    {-# LANGUAGE CPP              #-}
    {-# LANGUAGE ConstraintKinds  #-}
    {-# LANGUAGE FlexibleContexts #-}
    {-# LANGUAGE RankNTypes       #-}
    {-# LANGUAGE RecordWildCards  #-}
    {-# LANGUAGE TupleSections    #-}
    {-# LANGUAGE TypeFamilies     #-}

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

    {-
    (c) The University of Glasgow 2006
    (c) The GRASP/AQUA Project, Glasgow University, 1992-1998

    -}

    -- | Typecheck some @Matches@
    module GHC.Tc.Gen.Match
       ( tcMatchesFun
       , tcGRHS
       , tcGRHSsPat
       , tcMatchesCase
       , tcMatchLambda
       , TcMatchCtxt(..)
       , TcStmtChecker
       , TcExprStmtChecker
       , TcCmdStmtChecker
       , tcStmts
       , tcStmtsAndThen
       , tcDoStmts
       , tcBody
       , tcDoStmt
       , tcGuardStmt
       )
    where

    import GHC.Prelude

    import {-# SOURCE #-}   GHC.Tc.Gen.Expr( tcSyntaxOp, tcInferRho, tcInferRhoNC
                                           , tcMonoExpr, tcMonoExprNC, tcExpr
                                           , tcCheckMonoExpr, tcCheckMonoExprNC
                                           , tcCheckPolyExpr )

    import GHC.Tc.Utils.Monad
    import GHC.Tc.Utils.Env
    import GHC.Tc.Gen.Pat
    import GHC.Tc.Gen.Head( tcCheckId )
    import GHC.Tc.Utils.TcMType
    import GHC.Tc.Utils.TcType
    import GHC.Tc.Gen.Bind
    import GHC.Tc.Utils.Unify
    import GHC.Tc.Types.Origin
    import GHC.Tc.Types.Evidence

    import GHC.Core.Multiplicity
    import GHC.Core.UsageEnv
    import GHC.Core.TyCon
    -- Create chunkified tuple tybes for monad comprehensions
    import GHC.Core.Make

    import GHC.Hs

    import GHC.Builtin.Types
    import GHC.Builtin.Types.Prim

    import GHC.Utils.Outputable
    import GHC.Utils.Panic
    import GHC.Utils.Misc
    import GHC.Driver.Session ( getDynFlags )

    import GHC.Types.Fixity (LexicalFixity(..))
    import GHC.Types.Name
    import GHC.Types.Id
    import GHC.Types.SrcLoc

    import Control.Monad
    import Control.Arrow ( second )

    #include "HsVersions.h"

    {-
    ************************************************************************
    *                                                                      *
    \subsection{tcMatchesFun, tcMatchesCase}
    *                                                                      *
    ************************************************************************

    @tcMatchesFun@ typechecks a @[Match]@ list which occurs in a
    @FunMonoBind@.  The second argument is the name of the function, which
    is used in error messages.  It checks that all the equations have the
    same number of arguments before using @tcMatches@ to do the work.
    -}

    tcMatchesFun :: LocatedN Name
                 -> MatchGroup GhcRn (LHsExpr GhcRn)
                 -> ExpRhoType    -- Expected type of function
                 -> TcM (HsWrapper, MatchGroup GhcTc (LHsExpr GhcTc))
                                    -- Returns type of body
    tcMatchesFun :: GenLocated SrcSpanAnnN Name
    -> MatchGroup GhcRn (LHsExpr GhcRn)
    -> ExpRhoType
    -> TcM (HsWrapper, MatchGroup GhcTc (LHsExpr GhcTc))
    tcMatchesFun fn :: GenLocated SrcSpanAnnN Name
    fn@(L SrcSpanAnnN
    _ Name
    fun_name) MatchGroup GhcRn (LHsExpr GhcRn)
    matches ExpRhoType
    exp_ty
      = do  {  -- Check that they all have the same no of arguments
               -- Location is in the monad, set the caller so that
               -- any inter-equation error messages get some vaguely
               -- sensible location.        Note: we have to do this odd
               -- ann-grabbing, because we don't always have annotations in
               -- hand when we call tcMatchesFun...
              String -> SDoc -> TcRn ()
    traceTc String
    "tcMatchesFun" (forall a. Outputable a => a -> SDoc
    ppr Name
    fun_name SDoc -> SDoc -> SDoc
    $$ forall a. Outputable a => a -> SDoc
    ppr ExpRhoType
    exp_ty)
            ; forall (body :: * -> *).
    AnnoBody body =>
    Name -> MatchGroup GhcRn (LocatedA (body GhcRn)) -> TcRn ()
    checkArgs Name
    fun_name MatchGroup GhcRn (LHsExpr GhcRn)
    matches

            ; forall a.
    SDoc
    -> UserTypeCtxt
    -> Arity
    -> ExpRhoType
    -> ([Scaled ExpRhoType] -> ExpRhoType -> TcM a)
    -> TcM (HsWrapper, a)
    matchExpectedFunTys SDoc
    herald UserTypeCtxt
    ctxt Arity
    arity ExpRhoType
    exp_ty forall a b. (a -> b) -> a -> b
    $ \ [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty ->
                 -- NB: exp_type may be polymorphic, but
                 --     matchExpectedFunTys can cope with that
              forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    Many forall a b. (a -> b) -> a -> b
    $
              -- toplevel bindings and let bindings are, at the
              -- moment, always unrestricted. The value being bound
              -- must, accordingly, be unrestricted. Hence them
              -- being scaled by Many. When let binders come with a
              -- multiplicity, then @tcMatchesFun@ will have to take
              -- a multiplicity argument, and scale accordingly.
              forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> MatchGroup GhcRn (LocatedA (body GhcRn))
    -> TcM (MatchGroup GhcTc (LocatedA (body GhcTc)))
    tcMatches TcMatchCtxt HsExpr
    match_ctxt [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty MatchGroup GhcRn (LHsExpr GhcRn)
    matches }
      where
        arity :: Arity
    arity  = forall (id :: Pass) body. MatchGroup (GhcPass id) body -> Arity
    matchGroupArity MatchGroup GhcRn (LHsExpr GhcRn)
    matches
        herald :: SDoc
    herald = String -> SDoc
    text String
    "The equation(s) for"
                 SDoc -> SDoc -> SDoc
    <+> SDoc -> SDoc
    quotes (forall a. Outputable a => a -> SDoc
    ppr Name
    fun_name) SDoc -> SDoc -> SDoc
    <+> String -> SDoc
    text String
    "have"
        ctxt :: UserTypeCtxt
    ctxt   = UserTypeCtxt
    GenSigCtxt  -- Was: FunSigCtxt fun_name True
                             -- But that's wrong for f :: Int -> forall a. blah
        what :: HsMatchContext GhcRn
    what   = FunRhs { mc_fun :: LIdP GhcRn
    mc_fun = GenLocated SrcSpanAnnN Name
    fn, mc_fixity :: LexicalFixity
    mc_fixity = LexicalFixity
    Prefix, mc_strictness :: SrcStrictness
    mc_strictness = SrcStrictness
    strictness }
        match_ctxt :: TcMatchCtxt HsExpr
    match_ctxt = MC { mc_what :: HsMatchContext GhcRn
    mc_what = HsMatchContext GhcRn
    what, mc_body :: LocatedA (HsExpr GhcRn)
    -> ExpRhoType -> TcM (LocatedA (HsExpr GhcTc))
    mc_body = LHsExpr GhcRn -> ExpRhoType -> TcM (LHsExpr GhcTc)
    tcBody }
        strictness :: SrcStrictness
    strictness
          | [L Anno (Match GhcRn (LocatedA (HsExpr GhcRn)))
    _ Match GhcRn (LocatedA (HsExpr GhcRn))
    match] <- forall l e. GenLocated l e -> e
    unLoc forall a b. (a -> b) -> a -> b
    $ forall p body. MatchGroup p body -> XRec p [LMatch p body]
    mg_alts MatchGroup GhcRn (LHsExpr GhcRn)
    matches
          , FunRhs{ mc_strictness :: forall p. HsMatchContext p -> SrcStrictness
    mc_strictness = SrcStrictness
    SrcStrict } <- forall p body. Match p body -> HsMatchContext (NoGhcTc p)
    m_ctxt Match GhcRn (LocatedA (HsExpr GhcRn))
    match
          = SrcStrictness
    SrcStrict
          | Bool
    otherwise
          = SrcStrictness
    NoSrcStrict

    {-
    @tcMatchesCase@ doesn't do the argument-count check because the
    parser guarantees that each equation has exactly one argument.
    -}

    tcMatchesCase :: (AnnoBody body) =>
                    TcMatchCtxt body                         -- Case context
                 -> Scaled TcSigmaType                       -- Type of scrutinee
                 -> MatchGroup GhcRn (LocatedA (body GhcRn)) -- The case alternatives
                 -> ExpRhoType                    -- Type of whole case expressions
                 -> TcM (MatchGroup GhcTc (LocatedA (body GhcTc)))
                    -- Translated alternatives
                    -- wrapper goes from MatchGroup's ty to expected ty

    tcMatchesCase :: forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> Scaled Mult
    -> MatchGroup GhcRn (LocatedA (body GhcRn))
    -> ExpRhoType
    -> TcM (MatchGroup GhcTc (LocatedA (body GhcTc)))
    tcMatchesCase TcMatchCtxt body
    ctxt (Scaled Mult
    scrut_mult Mult
    scrut_ty) MatchGroup GhcRn (LocatedA (body GhcRn))
    matches ExpRhoType
    res_ty
      = forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> MatchGroup GhcRn (LocatedA (body GhcRn))
    -> TcM (MatchGroup GhcTc (LocatedA (body GhcTc)))
    tcMatches TcMatchCtxt body
    ctxt [forall a. Mult -> a -> Scaled a
    Scaled Mult
    scrut_mult (Mult -> ExpRhoType
    mkCheckExpType Mult
    scrut_ty)] ExpRhoType
    res_ty MatchGroup GhcRn (LocatedA (body GhcRn))
    matches

    tcMatchLambda :: SDoc -- see Note [Herald for matchExpectedFunTys] in GHC.Tc.Utils.Unify
                  -> TcMatchCtxt HsExpr
                  -> MatchGroup GhcRn (LHsExpr GhcRn)
                  -> ExpRhoType
                  -> TcM (HsWrapper, MatchGroup GhcTc (LHsExpr GhcTc))
    tcMatchLambda :: SDoc
    -> TcMatchCtxt HsExpr
    -> MatchGroup GhcRn (LHsExpr GhcRn)
    -> ExpRhoType
    -> TcM (HsWrapper, MatchGroup GhcTc (LHsExpr GhcTc))
    tcMatchLambda SDoc
    herald TcMatchCtxt HsExpr
    match_ctxt MatchGroup GhcRn (LHsExpr GhcRn)
    match ExpRhoType
    res_ty
      = forall a.
    SDoc
    -> UserTypeCtxt
    -> Arity
    -> ExpRhoType
    -> ([Scaled ExpRhoType] -> ExpRhoType -> TcM a)
    -> TcM (HsWrapper, a)
    matchExpectedFunTys SDoc
    herald UserTypeCtxt
    GenSigCtxt Arity
    n_pats ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $ \ [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty ->
        forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> MatchGroup GhcRn (LocatedA (body GhcRn))
    -> TcM (MatchGroup GhcTc (LocatedA (body GhcTc)))
    tcMatches TcMatchCtxt HsExpr
    match_ctxt [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty MatchGroup GhcRn (LHsExpr GhcRn)
    match
      where
        n_pats :: Arity
    n_pats | forall (p :: Pass) body. MatchGroup (GhcPass p) body -> Bool
    isEmptyMatchGroup MatchGroup GhcRn (LHsExpr GhcRn)
    match = Arity
    1   -- must be lambda-case
               | Bool
    otherwise               = forall (id :: Pass) body. MatchGroup (GhcPass id) body -> Arity
    matchGroupArity MatchGroup GhcRn (LHsExpr GhcRn)
    match

    -- @tcGRHSsPat@ typechecks @[GRHSs]@ that occur in a @PatMonoBind@.

    tcGRHSsPat :: GRHSs GhcRn (LHsExpr GhcRn) -> ExpRhoType
               -> TcM (GRHSs GhcTc (LHsExpr GhcTc))
    -- Used for pattern bindings
    tcGRHSsPat :: GRHSs GhcRn (LHsExpr GhcRn)
    -> ExpRhoType -> TcM (GRHSs GhcTc (LHsExpr GhcTc))
    tcGRHSsPat GRHSs GhcRn (LHsExpr GhcRn)
    grhss ExpRhoType
    res_ty
      = forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    Many forall a b. (a -> b) -> a -> b
    $
          -- Like in tcMatchesFun, this scaling happens because all
          -- let bindings are unrestricted. A difference, here, is
          -- that when this is not the case, any more, we will have to
          -- make sure that the pattern is strict, otherwise this will
          -- desugar to incorrect code.
        forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> GRHSs GhcRn (LocatedA (body GhcRn))
    -> ExpRhoType
    -> TcM (GRHSs GhcTc (LocatedA (body GhcTc)))
    tcGRHSs TcMatchCtxt HsExpr
    match_ctxt GRHSs GhcRn (LHsExpr GhcRn)
    grhss ExpRhoType
    res_ty
      where
        match_ctxt :: TcMatchCtxt HsExpr -- AZ
        match_ctxt :: TcMatchCtxt HsExpr
    match_ctxt = MC { mc_what :: HsMatchContext GhcRn
    mc_what = forall p. HsMatchContext p
    PatBindRhs,
                          mc_body :: LocatedA (HsExpr GhcRn)
    -> ExpRhoType -> TcM (LocatedA (HsExpr GhcTc))
    mc_body = LHsExpr GhcRn -> ExpRhoType -> TcM (LHsExpr GhcTc)
    tcBody }

    {- *********************************************************************
    *                                                                      *
                    tcMatch
    *                                                                      *
    ********************************************************************* -}

    data TcMatchCtxt body   -- c.f. TcStmtCtxt, also in this module
      = MC { forall (body :: * -> *). TcMatchCtxt body -> HsMatchContext GhcRn
    mc_what :: HsMatchContext GhcRn,  -- What kind of thing this is
             forall (body :: * -> *).
    TcMatchCtxt body
    -> LocatedA (body GhcRn)
    -> ExpRhoType
    -> TcM (LocatedA (body GhcTc))
    mc_body :: LocatedA (body GhcRn)  -- Type checker for a body of
                                               -- an alternative
                     -> ExpRhoType
                     -> TcM (LocatedA (body GhcTc)) }

    type AnnoBody body
      = ( Outputable (body GhcRn)
        , Anno (Match GhcRn (LocatedA (body GhcRn))) ~ SrcSpanAnnA
        , Anno (Match GhcTc (LocatedA (body GhcTc))) ~ SrcSpanAnnA
        , Anno [LocatedA (Match GhcRn (LocatedA (body GhcRn)))] ~ SrcSpanAnnL
        , Anno [LocatedA (Match GhcTc (LocatedA (body GhcTc)))] ~ SrcSpanAnnL
        , Anno (GRHS GhcRn (LocatedA (body GhcRn))) ~ SrcSpan
        , Anno (GRHS GhcTc (LocatedA (body GhcTc))) ~ SrcSpan
        , Anno (StmtLR GhcRn GhcRn (LocatedA (body GhcRn))) ~ SrcSpanAnnA
        , Anno (StmtLR GhcTc GhcTc (LocatedA (body GhcTc))) ~ SrcSpanAnnA
        )

    -- | Type-check a MatchGroup.
    tcMatches :: (AnnoBody body ) => TcMatchCtxt body
              -> [Scaled ExpSigmaType]      -- Expected pattern types
              -> ExpRhoType          -- Expected result-type of the Match.
              -> MatchGroup GhcRn (LocatedA (body GhcRn))
              -> TcM (MatchGroup GhcTc (LocatedA (body GhcTc)))

    tcMatches :: forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> MatchGroup GhcRn (LocatedA (body GhcRn))
    -> TcM (MatchGroup GhcTc (LocatedA (body GhcTc)))
    tcMatches TcMatchCtxt body
    ctxt [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty (MG { mg_alts :: forall p body. MatchGroup p body -> XRec p [LMatch p body]
    mg_alts = L SrcSpanAnnL
    l [LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    matches
                                      , mg_origin :: forall p body. MatchGroup p body -> Origin
    mg_origin = Origin
    origin })
      | forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    matches  -- Deal with case e of {}
        -- Since there are no branches, no one else will fill in rhs_ty
        -- when in inference mode, so we must do it ourselves,
        -- here, using expTypeToType
      = do { UsageEnv -> TcRn ()
    tcEmitBindingUsage UsageEnv
    bottomUE
           ; [Scaled Mult]
    pat_tys <- forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    mapM Scaled ExpRhoType -> TcM (Scaled Mult)
    scaledExpTypeToType [Scaled ExpRhoType]
    pat_tys
           ; Mult
    rhs_ty  <- ExpRhoType -> TcM Mult
    expTypeToType ExpRhoType
    rhs_ty
           ; forall (m :: * -> *) a. Monad m => a -> m a
    return (MG { mg_alts :: XRec GhcTc [LMatch GhcTc (LocatedA (body GhcTc))]
    mg_alts = forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnL
    l []
                        , mg_ext :: XMG GhcTc (LocatedA (body GhcTc))
    mg_ext = [Scaled Mult] -> Mult -> MatchGroupTc
    MatchGroupTc [Scaled Mult]
    pat_tys Mult
    rhs_ty
                        , mg_origin :: Origin
    mg_origin = Origin
    origin }) }

      | Bool
    otherwise
      = do { [(UsageEnv, LocatedA (Match GhcTc (LocatedA (body GhcTc))))]
    umatches <- forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    mapM (forall a. TcM a -> TcM (UsageEnv, a)
    tcCollectingUsage forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> LMatch GhcRn (LocatedA (body GhcRn))
    -> TcM (LMatch GhcTc (LocatedA (body GhcTc)))
    tcMatch TcMatchCtxt body
    ctxt [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty) [LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    matches
           ; let ([UsageEnv]
    usages,[LocatedA (Match GhcTc (LocatedA (body GhcTc)))]
    matches') = forall a b. [(a, b)] -> ([a], [b])
    unzip [(UsageEnv, LocatedA (Match GhcTc (LocatedA (body GhcTc))))]
    umatches
           ; UsageEnv -> TcRn ()
    tcEmitBindingUsage forall a b. (a -> b) -> a -> b
    $ [UsageEnv] -> UsageEnv
    supUEs [UsageEnv]
    usages
           ; [Scaled Mult]
    pat_tys  <- forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    mapM Scaled ExpRhoType -> TcM (Scaled Mult)
    readScaledExpType [Scaled ExpRhoType]
    pat_tys
           ; Mult
    rhs_ty   <- ExpRhoType -> TcM Mult
    readExpType ExpRhoType
    rhs_ty
           ; forall (m :: * -> *) a. Monad m => a -> m a
    return (MG { mg_alts :: XRec GhcTc [LMatch GhcTc (LocatedA (body GhcTc))]
    mg_alts   = forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnL
    l [LocatedA (Match GhcTc (LocatedA (body GhcTc)))]
    matches'
                        , mg_ext :: XMG GhcTc (LocatedA (body GhcTc))
    mg_ext    = [Scaled Mult] -> Mult -> MatchGroupTc
    MatchGroupTc [Scaled Mult]
    pat_tys Mult
    rhs_ty
                        , mg_origin :: Origin
    mg_origin = Origin
    origin }) }

    -------------
    tcMatch :: (AnnoBody body) => TcMatchCtxt body
            -> [Scaled ExpSigmaType]        -- Expected pattern types
            -> ExpRhoType            -- Expected result-type of the Match.
            -> LMatch GhcRn (LocatedA (body GhcRn))
            -> TcM (LMatch GhcTc (LocatedA (body GhcTc)))

    tcMatch :: forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> LMatch GhcRn (LocatedA (body GhcRn))
    -> TcM (LMatch GhcTc (LocatedA (body GhcTc)))
    tcMatch TcMatchCtxt body
    ctxt [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty LMatch GhcRn (LocatedA (body GhcRn))
    match
      = forall a b ann.
    (a -> TcM b)
    -> GenLocated (SrcSpanAnn' ann) a
    -> TcRn (GenLocated (SrcSpanAnn' ann) b)
    wrapLocMA (TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> Match GhcRn (LocatedA (body GhcRn))
    -> TcM (Match GhcTc (LocatedA (body GhcTc)))
    tc_match TcMatchCtxt body
    ctxt [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty) LMatch GhcRn (LocatedA (body GhcRn))
    match
      where
        tc_match :: TcMatchCtxt body
    -> [Scaled ExpRhoType]
    -> ExpRhoType
    -> Match GhcRn (LocatedA (body GhcRn))
    -> TcM (Match GhcTc (LocatedA (body GhcTc)))
    tc_match TcMatchCtxt body
    ctxt [Scaled ExpRhoType]
    pat_tys ExpRhoType
    rhs_ty
                 match :: Match GhcRn (LocatedA (body GhcRn))
    match@(Match { m_pats :: forall p body. Match p body -> [LPat p]
    m_pats = [LPat GhcRn]
    pats, m_grhss :: forall p body. Match p body -> GRHSs p body
    m_grhss = GRHSs GhcRn (LocatedA (body GhcRn))
    grhss })
          = Match GhcRn (LocatedA (body GhcRn))
    -> TcM (Match GhcTc (LocatedA (body GhcTc)))
    -> TcM (Match GhcTc (LocatedA (body GhcTc)))
    add_match_ctxt Match GhcRn (LocatedA (body GhcRn))
    match forall a b. (a -> b) -> a -> b
    $
            do { ([GenLocated SrcSpanAnnA (Pat GhcTc)]
    pats', GRHSs GhcTc (LocatedA (body GhcTc))
    grhss') <- forall a.
    HsMatchContext GhcRn
    -> [LPat GhcRn]
    -> [Scaled ExpRhoType]
    -> TcM a
    -> TcM ([LPat GhcTc], a)
    tcPats (forall (body :: * -> *). TcMatchCtxt body -> HsMatchContext GhcRn
    mc_what TcMatchCtxt body
    ctxt) [LPat GhcRn]
    pats [Scaled ExpRhoType]
    pat_tys forall a b. (a -> b) -> a -> b
    $
                                    forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> GRHSs GhcRn (LocatedA (body GhcRn))
    -> ExpRhoType
    -> TcM (GRHSs GhcTc (LocatedA (body GhcTc)))
    tcGRHSs TcMatchCtxt body
    ctxt GRHSs GhcRn (LocatedA (body GhcRn))
    grhss ExpRhoType
    rhs_ty
               ; forall (m :: * -> *) a. Monad m => a -> m a
    return (Match { m_ext :: XCMatch GhcTc (LocatedA (body GhcTc))
    m_ext = forall a. EpAnn a
    noAnn
                               , m_ctxt :: HsMatchContext (NoGhcTc GhcTc)
    m_ctxt = forall (body :: * -> *). TcMatchCtxt body -> HsMatchContext GhcRn
    mc_what TcMatchCtxt body
    ctxt, m_pats :: [LPat GhcTc]
    m_pats = [GenLocated SrcSpanAnnA (Pat GhcTc)]
    pats'
                               , m_grhss :: GRHSs GhcTc (LocatedA (body GhcTc))
    m_grhss = GRHSs GhcTc (LocatedA (body GhcTc))
    grhss' }) }

            -- For (\x -> e), tcExpr has already said "In the expression \x->e"
            -- so we don't want to add "In the lambda abstraction \x->e"
        add_match_ctxt :: Match GhcRn (LocatedA (body GhcRn))
    -> TcM (Match GhcTc (LocatedA (body GhcTc)))
    -> TcM (Match GhcTc (LocatedA (body GhcTc)))
    add_match_ctxt Match GhcRn (LocatedA (body GhcRn))
    match TcM (Match GhcTc (LocatedA (body GhcTc)))
    thing_inside
            = case forall (body :: * -> *). TcMatchCtxt body -> HsMatchContext GhcRn
    mc_what TcMatchCtxt body
    ctxt of
                HsMatchContext GhcRn
    LambdaExpr -> TcM (Match GhcTc (LocatedA (body GhcTc)))
    thing_inside
                HsMatchContext GhcRn
    _          -> forall a. SDoc -> TcM a -> TcM a
    addErrCtxt (forall (idR :: Pass) body.
    (OutputableBndrId idR, Outputable body) =>
    Match (GhcPass idR) body -> SDoc
    pprMatchInCtxt Match GhcRn (LocatedA (body GhcRn))
    match) TcM (Match GhcTc (LocatedA (body GhcTc)))
    thing_inside

    -------------
    tcGRHSs :: AnnoBody body
            => TcMatchCtxt body -> GRHSs GhcRn (LocatedA (body GhcRn)) -> ExpRhoType
            -> TcM (GRHSs GhcTc (LocatedA (body GhcTc)))

    -- Notice that we pass in the full res_ty, so that we get
    -- good inference from simple things like
    --      f = \(x::forall a.a->a) -> <stuff>
    -- We used to force it to be a monotype when there was more than one guard
    -- but we don't need to do that any more

    tcGRHSs :: forall (body :: * -> *).
    AnnoBody body =>
    TcMatchCtxt body
    -> GRHSs GhcRn (LocatedA (body GhcRn))
    -> ExpRhoType
    -> TcM (GRHSs GhcTc (LocatedA (body GhcTc)))
    tcGRHSs TcMatchCtxt body
    ctxt (GRHSs XCGRHSs GhcRn (LocatedA (body GhcRn))
    _ [LGRHS GhcRn (LocatedA (body GhcRn))]
    grhss HsLocalBinds GhcRn
    binds) ExpRhoType
    res_ty
      = do  { (HsLocalBinds GhcTc
    binds', [(UsageEnv, Located (GRHS GhcTc (LocatedA (body GhcTc))))]
    ugrhss)
                <- forall thing.
    HsLocalBinds GhcRn -> TcM thing -> TcM (HsLocalBinds GhcTc, thing)
    tcLocalBinds HsLocalBinds GhcRn
    binds forall a b. (a -> b) -> a -> b
    $
                   forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    mapM (forall a. TcM a -> TcM (UsageEnv, a)
    tcCollectingUsage forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall a b. (a -> TcM b) -> Located a -> TcM (Located b)
    wrapLocM (forall (body :: * -> *).
    TcMatchCtxt body
    -> ExpRhoType
    -> GRHS GhcRn (LocatedA (body GhcRn))
    -> TcM (GRHS GhcTc (LocatedA (body GhcTc)))
    tcGRHS TcMatchCtxt body
    ctxt ExpRhoType
    res_ty)) [LGRHS GhcRn (LocatedA (body GhcRn))]
    grhss
            ; let ([UsageEnv]
    usages, [Located (GRHS GhcTc (LocatedA (body GhcTc)))]
    grhss') = forall a b. [(a, b)] -> ([a], [b])
    unzip [(UsageEnv, Located (GRHS GhcTc (LocatedA (body GhcTc))))]
    ugrhss
            ; UsageEnv -> TcRn ()
    tcEmitBindingUsage forall a b. (a -> b) -> a -> b
    $ [UsageEnv] -> UsageEnv
    supUEs [UsageEnv]
    usages
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall p body.
    XCGRHSs p body -> [LGRHS p body] -> HsLocalBinds p -> GRHSs p body
    GRHSs EpAnnComments
    emptyComments [Located (GRHS GhcTc (LocatedA (body GhcTc)))]
    grhss' HsLocalBinds GhcTc
    binds') }

    -------------
    tcGRHS :: TcMatchCtxt body -> ExpRhoType -> GRHS GhcRn (LocatedA (body GhcRn))
           -> TcM (GRHS GhcTc (LocatedA (body GhcTc)))

    tcGRHS :: forall (body :: * -> *).
    TcMatchCtxt body
    -> ExpRhoType
    -> GRHS GhcRn (LocatedA (body GhcRn))
    -> TcM (GRHS GhcTc (LocatedA (body GhcTc)))
    tcGRHS TcMatchCtxt body
    ctxt ExpRhoType
    res_ty (GRHS XCGRHS GhcRn (LocatedA (body GhcRn))
    _ [GuardLStmt GhcRn]
    guards LocatedA (body GhcRn)
    rhs)
      = do  { ([GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    guards', LocatedA (body GhcTc)
    rhs')
                <- forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    stmt_ctxt TcExprStmtChecker
    tcGuardStmt [GuardLStmt GhcRn]
    guards ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                   forall (body :: * -> *).
    TcMatchCtxt body
    -> LocatedA (body GhcRn)
    -> ExpRhoType
    -> TcM (LocatedA (body GhcTc))
    mc_body TcMatchCtxt body
    ctxt LocatedA (body GhcRn)
    rhs
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall p body.
    XCGRHS p body -> [GuardLStmt p] -> body -> GRHS p body
    GRHS forall a. EpAnn a
    noAnn [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    guards' LocatedA (body GhcTc)
    rhs') }
      where
        stmt_ctxt :: HsStmtContext GhcRn
    stmt_ctxt  = forall p. HsMatchContext p -> HsStmtContext p
    PatGuard (forall (body :: * -> *). TcMatchCtxt body -> HsMatchContext GhcRn
    mc_what TcMatchCtxt body
    ctxt)

    {-
    ************************************************************************
    *                                                                      *
    \subsection{@tcDoStmts@ typechecks a {\em list} of do statements}
    *                                                                      *
    ************************************************************************
    -}

    tcDoStmts :: HsStmtContext GhcRn
              -> LocatedL [LStmt GhcRn (LHsExpr GhcRn)]
              -> ExpRhoType
              -> TcM (HsExpr GhcTc)          -- Returns a HsDo
    tcDoStmts :: HsStmtContext GhcRn
    -> LocatedL [GuardLStmt GhcRn] -> ExpRhoType -> TcM (HsExpr GhcTc)
    tcDoStmts HsStmtContext GhcRn
    ListComp (L SrcSpanAnnL
    l [GuardLStmt GhcRn]
    stmts) ExpRhoType
    res_ty
      = do  { Mult
    res_ty <- ExpRhoType -> TcM Mult
    expTypeToType ExpRhoType
    res_ty
            ; (TcCoercionN
    co, Mult
    elt_ty) <- Mult -> TcM (TcCoercionN, Mult)
    matchExpectedListTy Mult
    res_ty
            ; let list_ty :: Mult
    list_ty = Mult -> Mult
    mkListTy Mult
    elt_ty
            ; [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts' <- forall (body :: * -> *) rho_type.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> TcM [LStmt GhcTc (LocatedA (body GhcTc))]
    tcStmts forall p. HsStmtContext p
    ListComp (TyCon -> TcExprStmtChecker
    tcLcStmt TyCon
    listTyCon) [GuardLStmt GhcRn]
    stmts
                                (Mult -> ExpRhoType
    mkCheckExpType Mult
    elt_ty)
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return forall a b. (a -> b) -> a -> b
    $ TcCoercionN -> HsExpr GhcTc -> HsExpr GhcTc
    mkHsWrapCo TcCoercionN
    co (forall p.
    XDo p
    -> HsStmtContext (HsDoRn p) -> XRec p [ExprLStmt p] -> HsExpr p
    HsDo Mult
    list_ty forall p. HsStmtContext p
    ListComp (forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnL
    l [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts')) }

    tcDoStmts doExpr :: HsStmtContext GhcRn
    doExpr@(DoExpr Maybe ModuleName
    _) (L SrcSpanAnnL
    l [GuardLStmt GhcRn]
    stmts) ExpRhoType
    res_ty
      = do  { [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts' <- forall (body :: * -> *) rho_type.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> TcM [LStmt GhcTc (LocatedA (body GhcTc))]
    tcStmts HsStmtContext GhcRn
    doExpr TcExprStmtChecker
    tcDoStmt [GuardLStmt GhcRn]
    stmts ExpRhoType
    res_ty
            ; Mult
    res_ty <- ExpRhoType -> TcM Mult
    readExpType ExpRhoType
    res_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall p.
    XDo p
    -> HsStmtContext (HsDoRn p) -> XRec p [ExprLStmt p] -> HsExpr p
    HsDo Mult
    res_ty HsStmtContext GhcRn
    doExpr (forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnL
    l [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts')) }

    tcDoStmts mDoExpr :: HsStmtContext GhcRn
    mDoExpr@(MDoExpr Maybe ModuleName
    _) (L SrcSpanAnnL
    l [GuardLStmt GhcRn]
    stmts) ExpRhoType
    res_ty
      = do  { [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts' <- forall (body :: * -> *) rho_type.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> TcM [LStmt GhcTc (LocatedA (body GhcTc))]
    tcStmts HsStmtContext GhcRn
    mDoExpr TcExprStmtChecker
    tcDoStmt [GuardLStmt GhcRn]
    stmts ExpRhoType
    res_ty
            ; Mult
    res_ty <- ExpRhoType -> TcM Mult
    readExpType ExpRhoType
    res_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall p.
    XDo p
    -> HsStmtContext (HsDoRn p) -> XRec p [ExprLStmt p] -> HsExpr p
    HsDo Mult
    res_ty HsStmtContext GhcRn
    mDoExpr (forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnL
    l [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts')) }

    tcDoStmts HsStmtContext GhcRn
    MonadComp (L SrcSpanAnnL
    l [GuardLStmt GhcRn]
    stmts) ExpRhoType
    res_ty
      = do  { [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts' <- forall (body :: * -> *) rho_type.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> TcM [LStmt GhcTc (LocatedA (body GhcTc))]
    tcStmts forall p. HsStmtContext p
    MonadComp TcExprStmtChecker
    tcMcStmt [GuardLStmt GhcRn]
    stmts ExpRhoType
    res_ty
            ; Mult
    res_ty <- ExpRhoType -> TcM Mult
    readExpType ExpRhoType
    res_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall p.
    XDo p
    -> HsStmtContext (HsDoRn p) -> XRec p [ExprLStmt p] -> HsExpr p
    HsDo Mult
    res_ty forall p. HsStmtContext p
    MonadComp (forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnL
    l [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts')) }

    tcDoStmts HsStmtContext GhcRn
    ctxt LocatedL [GuardLStmt GhcRn]
    _ ExpRhoType
    _ = forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "tcDoStmts" (forall p. (Outputable (IdP p), UnXRec p) => HsStmtContext p -> SDoc
    pprStmtContext HsStmtContext GhcRn
    ctxt)

    tcBody :: LHsExpr GhcRn -> ExpRhoType -> TcM (LHsExpr GhcTc)
    tcBody :: LHsExpr GhcRn -> ExpRhoType -> TcM (LHsExpr GhcTc)
    tcBody LHsExpr GhcRn
    body ExpRhoType
    res_ty
      = do  { String -> SDoc -> TcRn ()
    traceTc String
    "tcBody" (forall a. Outputable a => a -> SDoc
    ppr ExpRhoType
    res_ty)
            ; LHsExpr GhcRn -> ExpRhoType -> TcM (LHsExpr GhcTc)
    tcMonoExpr LHsExpr GhcRn
    body ExpRhoType
    res_ty
            }

    {-
    ************************************************************************
    *                                                                      *
    \subsection{tcStmts}
    *                                                                      *
    ************************************************************************
    -}

    type TcExprStmtChecker = TcStmtChecker HsExpr ExpRhoType
    type TcCmdStmtChecker  = TcStmtChecker HsCmd  TcRhoType

    type TcStmtChecker body rho_type
      =  forall thing. HsStmtContext GhcRn
                    -> Stmt GhcRn (LocatedA (body GhcRn))
                    -> rho_type                 -- Result type for comprehension
                    -> (rho_type -> TcM thing)  -- Checker for what follows the stmt
                    -> TcM (Stmt GhcTc (LocatedA (body GhcTc)), thing)

    tcStmts :: (AnnoBody body) => HsStmtContext GhcRn
            -> TcStmtChecker body rho_type   -- NB: higher-rank type
            -> [LStmt GhcRn (LocatedA (body GhcRn))]
            -> rho_type
            -> TcM [LStmt GhcTc (LocatedA (body GhcTc))]
    tcStmts :: forall (body :: * -> *) rho_type.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> TcM [LStmt GhcTc (LocatedA (body GhcTc))]
    tcStmts HsStmtContext GhcRn
    ctxt TcStmtChecker body rho_type
    stmt_chk [LStmt GhcRn (LocatedA (body GhcRn))]
    stmts rho_type
    res_ty
      = do { ([GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts', ()
    _) <- forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcStmtChecker body rho_type
    stmt_chk [LStmt GhcRn (LocatedA (body GhcRn))]
    stmts rho_type
    res_ty forall a b. (a -> b) -> a -> b
    $
                            forall a b. a -> b -> a
    const (forall (m :: * -> *) a. Monad m => a -> m a
    return ())
           ; forall (m :: * -> *) a. Monad m => a -> m a
    return [GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts' }

    tcStmtsAndThen :: (AnnoBody body) => HsStmtContext GhcRn
                   -> TcStmtChecker body rho_type    -- NB: higher-rank type
                   -> [LStmt GhcRn (LocatedA (body GhcRn))]
                   -> rho_type
                   -> (rho_type -> TcM thing)
                   -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)

    -- Note the higher-rank type.  stmt_chk is applied at different
    -- types in the equations for tcStmts

    tcStmtsAndThen :: forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    _ TcStmtChecker body rho_type
    _ [] rho_type
    res_ty rho_type -> TcM thing
    thing_inside
      = do  { thing
    thing <- rho_type -> TcM thing
    thing_inside rho_type
    res_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return ([], thing
    thing) }

    -- LetStmts are handled uniformly, regardless of context
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcStmtChecker body rho_type
    stmt_chk (L SrcSpanAnnA
    loc (LetStmt XLetStmt GhcRn GhcRn (LocatedA (body GhcRn))
    x HsLocalBinds GhcRn
    binds) : [LStmt GhcRn (LocatedA (body GhcRn))]
    stmts)
                                                                 rho_type
    res_ty rho_type -> TcM thing
    thing_inside
      = do  { (HsLocalBinds GhcTc
    binds', ([GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts',thing
    thing)) <- forall thing.
    HsLocalBinds GhcRn -> TcM thing -> TcM (HsLocalBinds GhcTc, thing)
    tcLocalBinds HsLocalBinds GhcRn
    binds forall a b. (a -> b) -> a -> b
    $
                  forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcStmtChecker body rho_type
    stmt_chk [LStmt GhcRn (LocatedA (body GhcRn))]
    stmts rho_type
    res_ty rho_type -> TcM thing
    thing_inside
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc (forall idL idR body.
    XLetStmt idL idR body
    -> HsLocalBindsLR idL idR -> StmtLR idL idR body
    LetStmt XLetStmt GhcRn GhcRn (LocatedA (body GhcRn))
    x HsLocalBinds GhcTc
    binds') forall a. a -> [a] -> [a]
    : [GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts', thing
    thing) }

    -- Don't set the error context for an ApplicativeStmt.  It ought to be
    -- possible to do this with a popErrCtxt in the tcStmt case for
    -- ApplicativeStmt, but it did something strange and broke a test (ado002).
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcStmtChecker body rho_type
    stmt_chk (L SrcSpanAnnA
    loc StmtLR GhcRn GhcRn (LocatedA (body GhcRn))
    stmt : [LStmt GhcRn (LocatedA (body GhcRn))]
    stmts) rho_type
    res_ty rho_type -> TcM thing
    thing_inside
      | ApplicativeStmt{} <- StmtLR GhcRn GhcRn (LocatedA (body GhcRn))
    stmt
      = do  { (StmtLR GhcTc GhcTc (LocatedA (body GhcTc))
    stmt', ([GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts', thing
    thing)) <-
                 TcStmtChecker body rho_type
    stmt_chk HsStmtContext GhcRn
    ctxt StmtLR GhcRn GhcRn (LocatedA (body GhcRn))
    stmt rho_type
    res_ty forall a b. (a -> b) -> a -> b
    $ \ rho_type
    res_ty' ->
                   forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcStmtChecker body rho_type
    stmt_chk [LStmt GhcRn (LocatedA (body GhcRn))]
    stmts rho_type
    res_ty'  forall a b. (a -> b) -> a -> b
    $
                     rho_type -> TcM thing
    thing_inside
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc StmtLR GhcTc GhcTc (LocatedA (body GhcTc))
    stmt' forall a. a -> [a] -> [a]
    : [GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts', thing
    thing) }

      -- For the vanilla case, handle the location-setting part
      | Bool
    otherwise
      = do  { (StmtLR GhcTc GhcTc (LocatedA (body GhcTc))
    stmt', ([GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts', thing
    thing)) <-
                    forall ann a. SrcSpanAnn' ann -> TcRn a -> TcRn a
    setSrcSpanA SrcSpanAnnA
    loc                             forall a b. (a -> b) -> a -> b
    $
                    forall a. SDoc -> TcM a -> TcM a
    addErrCtxt (forall (idL :: Pass) (idR :: Pass) body.
    (OutputableBndrId idL, OutputableBndrId idR, Outputable body,
     Anno (StmtLR (GhcPass idL) (GhcPass idR) body) ~ SrcSpanAnnA) =>
    HsStmtContext (GhcPass idL)
    -> StmtLR (GhcPass idL) (GhcPass idR) body -> SDoc
    pprStmtInCtxt HsStmtContext GhcRn
    ctxt StmtLR GhcRn GhcRn (LocatedA (body GhcRn))
    stmt)        forall a b. (a -> b) -> a -> b
    $
                    TcStmtChecker body rho_type
    stmt_chk HsStmtContext GhcRn
    ctxt StmtLR GhcRn GhcRn (LocatedA (body GhcRn))
    stmt rho_type
    res_ty                   forall a b. (a -> b) -> a -> b
    $ \ rho_type
    res_ty' ->
                    forall a. TcM a -> TcM a
    popErrCtxt                                  forall a b. (a -> b) -> a -> b
    $
                    forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcStmtChecker body rho_type
    stmt_chk [LStmt GhcRn (LocatedA (body GhcRn))]
    stmts rho_type
    res_ty'  forall a b. (a -> b) -> a -> b
    $
                    rho_type -> TcM thing
    thing_inside
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnA
    loc StmtLR GhcTc GhcTc (LocatedA (body GhcTc))
    stmt' forall a. a -> [a] -> [a]
    : [GenLocated
       SrcSpanAnnA (StmtLR GhcTc GhcTc (LocatedA (body GhcTc)))]
    stmts', thing
    thing) }

    ---------------------------------------------------
    --              Pattern guards
    ---------------------------------------------------

    tcGuardStmt :: TcExprStmtChecker
    tcGuardStmt :: TcExprStmtChecker
    tcGuardStmt HsStmtContext GhcRn
    _ (BodyStmt XBodyStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ LocatedA (HsExpr GhcRn)
    guard SyntaxExpr GhcRn
    _ SyntaxExpr GhcRn
    _) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { LocatedA (HsExpr GhcTc)
    guard' <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    Many forall a b. (a -> b) -> a -> b
    $ LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExpr LocatedA (HsExpr GhcRn)
    guard Mult
    boolTy
              -- Scale the guard to Many (see #19120 and #19193)
            ; thing
    thing  <- ExpRhoType -> TcM thing
    thing_inside ExpRhoType
    res_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XBodyStmt idL idR body
    -> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
    BodyStmt Mult
    boolTy LocatedA (HsExpr GhcTc)
    guard' forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr, thing
    thing) }

    tcGuardStmt HsStmtContext GhcRn
    ctxt (BindStmt XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ LPat GhcRn
    pat LocatedA (HsExpr GhcRn)
    rhs) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { -- The Many on the next line and the unrestricted on the line after
              -- are linked. These must be the same multiplicity. Consider
              --   x <- rhs -> u
              --
              -- The multiplicity of x in u must be the same as the multiplicity at
              -- which the rhs has been consumed. When solving #18738, we want these
              -- two multiplicity to still be the same.
              (LocatedA (HsExpr GhcTc)
    rhs', Mult
    rhs_ty) <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    Many forall a b. (a -> b) -> a -> b
    $ LHsExpr GhcRn -> TcM (LHsExpr GhcTc, Mult)
    tcInferRhoNC LocatedA (HsExpr GhcRn)
    rhs
                                       -- Stmt has a context already
            ; (GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', thing
    thing)  <- forall a.
    HsMatchContext GhcRn
    -> CtOrigin
    -> LPat GhcRn
    -> Scaled Mult
    -> TcM a
    -> TcM (LPat GhcTc, a)
    tcCheckPat_O (forall p. HsStmtContext p -> HsMatchContext p
    StmtCtxt HsStmtContext GhcRn
    ctxt) (LHsExpr GhcRn -> CtOrigin
    lexprCtOrigin LocatedA (HsExpr GhcRn)
    rhs)
                                             LPat GhcRn
    pat (forall a. a -> Scaled a
    unrestricted Mult
    rhs_ty) forall a b. (a -> b) -> a -> b
    $
                                ExpRhoType -> TcM thing
    thing_inside ExpRhoType
    res_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall (bodyR :: * -> *).
    LPat GhcTc
    -> LocatedA (bodyR GhcTc)
    -> StmtLR GhcTc GhcTc (LocatedA (bodyR GhcTc))
    mkTcBindStmt GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' LocatedA (HsExpr GhcTc)
    rhs', thing
    thing) }

    tcGuardStmt HsStmtContext GhcRn
    _ Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt ExpRhoType
    _ ExpRhoType -> TcM thing
    _
      = forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "tcGuardStmt: unexpected Stmt" (forall a. Outputable a => a -> SDoc
    ppr Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt)

    ---------------------------------------------------
    --           List comprehensions
    --               (no rebindable syntax)
    ---------------------------------------------------

    -- Dealt with separately, rather than by tcMcStmt, because
    --   a) We have special desugaring rules for list comprehensions,
    --      which avoid creating intermediate lists.  They in turn
    --      assume that the bind/return operations are the regular
    --      polymorphic ones, and in particular don't have any
    --      coercion matching stuff in them.  It's hard to avoid the
    --      potential for non-trivial coercions in tcMcStmt

    tcLcStmt :: TyCon       -- The list type constructor ([])
             -> TcExprStmtChecker

    tcLcStmt :: TyCon -> TcExprStmtChecker
    tcLcStmt TyCon
    _ HsStmtContext GhcRn
    _ (LastStmt XLastStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    x LocatedA (HsExpr GhcRn)
    body Maybe Bool
    noret SyntaxExpr GhcRn
    _) ExpRhoType
    elt_ty ExpRhoType -> TcM thing
    thing_inside
      = do { LocatedA (HsExpr GhcTc)
    body' <- LHsExpr GhcRn -> ExpRhoType -> TcM (LHsExpr GhcTc)
    tcMonoExprNC LocatedA (HsExpr GhcRn)
    body ExpRhoType
    elt_ty
           ; thing
    thing <- ExpRhoType -> TcM thing
    thing_inside (forall a. String -> a
    panic String
    "tcLcStmt: thing_inside")
           ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XLastStmt idL idR body
    -> body -> Maybe Bool -> SyntaxExpr idR -> StmtLR idL idR body
    LastStmt XLastStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    x LocatedA (HsExpr GhcTc)
    body' Maybe Bool
    noret forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr, thing
    thing) }

    -- A generator, pat <- rhs
    tcLcStmt TyCon
    m_tc HsStmtContext GhcRn
    ctxt (BindStmt XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ LPat GhcRn
    pat LocatedA (HsExpr GhcRn)
    rhs) ExpRhoType
    elt_ty ExpRhoType -> TcM thing
    thing_inside
     = do   { Mult
    pat_ty <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind
            ; LocatedA (HsExpr GhcTc)
    rhs'   <- LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExpr LocatedA (HsExpr GhcRn)
    rhs (TyCon -> [Mult] -> Mult
    mkTyConApp TyCon
    m_tc [Mult
    pat_ty])
            ; (GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', thing
    thing)  <- forall a.
    HsMatchContext GhcRn
    -> LPat GhcRn -> Scaled Mult -> TcM a -> TcM (LPat GhcTc, a)
    tcCheckPat (forall p. HsStmtContext p -> HsMatchContext p
    StmtCtxt HsStmtContext GhcRn
    ctxt) LPat GhcRn
    pat (forall a. a -> Scaled a
    unrestricted Mult
    pat_ty) forall a b. (a -> b) -> a -> b
    $
                                ExpRhoType -> TcM thing
    thing_inside ExpRhoType
    elt_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall (bodyR :: * -> *).
    LPat GhcTc
    -> LocatedA (bodyR GhcTc)
    -> StmtLR GhcTc GhcTc (LocatedA (bodyR GhcTc))
    mkTcBindStmt GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' LocatedA (HsExpr GhcTc)
    rhs', thing
    thing) }

    -- A boolean guard
    tcLcStmt TyCon
    _ HsStmtContext GhcRn
    _ (BodyStmt XBodyStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ LocatedA (HsExpr GhcRn)
    rhs SyntaxExpr GhcRn
    _ SyntaxExpr GhcRn
    _) ExpRhoType
    elt_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { LocatedA (HsExpr GhcTc)
    rhs'  <- LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExpr LocatedA (HsExpr GhcRn)
    rhs Mult
    boolTy
            ; thing
    thing <- ExpRhoType -> TcM thing
    thing_inside ExpRhoType
    elt_ty
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XBodyStmt idL idR body
    -> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
    BodyStmt Mult
    boolTy LocatedA (HsExpr GhcTc)
    rhs' forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr, thing
    thing) }

    -- ParStmt: See notes with tcMcStmt
    tcLcStmt TyCon
    m_tc HsStmtContext GhcRn
    ctxt (ParStmt XParStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ [ParStmtBlock GhcRn GhcRn]
    bndr_stmts_s HsExpr GhcRn
    _ SyntaxExpr GhcRn
    _) ExpRhoType
    elt_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { ([ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing) <- [ParStmtBlock GhcRn GhcRn]
    -> IOEnv
         (Env TcGblEnv TcLclEnv) ([ParStmtBlock GhcTc GhcTc], thing)
    loop [ParStmtBlock GhcRn GhcRn]
    bndr_stmts_s
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XParStmt idL idR body
    -> [ParStmtBlock idL idR]
    -> HsExpr idR
    -> SyntaxExpr idR
    -> StmtLR idL idR body
    ParStmt Mult
    unitTy [ParStmtBlock GhcTc GhcTc]
    pairs' forall (p :: Pass). HsExpr (GhcPass p)
    noExpr forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr, thing
    thing) }
      where
        -- loop :: [([LStmt GhcRn], [GhcRn])]
        --      -> TcM ([([LStmt GhcTc], [GhcTc])], thing)
        loop :: [ParStmtBlock GhcRn GhcRn]
    -> IOEnv
         (Env TcGblEnv TcLclEnv) ([ParStmtBlock GhcTc GhcTc], thing)
    loop [] = do { thing
    thing <- ExpRhoType -> TcM thing
    thing_inside ExpRhoType
    elt_ty
                     ; forall (m :: * -> *) a. Monad m => a -> m a
    return ([], thing
    thing) }         -- matching in the branches

        loop (ParStmtBlock XParStmtBlock GhcRn GhcRn
    x [GuardLStmt GhcRn]
    stmts [IdP GhcRn]
    names SyntaxExpr GhcRn
    _ : [ParStmtBlock GhcRn GhcRn]
    pairs)
          = do { ([GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', ([Id]
    ids, [ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing))
                    <- forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt (TyCon -> TcExprStmtChecker
    tcLcStmt TyCon
    m_tc) [GuardLStmt GhcRn]
    stmts ExpRhoType
    elt_ty forall a b. (a -> b) -> a -> b
    $ \ ExpRhoType
    _elt_ty' ->
                       do { [Id]
    ids <- [Name] -> TcM [Id]
    tcLookupLocalIds [IdP GhcRn]
    names
                          ; ([ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing) <- [ParStmtBlock GhcRn GhcRn]
    -> IOEnv
         (Env TcGblEnv TcLclEnv) ([ParStmtBlock GhcTc GhcTc], thing)
    loop [ParStmtBlock GhcRn GhcRn]
    pairs
                          ; forall (m :: * -> *) a. Monad m => a -> m a
    return ([Id]
    ids, [ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing) }
               ; forall (m :: * -> *) a. Monad m => a -> m a
    return ( forall idL idR.
    XParStmtBlock idL idR
    -> [ExprLStmt idL]
    -> [IdP idR]
    -> SyntaxExpr idR
    -> ParStmtBlock idL idR
    ParStmtBlock XParStmtBlock GhcRn GhcRn
    x [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts' [Id]
    ids forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr forall a. a -> [a] -> [a]
    : [ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing ) }

    tcLcStmt TyCon
    m_tc HsStmtContext GhcRn
    ctxt (TransStmt { trS_form :: forall idL idR body. StmtLR idL idR body -> TransForm
    trS_form = TransForm
    form, trS_stmts :: forall idL idR body. StmtLR idL idR body -> [ExprLStmt idL]
    trS_stmts = [GuardLStmt GhcRn]
    stmts
                                  , trS_bndrs :: forall idL idR body. StmtLR idL idR body -> [(IdP idR, IdP idR)]
    trS_bndrs =  [(IdP GhcRn, IdP GhcRn)]
    bindersMap
                                  , trS_by :: forall idL idR body. StmtLR idL idR body -> Maybe (LHsExpr idR)
    trS_by = Maybe (LHsExpr GhcRn)
    by, trS_using :: forall idL idR body. StmtLR idL idR body -> LHsExpr idR
    trS_using = LHsExpr GhcRn
    using }) ExpRhoType
    elt_ty ExpRhoType -> TcM thing
    thing_inside
      = do { let ([Name]
    bndr_names, [Name]
    n_bndr_names) = forall a b. [(a, b)] -> ([a], [b])
    unzip [(IdP GhcRn, IdP GhcRn)]
    bindersMap
                 unused_ty :: ExpRhoType
    unused_ty = forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "tcLcStmt: inner ty" (forall a. Outputable a => a -> SDoc
    ppr [(IdP GhcRn, IdP GhcRn)]
    bindersMap)
                 -- The inner 'stmts' lack a LastStmt, so the element type
                 --  passed in to tcStmtsAndThen is never looked at
           ; ([GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', ([Id]
    bndr_ids, Maybe (LocatedA (HsExpr GhcTc), Mult)
    by'))
                <- forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen (forall p. HsStmtContext p -> HsStmtContext p
    TransStmtCtxt HsStmtContext GhcRn
    ctxt) (TyCon -> TcExprStmtChecker
    tcLcStmt TyCon
    m_tc) [GuardLStmt GhcRn]
    stmts ExpRhoType
    unused_ty forall a b. (a -> b) -> a -> b
    $ \ExpRhoType
    _ -> do
                   { Maybe (LocatedA (HsExpr GhcTc), Mult)
    by' <- forall (t :: * -> *) (f :: * -> *) a b.
    (Traversable t, Applicative f) =>
    (a -> f b) -> t a -> f (t b)
    traverse LHsExpr GhcRn -> TcM (LHsExpr GhcTc, Mult)
    tcInferRho Maybe (LHsExpr GhcRn)
    by
                   ; [Id]
    bndr_ids <- [Name] -> TcM [Id]
    tcLookupLocalIds [Name]
    bndr_names
                   ; forall (m :: * -> *) a. Monad m => a -> m a
    return ([Id]
    bndr_ids, Maybe (LocatedA (HsExpr GhcTc), Mult)
    by') }

           ; let m_app :: Mult -> Mult
    m_app Mult
    ty = TyCon -> [Mult] -> Mult
    mkTyConApp TyCon
    m_tc [Mult
    ty]

           --------------- Typecheck the 'using' function -------------
           -- using :: ((a,b,c)->t) -> m (a,b,c) -> m (a,b,c)m      (ThenForm)
           --       :: ((a,b,c)->t) -> m (a,b,c) -> m (m (a,b,c)))  (GroupForm)

             -- n_app :: Type -> Type   -- Wraps a 'ty' into '[ty]' for GroupForm
           ; let n_app :: Mult -> Mult
    n_app = case TransForm
    form of
                           TransForm
    ThenForm -> (\Mult
    ty -> Mult
    ty)
                           TransForm
    _        -> Mult -> Mult
    m_app

                 by_arrow :: Type -> Type     -- Wraps 'ty' to '(a->t) -> ty' if the By is present
                 by_arrow :: Mult -> Mult
    by_arrow = case Maybe (LocatedA (HsExpr GhcTc), Mult)
    by' of
                              Maybe (LocatedA (HsExpr GhcTc), Mult)
    Nothing       -> \Mult
    ty -> Mult
    ty
                              Just (LocatedA (HsExpr GhcTc)
    _,Mult
    e_ty) -> \Mult
    ty -> (Mult
    alphaTy Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    e_ty) Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    ty

                 tup_ty :: Mult
    tup_ty        = [Id] -> Mult
    mkBigCoreVarTupTy [Id]
    bndr_ids
                 poly_arg_ty :: Mult
    poly_arg_ty   = Mult -> Mult
    m_app Mult
    alphaTy
                 poly_res_ty :: Mult
    poly_res_ty   = Mult -> Mult
    m_app (Mult -> Mult
    n_app Mult
    alphaTy)
                 using_poly_ty :: Mult
    using_poly_ty = Id -> Mult -> Mult
    mkInfForAllTy Id
    alphaTyVar forall a b. (a -> b) -> a -> b
    $
                                 Mult -> Mult
    by_arrow forall a b. (a -> b) -> a -> b
    $
                                 Mult
    poly_arg_ty Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    poly_res_ty

           ; LocatedA (HsExpr GhcTc)
    using' <- LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckPolyExpr LHsExpr GhcRn
    using Mult
    using_poly_ty
           ; let final_using :: LocatedA (HsExpr GhcTc)
    final_using = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap (HsWrapper -> HsExpr GhcTc -> HsExpr GhcTc
    mkHsWrap (Mult -> HsWrapper
    WpTyApp Mult
    tup_ty)) LocatedA (HsExpr GhcTc)
    using'

                 -- 'stmts' returns a result of type (m1_ty tuple_ty),
                 -- typically something like [(Int,Bool,Int)]
                 -- We don't know what tuple_ty is yet, so we use a variable
           ; let mk_n_bndr :: Name -> TcId -> TcId
                 mk_n_bndr :: Name -> Id -> Id
    mk_n_bndr Name
    n_bndr_name Id
    bndr_id = HasDebugCallStack => Name -> Mult -> Mult -> Id
    mkLocalId Name
    n_bndr_name Mult
    Many (Mult -> Mult
    n_app (Id -> Mult
    idType Id
    bndr_id))

                 -- Ensure that every old binder of type `b` is linked up with its
                 -- new binder which should have type `n b`
                 -- See Note [GroupStmt binder map] in GHC.Hs.Expr
                 n_bndr_ids :: [Id]
    n_bndr_ids  = forall a b c. (a -> b -> c) -> [a] -> [b] -> [c]
    zipWith Name -> Id -> Id
    mk_n_bndr [Name]
    n_bndr_names [Id]
    bndr_ids
                 bindersMap' :: [(Id, Id)]
    bindersMap' = [Id]
    bndr_ids forall a b. [a] -> [b] -> [(a, b)]
    `zip` [Id]
    n_bndr_ids

           -- Type check the thing in the environment with
           -- these new binders and return the result
           ; thing
    thing <- forall a. [Id] -> TcM a -> TcM a
    tcExtendIdEnv [Id]
    n_bndr_ids (ExpRhoType -> TcM thing
    thing_inside ExpRhoType
    elt_ty)

           ; forall (m :: * -> *) a. Monad m => a -> m a
    return (TransStmt { trS_stmts :: [ExprLStmt GhcTc]
    trS_stmts = [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', trS_bndrs :: [(IdP GhcTc, IdP GhcTc)]
    trS_bndrs = [(Id, Id)]
    bindersMap'
                               , trS_by :: Maybe (LHsExpr GhcTc)
    trS_by = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap forall a b. (a, b) -> a
    fst Maybe (LocatedA (HsExpr GhcTc), Mult)
    by', trS_using :: LHsExpr GhcTc
    trS_using = LocatedA (HsExpr GhcTc)
    final_using
                               , trS_ret :: SyntaxExpr GhcTc
    trS_ret = forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr
                               , trS_bind :: SyntaxExpr GhcTc
    trS_bind = forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr
                               , trS_fmap :: HsExpr GhcTc
    trS_fmap = forall (p :: Pass). HsExpr (GhcPass p)
    noExpr
                               , trS_ext :: XTransStmt GhcTc GhcTc (LocatedA (HsExpr GhcTc))
    trS_ext = Mult
    unitTy
                               , trS_form :: TransForm
    trS_form = TransForm
    form }, thing
    thing) }

    tcLcStmt TyCon
    _ HsStmtContext GhcRn
    _ Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt ExpRhoType
    _ ExpRhoType -> TcM thing
    _
      = forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "tcLcStmt: unexpected Stmt" (forall a. Outputable a => a -> SDoc
    ppr Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt)

    ---------------------------------------------------
    --           Monad comprehensions
    --        (supports rebindable syntax)
    ---------------------------------------------------

    tcMcStmt :: TcExprStmtChecker

    tcMcStmt :: TcExprStmtChecker
    tcMcStmt HsStmtContext GhcRn
    _ (LastStmt XLastStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    x LocatedA (HsExpr GhcRn)
    body Maybe Bool
    noret SyntaxExpr GhcRn
    return_op) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { (LocatedA (HsExpr GhcTc)
    body', SyntaxExprTc
    return_op')
                <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin SyntaxExpr GhcRn
    return_op [SyntaxOpType
    SynRho] ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                   \ [Mult
    a_ty] [Mult
    mult]->
                   forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    mult forall a b. (a -> b) -> a -> b
    $ LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExprNC LocatedA (HsExpr GhcRn)
    body Mult
    a_ty
            ; thing
    thing      <- ExpRhoType -> TcM thing
    thing_inside (forall a. String -> a
    panic String
    "tcMcStmt: thing_inside")
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XLastStmt idL idR body
    -> body -> Maybe Bool -> SyntaxExpr idR -> StmtLR idL idR body
    LastStmt XLastStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    x LocatedA (HsExpr GhcTc)
    body' Maybe Bool
    noret SyntaxExprTc
    return_op', thing
    thing) }

    -- Generators for monad comprehensions ( pat <- rhs )
    --
    --   [ body | q <- gen ]  ->  gen :: m a
    --                            q   ::   a
    --

    tcMcStmt HsStmtContext GhcRn
    ctxt (BindStmt XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    xbsrn LPat GhcRn
    pat LocatedA (HsExpr GhcRn)
    rhs) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
               -- (>>=) :: rhs_ty -> (pat_ty -> new_res_ty) -> res_ty
      = do  { ((LocatedA (HsExpr GhcTc)
    rhs', Mult
    pat_mult, GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', thing
    thing, Mult
    new_res_ty), SyntaxExprTc
    bind_op')
                <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin (XBindStmtRn -> SyntaxExpr GhcRn
    xbsrn_bindOp XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    xbsrn)
                              [SyntaxOpType
    SynRho, SyntaxOpType -> SyntaxOpType -> SyntaxOpType
    SynFun SyntaxOpType
    SynAny SyntaxOpType
    SynRho] ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                   \ [Mult
    rhs_ty, Mult
    pat_ty, Mult
    new_res_ty] [Mult
    rhs_mult, Mult
    fun_mult, Mult
    pat_mult] ->
                   do { LocatedA (HsExpr GhcTc)
    rhs' <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    rhs_mult forall a b. (a -> b) -> a -> b
    $ LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExprNC LocatedA (HsExpr GhcRn)
    rhs Mult
    rhs_ty
                      ; (GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', thing
    thing) <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    fun_mult forall a b. (a -> b) -> a -> b
    $ forall a.
    HsMatchContext GhcRn
    -> LPat GhcRn -> Scaled Mult -> TcM a -> TcM (LPat GhcTc, a)
    tcCheckPat (forall p. HsStmtContext p -> HsMatchContext p
    StmtCtxt HsStmtContext GhcRn
    ctxt) LPat GhcRn
    pat (forall a. Mult -> a -> Scaled a
    Scaled Mult
    pat_mult Mult
    pat_ty) forall a b. (a -> b) -> a -> b
    $
                                         ExpRhoType -> TcM thing
    thing_inside (Mult -> ExpRhoType
    mkCheckExpType Mult
    new_res_ty)
                      ; forall (m :: * -> *) a. Monad m => a -> m a
    return (LocatedA (HsExpr GhcTc)
    rhs', Mult
    pat_mult, GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', thing
    thing, Mult
    new_res_ty) }

            -- If (but only if) the pattern can fail, typecheck the 'fail' operator
            ; Maybe SyntaxExprTc
    fail_op' <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap forall (m :: * -> *) a. Monad m => m (m a) -> m a
    join forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    t a -> (a -> m b) -> m (t b)
    forM (XBindStmtRn -> FailOperator GhcRn
    xbsrn_failOp XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    xbsrn) forall a b. (a -> b) -> a -> b
    $ \SyntaxExprRn
    fail ->
                CtOrigin
    -> LPat GhcTc
    -> SyntaxExpr GhcRn
    -> Mult
    -> TcRn (FailOperator GhcTc)
    tcMonadFailOp (LPat GhcRn -> CtOrigin
    MCompPatOrigin LPat GhcRn
    pat) GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' SyntaxExprRn
    fail Mult
    new_res_ty

            ; let xbstc :: XBindStmtTc
    xbstc = XBindStmtTc
                    { xbstc_bindOp :: SyntaxExpr GhcTc
    xbstc_bindOp = SyntaxExprTc
    bind_op'
                    , xbstc_boundResultType :: Mult
    xbstc_boundResultType = Mult
    new_res_ty
                    , xbstc_boundResultMult :: Mult
    xbstc_boundResultMult = Mult
    pat_mult
                    , xbstc_failOp :: FailOperator GhcTc
    xbstc_failOp = Maybe SyntaxExprTc
    fail_op'
                    }
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XBindStmt idL idR body -> LPat idL -> body -> StmtLR idL idR body
    BindStmt XBindStmtTc
    xbstc GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' LocatedA (HsExpr GhcTc)
    rhs', thing
    thing) }

    -- Boolean expressions.
    --
    --   [ body | stmts, expr ]  ->  expr :: m Bool
    --
    tcMcStmt HsStmtContext GhcRn
    _ (BodyStmt XBodyStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ LocatedA (HsExpr GhcRn)
    rhs SyntaxExpr GhcRn
    then_op SyntaxExpr GhcRn
    guard_op) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { -- Deal with rebindable syntax:
              --    guard_op :: test_ty -> rhs_ty
              --    then_op  :: rhs_ty -> new_res_ty -> res_ty
              -- Where test_ty is, for example, Bool
            ; ((thing
    thing, LocatedA (HsExpr GhcTc)
    rhs', Mult
    rhs_ty, SyntaxExprTc
    guard_op'), SyntaxExprTc
    then_op')
                <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin SyntaxExpr GhcRn
    then_op [SyntaxOpType
    SynRho, SyntaxOpType
    SynRho] ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                   \ [Mult
    rhs_ty, Mult
    new_res_ty] [Mult
    rhs_mult, Mult
    fun_mult] ->
                   do { (LocatedA (HsExpr GhcTc)
    rhs', SyntaxExprTc
    guard_op')
                          <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    rhs_mult forall a b. (a -> b) -> a -> b
    $
                             forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin SyntaxExpr GhcRn
    guard_op [SyntaxOpType
    SynAny]
                                        (Mult -> ExpRhoType
    mkCheckExpType Mult
    rhs_ty) forall a b. (a -> b) -> a -> b
    $
                             \ [Mult
    test_ty] [Mult
    test_mult] ->
                             forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    test_mult forall a b. (a -> b) -> a -> b
    $ LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExpr LocatedA (HsExpr GhcRn)
    rhs Mult
    test_ty
                      ; thing
    thing <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    fun_mult forall a b. (a -> b) -> a -> b
    $ ExpRhoType -> TcM thing
    thing_inside (Mult -> ExpRhoType
    mkCheckExpType Mult
    new_res_ty)
                      ; forall (m :: * -> *) a. Monad m => a -> m a
    return (thing
    thing, LocatedA (HsExpr GhcTc)
    rhs', Mult
    rhs_ty, SyntaxExprTc
    guard_op') }
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XBodyStmt idL idR body
    -> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
    BodyStmt Mult
    rhs_ty LocatedA (HsExpr GhcTc)
    rhs' SyntaxExprTc
    then_op' SyntaxExprTc
    guard_op', thing
    thing) }

    -- Grouping statements
    --
    --   [ body | stmts, then group by e using f ]
    --     ->  e :: t
    --         f :: forall a. (a -> t) -> m a -> m (m a)
    --   [ body | stmts, then group using f ]
    --     ->  f :: forall a. m a -> m (m a)

    -- We type [ body | (stmts, group by e using f), ... ]
    --     f <optional by> [ (a,b,c) | stmts ] >>= \(a,b,c) -> ...body....
    --
    -- We type the functions as follows:
    --     f <optional by> :: m1 (a,b,c) -> m2 (a,b,c)              (ThenForm)
    --                     :: m1 (a,b,c) -> m2 (n (a,b,c))          (GroupForm)
    --     (>>=) :: m2 (a,b,c)     -> ((a,b,c)   -> res) -> res     (ThenForm)
    --           :: m2 (n (a,b,c)) -> (n (a,b,c) -> res) -> res     (GroupForm)
    --
    tcMcStmt HsStmtContext GhcRn
    ctxt (TransStmt { trS_stmts :: forall idL idR body. StmtLR idL idR body -> [ExprLStmt idL]
    trS_stmts = [GuardLStmt GhcRn]
    stmts, trS_bndrs :: forall idL idR body. StmtLR idL idR body -> [(IdP idR, IdP idR)]
    trS_bndrs = [(IdP GhcRn, IdP GhcRn)]
    bindersMap
                             , trS_by :: forall idL idR body. StmtLR idL idR body -> Maybe (LHsExpr idR)
    trS_by = Maybe (LHsExpr GhcRn)
    by, trS_using :: forall idL idR body. StmtLR idL idR body -> LHsExpr idR
    trS_using = LHsExpr GhcRn
    using, trS_form :: forall idL idR body. StmtLR idL idR body -> TransForm
    trS_form = TransForm
    form
                             , trS_ret :: forall idL idR body. StmtLR idL idR body -> SyntaxExpr idR
    trS_ret = SyntaxExpr GhcRn
    return_op, trS_bind :: forall idL idR body. StmtLR idL idR body -> SyntaxExpr idR
    trS_bind = SyntaxExpr GhcRn
    bind_op
                             , trS_fmap :: forall idL idR body. StmtLR idL idR body -> HsExpr idR
    trS_fmap = HsExpr GhcRn
    fmap_op }) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do { Mult
    m1_ty   <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    typeToTypeKind
           ; Mult
    m2_ty   <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    typeToTypeKind
           ; Mult
    tup_ty  <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind
           ; Mult
    by_e_ty <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind  -- The type of the 'by' expression (if any)

             -- n_app :: Type -> Type   -- Wraps a 'ty' into '(n ty)' for GroupForm
           ; Mult -> Mult
    n_app <- case TransForm
    form of
                        TransForm
    ThenForm -> forall (m :: * -> *) a. Monad m => a -> m a
    return (\Mult
    ty -> Mult
    ty)
                        TransForm
    _        -> do { Mult
    n_ty <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    typeToTypeKind
                                       ; forall (m :: * -> *) a. Monad m => a -> m a
    return (Mult
    n_ty Mult -> Mult -> Mult
    `mkAppTy`) }
           ; let by_arrow :: Type -> Type
                 -- (by_arrow res) produces ((alpha->e_ty) -> res)     ('by' present)
                 --                          or res                    ('by' absent)
                 by_arrow :: Mult -> Mult
    by_arrow = case Maybe (LHsExpr GhcRn)
    by of
                              Maybe (LHsExpr GhcRn)
    Nothing -> \Mult
    res -> Mult
    res
                              Just {} -> \Mult
    res -> (Mult
    alphaTy Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    by_e_ty) Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    res

                 poly_arg_ty :: Mult
    poly_arg_ty  = Mult
    m1_ty Mult -> Mult -> Mult
    `mkAppTy` Mult
    alphaTy
                 using_arg_ty :: Mult
    using_arg_ty = Mult
    m1_ty Mult -> Mult -> Mult
    `mkAppTy` Mult
    tup_ty
                 poly_res_ty :: Mult
    poly_res_ty  = Mult
    m2_ty Mult -> Mult -> Mult
    `mkAppTy` Mult -> Mult
    n_app Mult
    alphaTy
                 using_res_ty :: Mult
    using_res_ty = Mult
    m2_ty Mult -> Mult -> Mult
    `mkAppTy` Mult -> Mult
    n_app Mult
    tup_ty
                 using_poly_ty :: Mult
    using_poly_ty = Id -> Mult -> Mult
    mkInfForAllTy Id
    alphaTyVar forall a b. (a -> b) -> a -> b
    $
                                 Mult -> Mult
    by_arrow forall a b. (a -> b) -> a -> b
    $
                                 Mult
    poly_arg_ty Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    poly_res_ty

                 -- 'stmts' returns a result of type (m1_ty tuple_ty),
                 -- typically something like [(Int,Bool,Int)]
                 -- We don't know what tuple_ty is yet, so we use a variable
           ; let ([Name]
    bndr_names, [Name]
    n_bndr_names) = forall a b. [(a, b)] -> ([a], [b])
    unzip [(IdP GhcRn, IdP GhcRn)]
    bindersMap
           ; ([GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', ([Id]
    bndr_ids, Maybe (LocatedA (HsExpr GhcTc))
    by', SyntaxExprTc
    return_op')) <-
                forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen (forall p. HsStmtContext p -> HsStmtContext p
    TransStmtCtxt HsStmtContext GhcRn
    ctxt) TcExprStmtChecker
    tcMcStmt [GuardLStmt GhcRn]
    stmts
                               (Mult -> ExpRhoType
    mkCheckExpType Mult
    using_arg_ty) forall a b. (a -> b) -> a -> b
    $ \ExpRhoType
    res_ty' -> do
                    { Maybe (LocatedA (HsExpr GhcTc))
    by' <- case Maybe (LHsExpr GhcRn)
    by of
                               Maybe (LHsExpr GhcRn)
    Nothing -> forall (m :: * -> *) a. Monad m => a -> m a
    return forall a. Maybe a
    Nothing
                               Just LHsExpr GhcRn
    e  -> do { LocatedA (HsExpr GhcTc)
    e' <- LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExpr LHsExpr GhcRn
    e Mult
    by_e_ty
                                             ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall a. a -> Maybe a
    Just LocatedA (HsExpr GhcTc)
    e') }

                    -- Find the Ids (and hence types) of all old binders
                    ; [Id]
    bndr_ids <- [Name] -> TcM [Id]
    tcLookupLocalIds [Name]
    bndr_names

                    -- 'return' is only used for the binders, so we know its type.
                    --   return :: (a,b,c,..) -> m (a,b,c,..)
                    ; (()
    _, SyntaxExprTc
    return_op') <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin SyntaxExpr GhcRn
    return_op
                                           [Mult -> SyntaxOpType
    synKnownType ([Id] -> Mult
    mkBigCoreVarTupTy [Id]
    bndr_ids)]
                                           ExpRhoType
    res_ty' forall a b. (a -> b) -> a -> b
    $ \ [Mult]
    _ [Mult]
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ()

                    ; forall (m :: * -> *) a. Monad m => a -> m a
    return ([Id]
    bndr_ids, Maybe (LocatedA (HsExpr GhcTc))
    by', SyntaxExprTc
    return_op') }

           --------------- Typecheck the 'bind' function -------------
           -- (>>=) :: m2 (n (a,b,c)) -> ( n (a,b,c) -> new_res_ty ) -> res_ty
           ; Mult
    new_res_ty <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind
           ; (()
    _, SyntaxExprTc
    bind_op')  <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin SyntaxExpr GhcRn
    bind_op
                                 [ Mult -> SyntaxOpType
    synKnownType Mult
    using_res_ty
                                 , Mult -> SyntaxOpType
    synKnownType (Mult -> Mult
    n_app Mult
    tup_ty Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    new_res_ty) ]
                                 ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $ \ [Mult]
    _ [Mult]
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ()

           --------------- Typecheck the 'fmap' function -------------
           ; HsExpr GhcTc
    fmap_op' <- case TransForm
    form of
                           TransForm
    ThenForm -> forall (m :: * -> *) a. Monad m => a -> m a
    return forall (p :: Pass). HsExpr (GhcPass p)
    noExpr
                           TransForm
    _ -> forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap forall l e. GenLocated l e -> e
    unLoc forall b c a. (b -> c) -> (a -> b) -> a -> c
    . LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckPolyExpr (forall a an. a -> LocatedAn an a
    noLocA HsExpr GhcRn
    fmap_op) forall a b. (a -> b) -> a -> b
    $
                                Id -> Mult -> Mult
    mkInfForAllTy Id
    alphaTyVar forall a b. (a -> b) -> a -> b
    $
                                Id -> Mult -> Mult
    mkInfForAllTy Id
    betaTyVar  forall a b. (a -> b) -> a -> b
    $
                                (Mult
    alphaTy Mult -> Mult -> Mult
    `mkVisFunTyMany` Mult
    betaTy)
                                Mult -> Mult -> Mult
    `mkVisFunTyMany` (Mult -> Mult
    n_app Mult
    alphaTy)
                                Mult -> Mult -> Mult
    `mkVisFunTyMany` (Mult -> Mult
    n_app Mult
    betaTy)

           --------------- Typecheck the 'using' function -------------
           -- using :: ((a,b,c)->t) -> m1 (a,b,c) -> m2 (n (a,b,c))

           ; LocatedA (HsExpr GhcTc)
    using' <- LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckPolyExpr LHsExpr GhcRn
    using Mult
    using_poly_ty
           ; let final_using :: LocatedA (HsExpr GhcTc)
    final_using = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap (HsWrapper -> HsExpr GhcTc -> HsExpr GhcTc
    mkHsWrap (Mult -> HsWrapper
    WpTyApp Mult
    tup_ty)) LocatedA (HsExpr GhcTc)
    using'

           --------------- Building the bindersMap ----------------
           ; let mk_n_bndr :: Name -> TcId -> TcId
                 mk_n_bndr :: Name -> Id -> Id
    mk_n_bndr Name
    n_bndr_name Id
    bndr_id = HasDebugCallStack => Name -> Mult -> Mult -> Id
    mkLocalId Name
    n_bndr_name Mult
    Many (Mult -> Mult
    n_app (Id -> Mult
    idType Id
    bndr_id))

                 -- Ensure that every old binder of type `b` is linked up with its
                 -- new binder which should have type `n b`
                 -- See Note [GroupStmt binder map] in GHC.Hs.Expr
                 n_bndr_ids :: [Id]
    n_bndr_ids = forall a b c. String -> (a -> b -> c) -> [a] -> [b] -> [c]
    zipWithEqual String
    "tcMcStmt" Name -> Id -> Id
    mk_n_bndr [Name]
    n_bndr_names [Id]
    bndr_ids
                 bindersMap' :: [(Id, Id)]
    bindersMap' = [Id]
    bndr_ids forall a b. [a] -> [b] -> [(a, b)]
    `zip` [Id]
    n_bndr_ids

           -- Type check the thing in the environment with
           -- these new binders and return the result
           ; thing
    thing <- forall a. [Id] -> TcM a -> TcM a
    tcExtendIdEnv [Id]
    n_bndr_ids forall a b. (a -> b) -> a -> b
    $
                      ExpRhoType -> TcM thing
    thing_inside (Mult -> ExpRhoType
    mkCheckExpType Mult
    new_res_ty)

           ; forall (m :: * -> *) a. Monad m => a -> m a
    return (TransStmt { trS_stmts :: [ExprLStmt GhcTc]
    trS_stmts = [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', trS_bndrs :: [(IdP GhcTc, IdP GhcTc)]
    trS_bndrs = [(Id, Id)]
    bindersMap'
                               , trS_by :: Maybe (LHsExpr GhcTc)
    trS_by = Maybe (LocatedA (HsExpr GhcTc))
    by', trS_using :: LHsExpr GhcTc
    trS_using = LocatedA (HsExpr GhcTc)
    final_using
                               , trS_ret :: SyntaxExpr GhcTc
    trS_ret = SyntaxExprTc
    return_op', trS_bind :: SyntaxExpr GhcTc
    trS_bind = SyntaxExprTc
    bind_op'
                               , trS_ext :: XTransStmt GhcTc GhcTc (LocatedA (HsExpr GhcTc))
    trS_ext = Mult -> Mult
    n_app Mult
    tup_ty
                               , trS_fmap :: HsExpr GhcTc
    trS_fmap = HsExpr GhcTc
    fmap_op', trS_form :: TransForm
    trS_form = TransForm
    form }, thing
    thing) }

    -- A parallel set of comprehensions
    --      [ (g x, h x) | ... ; let g v = ...
    --                   | ... ; let h v = ... ]
    --
    -- It's possible that g,h are overloaded, so we need to feed the LIE from the
    -- (g x, h x) up through both lots of bindings (so we get the bindLocalMethods).
    -- Similarly if we had an existential pattern match:
    --
    --      data T = forall a. Show a => C a
    --
    --      [ (show x, show y) | ... ; C x <- ...
    --                         | ... ; C y <- ... ]
    --
    -- Then we need the LIE from (show x, show y) to be simplified against
    -- the bindings for x and y.
    --
    -- It's difficult to do this in parallel, so we rely on the renamer to
    -- ensure that g,h and x,y don't duplicate, and simply grow the environment.
    -- So the binders of the first parallel group will be in scope in the second
    -- group.  But that's fine; there's no shadowing to worry about.
    --
    -- Note: The `mzip` function will get typechecked via:
    --
    --   ParStmt [st1::t1, st2::t2, st3::t3]
    --
    --   mzip :: m st1
    --        -> (m st2 -> m st3 -> m (st2, st3))   -- recursive call
    --        -> m (st1, (st2, st3))
    --
    tcMcStmt HsStmtContext GhcRn
    ctxt (ParStmt XParStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ [ParStmtBlock GhcRn GhcRn]
    bndr_stmts_s HsExpr GhcRn
    mzip_op SyntaxExpr GhcRn
    bind_op) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do { Mult
    m_ty   <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    typeToTypeKind

           ; let mzip_ty :: Mult
    mzip_ty  = [Id] -> Mult -> Mult
    mkInfForAllTys [Id
    alphaTyVar, Id
    betaTyVar] forall a b. (a -> b) -> a -> b
    $
                            (Mult
    m_ty Mult -> Mult -> Mult
    `mkAppTy` Mult
    alphaTy)
                            Mult -> Mult -> Mult
    `mkVisFunTyMany`
                            (Mult
    m_ty Mult -> Mult -> Mult
    `mkAppTy` Mult
    betaTy)
                            Mult -> Mult -> Mult
    `mkVisFunTyMany`
                            (Mult
    m_ty Mult -> Mult -> Mult
    `mkAppTy` [Mult] -> Mult
    mkBoxedTupleTy [Mult
    alphaTy, Mult
    betaTy])
           ; HsExpr GhcTc
    mzip_op' <- forall l e. GenLocated l e -> e
    unLoc forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    `fmap` LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckPolyExpr (forall a an. a -> LocatedAn an a
    noLocA HsExpr GhcRn
    mzip_op) Mult
    mzip_ty

            -- type dummies since we don't know all binder types yet
           ; [[Mult]]
    id_tys_s <- (forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    mapM forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    mapM) (forall a b. a -> b -> a
    const (Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind))
                           [ [IdP GhcRn]
    names | ParStmtBlock XParStmtBlock GhcRn GhcRn
    _ [GuardLStmt GhcRn]
    _ [IdP GhcRn]
    names SyntaxExpr GhcRn
    _ <- [ParStmtBlock GhcRn GhcRn]
    bndr_stmts_s ]

           -- Typecheck bind:
           ; let tup_tys :: [Mult]
    tup_tys  = [ [Mult] -> Mult
    mkBigCoreTupTy [Mult]
    id_tys | [Mult]
    id_tys <- [[Mult]]
    id_tys_s ]
                 tuple_ty :: Mult
    tuple_ty = forall {t :: * -> *}. Foldable t => t Mult -> Mult
    mk_tuple_ty [Mult]
    tup_tys

           ; ((([ParStmtBlock GhcTc GhcTc]
    blocks', thing
    thing), Mult
    inner_res_ty), SyntaxExprTc
    bind_op')
               <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin SyntaxExpr GhcRn
    bind_op
                             [ Mult -> SyntaxOpType
    synKnownType (Mult
    m_ty Mult -> Mult -> Mult
    `mkAppTy` Mult
    tuple_ty)
                             , SyntaxOpType -> SyntaxOpType -> SyntaxOpType
    SynFun (Mult -> SyntaxOpType
    synKnownType Mult
    tuple_ty) SyntaxOpType
    SynRho ] ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                  \ [Mult
    inner_res_ty] [Mult]
    _ ->
                  do { ([ParStmtBlock GhcTc GhcTc], thing)
    stuff <- Mult
    -> ExpRhoType
    -> [Mult]
    -> [ParStmtBlock GhcRn GhcRn]
    -> IOEnv
         (Env TcGblEnv TcLclEnv) ([ParStmtBlock GhcTc GhcTc], thing)
    loop Mult
    m_ty (Mult -> ExpRhoType
    mkCheckExpType Mult
    inner_res_ty)
                                     [Mult]
    tup_tys [ParStmtBlock GhcRn GhcRn]
    bndr_stmts_s
                     ; forall (m :: * -> *) a. Monad m => a -> m a
    return (([ParStmtBlock GhcTc GhcTc], thing)
    stuff, Mult
    inner_res_ty) }

           ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XParStmt idL idR body
    -> [ParStmtBlock idL idR]
    -> HsExpr idR
    -> SyntaxExpr idR
    -> StmtLR idL idR body
    ParStmt Mult
    inner_res_ty [ParStmtBlock GhcTc GhcTc]
    blocks' HsExpr GhcTc
    mzip_op' SyntaxExprTc
    bind_op', thing
    thing) }

      where
        mk_tuple_ty :: t Mult -> Mult
    mk_tuple_ty t Mult
    tys = forall (t :: * -> *) a. Foldable t => (a -> a -> a) -> t a -> a
    foldr1 (\Mult
    tn Mult
    tm -> [Mult] -> Mult
    mkBoxedTupleTy [Mult
    tn, Mult
    tm]) t Mult
    tys

           -- loop :: Type                                  -- m_ty
           --      -> ExpRhoType                            -- inner_res_ty
           --      -> [TcType]                              -- tup_tys
           --      -> [ParStmtBlock Name]
           --      -> TcM ([([LStmt GhcTc], [TcId])], thing)
        loop :: Mult
    -> ExpRhoType
    -> [Mult]
    -> [ParStmtBlock GhcRn GhcRn]
    -> IOEnv
         (Env TcGblEnv TcLclEnv) ([ParStmtBlock GhcTc GhcTc], thing)
    loop Mult
    _ ExpRhoType
    inner_res_ty [] [] = do { thing
    thing <- ExpRhoType -> TcM thing
    thing_inside ExpRhoType
    inner_res_ty
                                       ; forall (m :: * -> *) a. Monad m => a -> m a
    return ([], thing
    thing) }
                                       -- matching in the branches

        loop Mult
    m_ty ExpRhoType
    inner_res_ty (Mult
    tup_ty_in : [Mult]
    tup_tys_in)
                               (ParStmtBlock XParStmtBlock GhcRn GhcRn
    x [GuardLStmt GhcRn]
    stmts [IdP GhcRn]
    names SyntaxExpr GhcRn
    return_op : [ParStmtBlock GhcRn GhcRn]
    pairs)
          = do { let m_tup_ty :: Mult
    m_tup_ty = Mult
    m_ty Mult -> Mult -> Mult
    `mkAppTy` Mult
    tup_ty_in
               ; ([GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', ([Id]
    ids, SyntaxExprTc
    return_op', [ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing))
                    <- forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcExprStmtChecker
    tcMcStmt [GuardLStmt GhcRn]
    stmts (Mult -> ExpRhoType
    mkCheckExpType Mult
    m_tup_ty) forall a b. (a -> b) -> a -> b
    $
                       \ExpRhoType
    m_tup_ty' ->
                       do { [Id]
    ids <- [Name] -> TcM [Id]
    tcLookupLocalIds [IdP GhcRn]
    names
                          ; let tup_ty :: Mult
    tup_ty = [Id] -> Mult
    mkBigCoreVarTupTy [Id]
    ids
                          ; (()
    _, SyntaxExprTc
    return_op') <-
                              forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    MCompOrigin SyntaxExpr GhcRn
    return_op
                                         [Mult -> SyntaxOpType
    synKnownType Mult
    tup_ty] ExpRhoType
    m_tup_ty' forall a b. (a -> b) -> a -> b
    $
                                         \ [Mult]
    _ [Mult]
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ()
                          ; ([ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing) <- Mult
    -> ExpRhoType
    -> [Mult]
    -> [ParStmtBlock GhcRn GhcRn]
    -> IOEnv
         (Env TcGblEnv TcLclEnv) ([ParStmtBlock GhcTc GhcTc], thing)
    loop Mult
    m_ty ExpRhoType
    inner_res_ty [Mult]
    tup_tys_in [ParStmtBlock GhcRn GhcRn]
    pairs
                          ; forall (m :: * -> *) a. Monad m => a -> m a
    return ([Id]
    ids, SyntaxExprTc
    return_op', [ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing) }
               ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR.
    XParStmtBlock idL idR
    -> [ExprLStmt idL]
    -> [IdP idR]
    -> SyntaxExpr idR
    -> ParStmtBlock idL idR
    ParStmtBlock XParStmtBlock GhcRn GhcRn
    x [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts' [Id]
    ids SyntaxExprTc
    return_op' forall a. a -> [a] -> [a]
    : [ParStmtBlock GhcTc GhcTc]
    pairs', thing
    thing) }
        loop Mult
    _ ExpRhoType
    _ [Mult]
    _ [ParStmtBlock GhcRn GhcRn]
    _ = forall a. String -> a
    panic String
    "tcMcStmt.loop"

    tcMcStmt HsStmtContext GhcRn
    _ Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt ExpRhoType
    _ ExpRhoType -> TcM thing
    _
      = forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "tcMcStmt: unexpected Stmt" (forall a. Outputable a => a -> SDoc
    ppr Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt)

    ---------------------------------------------------
    --           Do-notation
    --        (supports rebindable syntax)
    ---------------------------------------------------

    tcDoStmt :: TcExprStmtChecker

    tcDoStmt :: TcExprStmtChecker
    tcDoStmt HsStmtContext GhcRn
    _ (LastStmt XLastStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    x LocatedA (HsExpr GhcRn)
    body Maybe Bool
    noret SyntaxExpr GhcRn
    _) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do { LocatedA (HsExpr GhcTc)
    body' <- LHsExpr GhcRn -> ExpRhoType -> TcM (LHsExpr GhcTc)
    tcMonoExprNC LocatedA (HsExpr GhcRn)
    body ExpRhoType
    res_ty
           ; thing
    thing <- ExpRhoType -> TcM thing
    thing_inside (forall a. String -> a
    panic String
    "tcDoStmt: thing_inside")
           ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XLastStmt idL idR body
    -> body -> Maybe Bool -> SyntaxExpr idR -> StmtLR idL idR body
    LastStmt XLastStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    x LocatedA (HsExpr GhcTc)
    body' Maybe Bool
    noret forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr, thing
    thing) }

    tcDoStmt HsStmtContext GhcRn
    ctxt (BindStmt XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    xbsrn LPat GhcRn
    pat LocatedA (HsExpr GhcRn)
    rhs) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  {       -- Deal with rebindable syntax:
                    --       (>>=) :: rhs_ty ->_rhs_mult (pat_ty ->_pat_mult new_res_ty) ->_fun_mult res_ty
                    -- This level of generality is needed for using do-notation
                    -- in full generality; see #1537

              ((LocatedA (HsExpr GhcTc)
    rhs', Mult
    pat_mult, GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', Mult
    new_res_ty, thing
    thing), SyntaxExprTc
    bind_op')
                <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    DoOrigin (XBindStmtRn -> SyntaxExpr GhcRn
    xbsrn_bindOp XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    xbsrn) [SyntaxOpType
    SynRho, SyntaxOpType -> SyntaxOpType -> SyntaxOpType
    SynFun SyntaxOpType
    SynAny SyntaxOpType
    SynRho] ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                    \ [Mult
    rhs_ty, Mult
    pat_ty, Mult
    new_res_ty] [Mult
    rhs_mult,Mult
    fun_mult,Mult
    pat_mult] ->
                    do { LocatedA (HsExpr GhcTc)
    rhs' <-forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    rhs_mult forall a b. (a -> b) -> a -> b
    $ LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExprNC LocatedA (HsExpr GhcRn)
    rhs Mult
    rhs_ty
                       ; (GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', thing
    thing) <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    fun_mult forall a b. (a -> b) -> a -> b
    $ forall a.
    HsMatchContext GhcRn
    -> LPat GhcRn -> Scaled Mult -> TcM a -> TcM (LPat GhcTc, a)
    tcCheckPat (forall p. HsStmtContext p -> HsMatchContext p
    StmtCtxt HsStmtContext GhcRn
    ctxt) LPat GhcRn
    pat (forall a. Mult -> a -> Scaled a
    Scaled Mult
    pat_mult Mult
    pat_ty) forall a b. (a -> b) -> a -> b
    $
                                          ExpRhoType -> TcM thing
    thing_inside (Mult -> ExpRhoType
    mkCheckExpType Mult
    new_res_ty)
                       ; forall (m :: * -> *) a. Monad m => a -> m a
    return (LocatedA (HsExpr GhcTc)
    rhs', Mult
    pat_mult, GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', Mult
    new_res_ty, thing
    thing) }

            -- If (but only if) the pattern can fail, typecheck the 'fail' operator
            ; Maybe SyntaxExprTc
    fail_op' <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap forall (m :: * -> *) a. Monad m => m (m a) -> m a
    join forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    t a -> (a -> m b) -> m (t b)
    forM (XBindStmtRn -> FailOperator GhcRn
    xbsrn_failOp XBindStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    xbsrn) forall a b. (a -> b) -> a -> b
    $ \SyntaxExprRn
    fail ->
                CtOrigin
    -> LPat GhcTc
    -> SyntaxExpr GhcRn
    -> Mult
    -> TcRn (FailOperator GhcTc)
    tcMonadFailOp (LPat GhcRn -> CtOrigin
    DoPatOrigin LPat GhcRn
    pat) GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' SyntaxExprRn
    fail Mult
    new_res_ty
            ; let xbstc :: XBindStmtTc
    xbstc = XBindStmtTc
                    { xbstc_bindOp :: SyntaxExpr GhcTc
    xbstc_bindOp = SyntaxExprTc
    bind_op'
                    , xbstc_boundResultType :: Mult
    xbstc_boundResultType = Mult
    new_res_ty
                    , xbstc_boundResultMult :: Mult
    xbstc_boundResultMult = Mult
    pat_mult
                    , xbstc_failOp :: FailOperator GhcTc
    xbstc_failOp = Maybe SyntaxExprTc
    fail_op'
                    }
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XBindStmt idL idR body -> LPat idL -> body -> StmtLR idL idR body
    BindStmt XBindStmtTc
    xbstc GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' LocatedA (HsExpr GhcTc)
    rhs', thing
    thing) }

    tcDoStmt HsStmtContext GhcRn
    ctxt (ApplicativeStmt XApplicativeStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    pairs FailOperator GhcRn
    mb_join) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { let tc_app_stmts :: ExpRhoType
    -> TcM ([(SyntaxExpr GhcTc, ApplicativeArg GhcTc)], Mult, thing)
    tc_app_stmts ExpRhoType
    ty = forall t.
    HsStmtContext GhcRn
    -> [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    -> ExpRhoType
    -> (Mult -> TcM t)
    -> TcM ([(SyntaxExpr GhcTc, ApplicativeArg GhcTc)], Mult, t)
    tcApplicativeStmts HsStmtContext GhcRn
    ctxt [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    pairs ExpRhoType
    ty forall a b. (a -> b) -> a -> b
    $
                                    ExpRhoType -> TcM thing
    thing_inside forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Mult -> ExpRhoType
    mkCheckExpType
            ; (([(SyntaxExprTc, ApplicativeArg GhcTc)]
    pairs', Mult
    body_ty, thing
    thing), Maybe SyntaxExprTc
    mb_join') <- case FailOperator GhcRn
    mb_join of
                FailOperator GhcRn
    Nothing -> (, forall a. Maybe a
    Nothing) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> ExpRhoType
    -> TcM ([(SyntaxExpr GhcTc, ApplicativeArg GhcTc)], Mult, thing)
    tc_app_stmts ExpRhoType
    res_ty
                Just SyntaxExpr GhcRn
    join_op ->
                  forall (a :: * -> * -> *) b c d.
    Arrow a =>
    a b c -> a (d, b) (d, c)
    second forall a. a -> Maybe a
    Just forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$>
                  (forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    DoOrigin SyntaxExpr GhcRn
    join_op [SyntaxOpType
    SynRho] ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                   \ [Mult
    rhs_ty] [Mult
    rhs_mult] -> forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    rhs_mult forall a b. (a -> b) -> a -> b
    $ ExpRhoType
    -> TcM ([(SyntaxExpr GhcTc, ApplicativeArg GhcTc)], Mult, thing)
    tc_app_stmts (Mult -> ExpRhoType
    mkCheckExpType Mult
    rhs_ty))

            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XApplicativeStmt idL idR body
    -> [(SyntaxExpr idR, ApplicativeArg idL)]
    -> Maybe (SyntaxExpr idR)
    -> StmtLR idL idR body
    ApplicativeStmt Mult
    body_ty [(SyntaxExprTc, ApplicativeArg GhcTc)]
    pairs' Maybe SyntaxExprTc
    mb_join', thing
    thing) }

    tcDoStmt HsStmtContext GhcRn
    _ (BodyStmt XBodyStmt GhcRn GhcRn (LocatedA (HsExpr GhcRn))
    _ LocatedA (HsExpr GhcRn)
    rhs SyntaxExpr GhcRn
    then_op SyntaxExpr GhcRn
    _) ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  {       -- Deal with rebindable syntax;
                    --   (>>) :: rhs_ty -> new_res_ty -> res_ty
            ; ((LocatedA (HsExpr GhcTc)
    rhs', Mult
    rhs_ty, thing
    thing), SyntaxExprTc
    then_op')
                <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    DoOrigin SyntaxExpr GhcRn
    then_op [SyntaxOpType
    SynRho, SyntaxOpType
    SynRho] ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                   \ [Mult
    rhs_ty, Mult
    new_res_ty] [Mult
    rhs_mult,Mult
    fun_mult] ->
                   do { LocatedA (HsExpr GhcTc)
    rhs' <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    rhs_mult forall a b. (a -> b) -> a -> b
    $ LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExprNC LocatedA (HsExpr GhcRn)
    rhs Mult
    rhs_ty
                      ; thing
    thing <- forall a. Mult -> TcM a -> TcM a
    tcScalingUsage Mult
    fun_mult forall a b. (a -> b) -> a -> b
    $ ExpRhoType -> TcM thing
    thing_inside (Mult -> ExpRhoType
    mkCheckExpType Mult
    new_res_ty)
                      ; forall (m :: * -> *) a. Monad m => a -> m a
    return (LocatedA (HsExpr GhcTc)
    rhs', Mult
    rhs_ty, thing
    thing) }
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL idR body.
    XBodyStmt idL idR body
    -> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
    BodyStmt Mult
    rhs_ty LocatedA (HsExpr GhcTc)
    rhs' SyntaxExprTc
    then_op' forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
    noSyntaxExpr, thing
    thing) }

    tcDoStmt HsStmtContext GhcRn
    ctxt (RecStmt { recS_stmts :: forall idL idR body.
    StmtLR idL idR body -> XRec idR [LStmtLR idL idR body]
    recS_stmts = L SrcSpanAnnL
    l [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (HsExpr GhcRn)))]
    stmts, recS_later_ids :: forall idL idR body. StmtLR idL idR body -> [IdP idR]
    recS_later_ids = [IdP GhcRn]
    later_names
                           , recS_rec_ids :: forall idL idR body. StmtLR idL idR body -> [IdP idR]
    recS_rec_ids = [IdP GhcRn]
    rec_names, recS_ret_fn :: forall idL idR body. StmtLR idL idR body -> SyntaxExpr idR
    recS_ret_fn = SyntaxExpr GhcRn
    ret_op
                           , recS_mfix_fn :: forall idL idR body. StmtLR idL idR body -> SyntaxExpr idR
    recS_mfix_fn = SyntaxExpr GhcRn
    mfix_op, recS_bind_fn :: forall idL idR body. StmtLR idL idR body -> SyntaxExpr idR
    recS_bind_fn = SyntaxExpr GhcRn
    bind_op })
             ExpRhoType
    res_ty ExpRhoType -> TcM thing
    thing_inside
      = do  { let tup_names :: [Name]
    tup_names = [IdP GhcRn]
    rec_names forall a. [a] -> [a] -> [a]
    ++ forall a. (a -> Bool) -> [a] -> [a]
    filterOut (forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
    `elem` [IdP GhcRn]
    rec_names) [IdP GhcRn]
    later_names
            ; [Mult]
    tup_elt_tys <- Arity -> Mult -> TcM [Mult]
    newFlexiTyVarTys (forall (t :: * -> *) a. Foldable t => t a -> Arity
    length [Name]
    tup_names) Mult
    liftedTypeKind
            ; let tup_ids :: [Id]
    tup_ids = forall a b c. (a -> b -> c) -> [a] -> [b] -> [c]
    zipWith (\Name
    n Mult
    t -> HasDebugCallStack => Name -> Mult -> Mult -> Id
    mkLocalId Name
    n Mult
    Many Mult
    t) [Name]
    tup_names [Mult]
    tup_elt_tys
                    -- Many because it's a recursive definition
                  tup_ty :: Mult
    tup_ty  = [Mult] -> Mult
    mkBigCoreTupTy [Mult]
    tup_elt_tys

            ; forall a. [Id] -> TcM a -> TcM a
    tcExtendIdEnv [Id]
    tup_ids forall a b. (a -> b) -> a -> b
    $ do
            { (([GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', (SyntaxExprTc
    ret_op', [HsExpr GhcTc]
    tup_rets)), Mult
    stmts_ty)
                    <- forall a. (ExpRhoType -> TcM a) -> TcM (a, Mult)
    tcInfer forall a b. (a -> b) -> a -> b
    $ \ ExpRhoType
    exp_ty ->
                       forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext GhcRn
    ctxt TcExprStmtChecker
    tcDoStmt [GenLocated SrcSpanAnnA (Stmt GhcRn (LocatedA (HsExpr GhcRn)))]
    stmts ExpRhoType
    exp_ty forall a b. (a -> b) -> a -> b
    $ \ ExpRhoType
    inner_res_ty ->
                       do { [HsExpr GhcTc]
    tup_rets <- forall (m :: * -> *) a b c.
    Applicative m =>
    (a -> b -> m c) -> [a] -> [b] -> m [c]
    zipWithM Name -> ExpRhoType -> TcM (HsExpr GhcTc)
    tcCheckId [Name]
    tup_names
                                          (forall a b. (a -> b) -> [a] -> [b]
    map Mult -> ExpRhoType
    mkCheckExpType [Mult]
    tup_elt_tys)
                                 -- Unify the types of the "final" Ids (which may
                                 -- be polymorphic) with those of "knot-tied" Ids
                          ; (()
    _, SyntaxExprTc
    ret_op')
                              <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    DoOrigin SyntaxExpr GhcRn
    ret_op [Mult -> SyntaxOpType
    synKnownType Mult
    tup_ty]
                                            ExpRhoType
    inner_res_ty forall a b. (a -> b) -> a -> b
    $ \[Mult]
    _ [Mult]
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ()
                          ; forall (m :: * -> *) a. Monad m => a -> m a
    return (SyntaxExprTc
    ret_op', [HsExpr GhcTc]
    tup_rets) }

            ; ((()
    _, SyntaxExprTc
    mfix_op'), Mult
    mfix_res_ty)
                <- forall a. (ExpRhoType -> TcM a) -> TcM (a, Mult)
    tcInfer forall a b. (a -> b) -> a -> b
    $ \ ExpRhoType
    exp_ty ->
                   forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    DoOrigin SyntaxExpr GhcRn
    mfix_op
                              [Mult -> SyntaxOpType
    synKnownType (Mult -> Mult -> Mult
    mkVisFunTyMany Mult
    tup_ty Mult
    stmts_ty)] ExpRhoType
    exp_ty forall a b. (a -> b) -> a -> b
    $
                   \ [Mult]
    _ [Mult]
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ()

            ; ((thing
    thing, Mult
    new_res_ty), SyntaxExprTc
    bind_op')
                <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    DoOrigin SyntaxExpr GhcRn
    bind_op
                              [ Mult -> SyntaxOpType
    synKnownType Mult
    mfix_res_ty
                              , SyntaxOpType -> SyntaxOpType -> SyntaxOpType
    SynFun (Mult -> SyntaxOpType
    synKnownType Mult
    tup_ty) SyntaxOpType
    SynRho ]
                              ExpRhoType
    res_ty forall a b. (a -> b) -> a -> b
    $
                   \ [Mult
    new_res_ty] [Mult]
    _ ->
                   do { thing
    thing <- ExpRhoType -> TcM thing
    thing_inside (Mult -> ExpRhoType
    mkCheckExpType Mult
    new_res_ty)
                      ; forall (m :: * -> *) a. Monad m => a -> m a
    return (thing
    thing, Mult
    new_res_ty) }

            ; let rec_ids :: [Id]
    rec_ids = forall b a. [b] -> [a] -> [a]
    takeList [IdP GhcRn]
    rec_names [Id]
    tup_ids
            ; [Id]
    later_ids <- [Name] -> TcM [Id]
    tcLookupLocalIds [IdP GhcRn]
    later_names
            ; String -> SDoc -> TcRn ()
    traceTc String
    "tcdo" forall a b. (a -> b) -> a -> b
    $ [SDoc] -> SDoc
    vcat [forall a. Outputable a => a -> SDoc
    ppr [Id]
    rec_ids SDoc -> SDoc -> SDoc
    <+> forall a. Outputable a => a -> SDoc
    ppr (forall a b. (a -> b) -> [a] -> [b]
    map Id -> Mult
    idType [Id]
    rec_ids),
                                     forall a. Outputable a => a -> SDoc
    ppr [Id]
    later_ids SDoc -> SDoc -> SDoc
    <+> forall a. Outputable a => a -> SDoc
    ppr (forall a b. (a -> b) -> [a] -> [b]
    map Id -> Mult
    idType [Id]
    later_ids)]
            ; forall (m :: * -> *) a. Monad m => a -> m a
    return (RecStmt { recS_stmts :: XRec GhcTc [LStmt GhcTc (LocatedA (HsExpr GhcTc))]
    recS_stmts = forall l e. l -> e -> GenLocated l e
    L SrcSpanAnnL
    l [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', recS_later_ids :: [IdP GhcTc]
    recS_later_ids = [Id]
    later_ids
                              , recS_rec_ids :: [IdP GhcTc]
    recS_rec_ids = [Id]
    rec_ids, recS_ret_fn :: SyntaxExpr GhcTc
    recS_ret_fn = SyntaxExprTc
    ret_op'
                              , recS_mfix_fn :: SyntaxExpr GhcTc
    recS_mfix_fn = SyntaxExprTc
    mfix_op', recS_bind_fn :: SyntaxExpr GhcTc
    recS_bind_fn = SyntaxExprTc
    bind_op'
                              , recS_ext :: XRecStmt GhcTc GhcTc (LocatedA (HsExpr GhcTc))
    recS_ext = RecStmtTc
                                { recS_bind_ty :: Mult
    recS_bind_ty = Mult
    new_res_ty
                                , recS_later_rets :: [HsExpr GhcTc]
    recS_later_rets = []
                                , recS_rec_rets :: [HsExpr GhcTc]
    recS_rec_rets = [HsExpr GhcTc]
    tup_rets
                                , recS_ret_ty :: Mult
    recS_ret_ty = Mult
    stmts_ty} }, thing
    thing)
            }}

    tcDoStmt HsStmtContext GhcRn
    _ Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt ExpRhoType
    _ ExpRhoType -> TcM thing
    _
      = forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "tcDoStmt: unexpected Stmt" (forall a. Outputable a => a -> SDoc
    ppr Stmt GhcRn (LocatedA (HsExpr GhcRn))
    stmt)

    ---------------------------------------------------
    -- MonadFail Proposal warnings
    ---------------------------------------------------

    -- The idea behind issuing MonadFail warnings is that we add them whenever a
    -- failable pattern is encountered. However, instead of throwing a type error
    -- when the constraint cannot be satisfied, we only issue a warning in
    -- "GHC.Tc.Errors".

    tcMonadFailOp :: CtOrigin
                  -> LPat GhcTc
                  -> SyntaxExpr GhcRn    -- The fail op
                  -> TcType              -- Type of the whole do-expression
                  -> TcRn (FailOperator GhcTc)  -- Typechecked fail op
    -- Get a 'fail' operator expression, to use if the pattern match fails.
    -- This won't be used in cases where we've already determined the pattern
    -- match can't fail (so the fail op is Nothing), however, it seems that the
    -- isIrrefutableHsPat test is still required here for some reason I haven't
    -- yet determined.
    tcMonadFailOp :: CtOrigin
    -> LPat GhcTc
    -> SyntaxExpr GhcRn
    -> Mult
    -> TcRn (FailOperator GhcTc)
    tcMonadFailOp CtOrigin
    orig LPat GhcTc
    pat SyntaxExpr GhcRn
    fail_op Mult
    res_ty = do
        DynFlags
    dflags <- forall (m :: * -> *). HasDynFlags m => m DynFlags
    getDynFlags
        if forall (p :: Pass).
    OutputableBndrId p =>
    DynFlags -> LPat (GhcPass p) -> Bool
    isIrrefutableHsPat DynFlags
    dflags LPat GhcTc
    pat
          then forall (m :: * -> *) a. Monad m => a -> m a
    return forall a. Maybe a
    Nothing
          else forall a. a -> Maybe a
    Just forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall a b. (a, b) -> b
    snd forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> (forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    orig SyntaxExpr GhcRn
    fail_op [Mult -> SyntaxOpType
    synKnownType Mult
    stringTy]
                                (Mult -> ExpRhoType
    mkCheckExpType Mult
    res_ty) forall a b. (a -> b) -> a -> b
    $ \[Mult]
    _ [Mult]
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ())

    {-
    Note [Treat rebindable syntax first]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    When typechecking
            do { bar; ... } :: IO ()
    we want to typecheck 'bar' in the knowledge that it should be an IO thing,
    pushing info from the context into the RHS.  To do this, we check the
    rebindable syntax first, and push that information into (tcLExprNC rhs).
    Otherwise the error shows up when checking the rebindable syntax, and
    the expected/inferred stuff is back to front (see #3613).

    Note [typechecking ApplicativeStmt]

    join ((\pat1 ... patn -> body) <$> e1 <*> ... <*> en)

    fresh type variables:
       pat_ty_1..pat_ty_n
       exp_ty_1..exp_ty_n
       t_1..t_(n-1)

    body  :: body_ty
    (\pat1 ... patn -> body) :: pat_ty_1 -> ... -> pat_ty_n -> body_ty
    pat_i :: pat_ty_i
    e_i   :: exp_ty_i
    <$>   :: (pat_ty_1 -> ... -> pat_ty_n -> body_ty) -> exp_ty_1 -> t_1
    <*>_i :: t_(i-1) -> exp_ty_i -> t_i
    join :: tn -> res_ty
    -}

    tcApplicativeStmts
      :: HsStmtContext GhcRn
      -> [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
      -> ExpRhoType                         -- rhs_ty
      -> (TcRhoType -> TcM t)               -- thing_inside
      -> TcM ([(SyntaxExpr GhcTc, ApplicativeArg GhcTc)], Type, t)

    tcApplicativeStmts :: forall t.
    HsStmtContext GhcRn
    -> [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    -> ExpRhoType
    -> (Mult -> TcM t)
    -> TcM ([(SyntaxExpr GhcTc, ApplicativeArg GhcTc)], Mult, t)
    tcApplicativeStmts HsStmtContext GhcRn
    ctxt [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    pairs ExpRhoType
    rhs_ty Mult -> TcM t
    thing_inside
     = do { Mult
    body_ty <- Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind
          ; let arity :: Arity
    arity = forall (t :: * -> *) a. Foldable t => t a -> Arity
    length [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    pairs
          ; [ExpRhoType]
    ts <- forall (m :: * -> *) a. Applicative m => Arity -> m a -> m [a]
    replicateM (Arity
    arityforall a. Num a => a -> a -> a
    -Arity
    1) forall a b. (a -> b) -> a -> b
    $ TcM ExpRhoType
    newInferExpType
          ; [Mult]
    exp_tys <- forall (m :: * -> *) a. Applicative m => Arity -> m a -> m [a]
    replicateM Arity
    arity forall a b. (a -> b) -> a -> b
    $ Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind
          ; [Mult]
    pat_tys <- forall (m :: * -> *) a. Applicative m => Arity -> m a -> m [a]
    replicateM Arity
    arity forall a b. (a -> b) -> a -> b
    $ Mult -> TcM Mult
    newFlexiTyVarTy Mult
    liftedTypeKind
          ; let fun_ty :: Mult
    fun_ty = [Mult] -> Mult -> Mult
    mkVisFunTysMany [Mult]
    pat_tys Mult
    body_ty

           -- NB. do the <$>,<*> operators first, we don't want type errors here
           --     i.e. goOps before goArgs
           -- See Note [Treat rebindable syntax first]
          ; let ([SyntaxExprRn]
    ops, [ApplicativeArg GhcRn]
    args) = forall a b. [(a, b)] -> ([a], [b])
    unzip [(SyntaxExpr GhcRn, ApplicativeArg GhcRn)]
    pairs
          ; [SyntaxExprTc]
    ops' <- Mult
    -> [(SyntaxExprRn, ExpRhoType, Mult)]
    -> IOEnv (Env TcGblEnv TcLclEnv) [SyntaxExprTc]
    goOps Mult
    fun_ty (forall a b c. [a] -> [b] -> [c] -> [(a, b, c)]
    zip3 [SyntaxExprRn]
    ops ([ExpRhoType]
    ts forall a. [a] -> [a] -> [a]
    ++ [ExpRhoType
    rhs_ty]) [Mult]
    exp_tys)

          -- Typecheck each ApplicativeArg separately
          -- See Note [ApplicativeDo and constraints]
          ; [ApplicativeArg GhcTc]
    args' <- forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    mapM (Mult
    -> (ApplicativeArg GhcRn, Mult, Mult) -> TcM (ApplicativeArg GhcTc)
    goArg Mult
    body_ty) (forall a b c. [a] -> [b] -> [c] -> [(a, b, c)]
    zip3 [ApplicativeArg GhcRn]
    args [Mult]
    pat_tys [Mult]
    exp_tys)

          -- Bring into scope all the things bound by the args,
          -- and typecheck the thing_inside
          -- See Note [ApplicativeDo and constraints]
          ; t
    res <- forall a. [Id] -> TcM a -> TcM a
    tcExtendIdEnv (forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap ApplicativeArg GhcTc -> [Id]
    get_arg_bndrs [ApplicativeArg GhcTc]
    args') forall a b. (a -> b) -> a -> b
    $
                   Mult -> TcM t
    thing_inside Mult
    body_ty

          ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall a b. [a] -> [b] -> [(a, b)]
    zip [SyntaxExprTc]
    ops' [ApplicativeArg GhcTc]
    args', Mult
    body_ty, t
    res) }
      where
        goOps :: Mult
    -> [(SyntaxExprRn, ExpRhoType, Mult)]
    -> IOEnv (Env TcGblEnv TcLclEnv) [SyntaxExprTc]
    goOps Mult
    _ [] = forall (m :: * -> *) a. Monad m => a -> m a
    return []
        goOps Mult
    t_left ((SyntaxExprRn
    op,ExpRhoType
    t_i,Mult
    exp_ty) : [(SyntaxExprRn, ExpRhoType, Mult)]
    ops)
          = do { (()
    _, SyntaxExprTc
    op')
                   <- forall a.
    CtOrigin
    -> SyntaxExprRn
    -> [SyntaxOpType]
    -> ExpRhoType
    -> ([Mult] -> [Mult] -> TcM a)
    -> TcM (a, SyntaxExprTc)
    tcSyntaxOp CtOrigin
    DoOrigin SyntaxExprRn
    op
                                 [Mult -> SyntaxOpType
    synKnownType Mult
    t_left, Mult -> SyntaxOpType
    synKnownType Mult
    exp_ty] ExpRhoType
    t_i forall a b. (a -> b) -> a -> b
    $
                       \ [Mult]
    _ [Mult]
    _ -> forall (m :: * -> *) a. Monad m => a -> m a
    return ()
               ; Mult
    t_i <- ExpRhoType -> TcM Mult
    readExpType ExpRhoType
    t_i
               ; [SyntaxExprTc]
    ops' <- Mult
    -> [(SyntaxExprRn, ExpRhoType, Mult)]
    -> IOEnv (Env TcGblEnv TcLclEnv) [SyntaxExprTc]
    goOps Mult
    t_i [(SyntaxExprRn, ExpRhoType, Mult)]
    ops
               ; forall (m :: * -> *) a. Monad m => a -> m a
    return (SyntaxExprTc
    op' forall a. a -> [a] -> [a]
    : [SyntaxExprTc]
    ops') }

        goArg :: Type -> (ApplicativeArg GhcRn, Type, Type)
              -> TcM (ApplicativeArg GhcTc)

        goArg :: Mult
    -> (ApplicativeArg GhcRn, Mult, Mult) -> TcM (ApplicativeArg GhcTc)
    goArg Mult
    body_ty (ApplicativeArgOne
                        { xarg_app_arg_one :: forall idL. ApplicativeArg idL -> XApplicativeArgOne idL
    xarg_app_arg_one = XApplicativeArgOne GhcRn
    fail_op
                        , app_arg_pattern :: forall idL. ApplicativeArg idL -> LPat idL
    app_arg_pattern = LPat GhcRn
    pat
                        , arg_expr :: forall idL. ApplicativeArg idL -> LHsExpr idL
    arg_expr = LHsExpr GhcRn
    rhs
                        , Bool
    is_body_stmt :: forall idL. ApplicativeArg idL -> Bool
    is_body_stmt :: Bool
    ..
                        }, Mult
    pat_ty, Mult
    exp_ty)
          = forall a. SrcSpan -> TcRn a -> TcRn a
    setSrcSpan (SrcSpan -> SrcSpan -> SrcSpan
    combineSrcSpans (forall a e. GenLocated (SrcSpanAnn' a) e -> SrcSpan
    getLocA LPat GhcRn
    pat) (forall a e. GenLocated (SrcSpanAnn' a) e -> SrcSpan
    getLocA LHsExpr GhcRn
    rhs)) forall a b. (a -> b) -> a -> b
    $
            forall a. SDoc -> TcM a -> TcM a
    addErrCtxt (forall (idL :: Pass) (idR :: Pass) body.
    (OutputableBndrId idL, OutputableBndrId idR, Outputable body,
     Anno (StmtLR (GhcPass idL) (GhcPass idR) body) ~ SrcSpanAnnA) =>
    HsStmtContext (GhcPass idL)
    -> StmtLR (GhcPass idL) (GhcPass idR) body -> SDoc
    pprStmtInCtxt HsStmtContext GhcRn
    ctxt (forall (bodyR :: * -> *).
    LPat GhcRn
    -> LocatedA (bodyR GhcRn)
    -> StmtLR GhcRn GhcRn (LocatedA (bodyR GhcRn))
    mkRnBindStmt LPat GhcRn
    pat LHsExpr GhcRn
    rhs))   forall a b. (a -> b) -> a -> b
    $
            do { LocatedA (HsExpr GhcTc)
    rhs'      <- LHsExpr GhcRn -> Mult -> TcM (LHsExpr GhcTc)
    tcCheckMonoExprNC LHsExpr GhcRn
    rhs Mult
    exp_ty
               ; (GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', ()
    _) <- forall a.
    HsMatchContext GhcRn
    -> LPat GhcRn -> Scaled Mult -> TcM a -> TcM (LPat GhcTc, a)
    tcCheckPat (forall p. HsStmtContext p -> HsMatchContext p
    StmtCtxt HsStmtContext GhcRn
    ctxt) LPat GhcRn
    pat (forall a. a -> Scaled a
    unrestricted Mult
    pat_ty) forall a b. (a -> b) -> a -> b
    $
                              forall (m :: * -> *) a. Monad m => a -> m a
    return ()
               ; Maybe SyntaxExprTc
    fail_op' <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap forall (m :: * -> *) a. Monad m => m (m a) -> m a
    join forall b c a. (b -> c) -> (a -> b) -> a -> c
    . forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    t a -> (a -> m b) -> m (t b)
    forM XApplicativeArgOne GhcRn
    fail_op forall a b. (a -> b) -> a -> b
    $ \SyntaxExprRn
    fail ->
                   CtOrigin
    -> LPat GhcTc
    -> SyntaxExpr GhcRn
    -> Mult
    -> TcRn (FailOperator GhcTc)
    tcMonadFailOp (LPat GhcRn -> CtOrigin
    DoPatOrigin LPat GhcRn
    pat) GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' SyntaxExprRn
    fail Mult
    body_ty

               ; forall (m :: * -> *) a. Monad m => a -> m a
    return (ApplicativeArgOne
                          { xarg_app_arg_one :: XApplicativeArgOne GhcTc
    xarg_app_arg_one = Maybe SyntaxExprTc
    fail_op'
                          , app_arg_pattern :: LPat GhcTc
    app_arg_pattern = GenLocated SrcSpanAnnA (Pat GhcTc)
    pat'
                          , arg_expr :: LHsExpr GhcTc
    arg_expr        = LocatedA (HsExpr GhcTc)
    rhs'
                          , Bool
    is_body_stmt :: Bool
    is_body_stmt :: Bool
    .. }
                        ) }

        goArg Mult
    _body_ty (ApplicativeArgMany XApplicativeArgMany GhcRn
    x [GuardLStmt GhcRn]
    stmts HsExpr GhcRn
    ret LPat GhcRn
    pat HsStmtContext (ApplicativeArgStmCtxPass GhcRn)
    ctxt, Mult
    pat_ty, Mult
    exp_ty)
          = do { ([GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts', (HsExpr GhcTc
    ret',GenLocated SrcSpanAnnA (Pat GhcTc)
    pat')) <-
                    forall (body :: * -> *) rho_type thing.
    AnnoBody body =>
    HsStmtContext GhcRn
    -> TcStmtChecker body rho_type
    -> [LStmt GhcRn (LocatedA (body GhcRn))]
    -> rho_type
    -> (rho_type -> TcM thing)
    -> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
    tcStmtsAndThen HsStmtContext (ApplicativeArgStmCtxPass GhcRn)
    ctxt TcExprStmtChecker
    tcDoStmt [GuardLStmt GhcRn]
    stmts (Mult -> ExpRhoType
    mkCheckExpType Mult
    exp_ty) forall a b. (a -> b) -> a -> b
    $
                    \ExpRhoType
    res_ty  -> do
                      { HsExpr GhcTc
    ret'      <- HsExpr GhcRn -> ExpRhoType -> TcM (HsExpr GhcTc)
    tcExpr HsExpr GhcRn
    ret ExpRhoType
    res_ty
                      ; (GenLocated SrcSpanAnnA (Pat GhcTc)
    pat', ()
    _) <- forall a.
    HsMatchContext GhcRn
    -> LPat GhcRn -> Scaled Mult -> TcM a -> TcM (LPat GhcTc, a)
    tcCheckPat (forall p. HsStmtContext p -> HsMatchContext p
    StmtCtxt HsStmtContext (ApplicativeArgStmCtxPass GhcRn)
    ctxt) LPat GhcRn
    pat (forall a. a -> Scaled a
    unrestricted Mult
    pat_ty) forall a b. (a -> b) -> a -> b
    $
                                     forall (m :: * -> *) a. Monad m => a -> m a
    return ()
                      ; forall (m :: * -> *) a. Monad m => a -> m a
    return (HsExpr GhcTc
    ret', GenLocated SrcSpanAnnA (Pat GhcTc)
    pat')
                      }
               ; forall (m :: * -> *) a. Monad m => a -> m a
    return (forall idL.
    XApplicativeArgMany idL
    -> [ExprLStmt idL]
    -> HsExpr idL
    -> LPat idL
    -> HsStmtContext (ApplicativeArgStmCtxPass idL)
    -> ApplicativeArg idL
    ApplicativeArgMany XApplicativeArgMany GhcRn
    x [GenLocated
       (Anno (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc))))
       (StmtLR GhcTc GhcTc (LocatedA (HsExpr GhcTc)))]
    stmts' HsExpr GhcTc
    ret' GenLocated SrcSpanAnnA (Pat GhcTc)
    pat' HsStmtContext (ApplicativeArgStmCtxPass GhcRn)
    ctxt) }

        get_arg_bndrs :: ApplicativeArg GhcTc -> [Id]
        get_arg_bndrs :: ApplicativeArg GhcTc -> [Id]
    get_arg_bndrs (ApplicativeArgOne { app_arg_pattern :: forall idL. ApplicativeArg idL -> LPat idL
    app_arg_pattern = LPat GhcTc
    pat }) = forall p. CollectPass p => CollectFlag p -> LPat p -> [IdP p]
    collectPatBinders forall p. CollectFlag p
    CollNoDictBinders LPat GhcTc
    pat
        get_arg_bndrs (ApplicativeArgMany { bv_pattern :: forall idL. ApplicativeArg idL -> LPat idL
    bv_pattern =  LPat GhcTc
    pat })    = forall p. CollectPass p => CollectFlag p -> LPat p -> [IdP p]
    collectPatBinders forall p. CollectFlag p
    CollNoDictBinders LPat GhcTc
    pat

    {- Note [ApplicativeDo and constraints]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    An applicative-do is supposed to take place in parallel, so
    constraints bound in one arm can't possibly be available in another
    (#13242).  Our current rule is this (more details and discussion
    on the ticket). Consider

       ...stmts...
       ApplicativeStmts [arg1, arg2, ... argN]
       ...more stmts...

    where argi :: ApplicativeArg. Each 'argi' itself contains one or more Stmts.
    Now, we say that:

    * Constraints required by the argi can be solved from
      constraint bound by ...stmts...

    * Constraints and existentials bound by the argi are not available
      to solve constraints required either by argj (where i /= j),
      or by ...more stmts....

    * Within the stmts of each 'argi' individually, however, constraints bound
      by earlier stmts can be used to solve later ones.

    To achieve this, we just typecheck each 'argi' separately, bring all
    the variables they bind into scope, and typecheck the thing_inside.

    ************************************************************************
    *                                                                      *
    \subsection{Errors and contexts}
    *                                                                      *
    ************************************************************************

    @sameNoOfArgs@ takes a @[RenamedMatch]@ and decides whether the same
    number of args are used in each equation.
    -}

    checkArgs :: AnnoBody body
              => Name -> MatchGroup GhcRn (LocatedA (body GhcRn)) -> TcM ()
    checkArgs :: forall (body :: * -> *).
    AnnoBody body =>
    Name -> MatchGroup GhcRn (LocatedA (body GhcRn)) -> TcRn ()
    checkArgs Name
    _ (MG { mg_alts :: forall p body. MatchGroup p body -> XRec p [LMatch p body]
    mg_alts = L SrcSpanAnnL
    _ [] })
        = forall (m :: * -> *) a. Monad m => a -> m a
    return ()
    checkArgs Name
    fun (MG { mg_alts :: forall p body. MatchGroup p body -> XRec p [LMatch p body]
    mg_alts = L SrcSpanAnnL
    _ (LocatedA (Match GhcRn (LocatedA (body GhcRn)))
    match1:[LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    matches) })
        | forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    bad_matches
        = forall (m :: * -> *) a. Monad m => a -> m a
    return ()
        | Bool
    otherwise
        = forall a. SDoc -> TcM a
    failWithTc ([SDoc] -> SDoc
    vcat [ String -> SDoc
    text String
    "Equations for" SDoc -> SDoc -> SDoc
    <+> SDoc -> SDoc
    quotes (forall a. Outputable a => a -> SDoc
    ppr Name
    fun) SDoc -> SDoc -> SDoc
    <+>
                             String -> SDoc
    text String
    "have different numbers of arguments"
                           , Arity -> SDoc -> SDoc
    nest Arity
    2 (forall a. Outputable a => a -> SDoc
    ppr (forall a e. GenLocated (SrcSpanAnn' a) e -> SrcSpan
    getLocA LocatedA (Match GhcRn (LocatedA (body GhcRn)))
    match1))
                           , Arity -> SDoc -> SDoc
    nest Arity
    2 (forall a. Outputable a => a -> SDoc
    ppr (forall a e. GenLocated (SrcSpanAnn' a) e -> SrcSpan
    getLocA (forall a. [a] -> a
    head [LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    bad_matches)))])
      where
        n_args1 :: Arity
    n_args1 = forall body1. LocatedA (Match GhcRn body1) -> Arity
    args_in_match LocatedA (Match GhcRn (LocatedA (body GhcRn)))
    match1
        bad_matches :: [LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    bad_matches = [LocatedA (Match GhcRn (LocatedA (body GhcRn)))
    m | LocatedA (Match GhcRn (LocatedA (body GhcRn)))
    m <- [LocatedA (Match GhcRn (LocatedA (body GhcRn)))]
    matches, forall body1. LocatedA (Match GhcRn body1) -> Arity
    args_in_match LocatedA (Match GhcRn (LocatedA (body GhcRn)))
    m forall a. Eq a => a -> a -> Bool
    /= Arity
    n_args1]

        args_in_match :: (LocatedA (Match GhcRn body1) -> Int)
        args_in_match :: forall body1. LocatedA (Match GhcRn body1) -> Arity
    args_in_match (L SrcSpanAnnA
    _ (Match { m_pats :: forall p body. Match p body -> [LPat p]
    m_pats = [LPat GhcRn]
    pats })) = forall (t :: * -> *) a. Foldable t => t a -> Arity
    length [LPat GhcRn]
    pats