyStatementGroupErrReason -> TcRnMessage)
    -> EmptyStatementGroupErrReason
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . EmptyStatementGroupErrReason -> TcRnMessage
    TcRnEmptyStmtsGroup) Maybe EmptyStatementGroupErrReason
    mb_err
      where
        mb_err :: Maybe EmptyStatementGroupErrReason
    mb_err = case HsStmtContextRn
    ctxt of
          PatGuard {}      -> Maybe EmptyStatementGroupErrReason
    forall a. Maybe a
    Nothing -- Pattern guards can be empty
          ParStmtCtxt {}   -> EmptyStatementGroupErrReason -> Maybe EmptyStatementGroupErrReason
    forall a. a -> Maybe a
    Just EmptyStatementGroupErrReason
    EmptyStmtsGroupInParallelComp
          TransStmtCtxt {} -> EmptyStatementGroupErrReason -> Maybe EmptyStatementGroupErrReason
    forall a. a -> Maybe a
    Just EmptyStatementGroupErrReason
    EmptyStmtsGroupInTransformListComp
          HsDoStmt HsDoFlavour
    flav    -> EmptyStatementGroupErrReason -> Maybe EmptyStatementGroupErrReason
    forall a. a -> Maybe a
    Just (EmptyStatementGroupErrReason
     -> Maybe EmptyStatementGroupErrReason)
    -> EmptyStatementGroupErrReason
    -> Maybe EmptyStatementGroupErrReason
    forall a b. (a -> b) -> a -> b
    $ HsDoFlavour -> EmptyStatementGroupErrReason
    EmptyStmtsGroupInDoNotation HsDoFlavour
    flav
          HsStmtContextRn
    ArrowExpr        -> EmptyStatementGroupErrReason -> Maybe EmptyStatementGroupErrReason
    forall a. a -> Maybe a
    Just EmptyStatementGroupErrReason
    EmptyStmtsGroupInArrowNotation

    ----------------------
    checkLastStmt :: AnnoBody body
                  => HsStmtContextRn
                  -> LStmt GhcPs (LocatedA (body GhcPs))
                  -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    checkLastStmt :: forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    checkLastStmt HsStmtContextRn
    ctxt lstmt :: LStmt GhcPs (LocatedA (body GhcPs))
    lstmt@(L SrcSpanAnnA
    loc StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    stmt)
      = case HsStmtContextRn
    ctxt of
          HsDoStmt HsDoFlavour
    ListComp  -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_comp
          HsDoStmt HsDoFlavour
    MonadComp -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_comp
          HsDoStmt DoExpr{}  -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_do
          HsDoStmt MDoExpr{} -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_do
          HsStmtContextRn
    ArrowExpr -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_do
          HsStmtContextRn
    _         -> RnM (LStmt GhcPs (LocatedA (body GhcPs)))
    IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_other
      where
        check_do :: IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_do    -- Expect BodyStmt, and change it to LastStmt
          = case StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    stmt of
              BodyStmt XBodyStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ LocatedA (body GhcPs)
    e SyntaxExpr GhcPs
    _ SyntaxExpr GhcPs
    _ -> GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (SrcSpanAnnA
    -> StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    -> GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc (LocatedA (body GhcPs) -> StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    forall (idR :: Pass) (bodyR :: * -> *) (idL :: Pass).
    IsPass idR =>
    LocatedA (bodyR (GhcPass idR))
    -> StmtLR
         (GhcPass idL) (GhcPass idR) (LocatedA (bodyR (GhcPass idR)))
    mkLastStmt LocatedA (body GhcPs)
    e))
              LastStmt {}      -> GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    lstmt   -- "Deriving" clauses may generate a
                                                 -- LastStmt directly (unlike the parser)
              StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    _                -> do { TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a b. (a -> b) -> a -> b
    $ HsStmtContextRn -> UnexpectedStatement -> TcRnMessage
    TcRnLastStmtNotExpr HsStmtContextRn
    ctxt
                                              (UnexpectedStatement -> TcRnMessage)
    -> UnexpectedStatement -> TcRnMessage
    forall a b. (a -> b) -> a -> b
    $ StmtLR GhcPs GhcPs (LocatedA (body GhcPs)) -> UnexpectedStatement
    forall body.
    Outputable (StmtLR GhcPs GhcPs body) =>
    StmtLR GhcPs GhcPs body -> UnexpectedStatement
    UnexpectedStatement StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    stmt
                                     ; GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    lstmt }

        check_comp :: IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_comp  -- Expect LastStmt; this should be enforced by the parser!
          = case StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    stmt of
              LastStmt {} -> GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    lstmt
              StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    _           -> String
    -> SDoc
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "checkLastStmt" (GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    lstmt)

        check_other :: IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated
         SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    check_other -- Behave just as if this wasn't the last stmt
          = do { HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkStmt HsStmtContextRn
    ctxt LStmt GhcPs (LocatedA (body GhcPs))
    lstmt; GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs))))
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LStmt GhcPs (LocatedA (body GhcPs))
    GenLocated SrcSpanAnnA (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)))
    lstmt }

    -- Checking when a particular Stmt is ok
    checkStmt :: AnnoBody body
              => HsStmtContextRn
              -> LStmt GhcPs (LocatedA (body GhcPs))
              -> RnM ()
    checkStmt :: forall (body :: * -> *).
    AnnoBody body =>
    HsStmtContextRn
    -> LStmt GhcPs (LocatedA (body GhcPs))
    -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkStmt HsStmtContextRn
    ctxt (L SrcSpanAnnA
    _ StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    stmt)
      = do { dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
    forall (m :: * -> *). HasDynFlags m => m DynFlags
    getDynFlags
           ; case okStmt dflags ctxt stmt of
               Validity' (Maybe Extension)
    IsValid      -> () -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
               NotValid Maybe Extension
    ext -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    addErr (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
    -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
    forall a b. (a -> b) -> a -> b
    $
                  HsStmtContextRn
    -> UnexpectedStatement -> Maybe Extension -> TcRnMessage
    TcRnUnexpectedStatementInContext
                    HsStmtContextRn
    ctxt (StmtLR GhcPs GhcPs (LocatedA (body GhcPs)) -> UnexpectedStatement
    forall body.
    Outputable (StmtLR GhcPs GhcPs body) =>
    StmtLR GhcPs GhcPs body -> UnexpectedStatement
    UnexpectedStatement StmtLR GhcPs GhcPs (LocatedA (body GhcPs))
    stmt) Maybe Extension
    ext }

    ------------
    emptyInvalid :: Validity' (Maybe LangExt.Extension)
    emptyInvalid :: Validity' (Maybe Extension)
    emptyInvalid = Maybe Extension -> Validity' (Maybe Extension)
    forall a. a -> Validity' a
    NotValid Maybe Extension
    forall a. Maybe a
    Nothing -- Invalid, and no extension to suggest

    okStmt, okDoStmt, okCompStmt, okParStmt
       :: DynFlags -> HsStmtContextRn
       -> Stmt GhcPs (LocatedA (body GhcPs)) -> Validity' (Maybe LangExt.Extension)
    -- Return Nothing if OK, (Just extra) if not ok
    -- The "extra" is an SDoc that is appended to a generic error message

    okStmt :: forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okStmt DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
      = case HsStmtContextRn
    ctxt of
          PatGuard {}        -> Stmt GhcPs (LocatedA (body GhcPs)) -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    Stmt GhcPs (LocatedA (body GhcPs)) -> Validity' (Maybe Extension)
    okPatGuardStmt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          ParStmtCtxt HsStmtContextRn
    ctxt   -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okParStmt  DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          HsDoStmt HsDoFlavour
    flavour   -> DynFlags
    -> HsDoFlavour
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsDoFlavour
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okDoFlavourStmt DynFlags
    dflags HsDoFlavour
    flavour HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          HsStmtContextRn
    ArrowExpr          -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okDoStmt   DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          TransStmtCtxt HsStmtContextRn
    ctxt -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okStmt DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt

    okDoFlavourStmt
      :: DynFlags -> HsDoFlavour -> HsStmtContextRn
      -> Stmt GhcPs (LocatedA (body GhcPs)) -> Validity' (Maybe LangExt.Extension)
    okDoFlavourStmt :: forall (body :: * -> *).
    DynFlags
    -> HsDoFlavour
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okDoFlavourStmt DynFlags
    dflags HsDoFlavour
    flavour HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt = case HsDoFlavour
    flavour of
          DoExpr{}     -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okDoStmt   DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          MDoExpr{}    -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okDoStmt   DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          HsDoFlavour
    GhciStmtCtxt -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okDoStmt   DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          HsDoFlavour
    ListComp     -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okCompStmt DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
          HsDoFlavour
    MonadComp    -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okCompStmt DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt

    -------------
    okPatGuardStmt :: Stmt GhcPs (LocatedA (body GhcPs)) -> Validity' (Maybe LangExt.Extension)
    okPatGuardStmt :: forall (body :: * -> *).
    Stmt GhcPs (LocatedA (body GhcPs)) -> Validity' (Maybe Extension)
    okPatGuardStmt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
      = case Stmt GhcPs (LocatedA (body GhcPs))
    stmt of
          BodyStmt {} -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
          BindStmt {} -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
          LetStmt {}  -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
          Stmt GhcPs (LocatedA (body GhcPs))
    _           -> Validity' (Maybe Extension)
    emptyInvalid

    -------------
    okParStmt :: forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okParStmt DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
      = case Stmt GhcPs (LocatedA (body GhcPs))
    stmt of
          LetStmt XLetStmt GhcPs GhcPs (LocatedA (body GhcPs))
    _ (HsIPBinds {}) -> Validity' (Maybe Extension)
    emptyInvalid
          Stmt GhcPs (LocatedA (body GhcPs))
    _                        -> DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okStmt DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt

    ----------------
    okDoStmt :: forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okDoStmt DynFlags
    dflags HsStmtContextRn
    ctxt Stmt GhcPs (LocatedA (body GhcPs))
    stmt
      = case Stmt GhcPs (LocatedA (body GhcPs))
    stmt of
           RecStmt {}
             | Extension
    LangExt.RecursiveDo Extension -> DynFlags -> Bool
    `xopt` DynFlags
    dflags -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
             | HsStmtContextRn
    ArrowExpr <- HsStmtContextRn
    ctxt -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid    -- Arrows allows 'rec'
             | Bool
    otherwise         -> Maybe Extension -> Validity' (Maybe Extension)
    forall a. a -> Validity' a
    NotValid (Extension -> Maybe Extension
    forall a. a -> Maybe a
    Just Extension
    LangExt.RecursiveDo)
           BindStmt {} -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
           LetStmt {}  -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
           BodyStmt {} -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
           Stmt GhcPs (LocatedA (body GhcPs))
    _           -> Validity' (Maybe Extension)
    emptyInvalid

    ----------------
    okCompStmt :: forall (body :: * -> *).
    DynFlags
    -> HsStmtContextRn
    -> Stmt GhcPs (LocatedA (body GhcPs))
    -> Validity' (Maybe Extension)
    okCompStmt DynFlags
    dflags HsStmtContextRn
    _ Stmt GhcPs (LocatedA (body GhcPs))
    stmt
      = case Stmt GhcPs (LocatedA (body GhcPs))
    stmt of
           BindStmt {} -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
           LetStmt {}  -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
           BodyStmt {} -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
           ParStmt {}
             | Extension
    LangExt.ParallelListComp Extension -> DynFlags -> Bool
    `xopt` DynFlags
    dflags -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
             | Bool
    otherwise -> Maybe Extension -> Validity' (Maybe Extension)
    forall a. a -> Validity' a
    NotValid (Extension -> Maybe Extension
    forall a. a -> Maybe a
    Just Extension
    LangExt.ParallelListComp)
           TransStmt {}
             | Extension
    LangExt.TransformListComp Extension -> DynFlags -> Bool
    `xopt` DynFlags
    dflags -> Validity' (Maybe Extension)
    forall a. Validity' a
    IsValid
             | Bool
    otherwise -> Maybe Extension -> Validity' (Maybe Extension)
    forall a. a -> Validity' a
    NotValid (Extension -> Maybe Extension
    forall a. a -> Maybe a
    Just Extension
    LangExt.TransformListComp)
           RecStmt {}  -> Validity' (Maybe Extension)
    emptyInvalid
           LastStmt {} -> Validity' (Maybe Extension)
    emptyInvalid  -- Should not happen (dealt with by checkLastStmt)
           ApplicativeStmt {} -> Validity' (Maybe Extension)
    emptyInvalid

    ---------
    checkTupleSection :: [HsTupArg GhcPs] -> RnM ()
    checkTupleSection :: [HsTupArg GhcPs] -> IOEnv (Env TcGblEnv TcLclEnv) ()
    checkTupleSection [HsTupArg GhcPs]
    args
      = do  { tuple_section <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
    forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
    xoptM Extension
    LangExt.TupleSections
            ; checkErr (all tupArgPresent args || tuple_section) msg }
      where
        msg :: TcRnMessage
        msg :: TcRnMessage
    msg = TcRnMessage
    TcRnIllegalTupleSection

    ---------
    sectionErr :: HsExpr GhcPs -> TcRnMessage
    sectionErr :: HsExpr GhcPs -> TcRnMessage
    sectionErr = HsExpr GhcPs -> TcRnMessage
    TcRnSectionWithoutParentheses

    badIpBinds :: Either (HsLocalBindsLR GhcPs GhcPs) (HsLocalBindsLR GhcRn GhcPs) -> TcRnMessage
    badIpBinds :: Either (HsLocalBinds GhcPs) (HsLocalBindsLR GhcRn GhcPs)
    -> TcRnMessage
    badIpBinds = Either (HsLocalBinds GhcPs) (HsLocalBindsLR GhcRn GhcPs)
    -> TcRnMessage
    TcRnIllegalImplicitParameterBindings

    ---------

    monadFailOp :: LPat GhcPs
                -> HsStmtContextRn
                -> RnM (FailOperator GhcRn, FreeVars)
    monadFailOp :: LPat GhcPs
    -> HsStmtContextRn -> RnM (Maybe (SyntaxExpr GhcRn), FreeVars)
    monadFailOp LPat GhcPs
    pat HsStmtContextRn
    ctxt = do
        dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
    forall (m :: * -> *). HasDynFlags m => m DynFlags
    getDynFlags
            -- If the pattern is irrefutable (e.g.: wildcard, tuple, ~pat, etc.)
            -- we should not need to fail.
        if | isIrrefutableHsPat dflags pat -> return (Nothing, emptyFVs)

            -- For non-monadic contexts (e.g. guard patterns, list
            -- comprehensions, etc.) we should not need to fail, or failure is handled in
            -- a different way. See Note [Failing pattern matches in Stmts].
           | not (isMonadStmtContext ctxt) -> return (Nothing, emptyFVs)

           | otherwise -> getMonadFailOp ctxt

    {-
    Note [Monad fail : Rebindable syntax, overloaded strings]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Given the code
      foo x = do { Just y <- x; return y }

    we expect it to desugar as
      foo x = x >>= \r -> case r of
                            Just y  -> return y
                            Nothing -> fail "Pattern match error"

    But with RebindableSyntax and OverloadedStrings, we really want
    it to desugar thus:
      foo x = x >>= \r -> case r of
                            Just y  -> return y
                            Nothing -> fail (fromString "Patterm match error")

    So, in this case, we synthesize the function
      \x -> fail (fromString x)

    (rather than plain 'fail') for the 'fail' operation. This is done in
    'getMonadFailOp'.

    Similarly with QualifiedDo and OverloadedStrings, we also want to desugar
    using fromString:

      foo x = M.do { Just y <- x; return y }

      ===>

      foo x = x M.>>= \r -> case r of
                            Just y  -> return y
                            Nothing -> M.fail (fromString "Pattern match error")

    -}
    getMonadFailOp :: HsStmtContext fn -> RnM (FailOperator GhcRn, FreeVars) -- Syntax expr fail op
    getMonadFailOp :: forall fn.
    HsStmtContext fn -> RnM (Maybe (SyntaxExpr GhcRn), FreeVars)
    getMonadFailOp HsStmtContext fn
    ctxt
     = do { xOverloadedStrings <- (DynFlags -> Bool)
    -> IOEnv (Env TcGblEnv TcLclEnv) DynFlags
    -> TcRnIf TcGblEnv TcLclEnv Bool
    forall a b.
    (a -> b)
    -> IOEnv (Env TcGblEnv TcLclEnv) a
    -> IOEnv (Env TcGblEnv TcLclEnv) b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap (Extension -> DynFlags -> Bool
    xopt Extension
    LangExt.OverloadedStrings) IOEnv (Env TcGblEnv TcLclEnv) DynFlags
    forall (m :: * -> *). HasDynFlags m => m DynFlags
    getDynFlags
          ; xRebindableSyntax <- fmap (xopt LangExt.RebindableSyntax) getDynFlags
          ; (fail, fvs) <- reallyGetMonadFailOp xRebindableSyntax xOverloadedStrings
          ; return (Just fail, fvs)
          }
      where
        isQualifiedDo :: Bool
    isQualifiedDo = Maybe ModuleName -> Bool
    forall a. Maybe a -> Bool
    isJust (HsStmtContext fn -> Maybe ModuleName
    forall fn. HsStmtContext fn -> Maybe ModuleName
    qualifiedDoModuleName_maybe HsStmtContext fn
    ctxt)

        reallyGetMonadFailOp :: Bool
    -> Bool -> IOEnv (Env TcGblEnv TcLclEnv) (SyntaxExprRn, FreeVars)
    reallyGetMonadFailOp Bool
    rebindableSyntax Bool
    overloadedStrings
          | (Bool
    isQualifiedDo Bool -> Bool -> Bool
    || Bool
    rebindableSyntax) Bool -> Bool -> Bool
    && Bool
    overloadedStrings = do
            (failExpr, failFvs) <- HsStmtContext fn -> Name -> TcM (HsExpr GhcRn, FreeVars)
    forall fn. HsStmtContext fn -> Name -> TcM (HsExpr GhcRn, FreeVars)
    lookupQualifiedDoExpr HsStmtContext fn
    ctxt Name
    failMName
            (fromStringExpr, fromStringFvs) <- lookupSyntaxExpr fromStringName
            let arg_lit = FastString -> OccName
    mkVarOccFS (String -> FastString
    fsLit String
    "arg")
            arg_name <- newSysName arg_lit
            let arg_syn_expr = IdP GhcRn -> XRec GhcRn (HsExpr GhcRn)
    forall (p :: Pass) a.
    IsSrcSpanAnn p a =>
    IdP (GhcPass p) -> LHsExpr (GhcPass p)
    nlHsVar IdP GhcRn
    Name
    arg_name
                body :: LHsExpr GhcRn =
                  nlHsApp (noLocA failExpr)
                          (nlHsApp (noLocA $ fromStringExpr) arg_syn_expr)
            let failAfterFromStringExpr :: HsExpr GhcRn =
                  unLoc $ mkHsLam [noLocA $ VarPat noExtField $ noLocA arg_name] body
            let failAfterFromStringSynExpr :: SyntaxExpr GhcRn =
                  mkSyntaxExpr failAfterFromStringExpr
            return (failAfterFromStringSynExpr, failFvs `plusFV` fromStringFvs)
          | Bool
    otherwise = HsStmtContext fn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    forall fn.
    HsStmtContext fn -> Name -> RnM (SyntaxExpr GhcRn, FreeVars)
    lookupQualifiedDo HsStmtContext fn
    ctxt Name
    failMName

    {- *********************************************************************
    *                                                                      *
                  Generating code for ExpandedThingRn
          See Note [Handling overloaded and rebindable constructs]
    *                                                                      *
    ********************************************************************* -}

    -- | Expand `HsIf` if rebindable syntax is turned on
    --   See Note [Handling overloaded and rebindable constructs]
    rnHsIf :: LHsExpr GhcPs -> LHsExpr GhcPs -> LHsExpr GhcPs -> RnM (HsExpr GhcRn, FreeVars)
    rnHsIf :: LHsExpr GhcPs
    -> LHsExpr GhcPs -> LHsExpr GhcPs -> TcM (HsExpr GhcRn, FreeVars)
    rnHsIf LHsExpr GhcPs
    p LHsExpr GhcPs
    b1 LHsExpr GhcPs
    b2
      = do { (p',  fvP)  <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    p
           ; (b1', fvB1) <- rnLExpr b1
           ; (b2', fvB2) <- rnLExpr b2
           ; let fvs_if = [FreeVars] -> FreeVars
    plusFVs [FreeVars
    fvP, FreeVars
    fvB1, FreeVars
    fvB2]
                 rn_if  = XIf GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    forall p. XIf p -> LHsExpr p -> LHsExpr p -> LHsExpr p -> HsExpr p
    HsIf XIf GhcRn
    NoExtField
    noExtField  XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    p' XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    b1' XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    b2'

           -- Deal with rebindable syntax
           ; mb_ite <- lookupIfThenElse
           ; case mb_ite of
                Maybe Name
    Nothing  -- Non rebindable-syntax case
                  -> (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (HsExpr GhcRn
    rn_if, FreeVars
    fvs_if)

                Just Name
    ite_name   -- Rebindable-syntax case
                  -> do { let ds_if :: HsExpr GhcRn
    ds_if = Name -> [XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn
    genHsApps Name
    ite_name [XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    p', XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    b1', XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    b2']
                              fvs :: FreeVars
    fvs   = [FreeVars] -> FreeVars
    plusFVs [FreeVars
    fvs_if, Name -> FreeVars
    unitFV Name
    ite_name]
                        ; (HsExpr GhcRn, FreeVars) -> TcM (HsExpr GhcRn, FreeVars)
    forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (HsExpr GhcRn -> HsExpr GhcRn -> HsExpr GhcRn
    mkExpandedExpr HsExpr GhcRn
    rn_if HsExpr GhcRn
    ds_if, FreeVars
    fvs) } }

    -----------------------------------------
    -- Bits and pieces for RecordDotSyntax.
    --
    -- See Note [Overview of record dot syntax] in GHC.Hs.Expr.

    -- mkGetField arg field calculates a get_field @field arg expression.
    -- e.g. z.x = mkGetField z x = get_field @x z
    mkGetField :: Name -> LHsExpr GhcRn -> LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
    mkGetField :: Name
    -> XRec GhcRn (HsExpr GhcRn)
    -> LocatedAn NoEpAnns FieldLabelString
    -> HsExpr GhcRn
    mkGetField Name
    get_field XRec GhcRn (HsExpr GhcRn)
    arg LocatedAn NoEpAnns FieldLabelString
    field = GenLocated SrcSpanAnnA (HsExpr GhcRn) -> HsExpr GhcRn
    forall l e. GenLocated l e -> e
    unLoc ([XRec GhcRn (HsExpr GhcRn)] -> XRec GhcRn (HsExpr GhcRn)
    forall a. HasCallStack => [a] -> a
    head ([XRec GhcRn (HsExpr GhcRn)] -> XRec GhcRn (HsExpr GhcRn))
    -> [XRec GhcRn (HsExpr GhcRn)] -> XRec GhcRn (HsExpr GhcRn)
    forall a b. (a -> b) -> a -> b
    $ Name
    -> [XRec GhcRn (HsExpr GhcRn)]
    -> LocatedAn NoEpAnns FieldLabelString
    -> [XRec GhcRn (HsExpr GhcRn)]
    mkGet Name
    get_field [XRec GhcRn (HsExpr GhcRn)
    arg] LocatedAn NoEpAnns FieldLabelString
    field)

    -- mkSetField a field b calculates a set_field @field expression.
    -- e.g mkSetSetField a field b = set_field @"field" a b (read as "set field 'field' on a to b").
    mkSetField :: Name -> LHsExpr GhcRn -> LocatedAn NoEpAnns FieldLabelString -> LHsExpr GhcRn -> HsExpr GhcRn
    mkSetField :: Name
    -> XRec GhcRn (HsExpr GhcRn)
    -> LocatedAn NoEpAnns FieldLabelString
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    mkSetField Name
    set_field XRec GhcRn (HsExpr GhcRn)
    a (L EpAnn NoEpAnns
    _ (FieldLabelString FastString
    field)) XRec GhcRn (HsExpr GhcRn)
    b =
      HsExpr GhcRn -> XRec GhcRn (HsExpr GhcRn) -> HsExpr GhcRn
    genHsApp (HsExpr GhcRn -> XRec GhcRn (HsExpr GhcRn) -> HsExpr GhcRn
    genHsApp (Name -> HsExpr GhcRn
    genHsVar Name
    set_field HsExpr GhcRn -> HsType (NoGhcTc GhcRn) -> HsExpr GhcRn
    `genAppType` FastString -> HsType GhcRn
    genHsTyLit FastString
    field)  XRec GhcRn (HsExpr GhcRn)
    a) XRec GhcRn (HsExpr GhcRn)
    b

    mkGet :: Name -> [LHsExpr GhcRn] -> LocatedAn NoEpAnns FieldLabelString -> [LHsExpr GhcRn]
    mkGet :: Name
    -> [XRec GhcRn (HsExpr GhcRn)]
    -> LocatedAn NoEpAnns FieldLabelString
    -> [XRec GhcRn (HsExpr GhcRn)]
    mkGet Name
    get_field l :: [XRec GhcRn (HsExpr GhcRn)]
    l@(XRec GhcRn (HsExpr GhcRn)
    r : [XRec GhcRn (HsExpr GhcRn)]
    _) (L EpAnn NoEpAnns
    _ (FieldLabelString FastString
    field)) =
      HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall an a. NoAnn an => a -> LocatedAn an a
    wrapGenSpan (HsExpr GhcRn -> XRec GhcRn (HsExpr GhcRn) -> HsExpr GhcRn
    genHsApp (Name -> HsExpr GhcRn
    genHsVar Name
    get_field HsExpr GhcRn -> HsType (NoGhcTc GhcRn) -> HsExpr GhcRn
    `genAppType` FastString -> HsType GhcRn
    genHsTyLit FastString
    field) XRec GhcRn (HsExpr GhcRn)
    r) GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    forall a. a -> [a] -> [a]
    : [XRec GhcRn (HsExpr GhcRn)]
    [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    l
    mkGet Name
    _ [] LocatedAn NoEpAnns FieldLabelString
    _ = String -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    forall a. HasCallStack => String -> a
    panic String
    "mkGet : The impossible has happened!"

    mkSet :: Name -> LHsExpr GhcRn -> (LocatedAn NoEpAnns FieldLabelString, LHsExpr GhcRn) -> LHsExpr GhcRn
    mkSet :: Name
    -> XRec GhcRn (HsExpr GhcRn)
    -> (LocatedAn NoEpAnns FieldLabelString, XRec GhcRn (HsExpr GhcRn))
    -> XRec GhcRn (HsExpr GhcRn)
    mkSet Name
    set_field XRec GhcRn (HsExpr GhcRn)
    acc (LocatedAn NoEpAnns FieldLabelString
    field, XRec GhcRn (HsExpr GhcRn)
    g) = HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall an a. NoAnn an => a -> LocatedAn an a
    wrapGenSpan (Name
    -> XRec GhcRn (HsExpr GhcRn)
    -> LocatedAn NoEpAnns FieldLabelString
    -> XRec GhcRn (HsExpr GhcRn)
    -> HsExpr GhcRn
    mkSetField Name
    set_field XRec GhcRn (HsExpr GhcRn)
    g LocatedAn NoEpAnns FieldLabelString
    field XRec GhcRn (HsExpr GhcRn)
    acc)

    -- mkProjection fields calculates a projection.
    -- e.g. .x = mkProjection [x] = getField @"x"
    --      .x.y = mkProjection [.x, .y] = (.y) . (.x) = getField @"y" . getField @"x"
    mkProjection :: Name -> Name -> NonEmpty (LocatedAn NoEpAnns FieldLabelString) -> HsExpr GhcRn
    mkProjection :: Name
    -> Name
    -> NonEmpty (LocatedAn NoEpAnns FieldLabelString)
    -> HsExpr GhcRn
    mkProjection Name
    getFieldName Name
    circName (LocatedAn NoEpAnns FieldLabelString
    field :| [LocatedAn NoEpAnns FieldLabelString]
    fields) = (HsExpr GhcRn
     -> LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn)
    -> HsExpr GhcRn
    -> [LocatedAn NoEpAnns FieldLabelString]
    -> HsExpr GhcRn
    forall b a. (b -> a -> b) -> b -> [a] -> b
    forall (t :: * -> *) b a.
    Foldable t =>
    (b -> a -> b) -> b -> t a -> b
    foldl' HsExpr GhcRn -> LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
    f (LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
    proj LocatedAn NoEpAnns FieldLabelString
    field) [LocatedAn NoEpAnns FieldLabelString]
    fields
      where
        f :: HsExpr GhcRn -> LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
        f :: HsExpr GhcRn -> LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
    f HsExpr GhcRn
    acc LocatedAn NoEpAnns FieldLabelString
    field = Name -> [XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn
    genHsApps Name
    circName ([XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn)
    -> [XRec GhcRn (HsExpr GhcRn)] -> HsExpr GhcRn
    forall a b. (a -> b) -> a -> b
    $ (HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> [HsExpr GhcRn] -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    forall a b. (a -> b) -> [a] -> [b]
    map HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall an a. NoAnn an => a -> LocatedAn an a
    wrapGenSpan [LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
    proj LocatedAn NoEpAnns FieldLabelString
    field, HsExpr GhcRn
    acc]

        proj :: LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
        proj :: LocatedAn NoEpAnns FieldLabelString -> HsExpr GhcRn
    proj (L EpAnn NoEpAnns
    _ (FieldLabelString FastString
    f)) = Name -> HsExpr GhcRn
    genHsVar Name
    getFieldName HsExpr GhcRn -> HsType (NoGhcTc GhcRn) -> HsExpr GhcRn
    `genAppType` FastString -> HsType GhcRn
    genHsTyLit FastString
    f

    -- mkProjUpdateSetField calculates functions representing dot notation record updates.
    -- e.g. Suppose an update like foo.bar = 1.
    --      We calculate the function \a -> setField @"foo" a (setField @"bar" (getField @"foo" a) 1).
    mkProjUpdateSetField :: Name -> Name -> LHsRecProj GhcRn (LHsExpr GhcRn) -> (LHsExpr GhcRn -> LHsExpr GhcRn)
    mkProjUpdateSetField :: Name
    -> Name
    -> LHsRecUpdProj GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    mkProjUpdateSetField Name
    get_field Name
    set_field (L SrcSpanAnnA
    _ (HsFieldBind { hfbLHS :: forall lhs rhs. HsFieldBind lhs rhs -> lhs
    hfbLHS = (L EpAnn NoEpAnns
    _ (FieldLabelStrings [XRec GhcRn (DotFieldOcc GhcRn)]
    flds')), hfbRHS :: forall lhs rhs. HsFieldBind lhs rhs -> rhs
    hfbRHS = GenLocated SrcSpanAnnA (HsExpr GhcRn)
    arg } ))
      = let {
          ; flds :: [LocatedAn NoEpAnns FieldLabelString]
    flds = (LocatedAn NoEpAnns (DotFieldOcc GhcRn)
     -> LocatedAn NoEpAnns FieldLabelString)
    -> [LocatedAn NoEpAnns (DotFieldOcc GhcRn)]
    -> [LocatedAn NoEpAnns FieldLabelString]
    forall a b. (a -> b) -> [a] -> [b]
    map ((DotFieldOcc GhcRn -> FieldLabelString)
    -> LocatedAn NoEpAnns (DotFieldOcc GhcRn)
    -> LocatedAn NoEpAnns FieldLabelString
    forall a b.
    (a -> b)
    -> GenLocated (EpAnn NoEpAnns) a -> GenLocated (EpAnn NoEpAnns) b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap (GenLocated SrcSpanAnnN FieldLabelString -> FieldLabelString
    forall l e. GenLocated l e -> e
    unLoc (GenLocated SrcSpanAnnN FieldLabelString -> FieldLabelString)
    -> (DotFieldOcc GhcRn -> GenLocated SrcSpanAnnN FieldLabelString)
    -> DotFieldOcc GhcRn
    -> FieldLabelString
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . DotFieldOcc GhcRn -> XRec GhcRn FieldLabelString
    DotFieldOcc GhcRn -> GenLocated SrcSpanAnnN FieldLabelString
    forall p. DotFieldOcc p -> XRec p FieldLabelString
    dfoLabel)) [XRec GhcRn (DotFieldOcc GhcRn)]
    [LocatedAn NoEpAnns (DotFieldOcc GhcRn)]
    flds'
          ; final :: LocatedAn NoEpAnns FieldLabelString
    final = [LocatedAn NoEpAnns FieldLabelString]
    -> LocatedAn NoEpAnns FieldLabelString
    forall a. HasCallStack => [a] -> a
    last [LocatedAn NoEpAnns FieldLabelString]
    flds  -- quux
          ; fields :: [LocatedAn NoEpAnns FieldLabelString]
    fields = [LocatedAn NoEpAnns FieldLabelString]
    -> [LocatedAn NoEpAnns FieldLabelString]
    forall a. HasCallStack => [a] -> [a]
    init [LocatedAn NoEpAnns FieldLabelString]
    flds   -- [foo, bar, baz]
          ; getters :: GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    getters = \GenLocated SrcSpanAnnA (HsExpr GhcRn)
    a -> ([GenLocated SrcSpanAnnA (HsExpr GhcRn)]
     -> LocatedAn NoEpAnns FieldLabelString
     -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)])
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    -> [LocatedAn NoEpAnns FieldLabelString]
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    forall b a. (b -> a -> b) -> b -> [a] -> b
    forall (t :: * -> *) b a.
    Foldable t =>
    (b -> a -> b) -> b -> t a -> b
    foldl' (Name
    -> [XRec GhcRn (HsExpr GhcRn)]
    -> LocatedAn NoEpAnns FieldLabelString
    -> [XRec GhcRn (HsExpr GhcRn)]
    mkGet Name
    get_field) [GenLocated SrcSpanAnnA (HsExpr GhcRn)
    a] [LocatedAn NoEpAnns FieldLabelString]
    fields  -- Ordered from deep to shallow.
              -- [getField@"baz"(getField@"bar"(getField@"foo" a), getField@"bar"(getField@"foo" a), getField@"foo" a, a]
          ; zips :: GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> [(LocatedAn NoEpAnns FieldLabelString,
         GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    zips = \GenLocated SrcSpanAnnA (HsExpr GhcRn)
    a -> (LocatedAn NoEpAnns FieldLabelString
    final, [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall a. HasCallStack => [a] -> a
    head (GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    getters GenLocated SrcSpanAnnA (HsExpr GhcRn)
    a)) (LocatedAn NoEpAnns FieldLabelString,
     GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> [(LocatedAn NoEpAnns FieldLabelString,
         GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    -> [(LocatedAn NoEpAnns FieldLabelString,
         GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    forall a. a -> [a] -> [a]
    : [LocatedAn NoEpAnns FieldLabelString]
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    -> [(LocatedAn NoEpAnns FieldLabelString,
         GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    forall a b. [a] -> [b] -> [(a, b)]
    zip ([LocatedAn NoEpAnns FieldLabelString]
    -> [LocatedAn NoEpAnns FieldLabelString]
    forall a. [a] -> [a]
    reverse [LocatedAn NoEpAnns FieldLabelString]
    fields) ([GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    forall a. HasCallStack => [a] -> [a]
    tail (GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> [GenLocated SrcSpanAnnA (HsExpr GhcRn)]
    getters GenLocated SrcSpanAnnA (HsExpr GhcRn)
    a)) -- Ordered from deep to shallow.
              -- [("quux", getField@"baz"(getField@"bar"(getField@"foo" a)), ("baz", getField@"bar"(getField@"foo" a)), ("bar", getField@"foo" a), ("foo", a)]
          }
        in (\XRec GhcRn (HsExpr GhcRn)
    a -> (GenLocated SrcSpanAnnA (HsExpr GhcRn)
     -> (LocatedAn NoEpAnns FieldLabelString,
         GenLocated SrcSpanAnnA (HsExpr GhcRn))
     -> GenLocated SrcSpanAnnA (HsExpr GhcRn))
    -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> [(LocatedAn NoEpAnns FieldLabelString,
         GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall b a. (b -> a -> b) -> b -> [a] -> b
    forall (t :: * -> *) b a.
    Foldable t =>
    (b -> a -> b) -> b -> t a -> b
    foldl' (Name
    -> XRec GhcRn (HsExpr GhcRn)
    -> (LocatedAn NoEpAnns FieldLabelString, XRec GhcRn (HsExpr GhcRn))
    -> XRec GhcRn (HsExpr GhcRn)
    mkSet Name
    set_field) GenLocated SrcSpanAnnA (HsExpr GhcRn)
    arg (GenLocated SrcSpanAnnA (HsExpr GhcRn)
    -> [(LocatedAn NoEpAnns FieldLabelString,
         GenLocated SrcSpanAnnA (HsExpr GhcRn))]
    zips XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    a))
              -- setField@"foo" (a) (setField@"bar" (getField @"foo" (a))(setField@"baz" (getField @"bar" (getField @"foo" (a)))(setField@"quux" (getField @"baz" (getField @"bar" (getField @"foo" (a))))(quux))))

    mkRecordDotUpd :: Name -> Name -> LHsExpr GhcRn -> [LHsRecUpdProj GhcRn] -> HsExpr GhcRn
    mkRecordDotUpd :: Name
    -> Name
    -> XRec GhcRn (HsExpr GhcRn)
    -> [LHsRecUpdProj GhcRn]
    -> HsExpr GhcRn
    mkRecordDotUpd Name
    get_field Name
    set_field XRec GhcRn (HsExpr GhcRn)
    exp [LHsRecUpdProj GhcRn]
    updates = (HsExpr GhcRn
     -> GenLocated
          SrcSpanAnnA
          (HsFieldBind
             (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
             (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
     -> HsExpr GhcRn)
    -> HsExpr GhcRn
    -> [GenLocated
          SrcSpanAnnA
          (HsFieldBind
             (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
             (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    -> HsExpr GhcRn
    forall b a. (b -> a -> b) -> b -> [a] -> b
    forall (t :: * -> *) b a.
    Foldable t =>
    (b -> a -> b) -> b -> t a -> b
    foldl' HsExpr GhcRn -> LHsRecUpdProj GhcRn -> HsExpr GhcRn
    HsExpr GhcRn
    -> GenLocated
         SrcSpanAnnA
         (HsFieldBind
            (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
            (GenLocated SrcSpanAnnA (HsExpr GhcRn)))
    -> HsExpr GhcRn
    fieldUpdate (GenLocated SrcSpanAnnA (HsExpr GhcRn) -> HsExpr GhcRn
    forall l e. GenLocated l e -> e
    unLoc XRec GhcRn (HsExpr GhcRn)
    GenLocated SrcSpanAnnA (HsExpr GhcRn)
    exp) [LHsRecUpdProj GhcRn]
    [GenLocated
       SrcSpanAnnA
       (HsFieldBind
          (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
          (GenLocated SrcSpanAnnA (HsExpr GhcRn)))]
    updates
      where
        fieldUpdate :: HsExpr GhcRn -> LHsRecUpdProj GhcRn -> HsExpr GhcRn
        fieldUpdate :: HsExpr GhcRn -> LHsRecUpdProj GhcRn -> HsExpr GhcRn
    fieldUpdate HsExpr GhcRn
    acc LHsRecUpdProj GhcRn
    lpu =  GenLocated SrcSpanAnnA (HsExpr GhcRn) -> HsExpr GhcRn
    forall l e. GenLocated l e -> e
    unLoc (GenLocated SrcSpanAnnA (HsExpr GhcRn) -> HsExpr GhcRn)
    -> GenLocated SrcSpanAnnA (HsExpr GhcRn) -> HsExpr GhcRn
    forall a b. (a -> b) -> a -> b
    $ (Name
    -> Name
    -> LHsRecUpdProj GhcRn
    -> XRec GhcRn (HsExpr GhcRn)
    -> XRec GhcRn (HsExpr GhcRn)
    mkProjUpdateSetField Name
    get_field Name
    set_field LHsRecUpdProj GhcRn
    lpu) (HsExpr GhcRn -> GenLocated SrcSpanAnnA (HsExpr GhcRn)
    forall an a. NoAnn an => a -> LocatedAn an a
    wrapGenSpan HsExpr GhcRn
    acc)

    rnHsUpdProjs :: [LHsRecUpdProj GhcPs] -> RnM ([LHsRecUpdProj GhcRn], FreeVars)
    rnHsUpdProjs :: [LHsRecUpdProj GhcPs] -> RnM ([LHsRecUpdProj GhcRn], FreeVars)
    rnHsUpdProjs [LHsRecUpdProj GhcPs]
    us = do
      (u, fvs) <- [(GenLocated
        SrcSpanAnnA
        (HsFieldBind
           (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
           (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
      FreeVars)]
    -> ([GenLocated
           SrcSpanAnnA
           (HsFieldBind
              (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
              (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
        [FreeVars])
    forall a b. [(a, b)] -> ([a], [b])
    unzip ([(GenLocated
         SrcSpanAnnA
         (HsFieldBind
            (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
            (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
       FreeVars)]
     -> ([GenLocated
            SrcSpanAnnA
            (HsFieldBind
               (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
               (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
         [FreeVars]))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA
             (HsFieldBind
                (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
                (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars)]
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         ([GenLocated
             SrcSpanAnnA
             (HsFieldBind
                (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
                (GenLocated SrcSpanAnnA (HsExpr GhcRn)))],
          [FreeVars])
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> (GenLocated
       SrcSpanAnnA
       (HsFieldBind
          (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
          (GenLocated SrcSpanAnnA (HsExpr GhcPs)))
     -> IOEnv
          (Env TcGblEnv TcLclEnv)
          (GenLocated
             SrcSpanAnnA
             (HsFieldBind
                (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
                (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars))
    -> [GenLocated
          SrcSpanAnnA
          (HsFieldBind
             (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
             (GenLocated SrcSpanAnnA (HsExpr GhcPs)))]
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         [(GenLocated
             SrcSpanAnnA
             (HsFieldBind
                (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
                (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
           FreeVars)]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM LHsRecUpdProj GhcPs -> RnM (LHsRecUpdProj GhcRn, FreeVars)
    GenLocated
      SrcSpanAnnA
      (HsFieldBind
         (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
         (GenLocated SrcSpanAnnA (HsExpr GhcPs)))
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (GenLocated
            SrcSpanAnnA
            (HsFieldBind
               (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcRn))
               (GenLocated SrcSpanAnnA (HsExpr GhcRn))),
          FreeVars)
    rnRecUpdProj [LHsRecUpdProj GhcPs]
    [GenLocated
       SrcSpanAnnA
       (HsFieldBind
          (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
          (GenLocated SrcSpanAnnA (HsExpr GhcPs)))]
    us
      pure (u, plusFVs fvs)
      where
        rnRecUpdProj :: LHsRecUpdProj GhcPs -> RnM (LHsRecUpdProj GhcRn, FreeVars)
        rnRecUpdProj :: LHsRecUpdProj GhcPs -> RnM (LHsRecUpdProj GhcRn, FreeVars)
    rnRecUpdProj (L SrcSpanAnnA
    l (HsFieldBind XHsFieldBind
      (GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs))
    _ GenLocated (EpAnn NoEpAnns) (FieldLabelStrings GhcPs)
    fs GenLocated SrcSpanAnnA (HsExpr GhcPs)
    arg Bool
    pun))
          = do { (arg, fv) <- LHsExpr GhcPs -> RnM (XRec GhcRn (HsExpr GhcRn), FreeVars)
    rnLExpr LHsExpr GhcPs
    GenLocated SrcSpanAnnA (HsExpr GhcPs)
    arg
               ; return $
                   (L l (HsFieldBind {
                             hfbAnn = noAnn
                           , hfbLHS = fmap rnFieldLabelStrings fs
                           , hfbRHS = arg
                           , hfbPun = pun }), fv ) }