{-# LANGUAGE CPP #-}
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE NondecreasingIndentation #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiWayIf #-}

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

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

-}

-- | Typechecking a whole module
--
-- https://gitlab.haskell.org/ghc/ghc/wikis/commentary/compiler/type-checker
module GHC.Tc.Module (
        tcRnStmt, tcRnExpr, TcRnExprMode(..), tcRnType,
        tcRnImportDecls,
        tcRnLookupRdrName,
        getModuleInterface,
        tcRnDeclsi,
        isGHCiMonad,
        runTcInteractive,    -- Used by GHC API clients (#8878)
        tcRnLookupName,
        tcRnGetInfo,
        tcRnModule, tcRnModuleTcRnM,
        tcTopSrcDecls,
        rnTopSrcDecls,
        checkBootDecl, checkHiBootIface',
        findExtraSigImports,
        implicitRequirements,
        checkUnit,
        mergeSignatures,
        tcRnMergeSignatures,
        instantiateSignature,
        tcRnInstantiateSignature,
        loadUnqualIfaces,
        -- More private...
        badReexportedBootThing,
        checkBootDeclM,
        missingBootThing,
        getRenamedStuff, RenamedStuff
    ) where

import GHC.Prelude

import GHC.Driver.Env
import GHC.Driver.Plugins
import GHC.Driver.Session

import GHC.Tc.Errors.Hole.FitTypes ( HoleFitPluginR (..) )
import {-# SOURCE #-} GHC.Tc.Gen.Splice ( finishTH, runRemoteModFinalizers )
import GHC.Tc.Gen.HsType
import GHC.Tc.Validity( checkValidType )
import GHC.Tc.Gen.Match
import GHC.Tc.Utils.Unify( checkConstraints, tcSubTypeSigma )
import GHC.Tc.Utils.Zonk
import GHC.Tc.Gen.Expr
import GHC.Tc.Gen.App( tcInferSigma )
import GHC.Tc.Utils.Monad
import GHC.Tc.Gen.Export
import GHC.Tc.Types.Evidence
import GHC.Tc.Types.Constraint
import GHC.Tc.Types.Origin
import GHC.Tc.Instance.Family
import GHC.Tc.Gen.Annotation
import GHC.Tc.Gen.Bind
import GHC.Tc.Gen.Default
import GHC.Tc.Utils.Env
import GHC.Tc.Gen.Rule
import GHC.Tc.Gen.Foreign
import GHC.Tc.TyCl.Instance
import GHC.Tc.Utils.TcMType
import GHC.Tc.Utils.TcType
import GHC.Tc.Utils.Instantiate (tcGetInsts)
import GHC.Tc.Solver
import GHC.Tc.TyCl
import GHC.Tc.Instance.Typeable ( mkTypeableBinds )
import GHC.Tc.Utils.Backpack

import GHC.Rename.Splice ( rnTopSpliceDecls, traceSplice, SpliceInfo(..) )
import GHC.Rename.HsType
import GHC.Rename.Expr
import GHC.Rename.Utils  ( HsDocContext(..) )
import GHC.Rename.Fixity ( lookupFixityRn )
import GHC.Rename.Names
import GHC.Rename.Env
import GHC.Rename.Module

import GHC.Iface.Syntax   ( ShowSub(..), showToHeader )
import GHC.Iface.Type     ( ShowForAllFlag(..) )
import GHC.Iface.Env     ( externaliseName )
import GHC.Iface.Make   ( coAxiomToIfaceDecl )
import GHC.Iface.Load

import GHC.Builtin.Types ( unitTy, mkListTy )
import GHC.Builtin.Names
import GHC.Builtin.Utils

import GHC.Hs
import GHC.Hs.Dump

import GHC.Core.PatSyn    ( pprPatSynType )
import GHC.Core.Predicate ( classMethodTy )
import GHC.Core.FVs         ( orphNamesOfFamInst )
import GHC.Core.InstEnv
import GHC.Core.TyCon
import GHC.Core.ConLike
import GHC.Core.DataCon
import GHC.Core.Type
import GHC.Core.Class
import GHC.Core.Coercion.Axiom
import GHC.Core.Unify( RoughMatchTc(..) )
import GHC.Core.FamInstEnv
   ( FamInst, pprFamInst, famInstsRepTyCons
   , famInstEnvElts, extendFamInstEnvList, normaliseType )

import GHC.Parser.Header       ( mkPrelImports )

import GHC.IfaceToCore

import GHC.Runtime.Context

import GHC.Utils.Error
import GHC.Utils.Outputable as Outputable
import GHC.Utils.Panic
import GHC.Utils.Misc
import GHC.Utils.Logger

import GHC.Types.Error
import GHC.Types.Name.Reader
import GHC.Types.Fixity.Env
import GHC.Types.Id as Id
import GHC.Types.Id.Info( IdDetails(..) )
import GHC.Types.Var.Env
import GHC.Types.TypeEnv
import GHC.Types.Unique.FM
import GHC.Types.Name
import GHC.Types.Name.Env
import GHC.Types.Name.Set
import GHC.Types.Avail
import GHC.Types.Basic hiding( SuccessFlag(..) )
import GHC.Types.Annotations
import GHC.Types.SrcLoc
import GHC.Types.SourceText
import GHC.Types.SourceFile
import GHC.Types.TyThing.Ppr ( pprTyThingInContext )
import qualified GHC.LanguageExtensions as LangExt

import GHC.Unit.External
import GHC.Unit.Types
import GHC.Unit.State
import GHC.Unit.Home
import GHC.Unit.Module
import GHC.Unit.Module.Warnings
import GHC.Unit.Module.ModSummary
import GHC.Unit.Module.ModIface
import GHC.Unit.Module.ModDetails
import GHC.Unit.Module.Deps

import GHC.Data.FastString
import GHC.Data.Maybe
import GHC.Data.List.SetOps
import GHC.Data.Bag
import qualified GHC.Data.BooleanFormula as BF

import Data.List ( sortBy, sort )
import Data.Ord
import Data.Data ( Data )
import qualified Data.Set as S
import Control.DeepSeq
import Control.Monad

#include "HsVersions.h"

{-
************************************************************************
*                                                                      *
        Typecheck and rename a module
*                                                                      *
************************************************************************
-}

-- | Top level entry point for typechecker and renamer
tcRnModule :: HscEnv
           -> ModSummary
           -> Bool              -- True <=> save renamed syntax
           -> HsParsedModule
           -> IO (Messages DecoratedSDoc, Maybe TcGblEnv)

tcRnModule :: HscEnv
-> ModSummary
-> Bool
-> HsParsedModule
-> IO (Messages DecoratedSDoc, Maybe TcGblEnv)
tcRnModule HscEnv
hsc_env ModSummary
mod_sum Bool
save_rn_syntax
   parsedModule :: HsParsedModule
parsedModule@HsParsedModule {hpm_module :: HsParsedModule -> Located HsModule
hpm_module= L SrcSpan
loc HsModule
this_module}
 | RealSrcSpan RealSrcSpan
real_loc Maybe BufSpan
_ <- SrcSpan
loc
 = forall (m :: * -> *) a.
MonadIO m =>
Logger -> DynFlags -> SDoc -> (a -> ()) -> m a -> m a
withTiming Logger
logger DynFlags
dflags
              (String -> SDoc
text String
"Renamer/typechecker"SDoc -> SDoc -> SDoc
<+>SDoc -> SDoc
brackets (forall a. Outputable a => a -> SDoc
ppr Module
this_mod))
              (forall a b. a -> b -> a
const ()) forall a b. (a -> b) -> a -> b
$
   forall r.
HscEnv
-> HscSource
-> Bool
-> Module
-> RealSrcSpan
-> TcM r
-> IO (Messages DecoratedSDoc, Maybe r)
initTc HscEnv
hsc_env HscSource
hsc_src Bool
save_rn_syntax Module
this_mod RealSrcSpan
real_loc forall a b. (a -> b) -> a -> b
$
          forall a. HscEnv -> TcM a -> TcM a
withTcPlugins HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$ forall a. HscEnv -> TcM a -> TcM a
withHoleFitPlugins HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$

          HscEnv
-> ModSummary
-> HsParsedModule
-> (Module, SrcSpan)
-> TcM TcGblEnv
tcRnModuleTcRnM HscEnv
hsc_env ModSummary
mod_sum HsParsedModule
parsedModule (Module, SrcSpan)
pair

  | Bool
otherwise
  = forall (m :: * -> *) a. Monad m => a -> m a
return (MsgEnvelope DecoratedSDoc
err_msg forall e. MsgEnvelope e -> Messages e -> Messages e
`addMessage` forall e. Messages e
emptyMessages, forall a. Maybe a
Nothing)

  where
    hsc_src :: HscSource
hsc_src = ModSummary -> HscSource
ms_hsc_src ModSummary
mod_sum
    dflags :: DynFlags
dflags  = HscEnv -> DynFlags
hsc_dflags HscEnv
hsc_env
    logger :: Logger
logger  = HscEnv -> Logger
hsc_logger HscEnv
hsc_env
    home_unit :: HomeUnit
home_unit = HscEnv -> HomeUnit
hsc_home_unit HscEnv
hsc_env
    err_msg :: MsgEnvelope DecoratedSDoc
err_msg = SrcSpan -> SDoc -> MsgEnvelope DecoratedSDoc
mkPlainMsgEnvelope SrcSpan
loc forall a b. (a -> b) -> a -> b
$
              String -> SDoc
text String
"Module does not have a RealSrcSpan:" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr Module
this_mod

    pair :: (Module, SrcSpan)
    pair :: (Module, SrcSpan)
pair@(Module
this_mod,SrcSpan
_)
      | Just (L SrcSpanAnnA
mod_loc ModuleName
mod) <- HsModule -> Maybe (GenLocated SrcSpanAnnA ModuleName)
hsmodName HsModule
this_module
      = (HomeUnit -> ModuleName -> Module
mkHomeModule HomeUnit
home_unit ModuleName
mod, forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
mod_loc)

      | Bool
otherwise   -- 'module M where' is omitted
      = (HomeUnit -> ModuleName -> Module
mkHomeModule HomeUnit
home_unit ModuleName
mAIN_NAME, SrcLoc -> SrcSpan
srcLocSpan (SrcSpan -> SrcLoc
srcSpanStart SrcSpan
loc))




tcRnModuleTcRnM :: HscEnv
                -> ModSummary
                -> HsParsedModule
                -> (Module, SrcSpan)
                -> TcRn TcGblEnv
-- Factored out separately from tcRnModule so that a Core plugin can
-- call the type checker directly
tcRnModuleTcRnM :: HscEnv
-> ModSummary
-> HsParsedModule
-> (Module, SrcSpan)
-> TcM TcGblEnv
tcRnModuleTcRnM HscEnv
hsc_env ModSummary
mod_sum
                (HsParsedModule {
                   hpm_module :: HsParsedModule -> Located HsModule
hpm_module =
                      (L SrcSpan
loc (HsModule EpAnn AnnsModule
_ LayoutInfo
_ Maybe (GenLocated SrcSpanAnnA ModuleName)
maybe_mod Maybe (LocatedL [LIE GhcPs])
export_ies
                                       [LImportDecl GhcPs]
import_decls [LHsDecl GhcPs]
local_decls Maybe (LocatedP WarningTxt)
mod_deprec
                                       Maybe LHsDocString
maybe_doc_hdr)),
                   hpm_src_files :: HsParsedModule -> [String]
hpm_src_files = [String]
src_files
                })
                (Module
this_mod, SrcSpan
prel_imp_loc)
 = forall a. SrcSpan -> TcRn a -> TcRn a
setSrcSpan SrcSpan
loc forall a b. (a -> b) -> a -> b
$
   do { let { explicit_mod_hdr :: Bool
explicit_mod_hdr = forall a. Maybe a -> Bool
isJust Maybe (GenLocated SrcSpanAnnA ModuleName)
maybe_mod
            ; hsc_src :: HscSource
hsc_src          = ModSummary -> HscSource
ms_hsc_src ModSummary
mod_sum }
      ; -- Load the hi-boot interface for this module, if any
        -- We do this now so that the boot_names can be passed
        -- to tcTyAndClassDecls, because the boot_names are
        -- automatically considered to be loop breakers
        TcGblEnv
tcg_env <- forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
      ; SelfBootInfo
boot_info <- HscSource -> Module -> TcRn SelfBootInfo
tcHiBootIface HscSource
hsc_src Module
this_mod
      ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv (TcGblEnv
tcg_env { tcg_self_boot :: SelfBootInfo
tcg_self_boot = SelfBootInfo
boot_info })
        forall a b. (a -> b) -> a -> b
$ do
        { -- Deal with imports; first add implicit prelude
          Bool
implicit_prelude <- forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
xoptM Extension
LangExt.ImplicitPrelude
        ; let { prel_imports :: [LImportDecl GhcPs]
prel_imports = ModuleName
-> SrcSpan -> Bool -> [LImportDecl GhcPs] -> [LImportDecl GhcPs]
mkPrelImports (forall unit. GenModule unit -> ModuleName
moduleName Module
this_mod) SrcSpan
prel_imp_loc
                               Bool
implicit_prelude [LImportDecl GhcPs]
import_decls }

        ; forall gbl lcl.
WarningFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
whenWOptM WarningFlag
Opt_WarnImplicitPrelude forall a b. (a -> b) -> a -> b
$
             forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (forall (f :: * -> *) a. Foldable f => f a -> Bool
notNull [LImportDecl GhcPs]
prel_imports) forall a b. (a -> b) -> a -> b
$
                WarnReason -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addWarn (WarningFlag -> WarnReason
Reason WarningFlag
Opt_WarnImplicitPrelude) (SDoc
implicitPreludeWarn)

        ; -- TODO This is a little skeevy; maybe handle a bit more directly
          let { simplifyImport :: GenLocated l (ImportDecl pass)
-> (Maybe FastString, Located ModuleName)
simplifyImport (L l
_ ImportDecl pass
idecl) =
                  ( forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap StringLiteral -> FastString
sl_fs (forall pass. ImportDecl pass -> Maybe StringLiteral
ideclPkgQual ImportDecl pass
idecl) , forall a e. LocatedAn a e -> Located e
reLoc forall a b. (a -> b) -> a -> b
$ forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName ImportDecl pass
idecl)
              }
        ; [(Maybe FastString, Located ModuleName)]
raw_sig_imports <- forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO
                             forall a b. (a -> b) -> a -> b
$ HscEnv
-> HscSource
-> ModuleName
-> IO [(Maybe FastString, Located ModuleName)]
findExtraSigImports HscEnv
hsc_env HscSource
hsc_src
                                 (forall unit. GenModule unit -> ModuleName
moduleName Module
this_mod)
        ; [(Maybe FastString, Located ModuleName)]
raw_req_imports <- forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO
                             forall a b. (a -> b) -> a -> b
$ HscEnv
-> [(Maybe FastString, Located ModuleName)]
-> IO [(Maybe FastString, Located ModuleName)]
implicitRequirements HscEnv
hsc_env
                                (forall a b. (a -> b) -> [a] -> [b]
map forall {pass} {a} {l}.
(XRec pass ModuleName ~ GenLocated (SrcAnn a) ModuleName) =>
GenLocated l (ImportDecl pass)
-> (Maybe FastString, Located ModuleName)
simplifyImport ([LImportDecl GhcPs]
prel_imports
                                                     forall a. [a] -> [a] -> [a]
++ [LImportDecl GhcPs]
import_decls))
        ; let { mkImport :: (Maybe a, GenLocated l ModuleName)
-> LocatedAn an (ImportDecl GhcPs)
mkImport (Maybe a
Nothing, L l
_ ModuleName
mod_name) = forall a an. a -> LocatedAn an a
noLocA
                forall a b. (a -> b) -> a -> b
$ (ModuleName -> ImportDecl GhcPs
simpleImportDecl ModuleName
mod_name)
                  { ideclHiding :: Maybe (Bool, XRec GhcPs [LIE GhcPs])
ideclHiding = forall a. a -> Maybe a
Just (Bool
False, forall a an. a -> LocatedAn an a
noLocA [])}
              ; mkImport (Maybe a, GenLocated l ModuleName)
_ = forall a. String -> a
panic String
"mkImport" }
        ; let { all_imports :: [GenLocated SrcSpanAnnA (ImportDecl GhcPs)]
all_imports = [LImportDecl GhcPs]
prel_imports forall a. [a] -> [a] -> [a]
++ [LImportDecl GhcPs]
import_decls
                       forall a. [a] -> [a] -> [a]
++ forall a b. (a -> b) -> [a] -> [b]
map forall {a} {l} {an}.
(Maybe a, GenLocated l ModuleName)
-> LocatedAn an (ImportDecl GhcPs)
mkImport ([(Maybe FastString, Located ModuleName)]
raw_sig_imports forall a. [a] -> [a] -> [a]
++ [(Maybe FastString, Located ModuleName)]
raw_req_imports) }
        ; -- OK now finally rename the imports
          TcGblEnv
tcg_env <- {-# SCC "tcRnImports" #-}
                     HscEnv -> [LImportDecl GhcPs] -> TcM TcGblEnv
tcRnImports HscEnv
hsc_env [GenLocated SrcSpanAnnA (ImportDecl GhcPs)]
all_imports

       ;  -- Don't need to rename the Haddock documentation,
          -- it's not parsed by GHC anymore.
          -- Make sure to do this before 'tcRnSrcDecls', because we need the
          -- module header when we're splicing TH, since it can be accessed via
          -- 'getDoc'.
          TcGblEnv
tcg_env <- forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env
                              { tcg_doc_hdr :: Maybe LHsDocString
tcg_doc_hdr = Maybe LHsDocString
maybe_doc_hdr })

        ; -- If the whole module is warned about or deprecated
          -- (via mod_deprec) record that in tcg_warns. If we do thereby add
          -- a WarnAll, it will override any subsequent deprecations added to tcg_warns
          let { tcg_env1 :: TcGblEnv
tcg_env1 = case Maybe (LocatedP WarningTxt)
mod_deprec of
                             Just (L SrcSpanAnnP
_ WarningTxt
txt) ->
                               TcGblEnv
tcg_env {tcg_warns :: Warnings
tcg_warns = WarningTxt -> Warnings
WarnAll WarningTxt
txt}
                             Maybe (LocatedP WarningTxt)
Nothing            -> TcGblEnv
tcg_env
              }
        ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env1
          forall a b. (a -> b) -> a -> b
$ do { -- Rename and type check the declarations
                 String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn1a" SDoc
empty
               ; TcGblEnv
tcg_env <- if HscSource -> Bool
isHsBootOrSig HscSource
hsc_src
                            then do {
                              ; TcGblEnv
tcg_env <- HscSource -> [LHsDecl GhcPs] -> TcM TcGblEnv
tcRnHsBootDecls HscSource
hsc_src [LHsDecl GhcPs]
local_decls
                              ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn4a: before exports" SDoc
empty
                              ; TcGblEnv
tcg_env <- forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env forall a b. (a -> b) -> a -> b
$
                                           Bool -> Maybe (LocatedL [LIE GhcPs]) -> TcM TcGblEnv
rnExports Bool
explicit_mod_hdr Maybe (LocatedL [LIE GhcPs])
export_ies
                              ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn4b: after exports" SDoc
empty
                              ; forall (m :: * -> *) a. Monad m => a -> m a
return TcGblEnv
tcg_env
                              }
                            else {-# SCC "tcRnSrcDecls" #-}
                                 Bool
-> Maybe (LocatedL [LIE GhcPs]) -> [LHsDecl GhcPs] -> TcM TcGblEnv
tcRnSrcDecls Bool
explicit_mod_hdr Maybe (LocatedL [LIE GhcPs])
export_ies [LHsDecl GhcPs]
local_decls

               ; forall (m :: * -> *). Monad m => m Bool -> m () -> m ()
whenM (forall gbl lcl. GeneralFlag -> TcRnIf gbl lcl Bool
goptM GeneralFlag
Opt_DoCoreLinting) forall a b. (a -> b) -> a -> b
$
                 Logger -> DynFlags -> TcGblEnv -> TcRnIf TcGblEnv TcLclEnv ()
lintGblEnv (HscEnv -> Logger
hsc_logger HscEnv
hsc_env) (HscEnv -> DynFlags
hsc_dflags HscEnv
hsc_env) TcGblEnv
tcg_env

               ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env
                 forall a b. (a -> b) -> a -> b
$ do { -- Compare hi-boot iface (if any) with the real thing
                        -- Must be done after processing the exports
                        TcGblEnv
tcg_env <- TcGblEnv -> SelfBootInfo -> TcM TcGblEnv
checkHiBootIface TcGblEnv
tcg_env SelfBootInfo
boot_info
                      ; -- The new type env is already available to stuff
                        -- slurped from interface files, via
                        -- GHC.Tc.Utils.Env.setGlobalTypeEnv. It's important that this
                        -- includes the stuff in checkHiBootIface,
                        -- because the latter might add new bindings for
                        -- boot_dfuns, which may be mentioned in imported
                        -- unfoldings.
                        -- Report unused names
                        -- Do this /after/ typeinference, so that when reporting
                        -- a function with no type signature we can give the
                        -- inferred type
                        TcGblEnv -> HscSource -> TcRnIf TcGblEnv TcLclEnv ()
reportUnusedNames TcGblEnv
tcg_env HscSource
hsc_src
                      ; -- add extra source files to tcg_dependent_files
                        [String] -> TcRnIf TcGblEnv TcLclEnv ()
addDependentFiles [String]
src_files
                        -- Ensure plugins run with the same tcg_env that we pass in
                      ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env
                        forall a b. (a -> b) -> a -> b
$ do { TcGblEnv
tcg_env <- ModSummary -> TcGblEnv -> TcM TcGblEnv
runTypecheckerPlugin ModSummary
mod_sum TcGblEnv
tcg_env
                             ; -- Dump output and return
                               TcGblEnv -> TcRnIf TcGblEnv TcLclEnv ()
tcDump TcGblEnv
tcg_env
                             ; forall (m :: * -> *) a. Monad m => a -> m a
return TcGblEnv
tcg_env
                             }
                      }
               }
        }
      }

implicitPreludeWarn :: SDoc
implicitPreludeWarn :: SDoc
implicitPreludeWarn
  = String -> SDoc
text String
"Module `Prelude' implicitly imported"

{-
************************************************************************
*                                                                      *
                Import declarations
*                                                                      *
************************************************************************
-}

tcRnImports :: HscEnv -> [LImportDecl GhcPs] -> TcM TcGblEnv
tcRnImports :: HscEnv -> [LImportDecl GhcPs] -> TcM TcGblEnv
tcRnImports HscEnv
hsc_env [LImportDecl GhcPs]
import_decls
  = do  { ([GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Renamed))]
rn_imports, GlobalRdrEnv
rdr_env, ImportAvails
imports, Bool
hpc_info) <- [LImportDecl GhcPs]
-> RnM
     ([LImportDecl (GhcPass 'Renamed)], GlobalRdrEnv, ImportAvails,
      Bool)
rnImports [LImportDecl GhcPs]
import_decls ;

        ; Module
this_mod <- forall (m :: * -> *). HasModule m => m Module
getModule
        ; let { dep_mods :: ModuleNameEnv ModuleNameWithIsBoot
              ; dep_mods :: ModuleNameEnv ModuleNameWithIsBoot
dep_mods = ImportAvails -> ModuleNameEnv ModuleNameWithIsBoot
imp_dep_mods ImportAvails
imports

                -- We want instance declarations from all home-package
                -- modules below this one, including boot modules, except
                -- ourselves.  The 'except ourselves' is so that we don't
                -- get the instances from this module's hs-boot file.  This
                -- filtering also ensures that we don't see instances from
                -- modules batch (@--make@) compiled before this one, but
                -- which are not below this one.
              ; want_instances :: ModuleName -> Bool
              ; want_instances :: ModuleName -> Bool
want_instances ModuleName
mod = ModuleName
mod forall key elt. Uniquable key => key -> UniqFM key elt -> Bool
`elemUFM` ModuleNameEnv ModuleNameWithIsBoot
dep_mods
                                   Bool -> Bool -> Bool
&& ModuleName
mod forall a. Eq a => a -> a -> Bool
/= forall unit. GenModule unit -> ModuleName
moduleName Module
this_mod
              ; ([ClsInst]
home_insts, [FamInst]
home_fam_insts) = HscEnv -> (ModuleName -> Bool) -> ([ClsInst], [FamInst])
hptInstances HscEnv
hsc_env
                                                            ModuleName -> Bool
want_instances
              } ;

                -- Record boot-file info in the EPS, so that it's
                -- visible to loadHiBootInterface in tcRnSrcDecls,
                -- and any other incrementally-performed imports
        ; forall gbl lcl.
(ExternalPackageState -> ExternalPackageState) -> TcRnIf gbl lcl ()
updateEps_ (\ExternalPackageState
eps -> ExternalPackageState
eps { eps_is_boot :: ModuleNameEnv ModuleNameWithIsBoot
eps_is_boot = ModuleNameEnv ModuleNameWithIsBoot
dep_mods }) ;

                -- Update the gbl env
        ; forall gbl lcl a.
(gbl -> gbl) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updGblEnv ( \ TcGblEnv
gbl ->
            TcGblEnv
gbl {
              tcg_rdr_env :: GlobalRdrEnv
tcg_rdr_env      = TcGblEnv -> GlobalRdrEnv
tcg_rdr_env TcGblEnv
gbl GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
`plusGlobalRdrEnv` GlobalRdrEnv
rdr_env,
              tcg_imports :: ImportAvails
tcg_imports      = TcGblEnv -> ImportAvails
tcg_imports TcGblEnv
gbl ImportAvails -> ImportAvails -> ImportAvails
`plusImportAvails` ImportAvails
imports,
              tcg_rn_imports :: [LImportDecl (GhcPass 'Renamed)]
tcg_rn_imports   = [GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Renamed))]
rn_imports,
              tcg_inst_env :: InstEnv
tcg_inst_env     = InstEnv -> [ClsInst] -> InstEnv
extendInstEnvList (TcGblEnv -> InstEnv
tcg_inst_env TcGblEnv
gbl) [ClsInst]
home_insts,
              tcg_fam_inst_env :: FamInstEnv
tcg_fam_inst_env = FamInstEnv -> [FamInst] -> FamInstEnv
extendFamInstEnvList (TcGblEnv -> FamInstEnv
tcg_fam_inst_env TcGblEnv
gbl)
                                                      [FamInst]
home_fam_insts,
              tcg_hpc :: Bool
tcg_hpc          = Bool
hpc_info
            }) forall a b. (a -> b) -> a -> b
$ do {

        ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn1" (forall a. Outputable a => a -> SDoc
ppr (ImportAvails -> ModuleNameEnv ModuleNameWithIsBoot
imp_dep_mods ImportAvails
imports))
                -- Fail if there are any errors so far
                -- The error printing (if needed) takes advantage
                -- of the tcg_env we have now set
--      ; traceIf (text "rdr_env: " <+> ppr rdr_env)
        ; TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM

                -- Load any orphan-module (including orphan family
                -- instance-module) interfaces, so that their rules and
                -- instance decls will be found.  But filter out a
                -- self hs-boot: these instances will be checked when
                -- we define them locally.
                -- (We don't need to load non-orphan family instance
                -- modules until we either try to use the instances they
                -- define, or define our own family instances, at which
                -- point we need to check them for consistency.)
        ; SDoc -> [Module] -> TcRnIf TcGblEnv TcLclEnv ()
loadModuleInterfaces (String -> SDoc
text String
"Loading orphan modules")
                               (forall a. (a -> Bool) -> [a] -> [a]
filter (forall a. Eq a => a -> a -> Bool
/= Module
this_mod) (ImportAvails -> [Module]
imp_orphs ImportAvails
imports))

                -- Check type-family consistency between imports.
                -- See Note [The type family instance consistency story]
        ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn1: checking family instance consistency {" SDoc
empty
        ; let { dir_imp_mods :: [Module]
dir_imp_mods = forall a. ModuleEnv a -> [Module]
moduleEnvKeys
                             forall b c a. (b -> c) -> (a -> b) -> a -> c
. ImportAvails -> ImportedMods
imp_mods
                             forall a b. (a -> b) -> a -> b
$ ImportAvails
imports }
        ; [Module] -> TcRnIf TcGblEnv TcLclEnv ()
checkFamInstConsistency [Module]
dir_imp_mods
        ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn1: } checking family instance consistency" SDoc
empty

        ; forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv } }

{-
************************************************************************
*                                                                      *
        Type-checking the top level of a module
*                                                                      *
************************************************************************
-}

tcRnSrcDecls :: Bool  -- False => no 'module M(..) where' header at all
             -> Maybe (LocatedL [LIE GhcPs])
             -> [LHsDecl GhcPs]               -- Declarations
             -> TcM TcGblEnv
tcRnSrcDecls :: Bool
-> Maybe (LocatedL [LIE GhcPs]) -> [LHsDecl GhcPs] -> TcM TcGblEnv
tcRnSrcDecls Bool
explicit_mod_hdr Maybe (LocatedL [LIE GhcPs])
export_ies [LHsDecl GhcPs]
decls
 = do { -- Do all the declarations
      ; (TcGblEnv
tcg_env, TcLclEnv
tcl_env, WantedConstraints
lie) <- [LHsDecl GhcPs] -> TcM (TcGblEnv, TcLclEnv, WantedConstraints)
tc_rn_src_decls [LHsDecl GhcPs]
decls

      ------ Simplify constraints ---------
      --
      -- We do this after checkMainType, so that we use the type
      -- info that checkMainType adds
      --
      -- We do it with both global and local env in scope:
      --  * the global env exposes the instances to simplifyTop,
      --    and affects how names are rendered in error messages
      --  * the local env exposes the local Ids to simplifyTop,
      --    so that we get better error messages (monomorphism restriction)
      ; Bag EvBind
new_ev_binds <- {-# SCC "simplifyTop" #-}
                        forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv
tcg_env, TcLclEnv
tcl_env) forall a b. (a -> b) -> a -> b
$
                        do { WantedConstraints
lie_main <- TcGblEnv -> TcRn WantedConstraints
checkMainType TcGblEnv
tcg_env
                           ; WantedConstraints -> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
simplifyTop (WantedConstraints
lie WantedConstraints -> WantedConstraints -> WantedConstraints
`andWC` WantedConstraints
lie_main) }

        -- Emit Typeable bindings
      ; TcGblEnv
tcg_env <- forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env forall a b. (a -> b) -> a -> b
$
                   TcM TcGblEnv
mkTypeableBinds

      ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc9" SDoc
empty

        -- Zonk the final code.  This must be done last.
        -- Even simplifyTop may do some unification.
        -- This pass also warns about missing type signatures
      ; (TypeEnv
id_env, Bag EvBind
ev_binds', Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
binds', [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
fords', [LTcSpecPrag]
imp_specs', [GenLocated SrcSpanAnnA (RuleDecl GhcTc)]
rules')
            <- Bag EvBind
-> TcGblEnv
-> TcM
     (TypeEnv, Bag EvBind, LHsBinds GhcTc, [LForeignDecl GhcTc],
      [LTcSpecPrag], [LRuleDecl GhcTc])
zonkTcGblEnv Bag EvBind
new_ev_binds TcGblEnv
tcg_env

      --------- Run finalizers --------------
      -- Finalizers must run after constraints are simplified, lest types
      --    might not be complete when using reify (see #12777).
      -- and also after we zonk the first time because we run typed splices
      --    in the zonker which gives rise to the finalisers.
      ; let -- init_tcg_env:
            --   * Remove accumulated bindings, rules and so on from
            --     TcGblEnv.  They are now in ev_binds', binds', etc.
            --   * Add the zonked Ids from the value bindings to tcg_type_env
            --     Up to now these Ids are only in tcl_env's type-envt
            init_tcg_env :: TcGblEnv
init_tcg_env = TcGblEnv
tcg_env { tcg_binds :: LHsBinds GhcTc
tcg_binds     = forall a. Bag a
emptyBag
                                   , tcg_ev_binds :: Bag EvBind
tcg_ev_binds  = forall a. Bag a
emptyBag
                                   , tcg_imp_specs :: [LTcSpecPrag]
tcg_imp_specs = []
                                   , tcg_rules :: [LRuleDecl GhcTc]
tcg_rules     = []
                                   , tcg_fords :: [LForeignDecl GhcTc]
tcg_fords     = []
                                   , tcg_type_env :: TypeEnv
tcg_type_env  = TcGblEnv -> TypeEnv
tcg_type_env TcGblEnv
tcg_env
                                                     TypeEnv -> TypeEnv -> TypeEnv
`plusTypeEnv` TypeEnv
id_env }
      ; (TcGblEnv
tcg_env, TcLclEnv
tcl_env) <- forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
init_tcg_env
                              TcM (TcGblEnv, TcLclEnv)
run_th_modfinalizers
      ; TcRnIf TcGblEnv TcLclEnv ()
finishTH
      ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc11" SDoc
empty

      --------- Deal with the exports ----------
      -- Can't be done earlier, because the export list must "see"
      -- the declarations created by the finalizers
      ; TcGblEnv
tcg_env <- forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv
tcg_env, TcLclEnv
tcl_env) forall a b. (a -> b) -> a -> b
$
                   Bool -> Maybe (LocatedL [LIE GhcPs]) -> TcM TcGblEnv
rnExports Bool
explicit_mod_hdr Maybe (LocatedL [LIE GhcPs])
export_ies

      --------- Emit the ':Main.main = runMainIO main' declaration ----------
      -- Do this /after/ rnExports, so that it can consult
      -- the tcg_exports created by rnExports
      ; (TcGblEnv
tcg_env, Bag EvBind
main_ev_binds)
           <- forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv
tcg_env, TcLclEnv
tcl_env) forall a b. (a -> b) -> a -> b
$
              do { (TcGblEnv
tcg_env, WantedConstraints
lie) <- forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints forall a b. (a -> b) -> a -> b
$
                                     Bool -> Maybe (LocatedL [LIE GhcPs]) -> TcM TcGblEnv
checkMain Bool
explicit_mod_hdr Maybe (LocatedL [LIE GhcPs])
export_ies
                 ; Bag EvBind
ev_binds <- WantedConstraints -> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
simplifyTop WantedConstraints
lie
                 ; forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env, Bag EvBind
ev_binds) }

      ---------- Final zonking ---------------
      -- Zonk the new bindings arising from running the finalisers,
      -- and main. This won't give rise to any more finalisers as you
      -- can't nest finalisers inside finalisers.
      ; (TypeEnv
id_env_mf, Bag EvBind
ev_binds_mf, Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
binds_mf, [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
fords_mf, [LTcSpecPrag]
imp_specs_mf, [GenLocated SrcSpanAnnA (RuleDecl GhcTc)]
rules_mf)
            <- Bag EvBind
-> TcGblEnv
-> TcM
     (TypeEnv, Bag EvBind, LHsBinds GhcTc, [LForeignDecl GhcTc],
      [LTcSpecPrag], [LRuleDecl GhcTc])
zonkTcGblEnv Bag EvBind
main_ev_binds TcGblEnv
tcg_env

      ; let { !final_type_env :: TypeEnv
final_type_env = TcGblEnv -> TypeEnv
tcg_type_env TcGblEnv
tcg_env
                                TypeEnv -> TypeEnv -> TypeEnv
`plusTypeEnv` TypeEnv
id_env_mf
              -- Add the zonked Ids from the value bindings (they were in tcl_env)
              -- Force !final_type_env, lest we retain an old reference
              -- to the previous tcg_env

            ; tcg_env' :: TcGblEnv
tcg_env' = TcGblEnv
tcg_env
                          { tcg_binds :: LHsBinds GhcTc
tcg_binds     = Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
binds'    forall a. Bag a -> Bag a -> Bag a
`unionBags` Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
binds_mf
                          , tcg_ev_binds :: Bag EvBind
tcg_ev_binds  = Bag EvBind
ev_binds' forall a. Bag a -> Bag a -> Bag a
`unionBags` Bag EvBind
ev_binds_mf
                          , tcg_imp_specs :: [LTcSpecPrag]
tcg_imp_specs = [LTcSpecPrag]
imp_specs' forall a. [a] -> [a] -> [a]
++ [LTcSpecPrag]
imp_specs_mf
                          , tcg_rules :: [LRuleDecl GhcTc]
tcg_rules     = [GenLocated SrcSpanAnnA (RuleDecl GhcTc)]
rules'     forall a. [a] -> [a] -> [a]
++ [GenLocated SrcSpanAnnA (RuleDecl GhcTc)]
rules_mf
                          , tcg_fords :: [LForeignDecl GhcTc]
tcg_fords     = [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
fords'     forall a. [a] -> [a] -> [a]
++ [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
fords_mf } } ;

      ; TcGblEnv -> TypeEnv -> TcM TcGblEnv
setGlobalTypeEnv TcGblEnv
tcg_env' TypeEnv
final_type_env
   }

zonkTcGblEnv :: Bag EvBind -> TcGblEnv
             -> TcM (TypeEnv, Bag EvBind, LHsBinds GhcTc,
                       [LForeignDecl GhcTc], [LTcSpecPrag], [LRuleDecl GhcTc])
zonkTcGblEnv :: Bag EvBind
-> TcGblEnv
-> TcM
     (TypeEnv, Bag EvBind, LHsBinds GhcTc, [LForeignDecl GhcTc],
      [LTcSpecPrag], [LRuleDecl GhcTc])
zonkTcGblEnv Bag EvBind
ev_binds tcg_env :: TcGblEnv
tcg_env@(TcGblEnv { tcg_binds :: TcGblEnv -> LHsBinds GhcTc
tcg_binds     = LHsBinds GhcTc
binds
                                        , tcg_ev_binds :: TcGblEnv -> Bag EvBind
tcg_ev_binds  = Bag EvBind
cur_ev_binds
                                        , tcg_imp_specs :: TcGblEnv -> [LTcSpecPrag]
tcg_imp_specs = [LTcSpecPrag]
imp_specs
                                        , tcg_rules :: TcGblEnv -> [LRuleDecl GhcTc]
tcg_rules     = [LRuleDecl GhcTc]
rules
                                        , tcg_fords :: TcGblEnv -> [LForeignDecl GhcTc]
tcg_fords     = [LForeignDecl GhcTc]
fords })
  = {-# SCC "zonkTopDecls" #-}
    forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env forall a b. (a -> b) -> a -> b
$ -- This sets the GlobalRdrEnv which is used when rendering
                        --   error messages during zonking (notably levity errors)
    do { TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM    -- Don't zonk if there have been errors
                        -- It's a waste of time; and we may get debug warnings
                        -- about strangely-typed TyCons!
       ; let all_ev_binds :: Bag EvBind
all_ev_binds = Bag EvBind
cur_ev_binds forall a. Bag a -> Bag a -> Bag a
`unionBags` Bag EvBind
ev_binds
       ; Bag EvBind
-> LHsBinds GhcTc
-> [LRuleDecl GhcTc]
-> [LTcSpecPrag]
-> [LForeignDecl GhcTc]
-> TcM
     (TypeEnv, Bag EvBind, LHsBinds GhcTc, [LForeignDecl GhcTc],
      [LTcSpecPrag], [LRuleDecl GhcTc])
zonkTopDecls Bag EvBind
all_ev_binds LHsBinds GhcTc
binds [LRuleDecl GhcTc]
rules [LTcSpecPrag]
imp_specs [LForeignDecl GhcTc]
fords }

-- | Runs TH finalizers and renames and typechecks the top-level declarations
-- that they could introduce.
run_th_modfinalizers :: TcM (TcGblEnv, TcLclEnv)
run_th_modfinalizers :: TcM (TcGblEnv, TcLclEnv)
run_th_modfinalizers = do
  TcRef [(TcLclEnv, ThModFinalizers)]
th_modfinalizers_var <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap TcGblEnv -> TcRef [(TcLclEnv, ThModFinalizers)]
tcg_th_modfinalizers forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
  [(TcLclEnv, ThModFinalizers)]
th_modfinalizers <- forall a gbl lcl. TcRef a -> TcRnIf gbl lcl a
readTcRef TcRef [(TcLclEnv, ThModFinalizers)]
th_modfinalizers_var
  if forall (t :: * -> *) a. Foldable t => t a -> Bool
null [(TcLclEnv, ThModFinalizers)]
th_modfinalizers
  then forall gbl lcl. TcRnIf gbl lcl (gbl, lcl)
getEnvs
  else do
    forall a gbl lcl. TcRef a -> a -> TcRnIf gbl lcl ()
writeTcRef TcRef [(TcLclEnv, ThModFinalizers)]
th_modfinalizers_var []
    let run_finalizer :: (TcLclEnv, ThModFinalizers) -> TcRnIf TcGblEnv lcl ()
run_finalizer (TcLclEnv
lcl_env, ThModFinalizers
f) =
            forall lcl' gbl a lcl.
lcl' -> TcRnIf gbl lcl' a -> TcRnIf gbl lcl a
setLclEnv TcLclEnv
lcl_env (ThModFinalizers -> TcRnIf TcGblEnv TcLclEnv ()
runRemoteModFinalizers ThModFinalizers
f)

    (()
_, WantedConstraints
lie_th) <- forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints forall a b. (a -> b) -> a -> b
$
                   forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ forall {lcl}. (TcLclEnv, ThModFinalizers) -> TcRnIf TcGblEnv lcl ()
run_finalizer [(TcLclEnv, ThModFinalizers)]
th_modfinalizers

      -- Finalizers can add top-level declarations with addTopDecls, so
      -- we have to run tc_rn_src_decls to get them
    (TcGblEnv
tcg_env, TcLclEnv
tcl_env, WantedConstraints
lie_top_decls) <- [LHsDecl GhcPs] -> TcM (TcGblEnv, TcLclEnv, WantedConstraints)
tc_rn_src_decls []

    forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv
tcg_env, TcLclEnv
tcl_env) forall a b. (a -> b) -> a -> b
$ do
      -- Subsequent rounds of finalizers run after any new constraints are
      -- simplified, or some types might not be complete when using reify
      -- (see #12777).
      Bag EvBind
new_ev_binds <- {-# SCC "simplifyTop2" #-}
                      WantedConstraints -> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
simplifyTop (WantedConstraints
lie_th WantedConstraints -> WantedConstraints -> WantedConstraints
`andWC` WantedConstraints
lie_top_decls)
      forall a. Bag EvBind -> TcM a -> TcM a
addTopEvBinds Bag EvBind
new_ev_binds TcM (TcGblEnv, TcLclEnv)
run_th_modfinalizers
        -- addTopDecls can add declarations which add new finalizers.

tc_rn_src_decls :: [LHsDecl GhcPs]
                -> TcM (TcGblEnv, TcLclEnv, WantedConstraints)
-- Loops around dealing with each top level inter-splice group
-- in turn, until it's dealt with the entire module
-- Never emits constraints; calls captureTopConstraints internally
tc_rn_src_decls :: [LHsDecl GhcPs] -> TcM (TcGblEnv, TcLclEnv, WantedConstraints)
tc_rn_src_decls [LHsDecl GhcPs]
ds
 = {-# SCC "tc_rn_src_decls" #-}
   do { (HsGroup GhcPs
first_group, Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
group_tail) <- [LHsDecl GhcPs]
-> RnM (HsGroup GhcPs, Maybe (SpliceDecl GhcPs, [LHsDecl GhcPs]))
findSplice [LHsDecl GhcPs]
ds
                -- If ds is [] we get ([], Nothing)

        -- Deal with decls up to, but not including, the first splice
      ; (TcGblEnv
tcg_env, HsGroup (GhcPass 'Renamed)
rn_decls) <- HsGroup GhcPs -> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
rnTopSrcDecls HsGroup GhcPs
first_group
                -- rnTopSrcDecls fails if there are any errors

        -- Get TH-generated top-level declarations and make sure they don't
        -- contain any splices since we don't handle that at the moment
        --
        -- The plumbing here is a bit odd: see #10853
      ; TcRef [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
th_topdecls_var <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap TcGblEnv -> TcRef [LHsDecl GhcPs]
tcg_th_topdecls forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
      ; [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
th_ds <- forall a gbl lcl. TcRef a -> TcRnIf gbl lcl a
readTcRef TcRef [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
th_topdecls_var
      ; forall a gbl lcl. TcRef a -> a -> TcRnIf gbl lcl ()
writeTcRef TcRef [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
th_topdecls_var []

      ; (TcGblEnv
tcg_env, HsGroup (GhcPass 'Renamed)
rn_decls) <-
            if forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
th_ds
            then forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env, HsGroup (GhcPass 'Renamed)
rn_decls)
            else do { (HsGroup GhcPs
th_group, Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
th_group_tail) <- [LHsDecl GhcPs]
-> RnM (HsGroup GhcPs, Maybe (SpliceDecl GhcPs, [LHsDecl GhcPs]))
findSplice [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
th_ds
                    ; case Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
th_group_tail of
                        { Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
Nothing -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
                        ; Just (SpliceDecl XSpliceDecl GhcPs
_ (L SrcSpanAnnA
loc HsSplice GhcPs
_) SpliceExplicitFlag
_, [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
_) ->
                            forall ann a. SrcSpanAnn' ann -> TcRn a -> TcRn a
setSrcSpanA SrcSpanAnnA
loc
                            forall a b. (a -> b) -> a -> b
$ SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErr (String -> SDoc
text
                                (String
"Declaration splices are not "
                                  forall a. [a] -> [a] -> [a]
++ String
"permitted inside top-level "
                                  forall a. [a] -> [a] -> [a]
++ String
"declarations added with addTopDecls"))
                        }
                      -- Rename TH-generated top-level declarations
                    ; (TcGblEnv
tcg_env, HsGroup (GhcPass 'Renamed)
th_rn_decls) <- forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env
                        forall a b. (a -> b) -> a -> b
$ HsGroup GhcPs -> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
rnTopSrcDecls HsGroup GhcPs
th_group

                      -- Dump generated top-level declarations
                    ; let msg :: String
msg = String
"top-level declarations added with addTopDecls"
                    ; SpliceInfo -> TcRnIf TcGblEnv TcLclEnv ()
traceSplice
                        forall a b. (a -> b) -> a -> b
$ SpliceInfo { spliceDescription :: String
spliceDescription = String
msg
                                     , spliceIsDecl :: Bool
spliceIsDecl    = Bool
True
                                     , spliceSource :: Maybe (LHsExpr (GhcPass 'Renamed))
spliceSource    = forall a. Maybe a
Nothing
                                     , spliceGenerated :: SDoc
spliceGenerated = forall a. Outputable a => a -> SDoc
ppr HsGroup (GhcPass 'Renamed)
th_rn_decls }
                    ; forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env, forall (p :: Pass).
HsGroup (GhcPass p) -> HsGroup (GhcPass p) -> HsGroup (GhcPass p)
appendGroups HsGroup (GhcPass 'Renamed)
rn_decls HsGroup (GhcPass 'Renamed)
th_rn_decls)
                    }

      -- Type check all declarations
      -- NB: set the env **before** captureTopConstraints so that error messages
      -- get reported w.r.t. the right GlobalRdrEnv. It is for this reason that
      -- the captureTopConstraints must go here, not in tcRnSrcDecls.
      ; ((TcGblEnv
tcg_env, TcLclEnv
tcl_env), WantedConstraints
lie1) <- forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env forall a b. (a -> b) -> a -> b
$
                                      forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints forall a b. (a -> b) -> a -> b
$
                                      HsGroup (GhcPass 'Renamed) -> TcM (TcGblEnv, TcLclEnv)
tcTopSrcDecls HsGroup (GhcPass 'Renamed)
rn_decls

        -- If there is no splice, we're nearly done
      ; forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv
tcg_env, TcLclEnv
tcl_env) forall a b. (a -> b) -> a -> b
$
        case Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
group_tail of
          { Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
Nothing -> forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env, TcLclEnv
tcl_env, WantedConstraints
lie1)

            -- If there's a splice, we must carry on
          ; Just (SpliceDecl XSpliceDecl GhcPs
_ (L SrcSpanAnnA
_ HsSplice GhcPs
splice) SpliceExplicitFlag
_, [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
rest_ds) ->
            do {
                 -- We need to simplify any constraints from the previous declaration
                 -- group, or else we might reify metavariables, as in #16980.
               ; Bag EvBind
ev_binds1 <- WantedConstraints -> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
simplifyTop WantedConstraints
lie1

                 -- Rename the splice expression, and get its supporting decls
               ; ([GenLocated SrcSpanAnnA (HsDecl GhcPs)]
spliced_decls, FreeVars
splice_fvs) <- HsSplice GhcPs -> RnM ([LHsDecl GhcPs], FreeVars)
rnTopSpliceDecls HsSplice GhcPs
splice

                 -- Glue them on the front of the remaining decls and loop
               ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv (TcGblEnv
tcg_env TcGblEnv -> DefUses -> TcGblEnv
`addTcgDUs` FreeVars -> DefUses
usesOnly FreeVars
splice_fvs) forall a b. (a -> b) -> a -> b
$
                 forall a. Bag EvBind -> TcM a -> TcM a
addTopEvBinds Bag EvBind
ev_binds1                             forall a b. (a -> b) -> a -> b
$
                 [LHsDecl GhcPs] -> TcM (TcGblEnv, TcLclEnv, WantedConstraints)
tc_rn_src_decls ([GenLocated SrcSpanAnnA (HsDecl GhcPs)]
spliced_decls forall a. [a] -> [a] -> [a]
++ [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
rest_ds)
               }
          }
      }

{-
************************************************************************
*                                                                      *
        Compiling hs-boot source files, and
        comparing the hi-boot interface with the real thing
*                                                                      *
************************************************************************
-}

tcRnHsBootDecls :: HscSource -> [LHsDecl GhcPs] -> TcM TcGblEnv
tcRnHsBootDecls :: HscSource -> [LHsDecl GhcPs] -> TcM TcGblEnv
tcRnHsBootDecls HscSource
hsc_src [LHsDecl GhcPs]
decls
   = do { (HsGroup GhcPs
first_group, Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
group_tail) <- [LHsDecl GhcPs]
-> RnM (HsGroup GhcPs, Maybe (SpliceDecl GhcPs, [LHsDecl GhcPs]))
findSplice [LHsDecl GhcPs]
decls

                -- Rename the declarations
        ; (TcGblEnv
tcg_env, HsGroup { hs_tyclds :: forall p. HsGroup p -> [TyClGroup p]
hs_tyclds = [TyClGroup (GhcPass 'Renamed)]
tycl_decls
                            , hs_derivds :: forall p. HsGroup p -> [LDerivDecl p]
hs_derivds = [LDerivDecl (GhcPass 'Renamed)]
deriv_decls
                            , hs_fords :: forall p. HsGroup p -> [LForeignDecl p]
hs_fords  = [LForeignDecl (GhcPass 'Renamed)]
for_decls
                            , hs_defds :: forall p. HsGroup p -> [LDefaultDecl p]
hs_defds  = [LDefaultDecl (GhcPass 'Renamed)]
def_decls
                            , hs_ruleds :: forall p. HsGroup p -> [LRuleDecls p]
hs_ruleds = [LRuleDecls (GhcPass 'Renamed)]
rule_decls
                            , hs_annds :: forall p. HsGroup p -> [LAnnDecl p]
hs_annds  = [LAnnDecl (GhcPass 'Renamed)]
_
                            , hs_valds :: forall p. HsGroup p -> HsValBinds p
hs_valds  = XValBindsLR (NValBinds [(RecFlag, LHsBinds (GhcPass 'Renamed))]
val_binds [LSig (GhcPass 'Renamed)]
val_sigs) })
              <- HsGroup GhcPs -> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
rnTopSrcDecls HsGroup GhcPs
first_group

        -- The empty list is for extra dependencies coming from .hs-boot files
        -- See Note [Extra dependencies from .hs-boot files] in GHC.Rename.Module

        ; (TcGblEnv
gbl_env, WantedConstraints
lie) <- forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env forall a b. (a -> b) -> a -> b
$ forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints forall a b. (a -> b) -> a -> b
$ do {
              -- NB: setGblEnv **before** captureTopConstraints so that
              -- if the latter reports errors, it knows what's in scope

                -- Check for illegal declarations
        ; case Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
group_tail of
             Just (SpliceDecl XSpliceDecl GhcPs
_ XRec GhcPs (HsSplice GhcPs)
d SpliceExplicitFlag
_, [GenLocated SrcSpanAnnA (HsDecl GhcPs)]
_) -> forall decl.
HscSource -> String -> LocatedA decl -> TcRnIf TcGblEnv TcLclEnv ()
badBootDecl HscSource
hsc_src String
"splice" XRec GhcPs (HsSplice GhcPs)
d
             Maybe (SpliceDecl GhcPs, [GenLocated SrcSpanAnnA (HsDecl GhcPs)])
Nothing                    -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
        ; forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (forall decl.
HscSource -> String -> LocatedA decl -> TcRnIf TcGblEnv TcLclEnv ()
badBootDecl HscSource
hsc_src String
"foreign") [LForeignDecl (GhcPass 'Renamed)]
for_decls
        ; forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (forall decl.
HscSource -> String -> LocatedA decl -> TcRnIf TcGblEnv TcLclEnv ()
badBootDecl HscSource
hsc_src String
"default") [LDefaultDecl (GhcPass 'Renamed)]
def_decls
        ; forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (forall decl.
HscSource -> String -> LocatedA decl -> TcRnIf TcGblEnv TcLclEnv ()
badBootDecl HscSource
hsc_src String
"rule")    [LRuleDecls (GhcPass 'Renamed)]
rule_decls

                -- Typecheck type/class/instance decls
        ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc2 (boot)" SDoc
empty
        ; (TcGblEnv
tcg_env, [InstInfo (GhcPass 'Renamed)]
inst_infos, HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed)
_deriv_binds)
             <- [TyClGroup (GhcPass 'Renamed)]
-> [LDerivDecl (GhcPass 'Renamed)]
-> [(RecFlag, LHsBinds (GhcPass 'Renamed))]
-> TcM
     (TcGblEnv, [InstInfo (GhcPass 'Renamed)],
      HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed))
tcTyClsInstDecls [TyClGroup (GhcPass 'Renamed)]
tycl_decls [LDerivDecl (GhcPass 'Renamed)]
deriv_decls [(RecFlag, LHsBinds (GhcPass 'Renamed))]
val_binds
        ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env     forall a b. (a -> b) -> a -> b
$ do {

        -- Emit Typeable bindings
        ; TcGblEnv
tcg_env <- TcM TcGblEnv
mkTypeableBinds
        ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env forall a b. (a -> b) -> a -> b
$ do {

                -- Typecheck value declarations
        ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc5" SDoc
empty
        ; [Var]
val_ids <- [(RecFlag, LHsBinds (GhcPass 'Renamed))]
-> [LSig (GhcPass 'Renamed)] -> TcM [Var]
tcHsBootSigs [(RecFlag, LHsBinds (GhcPass 'Renamed))]
val_binds [LSig (GhcPass 'Renamed)]
val_sigs

                -- Wrap up
                -- No simplification or zonking to do
        ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc7a" SDoc
empty
        ; TcGblEnv
gbl_env <- forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv

                -- Make the final type-env
                -- Include the dfun_ids so that their type sigs
                -- are written into the interface file.
        ; let { type_env0 :: TypeEnv
type_env0 = TcGblEnv -> TypeEnv
tcg_type_env TcGblEnv
gbl_env
              ; type_env1 :: TypeEnv
type_env1 = TypeEnv -> [Var] -> TypeEnv
extendTypeEnvWithIds TypeEnv
type_env0 [Var]
val_ids
              ; type_env2 :: TypeEnv
type_env2 = TypeEnv -> [Var] -> TypeEnv
extendTypeEnvWithIds TypeEnv
type_env1 [Var]
dfun_ids
              ; dfun_ids :: [Var]
dfun_ids = forall a b. (a -> b) -> [a] -> [b]
map forall a. InstInfo a -> Var
iDFunId [InstInfo (GhcPass 'Renamed)]
inst_infos
              }

        ; TcGblEnv -> TypeEnv -> TcM TcGblEnv
setGlobalTypeEnv TcGblEnv
gbl_env TypeEnv
type_env2
   }}}
   ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"boot" (forall a. Outputable a => a -> SDoc
ppr WantedConstraints
lie); forall (m :: * -> *) a. Monad m => a -> m a
return TcGblEnv
gbl_env }

badBootDecl :: HscSource -> String -> LocatedA decl -> TcM ()
badBootDecl :: forall decl.
HscSource -> String -> LocatedA decl -> TcRnIf TcGblEnv TcLclEnv ()
badBootDecl HscSource
hsc_src String
what (L SrcSpanAnnA
loc decl
_)
  = SrcSpan -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErrAt (forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc) (Char -> SDoc
char Char
'A' SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
what
      SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"declaration is not (currently) allowed in a"
      SDoc -> SDoc -> SDoc
<+> (case HscSource
hsc_src of
            HscSource
HsBootFile -> String -> SDoc
text String
"hs-boot"
            HscSource
HsigFile -> String -> SDoc
text String
"hsig"
            HscSource
_ -> forall a. String -> a
panic String
"badBootDecl: should be an hsig or hs-boot file")
      SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"file")

{-
Once we've typechecked the body of the module, we want to compare what
we've found (gathered in a TypeEnv) with the hi-boot details (if any).
-}

checkHiBootIface :: TcGblEnv -> SelfBootInfo -> TcM TcGblEnv
-- Compare the hi-boot file for this module (if there is one)
-- with the type environment we've just come up with
-- In the common case where there is no hi-boot file, the list
-- of boot_names is empty.

checkHiBootIface :: TcGblEnv -> SelfBootInfo -> TcM TcGblEnv
checkHiBootIface TcGblEnv
tcg_env SelfBootInfo
boot_info
  | SelfBootInfo
NoSelfBoot <- SelfBootInfo
boot_info  -- Common case
  = forall (m :: * -> *) a. Monad m => a -> m a
return TcGblEnv
tcg_env

  | HscSource
HsBootFile <- TcGblEnv -> HscSource
tcg_src TcGblEnv
tcg_env   -- Current module is already a hs-boot file!
  = forall (m :: * -> *) a. Monad m => a -> m a
return TcGblEnv
tcg_env

  | SelfBoot { sb_mds :: SelfBootInfo -> ModDetails
sb_mds = ModDetails
boot_details } <- SelfBootInfo
boot_info
  , TcGblEnv { tcg_binds :: TcGblEnv -> LHsBinds GhcTc
tcg_binds    = LHsBinds GhcTc
binds
             , tcg_insts :: TcGblEnv -> [ClsInst]
tcg_insts    = [ClsInst]
local_insts
             , tcg_type_env :: TcGblEnv -> TypeEnv
tcg_type_env = TypeEnv
local_type_env
             , tcg_exports :: TcGblEnv -> [AvailInfo]
tcg_exports  = [AvailInfo]
local_exports } <- TcGblEnv
tcg_env
  = do  { -- This code is tricky, see Note [DFun knot-tying]
        ; [(Var, Var)]
dfun_prs <- [ClsInst]
-> TypeEnv -> [AvailInfo] -> ModDetails -> TcM [(Var, Var)]
checkHiBootIface' [ClsInst]
local_insts TypeEnv
local_type_env
                                        [AvailInfo]
local_exports ModDetails
boot_details

        -- Now add the boot-dfun bindings  $fxblah = $fblah
        -- to (a) the type envt, and (b) the top-level bindings
        ; let boot_dfuns :: [Var]
boot_dfuns = forall a b. (a -> b) -> [a] -> [b]
map forall a b. (a, b) -> a
fst [(Var, Var)]
dfun_prs
              type_env' :: TypeEnv
type_env'  = TypeEnv -> [Var] -> TypeEnv
extendTypeEnvWithIds TypeEnv
local_type_env [Var]
boot_dfuns
              dfun_binds :: Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
dfun_binds = forall a. [a] -> Bag a
listToBag [ forall (p :: Pass).
IdP (GhcPass p) -> LHsExpr (GhcPass p) -> LHsBind (GhcPass p)
mkVarBind Var
boot_dfun (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Var
dfun)
                                     | (Var
boot_dfun, Var
dfun) <- [(Var, Var)]
dfun_prs ]
              tcg_env_w_binds :: TcGblEnv
tcg_env_w_binds
                = TcGblEnv
tcg_env { tcg_binds :: LHsBinds GhcTc
tcg_binds = LHsBinds GhcTc
binds forall a. Bag a -> Bag a -> Bag a
`unionBags` Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
dfun_binds }

        ; TypeEnv
type_env' seq :: forall a b. a -> b -> b
`seq`
             -- Why the seq?  Without, we will put a TypeEnv thunk in
             -- tcg_type_env_var.  That thunk will eventually get
             -- forced if we are typechecking interfaces, but that
             -- is no good if we are trying to typecheck the very
             -- DFun we were going to put in.
             -- TODO: Maybe setGlobalTypeEnv should be strict.
          TcGblEnv -> TypeEnv -> TcM TcGblEnv
setGlobalTypeEnv TcGblEnv
tcg_env_w_binds TypeEnv
type_env' }

#if __GLASGOW_HASKELL__ <= 810
  | otherwise = panic "checkHiBootIface: unreachable code"
#endif

{- Note [DFun impedance matching]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We return a list of "impedance-matching" bindings for the dfuns
defined in the hs-boot file, such as
          $fxEqT = $fEqT
We need these because the module and hi-boot file might differ in
the name it chose for the dfun: the name of a dfun is not
uniquely determined by its type; there might be multiple dfuns
which, individually, would map to the same name (in which case
we have to disambiguate them.)  There's no way for the hi file
to know exactly what disambiguation to use... without looking
at the hi-boot file itself.

In fact, the names will always differ because we always pick names
prefixed with "$fx" for boot dfuns, and "$f" for real dfuns
(so that this impedance matching is always possible).

Note [DFun knot-tying]
~~~~~~~~~~~~~~~~~~~~~~
The 'SelfBootInfo' that is fed into 'checkHiBootIface' comes from
typechecking the hi-boot file that we are presently implementing.
Suppose we are typechecking the module A: when we typecheck the
hi-boot file, whenever we see an identifier A.T, we knot-tie this
identifier to the *local* type environment (via if_rec_types.)  The
contract then is that we don't *look* at 'SelfBootInfo' until we've
finished typechecking the module and updated the type environment with
the new tycons and ids.

This most works well, but there is one problem: DFuns!  We do not want
to look at the mb_insts of the ModDetails in SelfBootInfo, because a
dfun in one of those ClsInsts is gotten (in GHC.IfaceToCore.tcIfaceInst) by a
(lazily evaluated) lookup in the if_rec_types.  We could extend the
type env, do a setGloblaTypeEnv etc; but that all seems very indirect.
It is much more directly simply to extract the DFunIds from the
md_types of the SelfBootInfo.

See #4003, #16038 for why we need to take care here.
-}

checkHiBootIface' :: [ClsInst] -> TypeEnv -> [AvailInfo]
                  -> ModDetails -> TcM [(Id, Id)]
-- Variant which doesn't require a full TcGblEnv; you could get the
-- local components from another ModDetails.
checkHiBootIface' :: [ClsInst]
-> TypeEnv -> [AvailInfo] -> ModDetails -> TcM [(Var, Var)]
checkHiBootIface'
        [ClsInst]
local_insts TypeEnv
local_type_env [AvailInfo]
local_exports
        (ModDetails { md_types :: ModDetails -> TypeEnv
md_types = TypeEnv
boot_type_env
                    , md_fam_insts :: ModDetails -> [FamInst]
md_fam_insts = [FamInst]
boot_fam_insts
                    , md_exports :: ModDetails -> [AvailInfo]
md_exports = [AvailInfo]
boot_exports })
  = do  { String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"checkHiBootIface" forall a b. (a -> b) -> a -> b
$ [SDoc] -> SDoc
vcat
             [ forall a. Outputable a => a -> SDoc
ppr TypeEnv
boot_type_env, forall a. Outputable a => a -> SDoc
ppr [AvailInfo]
boot_exports]

                -- Check the exports of the boot module, one by one
        ; forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ AvailInfo -> TcRnIf TcGblEnv TcLclEnv ()
check_export [AvailInfo]
boot_exports

                -- Check for no family instances
        ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [FamInst]
boot_fam_insts) forall a b. (a -> b) -> a -> b
$
            forall a. String -> a
panic (String
"GHC.Tc.Module.checkHiBootIface: Cannot handle family " forall a. [a] -> [a] -> [a]
++
                   String
"instances in boot files yet...")
            -- FIXME: Why?  The actual comparison is not hard, but what would
            --        be the equivalent to the dfun bindings returned for class
            --        instances?  We can't easily equate tycons...

                -- Check instance declarations
                -- and generate an impedance-matching binding
        ; [Maybe (Var, Var)]
mb_dfun_prs <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM Var -> TcM (Maybe (Var, Var))
check_cls_inst [Var]
boot_dfuns

        ; TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM

        ; forall (m :: * -> *) a. Monad m => a -> m a
return (forall a. [Maybe a] -> [a]
catMaybes [Maybe (Var, Var)]
mb_dfun_prs) }

  where
    boot_dfun_names :: [Name]
boot_dfun_names = forall a b. (a -> b) -> [a] -> [b]
map Var -> Name
idName [Var]
boot_dfuns
    boot_dfuns :: [Var]
boot_dfuns      = forall a. (a -> Bool) -> [a] -> [a]
filter Var -> Bool
isDFunId forall a b. (a -> b) -> a -> b
$ TypeEnv -> [Var]
typeEnvIds TypeEnv
boot_type_env
       -- NB: boot_dfuns is /not/ defined thus: map instanceDFunId md_insts
       --     We don't want to look at md_insts!
       --     Why not?  See Note [DFun knot-tying]

    check_export :: AvailInfo -> TcRnIf TcGblEnv TcLclEnv ()
check_export AvailInfo
boot_avail     -- boot_avail is exported by the boot iface
      | Name
name forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [Name]
boot_dfun_names = forall (m :: * -> *) a. Monad m => a -> m a
return ()
      | Name -> Bool
isWiredInName Name
name          = forall (m :: * -> *) a. Monad m => a -> m a
return () -- No checking for wired-in names.  In particular,
                                                -- 'error' is handled by a rather gross hack
                                                -- (see comments in GHC.Err.hs-boot)

        -- Check that the actual module exports the same thing
      | Bool -> Bool
not (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [Name]
missing_names)
      = SrcSpan -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErrAt (Name -> SrcSpan
nameSrcSpan (forall a. [a] -> a
head [Name]
missing_names))
                 (Bool -> Name -> String -> SDoc
missingBootThing Bool
True (forall a. [a] -> a
head [Name]
missing_names) String
"exported by")

        -- If the boot module does not *define* the thing, we are done
        -- (it simply re-exports it, and names match, so nothing further to do)
      | forall a. Maybe a -> Bool
isNothing Maybe TyThing
mb_boot_thing = forall (m :: * -> *) a. Monad m => a -> m a
return ()

        -- Check that the actual module also defines the thing, and
        -- then compare the definitions
      | Just TyThing
real_thing <- TypeEnv -> Name -> Maybe TyThing
lookupTypeEnv TypeEnv
local_type_env Name
name,
        Just TyThing
boot_thing <- Maybe TyThing
mb_boot_thing
      = Bool -> TyThing -> TyThing -> TcRnIf TcGblEnv TcLclEnv ()
checkBootDeclM Bool
True TyThing
boot_thing TyThing
real_thing

      | Bool
otherwise
      = SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErrTc (Bool -> Name -> String -> SDoc
missingBootThing Bool
True Name
name String
"defined in")
      where
        name :: Name
name          = AvailInfo -> Name
availName AvailInfo
boot_avail
        mb_boot_thing :: Maybe TyThing
mb_boot_thing = TypeEnv -> Name -> Maybe TyThing
lookupTypeEnv TypeEnv
boot_type_env Name
name
        missing_names :: [Name]
missing_names = case forall a. NameEnv a -> Name -> Maybe a
lookupNameEnv NameEnv AvailInfo
local_export_env Name
name of
                          Maybe AvailInfo
Nothing    -> [Name
name]
                          Just AvailInfo
avail -> AvailInfo -> [Name]
availNames AvailInfo
boot_avail forall a. Ord a => [a] -> [a] -> [a]
`minusList` AvailInfo -> [Name]
availNames AvailInfo
avail

    local_export_env :: NameEnv AvailInfo
    local_export_env :: NameEnv AvailInfo
local_export_env = [AvailInfo] -> NameEnv AvailInfo
availsToNameEnv [AvailInfo]
local_exports

    check_cls_inst :: DFunId -> TcM (Maybe (Id, Id))
        -- Returns a pair of the boot dfun in terms of the equivalent
        -- real dfun. Delicate (like checkBootDecl) because it depends
        -- on the types lining up precisely even to the ordering of
        -- the type variables in the foralls.
    check_cls_inst :: Var -> TcM (Maybe (Var, Var))
check_cls_inst Var
boot_dfun
      | (Var
real_dfun : [Var]
_) <- Var -> [Var]
find_real_dfun Var
boot_dfun
      , let local_boot_dfun :: Var
local_boot_dfun = Name -> Type -> Var
Id.mkExportedVanillaId
                                  (Var -> Name
idName Var
boot_dfun) (Var -> Type
idType Var
real_dfun)
      = forall (m :: * -> *) a. Monad m => a -> m a
return (forall a. a -> Maybe a
Just (Var
local_boot_dfun, Var
real_dfun))
          -- Two tricky points here:
          --
          --  * The local_boot_fun should have a Name from the /boot-file/,
          --    but type from the dfun defined in /this module/.
          --    That ensures that the TyCon etc inside the type are
          --    the ones defined in this module, not the ones gotten
          --    from the hi-boot file, which may have a lot less info
          --    (#8743, comment:10).
          --
          --  * The DFunIds from boot_details are /GlobalIds/, because
          --    they come from typechecking M.hi-boot.
          --    But all bindings in this module should be for /LocalIds/,
          --    otherwise dependency analysis fails (#16038). This
          --    is another reason for using mkExportedVanillaId, rather
          --    that modifying boot_dfun, to make local_boot_fun.

      | Bool
otherwise
      = forall a. SrcSpan -> TcRn a -> TcRn a
setSrcSpan (Name -> SrcSpan
nameSrcSpan (forall a. NamedThing a => a -> Name
getName Var
boot_dfun)) forall a b. (a -> b) -> a -> b
$
        do { String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"check_cls_inst" forall a b. (a -> b) -> a -> b
$ [SDoc] -> SDoc
vcat
                [ String -> SDoc
text String
"local_insts"  SDoc -> SDoc -> SDoc
<+>
                     [SDoc] -> SDoc
vcat (forall a b. (a -> b) -> [a] -> [b]
map (forall a. Outputable a => a -> SDoc
ppr forall b c a. (b -> c) -> (a -> b) -> a -> c
. Var -> Type
idType forall b c a. (b -> c) -> (a -> b) -> a -> c
. ClsInst -> Var
instanceDFunId) [ClsInst]
local_insts)
                , String -> SDoc
text String
"boot_dfun_ty" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr (Var -> Type
idType Var
boot_dfun) ]

           ; SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErrTc (Var -> SDoc
instMisMatch Var
boot_dfun)
           ; forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing }

    find_real_dfun :: DFunId -> [DFunId]
    find_real_dfun :: Var -> [Var]
find_real_dfun Var
boot_dfun
       = [Var
dfun | ClsInst
inst <- [ClsInst]
local_insts
               , let dfun :: Var
dfun = ClsInst -> Var
instanceDFunId ClsInst
inst
               , Var -> Type
idType Var
dfun Type -> Type -> Bool
`eqType` Type
boot_dfun_ty ]
       where
          boot_dfun_ty :: Type
boot_dfun_ty   = Var -> Type
idType Var
boot_dfun


-- In general, to perform these checks we have to
-- compare the TyThing from the .hi-boot file to the TyThing
-- in the current source file.  We must be careful to allow alpha-renaming
-- where appropriate, and also the boot declaration is allowed to omit
-- constructors and class methods.
--
-- See rnfail055 for a good test of this stuff.

-- | Compares two things for equivalence between boot-file and normal code,
-- reporting an error if they don't match up.
checkBootDeclM :: Bool  -- ^ True <=> an hs-boot file (could also be a sig)
               -> TyThing -> TyThing -> TcM ()
checkBootDeclM :: Bool -> TyThing -> TyThing -> TcRnIf TcGblEnv TcLclEnv ()
checkBootDeclM Bool
is_boot TyThing
boot_thing TyThing
real_thing
  = forall (m :: * -> *) a. Monad m => Maybe a -> (a -> m ()) -> m ()
whenIsJust (Bool -> TyThing -> TyThing -> Maybe SDoc
checkBootDecl Bool
is_boot TyThing
boot_thing TyThing
real_thing) forall a b. (a -> b) -> a -> b
$ \ SDoc
err ->
       SrcSpan -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErrAt SrcSpan
span
                (Bool -> SDoc -> TyThing -> TyThing -> SDoc
bootMisMatch Bool
is_boot SDoc
err TyThing
real_thing TyThing
boot_thing)
  where
    -- Here we use the span of the boot thing or, if it doesn't have a sensible
    -- span, that of the real thing,
    span :: SrcSpan
span
      | let span :: SrcSpan
span = Name -> SrcSpan
nameSrcSpan (forall a. NamedThing a => a -> Name
getName TyThing
boot_thing)
      , SrcSpan -> Bool
isGoodSrcSpan SrcSpan
span
      = SrcSpan
span
      | Bool
otherwise
      = Name -> SrcSpan
nameSrcSpan (forall a. NamedThing a => a -> Name
getName TyThing
real_thing)

-- | Compares the two things for equivalence between boot-file and normal
-- code. Returns @Nothing@ on success or @Just "some helpful info for user"@
-- failure. If the difference will be apparent to the user, @Just empty@ is
-- perfectly suitable.
checkBootDecl :: Bool -> TyThing -> TyThing -> Maybe SDoc

checkBootDecl :: Bool -> TyThing -> TyThing -> Maybe SDoc
checkBootDecl Bool
_ (AnId Var
id1) (AnId Var
id2)
  = ASSERT(id1 == id2)
    Bool -> SDoc -> Maybe SDoc
check (Var -> Type
idType Var
id1 Type -> Type -> Bool
`eqType` Var -> Type
idType Var
id2)
          (String -> SDoc
text String
"The two types are different")

checkBootDecl Bool
is_boot (ATyCon TyCon
tc1) (ATyCon TyCon
tc2)
  = Bool -> TyCon -> TyCon -> Maybe SDoc
checkBootTyCon Bool
is_boot TyCon
tc1 TyCon
tc2

checkBootDecl Bool
_ (AConLike (RealDataCon DataCon
dc1)) (AConLike (RealDataCon DataCon
_))
  = forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"checkBootDecl" (forall a. Outputable a => a -> SDoc
ppr DataCon
dc1)

checkBootDecl Bool
_ TyThing
_ TyThing
_ = forall a. a -> Maybe a
Just SDoc
empty -- probably shouldn't happen

-- | Combines two potential error messages
andThenCheck :: Maybe SDoc -> Maybe SDoc -> Maybe SDoc
Maybe SDoc
Nothing andThenCheck :: Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck` Maybe SDoc
msg     = Maybe SDoc
msg
Maybe SDoc
msg     `andThenCheck` Maybe SDoc
Nothing = Maybe SDoc
msg
Just SDoc
d1 `andThenCheck` Just SDoc
d2 = forall a. a -> Maybe a
Just (SDoc
d1 SDoc -> SDoc -> SDoc
$$ SDoc
d2)
infixr 0 `andThenCheck`

-- | If the test in the first parameter is True, succeed with @Nothing@;
-- otherwise, return the provided check
checkUnless :: Bool -> Maybe SDoc -> Maybe SDoc
checkUnless :: Bool -> Maybe SDoc -> Maybe SDoc
checkUnless Bool
True  Maybe SDoc
_ = forall a. Maybe a
Nothing
checkUnless Bool
False Maybe SDoc
k = Maybe SDoc
k

-- | Run the check provided for every pair of elements in the lists.
-- The provided SDoc should name the element type, in the plural.
checkListBy :: (a -> a -> Maybe SDoc) -> [a] -> [a] -> SDoc
            -> Maybe SDoc
checkListBy :: forall a.
(a -> a -> Maybe SDoc) -> [a] -> [a] -> SDoc -> Maybe SDoc
checkListBy a -> a -> Maybe SDoc
check_fun [a]
as [a]
bs SDoc
whats = [SDoc] -> [a] -> [a] -> Maybe SDoc
go [] [a]
as [a]
bs
  where
    herald :: SDoc
herald = String -> SDoc
text String
"The" SDoc -> SDoc -> SDoc
<+> SDoc
whats SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"do not match"

    go :: [SDoc] -> [a] -> [a] -> Maybe SDoc
go []   [] [] = forall a. Maybe a
Nothing
    go [SDoc]
docs [] [] = forall a. a -> Maybe a
Just (SDoc -> Arity -> SDoc -> SDoc
hang (SDoc
herald SDoc -> SDoc -> SDoc
<> SDoc
colon) Arity
2 ([SDoc] -> SDoc
vcat forall a b. (a -> b) -> a -> b
$ forall a. [a] -> [a]
reverse [SDoc]
docs))
    go [SDoc]
docs (a
x:[a]
xs) (a
y:[a]
ys) = case a -> a -> Maybe SDoc
check_fun a
x a
y of
      Just SDoc
doc -> [SDoc] -> [a] -> [a] -> Maybe SDoc
go (SDoc
docforall a. a -> [a] -> [a]
:[SDoc]
docs) [a]
xs [a]
ys
      Maybe SDoc
Nothing  -> [SDoc] -> [a] -> [a] -> Maybe SDoc
go [SDoc]
docs       [a]
xs [a]
ys
    go [SDoc]
_    [a]
_  [a]
_ = forall a. a -> Maybe a
Just (SDoc -> Arity -> SDoc -> SDoc
hang (SDoc
herald SDoc -> SDoc -> SDoc
<> SDoc
colon)
                            Arity
2 (String -> SDoc
text String
"There are different numbers of" SDoc -> SDoc -> SDoc
<+> SDoc
whats))

-- | If the test in the first parameter is True, succeed with @Nothing@;
-- otherwise, fail with the given SDoc.
check :: Bool -> SDoc -> Maybe SDoc
check :: Bool -> SDoc -> Maybe SDoc
check Bool
True  SDoc
_   = forall a. Maybe a
Nothing
check Bool
False SDoc
doc = forall a. a -> Maybe a
Just SDoc
doc

-- | A more perspicuous name for @Nothing@, for @checkBootDecl@ and friends.
checkSuccess :: Maybe SDoc
checkSuccess :: Maybe SDoc
checkSuccess = forall a. Maybe a
Nothing

----------------
checkBootTyCon :: Bool -> TyCon -> TyCon -> Maybe SDoc
checkBootTyCon :: Bool -> TyCon -> TyCon -> Maybe SDoc
checkBootTyCon Bool
is_boot TyCon
tc1 TyCon
tc2
  | Bool -> Bool
not (Type -> Type -> Bool
eqType (TyCon -> Type
tyConKind TyCon
tc1) (TyCon -> Type
tyConKind TyCon
tc2))
  = forall a. a -> Maybe a
Just forall a b. (a -> b) -> a -> b
$ String -> SDoc
text String
"The types have different kinds"    -- First off, check the kind

  | Just Class
c1 <- TyCon -> Maybe Class
tyConClass_maybe TyCon
tc1
  , Just Class
c2 <- TyCon -> Maybe Class
tyConClass_maybe TyCon
tc2
  , let ([Var]
clas_tvs1, [FunDep Var]
clas_fds1, [Type]
sc_theta1, [Var]
_, [ClassATItem]
ats1, [ClassOpItem]
op_stuff1)
          = Class
-> ([Var], [FunDep Var], [Type], [Var], [ClassATItem],
    [ClassOpItem])
classExtraBigSig Class
c1
        ([Var]
clas_tvs2, [FunDep Var]
clas_fds2, [Type]
sc_theta2, [Var]
_, [ClassATItem]
ats2, [ClassOpItem]
op_stuff2)
          = Class
-> ([Var], [FunDep Var], [Type], [Var], [ClassATItem],
    [ClassOpItem])
classExtraBigSig Class
c2
  , Just RnEnv2
env <- RnEnv2 -> [Var] -> [Var] -> Maybe RnEnv2
eqVarBndrs RnEnv2
emptyRnEnv2 [Var]
clas_tvs1 [Var]
clas_tvs2
  = let
       eqSig :: ClassOpItem -> ClassOpItem -> Maybe SDoc
eqSig (Var
id1, Maybe (Name, DefMethSpec Type)
def_meth1) (Var
id2, Maybe (Name, DefMethSpec Type)
def_meth2)
         = Bool -> SDoc -> Maybe SDoc
check (Name
name1 forall a. Eq a => a -> a -> Bool
== Name
name2)
                 (String -> SDoc
text String
"The names" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"and" SDoc -> SDoc -> SDoc
<+> SDoc
pname2 SDoc -> SDoc -> SDoc
<+>
                  String -> SDoc
text String
"are different") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
           Bool -> SDoc -> Maybe SDoc
check (RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
op_ty1 Type
op_ty2)
                 (String -> SDoc
text String
"The types of" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+>
                  String -> SDoc
text String
"are different") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
           if Bool
is_boot
               then Bool -> SDoc -> Maybe SDoc
check (forall a. (a -> a -> Bool) -> Maybe a -> Maybe a -> Bool
eqMaybeBy (Name, DefMethSpec Type) -> (Name, DefMethSpec Type) -> Bool
eqDM Maybe (Name, DefMethSpec Type)
def_meth1 Maybe (Name, DefMethSpec Type)
def_meth2)
                          (String -> SDoc
text String
"The default methods associated with" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+>
                           String -> SDoc
text String
"are different")
               else Bool -> SDoc -> Maybe SDoc
check (Type
-> Maybe (Name, DefMethSpec Type)
-> Maybe (Name, DefMethSpec Type)
-> Bool
subDM Type
op_ty1 Maybe (Name, DefMethSpec Type)
def_meth1 Maybe (Name, DefMethSpec Type)
def_meth2)
                          (String -> SDoc
text String
"The default methods associated with" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+>
                           String -> SDoc
text String
"are not compatible")
         where
          name1 :: Name
name1 = Var -> Name
idName Var
id1
          name2 :: Name
name2 = Var -> Name
idName Var
id2
          pname1 :: SDoc
pname1 = SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Name
name1)
          pname2 :: SDoc
pname2 = SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Name
name2)
          op_ty1 :: Type
op_ty1 = Var -> Type
classMethodTy Var
id1
          op_ty2 :: Type
op_ty2 = Var -> Type
classMethodTy Var
id2

       eqAT :: ClassATItem -> ClassATItem -> Maybe SDoc
eqAT (ATI TyCon
tc1 Maybe (Type, ATValidityInfo)
def_ats1) (ATI TyCon
tc2 Maybe (Type, ATValidityInfo)
def_ats2)
         = Bool -> TyCon -> TyCon -> Maybe SDoc
checkBootTyCon Bool
is_boot TyCon
tc1 TyCon
tc2 Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
           Bool -> SDoc -> Maybe SDoc
check (Maybe (Type, ATValidityInfo)
-> Maybe (Type, ATValidityInfo) -> Bool
eqATDef Maybe (Type, ATValidityInfo)
def_ats1 Maybe (Type, ATValidityInfo)
def_ats2)
                 (String -> SDoc
text String
"The associated type defaults differ")

       eqDM :: (Name, DefMethSpec Type) -> (Name, DefMethSpec Type) -> Bool
eqDM (Name
_, DefMethSpec Type
VanillaDM)    (Name
_, DefMethSpec Type
VanillaDM)    = Bool
True
       eqDM (Name
_, GenericDM Type
t1) (Name
_, GenericDM Type
t2) = RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
t1 Type
t2
       eqDM (Name, DefMethSpec Type)
_ (Name, DefMethSpec Type)
_ = Bool
False

       -- NB: first argument is from hsig, second is from real impl.
       -- Order of pattern matching matters.
       subDM :: Type
-> Maybe (Name, DefMethSpec Type)
-> Maybe (Name, DefMethSpec Type)
-> Bool
subDM Type
_ Maybe (Name, DefMethSpec Type)
Nothing Maybe (Name, DefMethSpec Type)
_ = Bool
True
       subDM Type
_ Maybe (Name, DefMethSpec Type)
_ Maybe (Name, DefMethSpec Type)
Nothing = Bool
False
       -- If the hsig wrote:
       --
       --   f :: a -> a
       --   default f :: a -> a
       --
       -- this should be validly implementable using an old-fashioned
       -- vanilla default method.
       subDM Type
t1 (Just (Name
_, GenericDM Type
t2)) (Just (Name
_, DefMethSpec Type
VanillaDM))
        = RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
t1 Type
t2
       -- This case can occur when merging signatures
       subDM Type
t1 (Just (Name
_, DefMethSpec Type
VanillaDM)) (Just (Name
_, GenericDM Type
t2))
        = RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
t1 Type
t2
       subDM Type
_ (Just (Name
_, DefMethSpec Type
VanillaDM)) (Just (Name
_, DefMethSpec Type
VanillaDM)) = Bool
True
       subDM Type
_ (Just (Name
_, GenericDM Type
t1)) (Just (Name
_, GenericDM Type
t2))
        = RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
t1 Type
t2

       -- Ignore the location of the defaults
       eqATDef :: Maybe (Type, ATValidityInfo)
-> Maybe (Type, ATValidityInfo) -> Bool
eqATDef Maybe (Type, ATValidityInfo)
Nothing             Maybe (Type, ATValidityInfo)
Nothing             = Bool
True
       eqATDef (Just (Type
ty1, ATValidityInfo
_loc1)) (Just (Type
ty2, ATValidityInfo
_loc2)) = RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
ty1 Type
ty2
       eqATDef Maybe (Type, ATValidityInfo)
_ Maybe (Type, ATValidityInfo)
_ = Bool
False

       eqFD :: FunDep Var -> FunDep Var -> Bool
eqFD ([Var]
as1,[Var]
bs1) ([Var]
as2,[Var]
bs2) =
         forall a. (a -> a -> Bool) -> [a] -> [a] -> Bool
eqListBy (RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env) ([Var] -> [Type]
mkTyVarTys [Var]
as1) ([Var] -> [Type]
mkTyVarTys [Var]
as2) Bool -> Bool -> Bool
&&
         forall a. (a -> a -> Bool) -> [a] -> [a] -> Bool
eqListBy (RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env) ([Var] -> [Type]
mkTyVarTys [Var]
bs1) ([Var] -> [Type]
mkTyVarTys [Var]
bs2)
    in
    [Role] -> [Role] -> Maybe SDoc
checkRoles [Role]
roles1 [Role]
roles2 Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
          -- Checks kind of class
    Bool -> SDoc -> Maybe SDoc
check (forall a. (a -> a -> Bool) -> [a] -> [a] -> Bool
eqListBy FunDep Var -> FunDep Var -> Bool
eqFD [FunDep Var]
clas_fds1 [FunDep Var]
clas_fds2)
          (String -> SDoc
text String
"The functional dependencies do not match") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    Bool -> Maybe SDoc -> Maybe SDoc
checkUnless (TyCon -> Bool
isAbstractTyCon TyCon
tc1) forall a b. (a -> b) -> a -> b
$
    Bool -> SDoc -> Maybe SDoc
check (forall a. (a -> a -> Bool) -> [a] -> [a] -> Bool
eqListBy (RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env) [Type]
sc_theta1 [Type]
sc_theta2)
          (String -> SDoc
text String
"The class constraints do not match") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    forall a.
(a -> a -> Maybe SDoc) -> [a] -> [a] -> SDoc -> Maybe SDoc
checkListBy ClassOpItem -> ClassOpItem -> Maybe SDoc
eqSig [ClassOpItem]
op_stuff1 [ClassOpItem]
op_stuff2 (String -> SDoc
text String
"methods") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    forall a.
(a -> a -> Maybe SDoc) -> [a] -> [a] -> SDoc -> Maybe SDoc
checkListBy ClassATItem -> ClassATItem -> Maybe SDoc
eqAT [ClassATItem]
ats1 [ClassATItem]
ats2 (String -> SDoc
text String
"associated types") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    Bool -> SDoc -> Maybe SDoc
check (Class -> ClassMinimalDef
classMinimalDef Class
c1 forall a.
Uniquable a =>
BooleanFormula a -> BooleanFormula a -> Bool
`BF.implies` Class -> ClassMinimalDef
classMinimalDef Class
c2)
        (String -> SDoc
text String
"The MINIMAL pragmas are not compatible")

  | Just Type
syn_rhs1 <- TyCon -> DFunInstType
synTyConRhs_maybe TyCon
tc1
  , Just Type
syn_rhs2 <- TyCon -> DFunInstType
synTyConRhs_maybe TyCon
tc2
  , Just RnEnv2
env <- RnEnv2 -> [Var] -> [Var] -> Maybe RnEnv2
eqVarBndrs RnEnv2
emptyRnEnv2 (TyCon -> [Var]
tyConTyVars TyCon
tc1) (TyCon -> [Var]
tyConTyVars TyCon
tc2)
  = ASSERT(tc1 == tc2)
    [Role] -> [Role] -> Maybe SDoc
checkRoles [Role]
roles1 [Role]
roles2 Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    Bool -> SDoc -> Maybe SDoc
check (RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
syn_rhs1 Type
syn_rhs2) SDoc
empty   -- nothing interesting to say
  -- This allows abstract 'data T a' to be implemented using 'type T = ...'
  -- and abstract 'class K a' to be implement using 'type K = ...'
  -- See Note [Synonyms implement abstract data]
  | Bool -> Bool
not Bool
is_boot -- don't support for hs-boot yet
  , TyCon -> Bool
isAbstractTyCon TyCon
tc1
  , Just ([Var]
tvs, Type
ty) <- TyCon -> Maybe ([Var], Type)
synTyConDefn_maybe TyCon
tc2
  , Just (TyCon
tc2', [Type]
args) <- HasCallStack => Type -> Maybe (TyCon, [Type])
tcSplitTyConApp_maybe Type
ty
  = [Var] -> Type -> TyCon -> [Type] -> Maybe SDoc
checkSynAbsData [Var]
tvs Type
ty TyCon
tc2' [Type]
args
    -- TODO: When it's a synonym implementing a class, we really
    -- should check if the fundeps are satisfied, but
    -- there is not an obvious way to do this for a constraint synonym.
    -- So for now, let it all through (it won't cause segfaults, anyway).
    -- Tracked at #12704.

  -- This allows abstract 'data T :: Nat' to be implemented using
  -- 'type T = 42' Since the kinds already match (we have checked this
  -- upfront) all we need to check is that the implementation 'type T
  -- = ...' defined an actual literal.  See #15138 for the case this
  -- handles.
  | Bool -> Bool
not Bool
is_boot
  , TyCon -> Bool
isAbstractTyCon TyCon
tc1
  , Just ([Var]
_,Type
ty2) <- TyCon -> Maybe ([Var], Type)
synTyConDefn_maybe TyCon
tc2
  , forall a. Maybe a -> Bool
isJust (Type -> Maybe TyLit
isLitTy Type
ty2)
  = forall a. Maybe a
Nothing

  | Just FamTyConFlav
fam_flav1 <- TyCon -> Maybe FamTyConFlav
famTyConFlav_maybe TyCon
tc1
  , Just FamTyConFlav
fam_flav2 <- TyCon -> Maybe FamTyConFlav
famTyConFlav_maybe TyCon
tc2
  = ASSERT(tc1 == tc2)
    let eqFamFlav :: FamTyConFlav -> FamTyConFlav -> Bool
eqFamFlav FamTyConFlav
OpenSynFamilyTyCon   FamTyConFlav
OpenSynFamilyTyCon = Bool
True
        eqFamFlav (DataFamilyTyCon {}) (DataFamilyTyCon {}) = Bool
True
        -- This case only happens for hsig merging:
        eqFamFlav FamTyConFlav
AbstractClosedSynFamilyTyCon FamTyConFlav
AbstractClosedSynFamilyTyCon = Bool
True
        eqFamFlav FamTyConFlav
AbstractClosedSynFamilyTyCon (ClosedSynFamilyTyCon {}) = Bool
True
        eqFamFlav (ClosedSynFamilyTyCon {}) FamTyConFlav
AbstractClosedSynFamilyTyCon = Bool
True
        eqFamFlav (ClosedSynFamilyTyCon Maybe (CoAxiom Branched)
ax1) (ClosedSynFamilyTyCon Maybe (CoAxiom Branched)
ax2)
            = forall {br :: BranchFlag} {br :: BranchFlag}.
Maybe (CoAxiom br) -> Maybe (CoAxiom br) -> Bool
eqClosedFamilyAx Maybe (CoAxiom Branched)
ax1 Maybe (CoAxiom Branched)
ax2
        eqFamFlav (BuiltInSynFamTyCon {}) (BuiltInSynFamTyCon {}) = TyCon
tc1 forall a. Eq a => a -> a -> Bool
== TyCon
tc2
        eqFamFlav FamTyConFlav
_ FamTyConFlav
_ = Bool
False
        injInfo1 :: Injectivity
injInfo1 = TyCon -> Injectivity
tyConInjectivityInfo TyCon
tc1
        injInfo2 :: Injectivity
injInfo2 = TyCon -> Injectivity
tyConInjectivityInfo TyCon
tc2
    in
    -- check equality of roles, family flavours and injectivity annotations
    -- (NB: Type family roles are always nominal. But the check is
    -- harmless enough.)
    [Role] -> [Role] -> Maybe SDoc
checkRoles [Role]
roles1 [Role]
roles2 Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    Bool -> SDoc -> Maybe SDoc
check (FamTyConFlav -> FamTyConFlav -> Bool
eqFamFlav FamTyConFlav
fam_flav1 FamTyConFlav
fam_flav2)
        (SDoc -> SDoc
whenPprDebug forall a b. (a -> b) -> a -> b
$
            String -> SDoc
text String
"Family flavours" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr FamTyConFlav
fam_flav1 SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"and" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr FamTyConFlav
fam_flav2 SDoc -> SDoc -> SDoc
<+>
            String -> SDoc
text String
"do not match") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    Bool -> SDoc -> Maybe SDoc
check (Injectivity
injInfo1 forall a. Eq a => a -> a -> Bool
== Injectivity
injInfo2) (String -> SDoc
text String
"Injectivities do not match")

  | TyCon -> Bool
isAlgTyCon TyCon
tc1 Bool -> Bool -> Bool
&& TyCon -> Bool
isAlgTyCon TyCon
tc2
  , Just RnEnv2
env <- RnEnv2 -> [Var] -> [Var] -> Maybe RnEnv2
eqVarBndrs RnEnv2
emptyRnEnv2 (TyCon -> [Var]
tyConTyVars TyCon
tc1) (TyCon -> [Var]
tyConTyVars TyCon
tc2)
  = ASSERT(tc1 == tc2)
    [Role] -> [Role] -> Maybe SDoc
checkRoles [Role]
roles1 [Role]
roles2 Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    Bool -> SDoc -> Maybe SDoc
check (forall a. (a -> a -> Bool) -> [a] -> [a] -> Bool
eqListBy (RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env)
                     (TyCon -> [Type]
tyConStupidTheta TyCon
tc1) (TyCon -> [Type]
tyConStupidTheta TyCon
tc2))
          (String -> SDoc
text String
"The datatype contexts do not match") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
    forall {p}. p -> AlgTyConRhs -> AlgTyConRhs -> Maybe SDoc
eqAlgRhs TyCon
tc1 (TyCon -> AlgTyConRhs
algTyConRhs TyCon
tc1) (TyCon -> AlgTyConRhs
algTyConRhs TyCon
tc2)

  | Bool
otherwise = forall a. a -> Maybe a
Just SDoc
empty   -- two very different types -- should be obvious
  where
    roles1 :: [Role]
roles1 = TyCon -> [Role]
tyConRoles TyCon
tc1 -- the abstract one
    roles2 :: [Role]
roles2 = TyCon -> [Role]
tyConRoles TyCon
tc2
    roles_msg :: SDoc
roles_msg = String -> SDoc
text String
"The roles do not match." SDoc -> SDoc -> SDoc
$$
                (String -> SDoc
text String
"Roles on abstract types default to" SDoc -> SDoc -> SDoc
<+>
                 SDoc -> SDoc
quotes (String -> SDoc
text String
"representational") SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"in boot files.")

    roles_subtype_msg :: SDoc
roles_subtype_msg = String -> SDoc
text String
"The roles are not compatible:" SDoc -> SDoc -> SDoc
$$
                        String -> SDoc
text String
"Main module:" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr [Role]
roles2 SDoc -> SDoc -> SDoc
$$
                        String -> SDoc
text String
"Hsig file:" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr [Role]
roles1

    checkRoles :: [Role] -> [Role] -> Maybe SDoc
checkRoles [Role]
r1 [Role]
r2
      | Bool
is_boot Bool -> Bool -> Bool
|| TyCon -> Role -> Bool
isInjectiveTyCon TyCon
tc1 Role
Representational -- See Note [Role subtyping]
      = Bool -> SDoc -> Maybe SDoc
check ([Role]
r1 forall a. Eq a => a -> a -> Bool
== [Role]
r2) SDoc
roles_msg
      | Bool
otherwise = Bool -> SDoc -> Maybe SDoc
check ([Role]
r2 forall {a}. Ord a => [a] -> [a] -> Bool
`rolesSubtypeOf` [Role]
r1) SDoc
roles_subtype_msg

    -- Note [Role subtyping]
    -- ~~~~~~~~~~~~~~~~~~~~~
    -- In the current formulation of roles, role subtyping is only OK if the
    -- "abstract" TyCon was not representationally injective.  Among the most
    -- notable examples of non representationally injective TyCons are abstract
    -- data, which can be implemented via newtypes (which are not
    -- representationally injective).  The key example is
    -- in this example from #13140:
    --
    --      -- In an hsig file
    --      data T a -- abstract!
    --      type role T nominal
    --
    --      -- Elsewhere
    --      foo :: Coercible (T a) (T b) => a -> b
    --      foo x = x
    --
    -- We must NOT allow foo to typecheck, because if we instantiate
    -- T with a concrete data type with a phantom role would cause
    -- Coercible (T a) (T b) to be provable.  Fortunately, if T is not
    -- representationally injective, we cannot make the inference that a ~N b if
    -- T a ~R T b.
    --
    -- Unconditional role subtyping would be possible if we setup
    -- an extra set of roles saying when we can project out coercions
    -- (we call these proj-roles); then it would NOT be valid to instantiate T
    -- with a data type at phantom since the proj-role subtyping check
    -- would fail.  See #13140 for more details.
    --
    -- One consequence of this is we get no role subtyping for non-abstract
    -- data types in signatures. Suppose you have:
    --
    --      signature A where
    --          type role T nominal
    --          data T a = MkT
    --
    -- If you write this, we'll treat T as injective, and make inferences
    -- like T a ~R T b ==> a ~N b (mkNthCo).  But if we can
    -- subsequently replace T with one at phantom role, we would then be able to
    -- infer things like T Int ~R T Bool which is bad news.
    --
    -- We could allow role subtyping here if we didn't treat *any* data types
    -- defined in signatures as injective.  But this would be a bit surprising,
    -- replacing a data type in a module with one in a signature could cause
    -- your code to stop typechecking (whereas if you made the type abstract,
    -- it is more understandable that the type checker knows less).
    --
    -- It would have been best if this was purely a question of defaults
    -- (i.e., a user could explicitly ask for one behavior or another) but
    -- the current role system isn't expressive enough to do this.
    -- Having explicit proj-roles would solve this problem.

    rolesSubtypeOf :: [a] -> [a] -> Bool
rolesSubtypeOf [] [] = Bool
True
    -- NB: this relation is the OPPOSITE of the subroling relation
    rolesSubtypeOf (a
x:[a]
xs) (a
y:[a]
ys) = a
x forall a. Ord a => a -> a -> Bool
>= a
y Bool -> Bool -> Bool
&& [a] -> [a] -> Bool
rolesSubtypeOf [a]
xs [a]
ys
    rolesSubtypeOf [a]
_ [a]
_ = Bool
False

    -- Note [Synonyms implement abstract data]
    -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    -- An abstract data type or class can be implemented using a type synonym,
    -- but ONLY if the type synonym is nullary and has no type family
    -- applications.  This arises from two properties of skolem abstract data:
    --
    --    For any T (with some number of paramaters),
    --
    --    1. T is a valid type (it is "curryable"), and
    --
    --    2. T is valid in an instance head (no type families).
    --
    -- See also 'HowAbstract' and Note [Skolem abstract data].

    -- | Given @type T tvs = ty@, where @ty@ decomposes into @tc2' args@,
    -- check that this synonym is an acceptable implementation of @tc1@.
    -- See Note [Synonyms implement abstract data]
    checkSynAbsData :: [TyVar] -> Type -> TyCon -> [Type] -> Maybe SDoc
    checkSynAbsData :: [Var] -> Type -> TyCon -> [Type] -> Maybe SDoc
checkSynAbsData [Var]
tvs Type
ty TyCon
tc2' [Type]
args =
        Bool -> SDoc -> Maybe SDoc
check (forall (t :: * -> *) a. Foldable t => t a -> Bool
null (Type -> [(TyCon, [Type])]
tcTyFamInsts Type
ty))
              (String -> SDoc
text String
"Illegal type family application in implementation of abstract data.")
                Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
        Bool -> SDoc -> Maybe SDoc
check (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [Var]
tvs)
              (String -> SDoc
text String
"Illegal parameterized type synonym in implementation of abstract data." SDoc -> SDoc -> SDoc
$$
               String -> SDoc
text String
"(Try eta reducing your type synonym so that it is nullary.)")
                Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
        -- Don't report roles errors unless the type synonym is nullary
        Bool -> Maybe SDoc -> Maybe SDoc
checkUnless (Bool -> Bool
not (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [Var]
tvs)) forall a b. (a -> b) -> a -> b
$
            ASSERT( null roles2 )
            -- If we have something like:
            --
            --  signature H where
            --      data T a
            --  module H where
            --      data K a b = ...
            --      type T = K Int
            --
            -- we need to drop the first role of K when comparing!
            [Role] -> [Role] -> Maybe SDoc
checkRoles [Role]
roles1 (forall a. Arity -> [a] -> [a]
drop (forall (t :: * -> *) a. Foldable t => t a -> Arity
length [Type]
args) (TyCon -> [Role]
tyConRoles TyCon
tc2'))
{-
        -- Hypothetically, if we were allow to non-nullary type synonyms, here
        -- is how you would check the roles
        if length tvs == length roles1
            then checkRoles roles1 roles2
            else case tcSplitTyConApp_maybe ty of
                    Just (tc2', args) ->
                        checkRoles roles1 (drop (length args) (tyConRoles tc2') ++ roles2)
                    Nothing -> Just roles_msg
-}

    eqAlgRhs :: p -> AlgTyConRhs -> AlgTyConRhs -> Maybe SDoc
eqAlgRhs p
_ AlgTyConRhs
AbstractTyCon AlgTyConRhs
_rhs2
      = Maybe SDoc
checkSuccess -- rhs2 is guaranteed to be injective, since it's an AlgTyCon
    eqAlgRhs p
_  tc1 :: AlgTyConRhs
tc1@DataTyCon{} tc2 :: AlgTyConRhs
tc2@DataTyCon{} =
        forall a.
(a -> a -> Maybe SDoc) -> [a] -> [a] -> SDoc -> Maybe SDoc
checkListBy DataCon -> DataCon -> Maybe SDoc
eqCon (AlgTyConRhs -> [DataCon]
data_cons AlgTyConRhs
tc1) (AlgTyConRhs -> [DataCon]
data_cons AlgTyConRhs
tc2) (String -> SDoc
text String
"constructors")
    eqAlgRhs p
_  tc1 :: AlgTyConRhs
tc1@NewTyCon{} tc2 :: AlgTyConRhs
tc2@NewTyCon{} =
        DataCon -> DataCon -> Maybe SDoc
eqCon (AlgTyConRhs -> DataCon
data_con AlgTyConRhs
tc1) (AlgTyConRhs -> DataCon
data_con AlgTyConRhs
tc2)
    eqAlgRhs p
_ AlgTyConRhs
_ AlgTyConRhs
_ = forall a. a -> Maybe a
Just (String -> SDoc
text String
"Cannot match a" SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (String -> SDoc
text String
"data") SDoc -> SDoc -> SDoc
<+>
                           String -> SDoc
text String
"definition with a" SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (String -> SDoc
text String
"newtype") SDoc -> SDoc -> SDoc
<+>
                           String -> SDoc
text String
"definition")

    eqCon :: DataCon -> DataCon -> Maybe SDoc
eqCon DataCon
c1 DataCon
c2
      =  Bool -> SDoc -> Maybe SDoc
check (Name
name1 forall a. Eq a => a -> a -> Bool
== Name
name2)
               (String -> SDoc
text String
"The names" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"and" SDoc -> SDoc -> SDoc
<+> SDoc
pname2 SDoc -> SDoc -> SDoc
<+>
                String -> SDoc
text String
"differ") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
         Bool -> SDoc -> Maybe SDoc
check (DataCon -> Bool
dataConIsInfix DataCon
c1 forall a. Eq a => a -> a -> Bool
== DataCon -> Bool
dataConIsInfix DataCon
c2)
               (String -> SDoc
text String
"The fixities of" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+>
                String -> SDoc
text String
"differ") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
         Bool -> SDoc -> Maybe SDoc
check (forall a. (a -> a -> Bool) -> [a] -> [a] -> Bool
eqListBy HsImplBang -> HsImplBang -> Bool
eqHsBang (DataCon -> [HsImplBang]
dataConImplBangs DataCon
c1) (DataCon -> [HsImplBang]
dataConImplBangs DataCon
c2))
               (String -> SDoc
text String
"The strictness annotations for" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+>
                String -> SDoc
text String
"differ") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
         Bool -> SDoc -> Maybe SDoc
check (forall a b. (a -> b) -> [a] -> [b]
map FieldLabel -> Name
flSelector (DataCon -> [FieldLabel]
dataConFieldLabels DataCon
c1) forall a. Eq a => a -> a -> Bool
== forall a b. (a -> b) -> [a] -> [b]
map FieldLabel -> Name
flSelector (DataCon -> [FieldLabel]
dataConFieldLabels DataCon
c2))
               (String -> SDoc
text String
"The record label lists for" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+>
                String -> SDoc
text String
"differ") Maybe SDoc -> Maybe SDoc -> Maybe SDoc
`andThenCheck`
         Bool -> SDoc -> Maybe SDoc
check (Type -> Type -> Bool
eqType (DataCon -> Type
dataConWrapperType DataCon
c1) (DataCon -> Type
dataConWrapperType DataCon
c2))
               (String -> SDoc
text String
"The types for" SDoc -> SDoc -> SDoc
<+> SDoc
pname1 SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"differ")
      where
        name1 :: Name
name1 = DataCon -> Name
dataConName DataCon
c1
        name2 :: Name
name2 = DataCon -> Name
dataConName DataCon
c2
        pname1 :: SDoc
pname1 = SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Name
name1)
        pname2 :: SDoc
pname2 = SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Name
name2)

    eqClosedFamilyAx :: Maybe (CoAxiom br) -> Maybe (CoAxiom br) -> Bool
eqClosedFamilyAx Maybe (CoAxiom br)
Nothing Maybe (CoAxiom br)
Nothing  = Bool
True
    eqClosedFamilyAx Maybe (CoAxiom br)
Nothing (Just CoAxiom br
_) = Bool
False
    eqClosedFamilyAx (Just CoAxiom br
_) Maybe (CoAxiom br)
Nothing = Bool
False
    eqClosedFamilyAx (Just (CoAxiom { co_ax_branches :: forall (br :: BranchFlag). CoAxiom br -> Branches br
co_ax_branches = Branches br
branches1 }))
                     (Just (CoAxiom { co_ax_branches :: forall (br :: BranchFlag). CoAxiom br -> Branches br
co_ax_branches = Branches br
branches2 }))
      =  forall (br :: BranchFlag). Branches br -> Arity
numBranches Branches br
branches1 forall a. Eq a => a -> a -> Bool
== forall (br :: BranchFlag). Branches br -> Arity
numBranches Branches br
branches2
      Bool -> Bool -> Bool
&& (forall (t :: * -> *). Foldable t => t Bool -> Bool
and forall a b. (a -> b) -> a -> b
$ forall a b c. (a -> b -> c) -> [a] -> [b] -> [c]
zipWith CoAxBranch -> CoAxBranch -> Bool
eqClosedFamilyBranch [CoAxBranch]
branch_list1 [CoAxBranch]
branch_list2)
      where
        branch_list1 :: [CoAxBranch]
branch_list1 = forall (br :: BranchFlag). Branches br -> [CoAxBranch]
fromBranches Branches br
branches1
        branch_list2 :: [CoAxBranch]
branch_list2 = forall (br :: BranchFlag). Branches br -> [CoAxBranch]
fromBranches Branches br
branches2

    eqClosedFamilyBranch :: CoAxBranch -> CoAxBranch -> Bool
eqClosedFamilyBranch (CoAxBranch { cab_tvs :: CoAxBranch -> [Var]
cab_tvs = [Var]
tvs1, cab_cvs :: CoAxBranch -> [Var]
cab_cvs = [Var]
cvs1
                                     , cab_lhs :: CoAxBranch -> [Type]
cab_lhs = [Type]
lhs1, cab_rhs :: CoAxBranch -> Type
cab_rhs = Type
rhs1 })
                         (CoAxBranch { cab_tvs :: CoAxBranch -> [Var]
cab_tvs = [Var]
tvs2, cab_cvs :: CoAxBranch -> [Var]
cab_cvs = [Var]
cvs2
                                     , cab_lhs :: CoAxBranch -> [Type]
cab_lhs = [Type]
lhs2, cab_rhs :: CoAxBranch -> Type
cab_rhs = Type
rhs2 })
      | Just RnEnv2
env1 <- RnEnv2 -> [Var] -> [Var] -> Maybe RnEnv2
eqVarBndrs RnEnv2
emptyRnEnv2 [Var]
tvs1 [Var]
tvs2
      , Just RnEnv2
env  <- RnEnv2 -> [Var] -> [Var] -> Maybe RnEnv2
eqVarBndrs RnEnv2
env1        [Var]
cvs1 [Var]
cvs2
      = forall a. (a -> a -> Bool) -> [a] -> [a] -> Bool
eqListBy (RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env) [Type]
lhs1 [Type]
lhs2 Bool -> Bool -> Bool
&&
        RnEnv2 -> Type -> Type -> Bool
eqTypeX RnEnv2
env Type
rhs1 Type
rhs2

      | Bool
otherwise = Bool
False

emptyRnEnv2 :: RnEnv2
emptyRnEnv2 :: RnEnv2
emptyRnEnv2 = InScopeSet -> RnEnv2
mkRnEnv2 InScopeSet
emptyInScopeSet

----------------
missingBootThing :: Bool -> Name -> String -> SDoc
missingBootThing :: Bool -> Name -> String -> SDoc
missingBootThing Bool
is_boot Name
name String
what
  = SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Name
name) SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"is exported by the"
    SDoc -> SDoc -> SDoc
<+> (if Bool
is_boot then String -> SDoc
text String
"hs-boot" else String -> SDoc
text String
"hsig")
    SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"file, but not"
    SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
what SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"the module"

badReexportedBootThing :: Bool -> Name -> Name -> SDoc
badReexportedBootThing :: Bool -> Name -> Name -> SDoc
badReexportedBootThing Bool
is_boot Name
name Name
name'
  = PrintUnqualified -> Depth -> SDoc -> SDoc
withUserStyle PrintUnqualified
alwaysQualify Depth
AllTheWay forall a b. (a -> b) -> a -> b
$ [SDoc] -> SDoc
vcat
        [ String -> SDoc
text String
"The" SDoc -> SDoc -> SDoc
<+> (if Bool
is_boot then String -> SDoc
text String
"hs-boot" else String -> SDoc
text String
"hsig")
           SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"file (re)exports" SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Name
name)
        , String -> SDoc
text String
"but the implementing module exports a different identifier" SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Name
name')
        ]

bootMisMatch :: Bool -> SDoc -> TyThing -> TyThing -> SDoc
bootMisMatch :: Bool -> SDoc -> TyThing -> TyThing -> SDoc
bootMisMatch Bool
is_boot SDoc
extra_info TyThing
real_thing TyThing
boot_thing
  = Bool -> SDoc -> TyThing -> SDoc -> SDoc -> SDoc
pprBootMisMatch Bool
is_boot SDoc
extra_info TyThing
real_thing SDoc
real_doc SDoc
boot_doc
  where
    to_doc :: TyThing -> SDoc
to_doc
      = ShowSub -> TyThing -> SDoc
pprTyThingInContext forall a b. (a -> b) -> a -> b
$ ShowSub
showToHeader { ss_forall :: ShowForAllFlag
ss_forall =
                                              if Bool
is_boot
                                                then ShowForAllFlag
ShowForAllMust
                                                else ShowForAllFlag
ShowForAllWhen }

    real_doc :: SDoc
real_doc = TyThing -> SDoc
to_doc TyThing
real_thing
    boot_doc :: SDoc
boot_doc = TyThing -> SDoc
to_doc TyThing
boot_thing

    pprBootMisMatch :: Bool -> SDoc -> TyThing -> SDoc -> SDoc -> SDoc
    pprBootMisMatch :: Bool -> SDoc -> TyThing -> SDoc -> SDoc -> SDoc
pprBootMisMatch Bool
is_boot SDoc
extra_info TyThing
real_thing SDoc
real_doc SDoc
boot_doc
      = [SDoc] -> SDoc
vcat
          [ forall a. Outputable a => a -> SDoc
ppr TyThing
real_thing SDoc -> SDoc -> SDoc
<+>
            String -> SDoc
text String
"has conflicting definitions in the module",
            String -> SDoc
text String
"and its" SDoc -> SDoc -> SDoc
<+>
              (if Bool
is_boot
                then String -> SDoc
text String
"hs-boot file"
                else String -> SDoc
text String
"hsig file"),
            String -> SDoc
text String
"Main module:" SDoc -> SDoc -> SDoc
<+> SDoc
real_doc,
              (if Bool
is_boot
                then String -> SDoc
text String
"Boot file:  "
                else String -> SDoc
text String
"Hsig file: ")
                SDoc -> SDoc -> SDoc
<+> SDoc
boot_doc,
            SDoc
extra_info
          ]

instMisMatch :: DFunId -> SDoc
instMisMatch :: Var -> SDoc
instMisMatch Var
dfun
  = SDoc -> Arity -> SDoc -> SDoc
hang (String -> SDoc
text String
"instance" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr (Var -> Type
idType Var
dfun))
       Arity
2 (String -> SDoc
text String
"is defined in the hs-boot file, but not in the module itself")

{-
************************************************************************
*                                                                      *
        Type-checking the top level of a module (continued)
*                                                                      *
************************************************************************
-}

rnTopSrcDecls :: HsGroup GhcPs -> TcM (TcGblEnv, HsGroup GhcRn)
-- Fails if there are any errors
rnTopSrcDecls :: HsGroup GhcPs -> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
rnTopSrcDecls HsGroup GhcPs
group
 = do { -- Rename the source decls
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn12" SDoc
empty ;
        (TcGblEnv
tcg_env, HsGroup (GhcPass 'Renamed)
rn_decls) <- forall r. TcM r -> TcM r
checkNoErrs forall a b. (a -> b) -> a -> b
$ HsGroup GhcPs -> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
rnSrcDecls HsGroup GhcPs
group ;
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn13" SDoc
empty ;
        (TcGblEnv
tcg_env, HsGroup (GhcPass 'Renamed)
rn_decls) <- TcGblEnv
-> HsGroup (GhcPass 'Renamed)
-> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
runRenamerPlugin TcGblEnv
tcg_env HsGroup (GhcPass 'Renamed)
rn_decls ;
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"rn13-plugin" SDoc
empty ;

        -- save the renamed syntax, if we want it
        let { tcg_env' :: TcGblEnv
tcg_env'
                | Just HsGroup (GhcPass 'Renamed)
grp <- TcGblEnv -> Maybe (HsGroup (GhcPass 'Renamed))
tcg_rn_decls TcGblEnv
tcg_env
                  = TcGblEnv
tcg_env{ tcg_rn_decls :: Maybe (HsGroup (GhcPass 'Renamed))
tcg_rn_decls = forall a. a -> Maybe a
Just (forall (p :: Pass).
HsGroup (GhcPass p) -> HsGroup (GhcPass p) -> HsGroup (GhcPass p)
appendGroups HsGroup (GhcPass 'Renamed)
grp HsGroup (GhcPass 'Renamed)
rn_decls) }
                | Bool
otherwise
                   = TcGblEnv
tcg_env };

                -- Dump trace of renaming part
        forall a.
(Outputable a, Data a) =>
a -> TcRnIf TcGblEnv TcLclEnv ()
rnDump HsGroup (GhcPass 'Renamed)
rn_decls ;
        forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env', HsGroup (GhcPass 'Renamed)
rn_decls)
   }

tcTopSrcDecls :: HsGroup GhcRn -> TcM (TcGblEnv, TcLclEnv)
tcTopSrcDecls :: HsGroup (GhcPass 'Renamed) -> TcM (TcGblEnv, TcLclEnv)
tcTopSrcDecls (HsGroup { hs_tyclds :: forall p. HsGroup p -> [TyClGroup p]
hs_tyclds = [TyClGroup (GhcPass 'Renamed)]
tycl_decls,
                         hs_derivds :: forall p. HsGroup p -> [LDerivDecl p]
hs_derivds = [LDerivDecl (GhcPass 'Renamed)]
deriv_decls,
                         hs_fords :: forall p. HsGroup p -> [LForeignDecl p]
hs_fords  = [LForeignDecl (GhcPass 'Renamed)]
foreign_decls,
                         hs_defds :: forall p. HsGroup p -> [LDefaultDecl p]
hs_defds  = [LDefaultDecl (GhcPass 'Renamed)]
default_decls,
                         hs_annds :: forall p. HsGroup p -> [LAnnDecl p]
hs_annds  = [LAnnDecl (GhcPass 'Renamed)]
annotation_decls,
                         hs_ruleds :: forall p. HsGroup p -> [LRuleDecls p]
hs_ruleds = [LRuleDecls (GhcPass 'Renamed)]
rule_decls,
                         hs_valds :: forall p. HsGroup p -> HsValBinds p
hs_valds  = hs_val_binds :: HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed)
hs_val_binds@(XValBindsLR
                                              (NValBinds [(RecFlag, LHsBinds (GhcPass 'Renamed))]
val_binds [LSig (GhcPass 'Renamed)]
val_sigs)) })
 = do {         -- Type-check the type and class decls, and all imported decls
                -- The latter come in via tycl_decls
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc2 (src)" SDoc
empty ;

                -- Source-language instances, including derivings,
                -- and import the supporting declarations
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc3" SDoc
empty ;
        (TcGblEnv
tcg_env, [InstInfo (GhcPass 'Renamed)]
inst_infos, XValBindsLR (NValBinds [(RecFlag, LHsBinds (GhcPass 'Renamed))]
deriv_binds [LSig (GhcPass 'Renamed)]
deriv_sigs))
            <- [TyClGroup (GhcPass 'Renamed)]
-> [LDerivDecl (GhcPass 'Renamed)]
-> [(RecFlag, LHsBinds (GhcPass 'Renamed))]
-> TcM
     (TcGblEnv, [InstInfo (GhcPass 'Renamed)],
      HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed))
tcTyClsInstDecls [TyClGroup (GhcPass 'Renamed)]
tycl_decls [LDerivDecl (GhcPass 'Renamed)]
deriv_decls [(RecFlag, LHsBinds (GhcPass 'Renamed))]
val_binds ;

        forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env       forall a b. (a -> b) -> a -> b
$ do {

                -- Generate Applicative/Monad proposal (AMP) warnings
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc3b" SDoc
empty ;

                -- Generate Semigroup/Monoid warnings
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc3c" SDoc
empty ;
        TcRnIf TcGblEnv TcLclEnv ()
tcSemigroupWarnings ;

                -- Foreign import declarations next.
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc4" SDoc
empty ;
        ([Var]
fi_ids, [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
fi_decls, Bag GlobalRdrElt
fi_gres) <- [LForeignDecl (GhcPass 'Renamed)]
-> TcM ([Var], [LForeignDecl GhcTc], Bag GlobalRdrElt)
tcForeignImports [LForeignDecl (GhcPass 'Renamed)]
foreign_decls ;
        forall a. [Var] -> TcM a -> TcM a
tcExtendGlobalValEnv [Var]
fi_ids     forall a b. (a -> b) -> a -> b
$ do {

                -- Default declarations
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc4a" SDoc
empty ;
        Maybe [Type]
default_tys <- [LDefaultDecl (GhcPass 'Renamed)] -> TcM (Maybe [Type])
tcDefaults [LDefaultDecl (GhcPass 'Renamed)]
default_decls ;
        forall gbl lcl a.
(gbl -> gbl) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updGblEnv (\TcGblEnv
gbl -> TcGblEnv
gbl { tcg_default :: Maybe [Type]
tcg_default = Maybe [Type]
default_tys }) forall a b. (a -> b) -> a -> b
$ do {

                -- Value declarations next.
                -- It is important that we check the top-level value bindings
                -- before the GHC-generated derived bindings, since the latter
                -- may be defined in terms of the former. (For instance,
                -- the bindings produced in a Data instance.)
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc5" SDoc
empty ;
        (TcGblEnv, TcLclEnv)
tc_envs <- [(RecFlag, LHsBinds (GhcPass 'Renamed))]
-> [LSig (GhcPass 'Renamed)] -> TcM (TcGblEnv, TcLclEnv)
tcTopBinds [(RecFlag, LHsBinds (GhcPass 'Renamed))]
val_binds [LSig (GhcPass 'Renamed)]
val_sigs;
        forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv, TcLclEnv)
tc_envs forall a b. (a -> b) -> a -> b
$ do {

                -- Now GHC-generated derived bindings, generics, and selectors
                -- Do not generate warnings from compiler-generated code;
                -- hence the use of discardWarnings
        tc_envs :: (TcGblEnv, TcLclEnv)
tc_envs@(TcGblEnv
tcg_env, TcLclEnv
tcl_env)
            <- forall r. TcM r -> TcM r
discardWarnings ([(RecFlag, LHsBinds (GhcPass 'Renamed))]
-> [LSig (GhcPass 'Renamed)] -> TcM (TcGblEnv, TcLclEnv)
tcTopBinds [(RecFlag, LHsBinds (GhcPass 'Renamed))]
deriv_binds [LSig (GhcPass 'Renamed)]
deriv_sigs) ;
        forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv, TcLclEnv)
tc_envs forall a b. (a -> b) -> a -> b
$ do {  -- Environment doesn't change now

                -- Second pass over class and instance declarations,
                -- now using the kind-checked decls
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc6" SDoc
empty ;
        Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
inst_binds <- [LTyClDecl (GhcPass 'Renamed)]
-> [InstInfo (GhcPass 'Renamed)] -> TcM (LHsBinds GhcTc)
tcInstDecls2 (forall pass. [TyClGroup pass] -> [LTyClDecl pass]
tyClGroupTyClDecls [TyClGroup (GhcPass 'Renamed)]
tycl_decls) [InstInfo (GhcPass 'Renamed)]
inst_infos ;

                -- Foreign exports
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc7" SDoc
empty ;
        (Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
foe_binds, [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
foe_decls, Bag GlobalRdrElt
foe_gres) <- [LForeignDecl (GhcPass 'Renamed)]
-> TcM (LHsBinds GhcTc, [LForeignDecl GhcTc], Bag GlobalRdrElt)
tcForeignExports [LForeignDecl (GhcPass 'Renamed)]
foreign_decls ;

                -- Annotations
        [Annotation]
annotations <- [LAnnDecl (GhcPass 'Renamed)] -> TcM [Annotation]
tcAnnotations [LAnnDecl (GhcPass 'Renamed)]
annotation_decls ;

                -- Rules
        [GenLocated SrcSpanAnnA (RuleDecls GhcTc)]
rules <- [LRuleDecls (GhcPass 'Renamed)] -> TcM [LRuleDecls GhcTc]
tcRules [LRuleDecls (GhcPass 'Renamed)]
rule_decls ;

                -- Wrap up
        String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"Tc7a" SDoc
empty ;
        let { all_binds :: Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
all_binds = Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
inst_binds     forall a. Bag a -> Bag a -> Bag a
`unionBags`
                          Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
foe_binds

            ; fo_gres :: Bag GlobalRdrElt
fo_gres = Bag GlobalRdrElt
fi_gres forall a. Bag a -> Bag a -> Bag a
`unionBags` Bag GlobalRdrElt
foe_gres
            ; fo_fvs :: FreeVars
fo_fvs = forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr (\GlobalRdrElt
gre FreeVars
fvs -> FreeVars
fvs FreeVars -> Name -> FreeVars
`addOneFV` GlobalRdrElt -> Name
greMangledName GlobalRdrElt
gre)
                                FreeVars
emptyFVs Bag GlobalRdrElt
fo_gres

            ; sig_names :: FreeVars
sig_names = [Name] -> FreeVars
mkNameSet (forall (idL :: Pass) (idR :: Pass).
CollectPass (GhcPass idL) =>
CollectFlag (GhcPass idL)
-> HsValBindsLR (GhcPass idL) (GhcPass idR) -> [IdP (GhcPass idL)]
collectHsValBinders forall p. CollectFlag p
CollNoDictBinders HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed)
hs_val_binds)
                          FreeVars -> FreeVars -> FreeVars
`minusNameSet` [LSig (GhcPass 'Renamed)] -> FreeVars
getTypeSigNames [LSig (GhcPass 'Renamed)]
val_sigs

                -- Extend the GblEnv with the (as yet un-zonked)
                -- bindings, rules, foreign decls
            ; tcg_env' :: TcGblEnv
tcg_env' = TcGblEnv
tcg_env { tcg_binds :: LHsBinds GhcTc
tcg_binds   = TcGblEnv -> LHsBinds GhcTc
tcg_binds TcGblEnv
tcg_env forall a. Bag a -> Bag a -> Bag a
`unionBags` Bag (GenLocated SrcSpanAnnA (HsBindLR GhcTc GhcTc))
all_binds
                                 , tcg_sigs :: FreeVars
tcg_sigs    = TcGblEnv -> FreeVars
tcg_sigs TcGblEnv
tcg_env FreeVars -> FreeVars -> FreeVars
`unionNameSet` FreeVars
sig_names
                                 , tcg_rules :: [LRuleDecl GhcTc]
tcg_rules   = TcGblEnv -> [LRuleDecl GhcTc]
tcg_rules TcGblEnv
tcg_env
                                                      forall a. [a] -> [a] -> [a]
++ forall (p :: Pass).
[LRuleDecls (GhcPass p)] -> [LRuleDecl (GhcPass p)]
flattenRuleDecls [GenLocated SrcSpanAnnA (RuleDecls GhcTc)]
rules
                                 , tcg_anns :: [Annotation]
tcg_anns    = TcGblEnv -> [Annotation]
tcg_anns TcGblEnv
tcg_env forall a. [a] -> [a] -> [a]
++ [Annotation]
annotations
                                 , tcg_ann_env :: AnnEnv
tcg_ann_env = AnnEnv -> [Annotation] -> AnnEnv
extendAnnEnvList (TcGblEnv -> AnnEnv
tcg_ann_env TcGblEnv
tcg_env) [Annotation]
annotations
                                 , tcg_fords :: [LForeignDecl GhcTc]
tcg_fords   = TcGblEnv -> [LForeignDecl GhcTc]
tcg_fords TcGblEnv
tcg_env forall a. [a] -> [a] -> [a]
++ [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
foe_decls forall a. [a] -> [a] -> [a]
++ [GenLocated SrcSpanAnnA (ForeignDecl GhcTc)]
fi_decls
                                 , tcg_dus :: DefUses
tcg_dus     = TcGblEnv -> DefUses
tcg_dus TcGblEnv
tcg_env DefUses -> DefUses -> DefUses
`plusDU` FreeVars -> DefUses
usesOnly FreeVars
fo_fvs } } ;
                                 -- tcg_dus: see Note [Newtype constructor usage in foreign declarations]

        -- See Note [Newtype constructor usage in foreign declarations]
        [GlobalRdrElt] -> TcRnIf TcGblEnv TcLclEnv ()
addUsedGREs (forall a. Bag a -> [a]
bagToList Bag GlobalRdrElt
fo_gres) ;

        forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env', TcLclEnv
tcl_env)
    }}}}}}

tcTopSrcDecls HsGroup (GhcPass 'Renamed)
_ = forall a. String -> a
panic String
"tcTopSrcDecls: ValBindsIn"


tcSemigroupWarnings :: TcM ()
tcSemigroupWarnings :: TcRnIf TcGblEnv TcLclEnv ()
tcSemigroupWarnings = do
    String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcSemigroupWarnings" SDoc
empty
    let warnFlag :: WarningFlag
warnFlag = WarningFlag
Opt_WarnSemigroup
    WarningFlag -> Name -> TcRnIf TcGblEnv TcLclEnv ()
tcPreludeClashWarn WarningFlag
warnFlag Name
sappendName
    WarningFlag -> Name -> Name -> TcRnIf TcGblEnv TcLclEnv ()
tcMissingParentClassWarn WarningFlag
warnFlag Name
monoidClassName Name
semigroupClassName


-- | Warn on local definitions of names that would clash with future Prelude
-- elements.
--
--   A name clashes if the following criteria are met:
--       1. It would is imported (unqualified) from Prelude
--       2. It is locally defined in the current module
--       3. It has the same literal name as the reference function
--       4. It is not identical to the reference function
tcPreludeClashWarn :: WarningFlag
                   -> Name
                   -> TcM ()
tcPreludeClashWarn :: WarningFlag -> Name -> TcRnIf TcGblEnv TcLclEnv ()
tcPreludeClashWarn WarningFlag
warnFlag Name
name = do
    { Bool
warn <- forall gbl lcl. WarningFlag -> TcRnIf gbl lcl Bool
woptM WarningFlag
warnFlag
    ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
warn forall a b. (a -> b) -> a -> b
$ do
    { String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcPreludeClashWarn/wouldBeImported" SDoc
empty
    -- Is the name imported (unqualified) from Prelude? (Point 4 above)
    ; [ImportDecl (GhcPass 'Renamed)]
rnImports <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (forall a b. (a -> b) -> [a] -> [b]
map forall l e. GenLocated l e -> e
unLoc forall b c a. (b -> c) -> (a -> b) -> a -> c
. TcGblEnv -> [LImportDecl (GhcPass 'Renamed)]
tcg_rn_imports) forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
    -- (Note that this automatically handles -XNoImplicitPrelude, as Prelude
    -- will not appear in rnImports automatically if it is set.)

    -- Continue only the name is imported from Prelude
    ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Name -> [ImportDecl (GhcPass 'Renamed)] -> Bool
importedViaPrelude Name
name [ImportDecl (GhcPass 'Renamed)]
rnImports) forall a b. (a -> b) -> a -> b
$ do
      -- Handle 2.-4.
    { [GlobalRdrElt]
rdrElts <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. OccEnv a -> [a]
occEnvElts forall b c a. (b -> c) -> (a -> b) -> a -> c
. TcGblEnv -> GlobalRdrEnv
tcg_rdr_env) forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv

    ; let clashes :: GlobalRdrElt -> Bool
          clashes :: GlobalRdrElt -> Bool
clashes GlobalRdrElt
x = Bool
isLocalDef Bool -> Bool -> Bool
&& Bool
nameClashes Bool -> Bool -> Bool
&& Bool
isNotInProperModule
            where
              isLocalDef :: Bool
isLocalDef = GlobalRdrElt -> Bool
gre_lcl GlobalRdrElt
x forall a. Eq a => a -> a -> Bool
== Bool
True
              -- Names are identical ...
              nameClashes :: Bool
nameClashes = Name -> OccName
nameOccName (GlobalRdrElt -> Name
greMangledName GlobalRdrElt
x) forall a. Eq a => a -> a -> Bool
== Name -> OccName
nameOccName Name
name
              -- ... but not the actual definitions, because we don't want to
              -- warn about a bad definition of e.g. <> in Data.Semigroup, which
              -- is the (only) proper place where this should be defined
              isNotInProperModule :: Bool
isNotInProperModule = GlobalRdrElt -> Name
greMangledName GlobalRdrElt
x forall a. Eq a => a -> a -> Bool
/= Name
name

          -- List of all offending definitions
          clashingElts :: [GlobalRdrElt]
          clashingElts :: [GlobalRdrElt]
clashingElts = forall a. (a -> Bool) -> [a] -> [a]
filter GlobalRdrElt -> Bool
clashes [GlobalRdrElt]
rdrElts

    ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcPreludeClashWarn/prelude_functions"
                (SDoc -> Arity -> SDoc -> SDoc
hang (forall a. Outputable a => a -> SDoc
ppr Name
name) Arity
4 ([SDoc] -> SDoc
sep [forall a. Outputable a => a -> SDoc
ppr [GlobalRdrElt]
clashingElts]))

    ; let warn_msg :: GlobalRdrElt -> TcRnIf TcGblEnv TcLclEnv ()
warn_msg GlobalRdrElt
x = WarnReason -> SrcSpan -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addWarnAt (WarningFlag -> WarnReason
Reason WarningFlag
warnFlag) (Name -> SrcSpan
nameSrcSpan (GlobalRdrElt -> Name
greMangledName GlobalRdrElt
x)) ([SDoc] -> SDoc
hsep
              [ String -> SDoc
text String
"Local definition of"
              , (SDoc -> SDoc
quotes forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Outputable a => a -> SDoc
ppr forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> OccName
nameOccName forall b c a. (b -> c) -> (a -> b) -> a -> c
. GlobalRdrElt -> Name
greMangledName) GlobalRdrElt
x
              , String -> SDoc
text String
"clashes with a future Prelude name." ]
              SDoc -> SDoc -> SDoc
$$
              String -> SDoc
text String
"This will become an error in a future release." )
    ; forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ GlobalRdrElt -> TcRnIf TcGblEnv TcLclEnv ()
warn_msg [GlobalRdrElt]
clashingElts
    }}}

  where

    -- Is the given name imported via Prelude?
    --
    -- Possible scenarios:
    --   a) Prelude is imported implicitly, issue warnings.
    --   b) Prelude is imported explicitly, but without mentioning the name in
    --      question. Issue no warnings.
    --   c) Prelude is imported hiding the name in question. Issue no warnings.
    --   d) Qualified import of Prelude, no warnings.
    importedViaPrelude :: Name
                       -> [ImportDecl GhcRn]
                       -> Bool
    importedViaPrelude :: Name -> [ImportDecl (GhcPass 'Renamed)] -> Bool
importedViaPrelude Name
name = forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
any ImportDecl (GhcPass 'Renamed) -> Bool
importViaPrelude
      where
        isPrelude :: ImportDecl GhcRn -> Bool
        isPrelude :: ImportDecl (GhcPass 'Renamed) -> Bool
isPrelude ImportDecl (GhcPass 'Renamed)
imp = forall l e. GenLocated l e -> e
unLoc (forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName ImportDecl (GhcPass 'Renamed)
imp) forall a. Eq a => a -> a -> Bool
== ModuleName
pRELUDE_NAME

        -- Implicit (Prelude) import?
        isImplicit :: ImportDecl GhcRn -> Bool
        isImplicit :: ImportDecl (GhcPass 'Renamed) -> Bool
isImplicit = forall pass. ImportDecl pass -> Bool
ideclImplicit

        -- Unqualified import?
        isUnqualified :: ImportDecl GhcRn -> Bool
        isUnqualified :: ImportDecl (GhcPass 'Renamed) -> Bool
isUnqualified = Bool -> Bool
not forall b c a. (b -> c) -> (a -> b) -> a -> c
. ImportDeclQualifiedStyle -> Bool
isImportDeclQualified forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall pass. ImportDecl pass -> ImportDeclQualifiedStyle
ideclQualified

        -- List of explicitly imported (or hidden) Names from a single import.
        --   Nothing -> No explicit imports
        --   Just (False, <names>) -> Explicit import list of <names>
        --   Just (True , <names>) -> Explicit hiding of <names>
        importListOf :: ImportDecl GhcRn -> Maybe (Bool, [Name])
        importListOf :: ImportDecl (GhcPass 'Renamed) -> Maybe (Bool, [Name])
importListOf = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap forall {a} {l} {l} {p :: Pass}.
(a, GenLocated l [GenLocated l (IE (GhcPass p))])
-> (a, [IdGhcP p])
toImportList forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall pass. ImportDecl pass -> Maybe (Bool, XRec pass [LIE pass])
ideclHiding
          where
            toImportList :: (a, GenLocated l [GenLocated l (IE (GhcPass p))])
-> (a, [IdGhcP p])
toImportList (a
h, GenLocated l [GenLocated l (IE (GhcPass p))]
loc) = (a
h, forall a b. (a -> b) -> [a] -> [b]
map (forall (p :: Pass). IE (GhcPass p) -> IdP (GhcPass p)
ieName forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall l e. GenLocated l e -> e
unLoc) (forall l e. GenLocated l e -> e
unLoc GenLocated l [GenLocated l (IE (GhcPass p))]
loc))

        isExplicit :: ImportDecl GhcRn -> Bool
        isExplicit :: ImportDecl (GhcPass 'Renamed) -> Bool
isExplicit ImportDecl (GhcPass 'Renamed)
x = case ImportDecl (GhcPass 'Renamed) -> Maybe (Bool, [Name])
importListOf ImportDecl (GhcPass 'Renamed)
x of
            Maybe (Bool, [Name])
Nothing -> Bool
False
            Just (Bool
False, [Name]
explicit)
                -> Name -> OccName
nameOccName Name
name forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem`    forall a b. (a -> b) -> [a] -> [b]
map Name -> OccName
nameOccName [Name]
explicit
            Just (Bool
True, [Name]
hidden)
                -> Name -> OccName
nameOccName Name
name forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`notElem` forall a b. (a -> b) -> [a] -> [b]
map Name -> OccName
nameOccName [Name]
hidden

        -- Check whether the given name would be imported (unqualified) from
        -- an import declaration.
        importViaPrelude :: ImportDecl GhcRn -> Bool
        importViaPrelude :: ImportDecl (GhcPass 'Renamed) -> Bool
importViaPrelude ImportDecl (GhcPass 'Renamed)
x = ImportDecl (GhcPass 'Renamed) -> Bool
isPrelude ImportDecl (GhcPass 'Renamed)
x
                          Bool -> Bool -> Bool
&& ImportDecl (GhcPass 'Renamed) -> Bool
isUnqualified ImportDecl (GhcPass 'Renamed)
x
                          Bool -> Bool -> Bool
&& (ImportDecl (GhcPass 'Renamed) -> Bool
isImplicit ImportDecl (GhcPass 'Renamed)
x Bool -> Bool -> Bool
|| ImportDecl (GhcPass 'Renamed) -> Bool
isExplicit ImportDecl (GhcPass 'Renamed)
x)


-- Notation: is* is for classes the type is an instance of, should* for those
--           that it should also be an instance of based on the corresponding
--           is*.
tcMissingParentClassWarn :: WarningFlag
                         -> Name -- ^ Instances of this ...
                         -> Name -- ^ should also be instances of this
                         -> TcM ()
tcMissingParentClassWarn :: WarningFlag -> Name -> Name -> TcRnIf TcGblEnv TcLclEnv ()
tcMissingParentClassWarn WarningFlag
warnFlag Name
isName Name
shouldName
  = do { Bool
warn <- forall gbl lcl. WarningFlag -> TcRnIf gbl lcl Bool
woptM WarningFlag
warnFlag
       ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
warn forall a b. (a -> b) -> a -> b
$ do
       { String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcMissingParentClassWarn" SDoc
empty
       ; Maybe Class
isClass'     <- Name -> TcM (Maybe Class)
tcLookupClass_maybe Name
isName
       ; Maybe Class
shouldClass' <- Name -> TcM (Maybe Class)
tcLookupClass_maybe Name
shouldName
       ; case (Maybe Class
isClass', Maybe Class
shouldClass') of
              (Just Class
isClass, Just Class
shouldClass) -> do
                  { [ClsInst]
localInstances <- TcM [ClsInst]
tcGetInsts
                  ; let isInstance :: ClsInst -> Bool
isInstance ClsInst
m = ClsInst -> Class
is_cls ClsInst
m forall a. Eq a => a -> a -> Bool
== Class
isClass
                        isInsts :: [ClsInst]
isInsts = forall a. (a -> Bool) -> [a] -> [a]
filter ClsInst -> Bool
isInstance [ClsInst]
localInstances
                  ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcMissingParentClassWarn/isInsts" (forall a. Outputable a => a -> SDoc
ppr [ClsInst]
isInsts)
                  ; forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
t a -> (a -> m b) -> m ()
forM_ [ClsInst]
isInsts (Class -> Class -> ClsInst -> TcRnIf TcGblEnv TcLclEnv ()
checkShouldInst Class
isClass Class
shouldClass)
                  }
              (Maybe Class
is',Maybe Class
should') ->
                  String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcMissingParentClassWarn/notIsShould"
                          (SDoc -> Arity -> SDoc -> SDoc
hang (forall a. Outputable a => a -> SDoc
ppr Name
isName SDoc -> SDoc -> SDoc
<> String -> SDoc
text String
"/" SDoc -> SDoc -> SDoc
<> forall a. Outputable a => a -> SDoc
ppr Name
shouldName) Arity
2 (
                            ([SDoc] -> SDoc
hsep [ SDoc -> SDoc
quotes (String -> SDoc
text String
"Is"), String -> SDoc
text String
"lookup for"
                                  , forall a. Outputable a => a -> SDoc
ppr Name
isName
                                  , String -> SDoc
text String
"resulted in", forall a. Outputable a => a -> SDoc
ppr Maybe Class
is' ])
                            SDoc -> SDoc -> SDoc
$$
                            ([SDoc] -> SDoc
hsep [ SDoc -> SDoc
quotes (String -> SDoc
text String
"Should"), String -> SDoc
text String
"lookup for"
                                  , forall a. Outputable a => a -> SDoc
ppr Name
shouldName
                                  , String -> SDoc
text String
"resulted in", forall a. Outputable a => a -> SDoc
ppr Maybe Class
should' ])))
       }}
  where
    -- Check whether the desired superclass exists in a given environment.
    checkShouldInst :: Class   -- ^ Class of existing instance
                    -> Class   -- ^ Class there should be an instance of
                    -> ClsInst -- ^ Existing instance
                    -> TcM ()
    checkShouldInst :: Class -> Class -> ClsInst -> TcRnIf TcGblEnv TcLclEnv ()
checkShouldInst Class
isClass Class
shouldClass ClsInst
isInst
      = do { InstEnvs
instEnv <- TcM InstEnvs
tcGetInstEnvs
           ; let ([InstMatch]
instanceMatches, [ClsInst]
shouldInsts, [InstMatch]
_)
                    = Bool
-> InstEnvs
-> Class
-> [Type]
-> ([InstMatch], [ClsInst], [InstMatch])
lookupInstEnv Bool
False InstEnvs
instEnv Class
shouldClass (ClsInst -> [Type]
is_tys ClsInst
isInst)

           ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcMissingParentClassWarn/checkShouldInst"
                     (SDoc -> Arity -> SDoc -> SDoc
hang (forall a. Outputable a => a -> SDoc
ppr ClsInst
isInst) Arity
4
                         ([SDoc] -> SDoc
sep [forall a. Outputable a => a -> SDoc
ppr [InstMatch]
instanceMatches, forall a. Outputable a => a -> SDoc
ppr [ClsInst]
shouldInsts]))

           -- "<location>: Warning: <type> is an instance of <is> but not
           -- <should>" e.g. "Foo is an instance of Monad but not Applicative"
           ; let instLoc :: SrcSpan
instLoc = SrcLoc -> SrcSpan
srcLocSpan forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> SrcLoc
nameSrcLoc forall a b. (a -> b) -> a -> b
$ forall a. NamedThing a => a -> Name
getName ClsInst
isInst
                 warnMsg :: [RoughMatchTc] -> TcRnIf TcGblEnv TcLclEnv ()
warnMsg (KnownTc Name
name:[RoughMatchTc]
_) =
                      WarnReason -> SrcSpan -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addWarnAt (WarningFlag -> WarnReason
Reason WarningFlag
warnFlag) SrcSpan
instLoc forall a b. (a -> b) -> a -> b
$
                           [SDoc] -> SDoc
hsep [ (SDoc -> SDoc
quotes forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Outputable a => a -> SDoc
ppr forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> OccName
nameOccName) Name
name
                                , String -> SDoc
text String
"is an instance of"
                                , (forall a. Outputable a => a -> SDoc
ppr forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> OccName
nameOccName forall b c a. (b -> c) -> (a -> b) -> a -> c
. Class -> Name
className) Class
isClass
                                , String -> SDoc
text String
"but not"
                                , (forall a. Outputable a => a -> SDoc
ppr forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> OccName
nameOccName forall b c a. (b -> c) -> (a -> b) -> a -> c
. Class -> Name
className) Class
shouldClass ]
                                SDoc -> SDoc -> SDoc
<> String -> SDoc
text String
"."
                           SDoc -> SDoc -> SDoc
$$
                           [SDoc] -> SDoc
hsep [ String -> SDoc
text String
"This will become an error in"
                                , String -> SDoc
text String
"a future release." ]
                 warnMsg [RoughMatchTc]
_ = forall (f :: * -> *) a. Applicative f => a -> f a
pure ()
           ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [ClsInst]
shouldInsts Bool -> Bool -> Bool
&& forall (t :: * -> *) a. Foldable t => t a -> Bool
null [InstMatch]
instanceMatches) forall a b. (a -> b) -> a -> b
$
                  [RoughMatchTc] -> TcRnIf TcGblEnv TcLclEnv ()
warnMsg (ClsInst -> [RoughMatchTc]
is_tcs ClsInst
isInst)
           }

    tcLookupClass_maybe :: Name -> TcM (Maybe Class)
    tcLookupClass_maybe :: Name -> TcM (Maybe Class)
tcLookupClass_maybe Name
name = Name -> TcM (MaybeErr SDoc TyThing)
tcLookupImported_maybe Name
name forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \case
        Succeeded (ATyCon TyCon
tc) | cls :: Maybe Class
cls@(Just Class
_) <- TyCon -> Maybe Class
tyConClass_maybe TyCon
tc -> forall (f :: * -> *) a. Applicative f => a -> f a
pure Maybe Class
cls
        MaybeErr SDoc TyThing
_else -> forall (f :: * -> *) a. Applicative f => a -> f a
pure forall a. Maybe a
Nothing


---------------------------
tcTyClsInstDecls :: [TyClGroup GhcRn]
                 -> [LDerivDecl GhcRn]
                 -> [(RecFlag, LHsBinds GhcRn)]
                 -> TcM (TcGblEnv,            -- The full inst env
                         [InstInfo GhcRn],    -- Source-code instance decls to
                                              -- process; contains all dfuns for
                                              -- this module
                          HsValBinds GhcRn)   -- Supporting bindings for derived
                                              -- instances

tcTyClsInstDecls :: [TyClGroup (GhcPass 'Renamed)]
-> [LDerivDecl (GhcPass 'Renamed)]
-> [(RecFlag, LHsBinds (GhcPass 'Renamed))]
-> TcM
     (TcGblEnv, [InstInfo (GhcPass 'Renamed)],
      HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed))
tcTyClsInstDecls [TyClGroup (GhcPass 'Renamed)]
tycl_decls [LDerivDecl (GhcPass 'Renamed)]
deriv_decls [(RecFlag, LHsBinds (GhcPass 'Renamed))]
binds
 = forall a. [LInstDecl (GhcPass 'Renamed)] -> TcM a -> TcM a
tcAddDataFamConPlaceholders ([TyClGroup (GhcPass 'Renamed)]
tycl_decls forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= forall pass. TyClGroup pass -> [LInstDecl pass]
group_instds) forall a b. (a -> b) -> a -> b
$
   forall a.
[PatSynBind (GhcPass 'Renamed) (GhcPass 'Renamed)]
-> TcM a -> TcM a
tcAddPatSynPlaceholders (forall id.
UnXRec id =>
[(RecFlag, LHsBinds id)] -> [PatSynBind id id]
getPatSynBinds [(RecFlag, LHsBinds (GhcPass 'Renamed))]
binds) forall a b. (a -> b) -> a -> b
$
   do { (TcGblEnv
tcg_env, [InstInfo (GhcPass 'Renamed)]
inst_info, [DerivInfo]
deriv_info)
          <- [TyClGroup (GhcPass 'Renamed)]
-> TcM (TcGblEnv, [InstInfo (GhcPass 'Renamed)], [DerivInfo])
tcTyAndClassDecls [TyClGroup (GhcPass 'Renamed)]
tycl_decls ;
      ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env forall a b. (a -> b) -> a -> b
$ do {
          -- With the @TyClDecl@s and @InstDecl@s checked we're ready to
          -- process the deriving clauses, including data family deriving
          -- clauses discovered in @tcTyAndClassDecls@.
          --
          -- Careful to quit now in case there were instance errors, so that
          -- the deriving errors don't pile up as well.
          ; TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM
          ; (TcGblEnv
tcg_env', [InstInfo (GhcPass 'Renamed)]
inst_info', HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed)
val_binds)
              <- [DerivInfo]
-> [LDerivDecl (GhcPass 'Renamed)]
-> TcM
     (TcGblEnv, [InstInfo (GhcPass 'Renamed)],
      HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed))
tcInstDeclsDeriv [DerivInfo]
deriv_info [LDerivDecl (GhcPass 'Renamed)]
deriv_decls
          ; forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env' forall a b. (a -> b) -> a -> b
$ do {
                TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM
              ; forall (f :: * -> *) a. Applicative f => a -> f a
pure (TcGblEnv
tcg_env', [InstInfo (GhcPass 'Renamed)]
inst_info' forall a. [a] -> [a] -> [a]
++ [InstInfo (GhcPass 'Renamed)]
inst_info, HsValBindsLR (GhcPass 'Renamed) (GhcPass 'Renamed)
val_binds)
      }}}

{- *********************************************************************
*                                                                      *
        Checking for 'main'
*                                                                      *
************************************************************************
-}

checkMainType :: TcGblEnv -> TcRn WantedConstraints
-- If this is the Main module, and it defines a function main,
--   check that its type is of form IO tau.
-- If not, do nothing
-- See Note [Dealing with main]
checkMainType :: TcGblEnv -> TcRn WantedConstraints
checkMainType TcGblEnv
tcg_env
  = do { HscEnv
hsc_env <- forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
       ; if TcGblEnv -> Module
tcg_mod TcGblEnv
tcg_env forall a. Eq a => a -> a -> Bool
/= HscEnv -> Module
mainModIs HscEnv
hsc_env
         then forall (m :: * -> *) a. Monad m => a -> m a
return WantedConstraints
emptyWC else

    do { GlobalRdrEnv
rdr_env <- TcRn GlobalRdrEnv
getGlobalRdrEnv
       ; let dflags :: DynFlags
dflags    = HscEnv -> DynFlags
hsc_dflags HscEnv
hsc_env
             main_occ :: OccName
main_occ  = DynFlags -> OccName
getMainOcc DynFlags
dflags
             main_gres :: [GlobalRdrElt]
main_gres = GlobalRdrEnv -> OccName -> [GlobalRdrElt]
lookupGlobalRdrEnv GlobalRdrEnv
rdr_env OccName
main_occ
       ; case forall a. (a -> Bool) -> [a] -> [a]
filter GlobalRdrElt -> Bool
isLocalGRE [GlobalRdrElt]
main_gres of {
            []         -> forall (m :: * -> *) a. Monad m => a -> m a
return WantedConstraints
emptyWC ;
            (GlobalRdrElt
_:GlobalRdrElt
_:[GlobalRdrElt]
_)    -> forall (m :: * -> *) a. Monad m => a -> m a
return WantedConstraints
emptyWC ;
            [GlobalRdrElt
main_gre] ->

    do { let main_name :: Name
main_name = GlobalRdrElt -> Name
greMangledName GlobalRdrElt
main_gre
             ctxt :: UserTypeCtxt
ctxt      = Name -> Bool -> UserTypeCtxt
FunSigCtxt Name
main_name Bool
False
       ; Var
main_id   <- Name -> TcM Var
tcLookupId Name
main_name
       ; (Type
io_ty,Type
_) <- TcM (Type, Type)
getIOType
       ; let main_ty :: Type
main_ty   = Var -> Type
idType Var
main_id
             eq_orig :: CtOrigin
eq_orig   = TypeEqOrigin { uo_actual :: Type
uo_actual   = Type
main_ty
                                      , uo_expected :: Type
uo_expected = Type
io_ty
                                      , uo_thing :: Maybe SDoc
uo_thing    = forall a. Maybe a
Nothing
                                      , uo_visible :: Bool
uo_visible  = Bool
True }
       ; ((TcEvBinds, HsWrapper)
_, WantedConstraints
lie)  <- forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints       forall a b. (a -> b) -> a -> b
$
                      forall a. Name -> Type -> TcM a -> TcM (TcEvBinds, a)
setMainCtxt Name
main_name Type
io_ty forall a b. (a -> b) -> a -> b
$
                      CtOrigin -> UserTypeCtxt -> Type -> Type -> TcM HsWrapper
tcSubTypeSigma CtOrigin
eq_orig UserTypeCtxt
ctxt Type
main_ty Type
io_ty
       ; forall (m :: * -> *) a. Monad m => a -> m a
return WantedConstraints
lie } } } }

checkMain :: Bool  -- False => no 'module M(..) where' header at all
          -> Maybe (LocatedL [LIE GhcPs])  -- Export specs of Main module
          -> TcM TcGblEnv
-- If we are in module Main, check that 'main' is exported,
-- and generate the runMainIO binding that calls it
-- See Note [Dealing with main]
checkMain :: Bool -> Maybe (LocatedL [LIE GhcPs]) -> TcM TcGblEnv
checkMain Bool
explicit_mod_hdr Maybe (LocatedL [LIE GhcPs])
export_ies
 = do { HscEnv
hsc_env  <- forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
      ; TcGblEnv
tcg_env <- forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv

      ; let dflags :: DynFlags
dflags      = HscEnv -> DynFlags
hsc_dflags HscEnv
hsc_env
            main_mod :: Module
main_mod    = HscEnv -> Module
mainModIs HscEnv
hsc_env
            main_occ :: OccName
main_occ    = DynFlags -> OccName
getMainOcc DynFlags
dflags

            exported_mains :: [Name]
            -- Exported things that are called 'main'
            exported_mains :: [Name]
exported_mains  = [ Name
name | AvailInfo
avail <- TcGblEnv -> [AvailInfo]
tcg_exports TcGblEnv
tcg_env
                                     , Name
name  <- AvailInfo -> [Name]
availNames AvailInfo
avail
                                     , Name -> OccName
nameOccName Name
name forall a. Eq a => a -> a -> Bool
== OccName
main_occ ]

      ; if | TcGblEnv -> Module
tcg_mod TcGblEnv
tcg_env forall a. Eq a => a -> a -> Bool
/= Module
main_mod
           -> -- Not the main module
              forall (m :: * -> *) a. Monad m => a -> m a
return TcGblEnv
tcg_env

           | [Name
main_name] <- [Name]
exported_mains
           -> -- The module indeed exports a function called 'main'
              TcGblEnv -> Name -> TcM TcGblEnv
generateMainBinding TcGblEnv
tcg_env Name
main_name

           | Bool
otherwise
           -> ASSERT( null exported_mains )
              -- A fully-checked export list can't contain more
              -- than one function with the same OccName
              do { DynFlags -> Module -> OccName -> TcRnIf TcGblEnv TcLclEnv ()
complain_no_main DynFlags
dflags Module
main_mod OccName
main_occ
                 ; forall (m :: * -> *) a. Monad m => a -> m a
return TcGblEnv
tcg_env } }
  where
    complain_no_main :: DynFlags -> Module -> OccName -> TcRnIf TcGblEnv TcLclEnv ()
complain_no_main DynFlags
dflags Module
main_mod OccName
main_occ
      = forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless (Bool
interactive Bool -> Bool -> Bool
&& Bool -> Bool
not Bool
explicit_mod_hdr) forall a b. (a -> b) -> a -> b
$
        SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErrTc (Module -> OccName -> SDoc
noMainMsg Module
main_mod OccName
main_occ)          -- #12906
      where
        interactive :: Bool
interactive = DynFlags -> GhcLink
ghcLink DynFlags
dflags forall a. Eq a => a -> a -> Bool
== GhcLink
LinkInMemory
        -- Without an explicit module header...
        -- in interactive mode, don't worry about the absence of 'main'.
        -- in other modes, add error message and go on with typechecking.

    noMainMsg :: Module -> OccName -> SDoc
noMainMsg Module
main_mod OccName
main_occ
      = String -> SDoc
text String
"The" SDoc -> SDoc -> SDoc
<+> OccName -> SDoc
ppMainFn OccName
main_occ
        SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"is not" SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
defOrExp SDoc -> SDoc -> SDoc
<+> String -> SDoc
text String
"module"
        SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr Module
main_mod)

    defOrExp :: String
defOrExp | Bool
explicit_export_list = String
"exported by"
             | Bool
otherwise            = String
"defined in"
    explicit_export_list :: Bool
explicit_export_list = Bool
explicit_mod_hdr Bool -> Bool -> Bool
&& forall a. Maybe a -> Bool
isJust Maybe (LocatedL [LIE GhcPs])
export_ies

-- | Get the unqualified name of the function to use as the \"main\" for the main module.
-- Either returns the default name or the one configured on the command line with -main-is
getMainOcc :: DynFlags -> OccName
getMainOcc :: DynFlags -> OccName
getMainOcc DynFlags
dflags = case DynFlags -> Maybe String
mainFunIs DynFlags
dflags of
                      Just String
fn -> FastString -> OccName
mkVarOccFS (String -> FastString
mkFastString String
fn)
                      Maybe String
Nothing -> OccName
mainOcc

ppMainFn :: OccName -> SDoc
ppMainFn :: OccName -> SDoc
ppMainFn OccName
main_occ
  | OccName
main_occ forall a. Eq a => a -> a -> Bool
== OccName
mainOcc
  = String -> SDoc
text String
"IO action" SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr OccName
main_occ)
  | Bool
otherwise
  = String -> SDoc
text String
"main IO action" SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr OccName
main_occ)

mainOcc :: OccName
mainOcc :: OccName
mainOcc = FastString -> OccName
mkVarOccFS (String -> FastString
fsLit String
"main")

generateMainBinding :: TcGblEnv -> Name -> TcM TcGblEnv
-- There is a single exported 'main' function, called 'foo' (say),
-- which may be locally defined or imported
-- Define and typecheck the binding
--     :Main.main :: IO res_ty = runMainIO res_ty foo
-- This wraps the user's main function in the top-level stuff
-- defined in runMainIO (eg catching otherwise un-caught exceptions)
-- See Note [Dealing with main]
generateMainBinding :: TcGblEnv -> Name -> TcM TcGblEnv
generateMainBinding TcGblEnv
tcg_env Name
main_name = do
    { String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"checkMain found" (forall a. Outputable a => a -> SDoc
ppr Name
main_name)
    ; (Type
io_ty, Type
res_ty) <- TcM (Type, Type)
getIOType
    ; let loc :: SrcSpan
loc = forall a. NamedThing a => a -> SrcSpan
getSrcSpan Name
main_name
          main_expr_rn :: GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
main_expr_rn = forall l e. l -> e -> GenLocated l e
L (forall ann. SrcSpan -> SrcAnn ann
noAnnSrcSpan SrcSpan
loc) (forall p. XVar p -> LIdP p -> HsExpr p
HsVar NoExtField
noExtField (forall l e. l -> e -> GenLocated l e
L (forall ann. SrcSpan -> SrcAnn ann
noAnnSrcSpan SrcSpan
loc) Name
main_name))
    ; (TcEvBinds
ev_binds, GenLocated SrcSpanAnnA (HsExpr GhcTc)
main_expr) <- forall a. Name -> Type -> TcM a -> TcM (TcEvBinds, a)
setMainCtxt Name
main_name Type
io_ty forall a b. (a -> b) -> a -> b
$
                               LHsExpr (GhcPass 'Renamed) -> Type -> TcM (LHsExpr GhcTc)
tcCheckMonoExpr GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
main_expr_rn Type
io_ty

            -- See Note [Root-main Id]
            -- Construct the binding
            --      :Main.main :: IO res_ty = runMainIO res_ty main
    ; Var
run_main_id <- Name -> TcM Var
tcLookupId Name
runMainIOName
    ; let { root_main_name :: Name
root_main_name =  Unique -> Module -> OccName -> SrcSpan -> Name
mkExternalName Unique
rootMainKey Module
rOOT_MAIN
                               (FastString -> OccName
mkVarOccFS (String -> FastString
fsLit String
"main"))
                               (forall a. NamedThing a => a -> SrcSpan
getSrcSpan Name
main_name)
          ; root_main_id :: Var
root_main_id = Name -> Type -> Var
Id.mkExportedVanillaId Name
root_main_name Type
io_ty
          ; co :: HsWrapper
co  = [Type] -> HsWrapper
mkWpTyApps [Type
res_ty]
          -- The ev_binds of the `main` function may contain deferred
          -- type errors when type of `main` is not `IO a`. The `ev_binds`
          -- must be put inside `runMainIO` to ensure the deferred type
          -- error can be emitted correctly. See #13838.
          ; rhs :: LHsExpr GhcTc
rhs = forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsApp (HsWrapper -> LHsExpr GhcTc -> LHsExpr GhcTc
mkLHsWrap HsWrapper
co (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Var
run_main_id)) forall a b. (a -> b) -> a -> b
$
                    TcEvBinds -> LHsExpr GhcTc -> LHsExpr GhcTc
mkHsDictLet TcEvBinds
ev_binds GenLocated SrcSpanAnnA (HsExpr GhcTc)
main_expr
          ; main_bind :: LHsBind GhcTc
main_bind = forall (p :: Pass).
IdP (GhcPass p) -> LHsExpr (GhcPass p) -> LHsBind (GhcPass p)
mkVarBind Var
root_main_id LHsExpr GhcTc
rhs }

    ; forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env { tcg_main :: Maybe Name
tcg_main  = forall a. a -> Maybe a
Just Name
main_name
                      , tcg_binds :: LHsBinds GhcTc
tcg_binds = TcGblEnv -> LHsBinds GhcTc
tcg_binds TcGblEnv
tcg_env
                                    forall a. Bag a -> a -> Bag a
`snocBag` LHsBind GhcTc
main_bind
                      , tcg_dus :: DefUses
tcg_dus   = TcGblEnv -> DefUses
tcg_dus TcGblEnv
tcg_env
                                    DefUses -> DefUses -> DefUses
`plusDU` FreeVars -> DefUses
usesOnly (Name -> FreeVars
unitFV Name
main_name) })
                    -- Record the use of 'main', so that we don't
                    -- complain about it being defined but not used
    }

getIOType :: TcM (TcType, TcType)
-- Return (IO alpha, alpha) for fresh alpha
getIOType :: TcM (Type, Type)
getIOType = do { TyCon
ioTyCon <- Name -> TcM TyCon
tcLookupTyCon Name
ioTyConName
               ; Type
res_ty <- Type -> TcM Type
newFlexiTyVarTy Type
liftedTypeKind
               ; forall (m :: * -> *) a. Monad m => a -> m a
return (TyCon -> [Type] -> Type
mkTyConApp TyCon
ioTyCon [Type
res_ty], Type
res_ty) }

setMainCtxt :: Name -> TcType -> TcM a -> TcM (TcEvBinds, a)
setMainCtxt :: forall a. Name -> Type -> TcM a -> TcM (TcEvBinds, a)
setMainCtxt Name
main_name Type
io_ty TcM a
thing_inside
  = forall a. SrcSpan -> TcRn a -> TcRn a
setSrcSpan (forall a. NamedThing a => a -> SrcSpan
getSrcSpan Name
main_name) forall a b. (a -> b) -> a -> b
$
    forall a. SDoc -> TcM a -> TcM a
addErrCtxt SDoc
main_ctxt              forall a b. (a -> b) -> a -> b
$
    forall result.
SkolemInfo
-> [Var] -> [Var] -> TcM result -> TcM (TcEvBinds, result)
checkConstraints SkolemInfo
skol_info [] []  forall a b. (a -> b) -> a -> b
$  -- Builds an implication if necessary
    TcM a
thing_inside                         -- e.g. with -fdefer-type-errors
  where
    skol_info :: SkolemInfo
skol_info = UserTypeCtxt -> Type -> [(Name, Var)] -> SkolemInfo
SigSkol (Name -> Bool -> UserTypeCtxt
FunSigCtxt Name
main_name Bool
False) Type
io_ty []
    main_ctxt :: SDoc
main_ctxt = String -> SDoc
text String
"When checking the type of the"
                SDoc -> SDoc -> SDoc
<+> OccName -> SDoc
ppMainFn (Name -> OccName
nameOccName Name
main_name)

{- Note [Dealing with main]
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dealing with the 'main' declaration is surprisingly tricky. Here are
the moving parts:

* The flag -main-is=M.foo allows you to set the main module to 'M',
  and the main function to 'foo'.  We access them through
      mainModIs  :: HscEnv -> Module     -- returns M
      getMainOcc :: DynFlags -> OccName  -- returns foo
  Of course usually M = Main, and foo = main.

* checkMainType: when typechecking module M, we add an extra check that
    foo :: IO tau, for some type tau.
  This avoids getting ambiguous-type errors from the monomorphism restriction
  applying to things like
      main = return ()
  Note that checkMainType does not consult the export list because
  we have not yet done rnExports (and can't do it until later).

* rnExports: checks the export list.  Very annoyingly, we can only do
  this after running any finalisers, which may add new declarations.
  That's why checkMainType and checkMain have to be separate.

* checkMain: does two things:
  - check that the export list does indeed export something called 'foo'
  - generateMainBinding: generate the root-main binding
       :Main.main = runMainIO M.foo
  See Note [Root-main id]

An annoying consequence of having both checkMainType and checkMain is
that, when (but only when) -fdefer-type-errors is on, we may report an
ill-typed 'main' twice (as warnings): once in checkMainType and once
in checkMain. See test typecheck/should_fail/T13292.

We have the following tests to check this processing:
----------------+----------------------------------------------------------------------------------+
                |                                  Module Header:                                  |
                +-------------+-------------+-------------+-------------+-------------+------------+
                | module      | module Main | <No Header> | module Main |module       |module Main |
                |  Main(main) |             |             |   (module X)|   Main ()   |  (Sub.main)|
----------------+==================================================================================+
`main` function | ERROR:      | Main.main   | ERROR:      | Main.main   | ERROR:      | Sub.main   |
in Main module  |  Ambiguous  |             |  Ambiguous  |             |  `main` not |            |
and in imported |             |             |             |             |  exported   |            |
module Sub.     | T19397E1    | T16453M0    | T19397E2    | T16453M3    |             | T16453M1   |
                |             |             |             | X = Main    | Remark 2)   |            |
----------------+-------------+-------------+-------------+-------------+-------------+------------+
`main`function  | Sub.main    | ERROR:      | Sub.main    | Sub.main    | ERROR:      | Sub.main   |
only in imported|             | No `main` in|             |             |  `main` not |            |
submodule Sub.  |             |   `Main`    |             |             |  exported   |            |
                | T19397M0    | T16453E1    | T19397M1    | T16453M4    |             | T16453M5   |
                |             |             |             | X = Sub     | Remark 2)   |            |
----------------+-------------+-------------+-------------+-------------+-------------+------------+
`foo` function  | Sub.foo     | ERROR:      | Sub.foo     | Sub.foo     | ERROR:      | Sub.foo    |
in submodule    |             | No `foo` in |             |             |  `foo` not  |            |
Sub.            |             |   `Main`    |             |             |  exported   |            |
GHC option:     |             |             |             |             |             |            |
  -main-is foo  | T19397M2    | T19397E3    | T19397M3    | T19397M4    | T19397E4    | T16453M6   |
                | Remark 1)   |             |             | X = Sub     |             | Remark 3)  |
----------------+-------------+-------------+-------------+-------------+-------------+------------+

Remarks:
* The first line shows the exported `main` function or the error.
* The second line shows the coresponding test case.
* The module `Sub` contains the following functions:
     main :: IO ()
     foo :: IO ()
* Remark 1) Here the header is `Main (foo)`.
* Remark 2) Here we have no extra test case. It would exercise the same code path as `T19397E4`.
* Remark 3) Here the header is `Main (Sub.foo)`.


Note [Root-main Id]
~~~~~~~~~~~~~~~~~~~
The function that the RTS invokes is always :Main.main, which we call
root_main_id.  (Because GHC allows the user to have a module not
called Main as the main module, we can't rely on the main function
being called "Main.main".  That's why root_main_id has a fixed module
":Main".)

This is unusual: it's a LocalId whose Name has a Module from another
module. Tiresomely, we must filter it out again in GHC.Iface.Make, less we
get two defns for 'main' in the interface file!


*********************************************************
*                                                       *
                GHCi stuff
*                                                       *
*********************************************************
-}

runTcInteractive :: HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
-- Initialise the tcg_inst_env with instances from all home modules.
-- This mimics the more selective call to hptInstances in tcRnImports
runTcInteractive :: forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env TcRn a
thing_inside
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
initTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$ forall a. HscEnv -> TcM a -> TcM a
withTcPlugins HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$ forall a. HscEnv -> TcM a -> TcM a
withHoleFitPlugins HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    do { String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"setInteractiveContext" forall a b. (a -> b) -> a -> b
$
            [SDoc] -> SDoc
vcat [ String -> SDoc
text String
"ic_tythings:" SDoc -> SDoc -> SDoc
<+> [SDoc] -> SDoc
vcat (forall a b. (a -> b) -> [a] -> [b]
map forall a. Outputable a => a -> SDoc
ppr (InteractiveContext -> [TyThing]
ic_tythings InteractiveContext
icxt))
                 , String -> SDoc
text String
"ic_insts:" SDoc -> SDoc -> SDoc
<+> [SDoc] -> SDoc
vcat (forall a b. (a -> b) -> [a] -> [b]
map (forall a. OutputableBndr a => BindingSite -> a -> SDoc
pprBndr BindingSite
LetBind forall b c a. (b -> c) -> (a -> b) -> a -> c
. ClsInst -> Var
instanceDFunId) [ClsInst]
ic_insts)
                 , String -> SDoc
text String
"ic_rn_gbl_env (LocalDef)" SDoc -> SDoc -> SDoc
<+>
                      [SDoc] -> SDoc
vcat (forall a b. (a -> b) -> [a] -> [b]
map forall a. Outputable a => a -> SDoc
ppr [ [GlobalRdrElt]
local_gres | [GlobalRdrElt]
gres <- forall a. OccEnv a -> [a]
occEnvElts (InteractiveContext -> GlobalRdrEnv
ic_rn_gbl_env InteractiveContext
icxt)
                                                 , let local_gres :: [GlobalRdrElt]
local_gres = forall a. (a -> Bool) -> [a] -> [a]
filter GlobalRdrElt -> Bool
isLocalGRE [GlobalRdrElt]
gres
                                                 , Bool -> Bool
not (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GlobalRdrElt]
local_gres) ]) ]

       ; let getOrphans :: ModuleName
-> Maybe FastString -> IOEnv (Env TcGblEnv TcLclEnv) [Module]
getOrphans ModuleName
m Maybe FastString
mb_pkg = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (\ModIface_ 'ModIfaceFinal
iface -> forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_module ModIface_ 'ModIfaceFinal
iface
                                          forall a. a -> [a] -> [a]
: Dependencies -> [Module]
dep_orphs (forall (phase :: ModIfacePhase). ModIface_ phase -> Dependencies
mi_deps ModIface_ 'ModIfaceFinal
iface))
                                 (SDoc
-> ModuleName
-> IsBootInterface
-> Maybe FastString
-> RnM (ModIface_ 'ModIfaceFinal)
loadSrcInterface (String -> SDoc
text String
"runTcInteractive") ModuleName
m
                                                   IsBootInterface
NotBoot Maybe FastString
mb_pkg)

       ; ![Module]
orphs <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (forall a. NFData a => a -> a
force forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat) 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 (InteractiveContext -> [InteractiveImport]
ic_imports InteractiveContext
icxt) forall a b. (a -> b) -> a -> b
$ \InteractiveImport
i ->
            case InteractiveImport
i of                   -- force above: see #15111
                IIModule ModuleName
n -> ModuleName
-> Maybe FastString -> IOEnv (Env TcGblEnv TcLclEnv) [Module]
getOrphans ModuleName
n forall a. Maybe a
Nothing
                IIDecl ImportDecl GhcPs
i ->
                  let mb_pkg :: Maybe FastString
mb_pkg = StringLiteral -> FastString
sl_fs forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall pass. ImportDecl pass -> Maybe StringLiteral
ideclPkgQual ImportDecl GhcPs
i in
                  ModuleName
-> Maybe FastString -> IOEnv (Env TcGblEnv TcLclEnv) [Module]
getOrphans (forall l e. GenLocated l e -> e
unLoc (forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName ImportDecl GhcPs
i)) Maybe FastString
mb_pkg

       ; let imports :: ImportAvails
imports = ImportAvails
emptyImportAvails {
                            imp_orphs :: [Module]
imp_orphs = [Module]
orphs
                        }

       ; (TcGblEnv
gbl_env, TcLclEnv
lcl_env) <- forall gbl lcl. TcRnIf gbl lcl (gbl, lcl)
getEnvs
       ; let gbl_env' :: TcGblEnv
gbl_env' = TcGblEnv
gbl_env {
                           tcg_rdr_env :: GlobalRdrEnv
tcg_rdr_env      = InteractiveContext -> GlobalRdrEnv
ic_rn_gbl_env InteractiveContext
icxt
                         , tcg_type_env :: TypeEnv
tcg_type_env     = TypeEnv
type_env
                         , tcg_inst_env :: InstEnv
tcg_inst_env     = InstEnv -> [ClsInst] -> InstEnv
extendInstEnvList
                                               (InstEnv -> [ClsInst] -> InstEnv
extendInstEnvList (TcGblEnv -> InstEnv
tcg_inst_env TcGblEnv
gbl_env) [ClsInst]
ic_insts)
                                               [ClsInst]
home_insts
                         , tcg_fam_inst_env :: FamInstEnv
tcg_fam_inst_env = FamInstEnv -> [FamInst] -> FamInstEnv
extendFamInstEnvList
                                               (FamInstEnv -> [FamInst] -> FamInstEnv
extendFamInstEnvList (TcGblEnv -> FamInstEnv
tcg_fam_inst_env TcGblEnv
gbl_env)
                                                                     [FamInst]
ic_finsts)
                                               [FamInst]
home_fam_insts
                         , tcg_field_env :: RecFieldEnv
tcg_field_env    = forall a. [(Name, a)] -> NameEnv a
mkNameEnv [(Name, [FieldLabel])]
con_fields
                              -- setting tcg_field_env is necessary
                              -- to make RecordWildCards work (test: ghci049)
                         , tcg_fix_env :: FixityEnv
tcg_fix_env      = InteractiveContext -> FixityEnv
ic_fix_env InteractiveContext
icxt
                         , tcg_default :: Maybe [Type]
tcg_default      = InteractiveContext -> Maybe [Type]
ic_default InteractiveContext
icxt
                              -- must calculate imp_orphs of the ImportAvails
                              -- so that instance visibility is done correctly
                         , tcg_imports :: ImportAvails
tcg_imports      = ImportAvails
imports
                         }

             lcl_env' :: TcLclEnv
lcl_env' = TcLclEnv -> [(Name, TcTyThing)] -> TcLclEnv
tcExtendLocalTypeEnv TcLclEnv
lcl_env [(Name, TcTyThing)]
lcl_ids

       ; forall gbl' lcl' a gbl lcl.
(gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (TcGblEnv
gbl_env', TcLclEnv
lcl_env') TcRn a
thing_inside }
  where
    ([ClsInst]
home_insts, [FamInst]
home_fam_insts) = HscEnv -> (ModuleName -> Bool) -> ([ClsInst], [FamInst])
hptInstances HscEnv
hsc_env (\ModuleName
_ -> Bool
True)

    icxt :: InteractiveContext
icxt                     = HscEnv -> InteractiveContext
hsc_IC HscEnv
hsc_env
    ([ClsInst]
ic_insts, [FamInst]
ic_finsts)    = InteractiveContext -> ([ClsInst], [FamInst])
ic_instances InteractiveContext
icxt
    ([(Name, TcTyThing)]
lcl_ids, [TyThing]
top_ty_things) = forall a b c. (a -> Either b c) -> [a] -> ([b], [c])
partitionWith TyThing -> Either (Name, TcTyThing) TyThing
is_closed (InteractiveContext -> [TyThing]
ic_tythings InteractiveContext
icxt)

    is_closed :: TyThing -> Either (Name, TcTyThing) TyThing
    -- Put Ids with free type variables (always RuntimeUnks)
    -- in the *local* type environment
    -- See Note [Initialising the type environment for GHCi]
    is_closed :: TyThing -> Either (Name, TcTyThing) TyThing
is_closed TyThing
thing
      | AnId Var
id <- TyThing
thing
      , Bool -> Bool
not (Var -> Bool
isTypeClosedLetBndr Var
id)
      = forall a b. a -> Either a b
Left (Var -> Name
idName Var
id, ATcId { tct_id :: Var
tct_id = Var
id
                               , tct_info :: IdBindingInfo
tct_info = IdBindingInfo
NotLetBound })
      | Bool
otherwise
      = forall a b. b -> Either a b
Right TyThing
thing

    type_env1 :: TypeEnv
type_env1 = [TyThing] -> TypeEnv
mkTypeEnvWithImplicits [TyThing]
top_ty_things
    type_env :: TypeEnv
type_env  = TypeEnv -> [Var] -> TypeEnv
extendTypeEnvWithIds TypeEnv
type_env1 (forall a b. (a -> b) -> [a] -> [b]
map ClsInst -> Var
instanceDFunId [ClsInst]
ic_insts)
                -- Putting the dfuns in the type_env
                -- is just to keep Core Lint happy

    con_fields :: [(Name, [FieldLabel])]
con_fields = [ (DataCon -> Name
dataConName DataCon
c, DataCon -> [FieldLabel]
dataConFieldLabels DataCon
c)
                 | ATyCon TyCon
t <- [TyThing]
top_ty_things
                 , DataCon
c <- TyCon -> [DataCon]
tyConDataCons TyCon
t ]


{- Note [Initialising the type environment for GHCi]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Most of the Ids in ic_things, defined by the user in 'let' stmts,
have closed types. E.g.
   ghci> let foo x y = x && not y

However the GHCi debugger creates top-level bindings for Ids whose
types have free RuntimeUnk skolem variables, standing for unknown
types.  If we don't register these free TyVars as global TyVars then
the typechecker will try to quantify over them and fall over in
skolemiseQuantifiedTyVar. so we must add any free TyVars to the
typechecker's global TyVar set.  That is done by using
tcExtendLocalTypeEnv.

We do this by splitting out the Ids with open types, using 'is_closed'
to do the partition.  The top-level things go in the global TypeEnv;
the open, NotTopLevel, Ids, with free RuntimeUnk tyvars, go in the
local TypeEnv.

Note that we don't extend the local RdrEnv (tcl_rdr); all the in-scope
things are already in the interactive context's GlobalRdrEnv.
Extending the local RdrEnv isn't terrible, but it means there is an
entry for the same Name in both global and local RdrEnvs, and that
lead to duplicate "perhaps you meant..." suggestions (e.g. T5564).

We don't bother with the tcl_th_bndrs environment either.
-}

-- | The returned [Id] is the list of new Ids bound by this statement. It can
-- be used to extend the InteractiveContext via extendInteractiveContext.
--
-- The returned TypecheckedHsExpr is of type IO [ () ], a list of the bound
-- values, coerced to ().
tcRnStmt :: HscEnv -> GhciLStmt GhcPs
         -> IO (Messages DecoratedSDoc, Maybe ([Id], LHsExpr GhcTc, FixityEnv))
tcRnStmt :: HscEnv
-> GhciLStmt GhcPs
-> IO
     (Messages DecoratedSDoc, Maybe ([Var], LHsExpr GhcTc, FixityEnv))
tcRnStmt HscEnv
hsc_env GhciLStmt GhcPs
rdr_stmt
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$ do {

    -- The real work is done here
    (([Var]
bound_ids, GenLocated SrcSpanAnnA (HsExpr GhcTc)
tc_expr), FixityEnv
fix_env) <- GhciLStmt GhcPs -> TcM (PlanResult, FixityEnv)
tcUserStmt GhciLStmt GhcPs
rdr_stmt ;
    GenLocated SrcSpanAnnA (HsExpr GhcTc)
zonked_expr <- LHsExpr GhcTc -> TcM (LHsExpr GhcTc)
zonkTopLExpr GenLocated SrcSpanAnnA (HsExpr GhcTc)
tc_expr ;
    [Var]
zonked_ids  <- [Var] -> TcM [Var]
zonkTopBndrs [Var]
bound_ids ;

    TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM ;  -- we can't do the next step if there are levity polymorphism errors
                   -- test case: ghci/scripts/T13202{,a}

        -- None of the Ids should be of unboxed type, because we
        -- cast them all to HValues in the end!
    forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ Var -> TcRnIf TcGblEnv TcLclEnv ()
bad_unboxed (forall a. (a -> Bool) -> [a] -> [a]
filter (HasDebugCallStack => Type -> Bool
isUnliftedType forall b c a. (b -> c) -> (a -> b) -> a -> c
. Var -> Type
idType) [Var]
zonked_ids) ;

    String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcs 1" SDoc
empty ;
    Module
this_mod <- forall (m :: * -> *). HasModule m => m Module
getModule ;
    [Var]
global_ids <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (Module -> Var -> TcM Var
externaliseAndTidyId Module
this_mod) [Var]
zonked_ids ;
        -- Note [Interactively-bound Ids in GHCi] in GHC.Driver.Env

{- ---------------------------------------------
   At one stage I removed any shadowed bindings from the type_env;
   they are inaccessible but might, I suppose, cause a space leak if we leave them there.
   However, with Template Haskell they aren't necessarily inaccessible.  Consider this
   GHCi session
         Prelude> let f n = n * 2 :: Int
         Prelude> fName <- runQ [| f |]
         Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
         14
         Prelude> let f n = n * 3 :: Int
         Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
   In the last line we use 'fName', which resolves to the *first* 'f'
   in scope. If we delete it from the type env, GHCi crashes because
   it doesn't expect that.

   Hence this code is commented out

-------------------------------------------------- -}

    DumpFlag -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceOptTcRn DumpFlag
Opt_D_dump_tc
        ([SDoc] -> SDoc
vcat [String -> SDoc
text String
"Bound Ids" SDoc -> SDoc -> SDoc
<+> forall a. (a -> SDoc) -> [a] -> SDoc
pprWithCommas forall a. Outputable a => a -> SDoc
ppr [Var]
global_ids,
               String -> SDoc
text String
"Typechecked expr" SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr GenLocated SrcSpanAnnA (HsExpr GhcTc)
zonked_expr]) ;

    forall (m :: * -> *) a. Monad m => a -> m a
return ([Var]
global_ids, GenLocated SrcSpanAnnA (HsExpr GhcTc)
zonked_expr, FixityEnv
fix_env)
    }
  where
    bad_unboxed :: Var -> TcRnIf TcGblEnv TcLclEnv ()
bad_unboxed Var
id = SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErr ([SDoc] -> SDoc
sep [String -> SDoc
text String
"GHCi can't bind a variable of unlifted type:",
                                  Arity -> SDoc -> SDoc
nest Arity
2 (forall a. OutputableBndr a => a -> SDoc
pprPrefixOcc Var
id SDoc -> SDoc -> SDoc
<+> SDoc
dcolon SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr (Var -> Type
idType Var
id))])

{-
--------------------------------------------------------------------------
                Typechecking Stmts in GHCi

Here is the grand plan, implemented in tcUserStmt

        What you type                   The IO [HValue] that hscStmt returns
        -------------                   ------------------------------------
        let pat = expr          ==>     let pat = expr in return [coerce HVal x, coerce HVal y, ...]
                                        bindings: [x,y,...]

        pat <- expr             ==>     expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
                                        bindings: [x,y,...]

        expr (of IO type)       ==>     expr >>= \ it -> return [coerce HVal it]
          [NB: result not printed]      bindings: [it]

        expr (of non-IO type,   ==>     let it = expr in print it >> return [coerce HVal it]
          result showable)              bindings: [it]

        expr (of non-IO type,
          result not showable)  ==>     error
-}

-- | A plan is an attempt to lift some code into the IO monad.
type PlanResult = ([Id], LHsExpr GhcTc)
type Plan = TcM PlanResult

-- | Try the plans in order. If one fails (by raising an exn), try the next.
-- If one succeeds, take it.
runPlans :: [Plan] -> TcM PlanResult
runPlans :: [Plan] -> Plan
runPlans []     = forall a. String -> a
panic String
"runPlans"
runPlans [Plan
p]    = Plan
p
runPlans (Plan
p:[Plan]
ps) = forall r. TcM r -> TcM r -> TcM r
tryTcDiscardingErrs ([Plan] -> Plan
runPlans [Plan]
ps) Plan
p

-- | Typecheck (and 'lift') a stmt entered by the user in GHCi into the
-- GHCi 'environment'.
--
-- By 'lift' and 'environment we mean that the code is changed to
-- execute properly in an IO monad. See Note [Interactively-bound Ids
-- in GHCi] in GHC.Driver.Env for more details. We do this lifting by trying
-- different ways ('plans') of lifting the code into the IO monad and
-- type checking each plan until one succeeds.
tcUserStmt :: GhciLStmt GhcPs -> TcM (PlanResult, FixityEnv)

-- An expression typed at the prompt is treated very specially
tcUserStmt :: GhciLStmt GhcPs -> TcM (PlanResult, FixityEnv)
tcUserStmt (L SrcSpanAnnA
loc (BodyStmt XBodyStmt GhcPs GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
_ GenLocated SrcSpanAnnA (HsExpr GhcPs)
expr SyntaxExpr GhcPs
_ SyntaxExpr GhcPs
_))
  = do  { (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr, FreeVars
fvs) <- forall r. TcM r -> TcM r
checkNoErrs (LHsExpr GhcPs -> RnM (LHsExpr (GhcPass 'Renamed), FreeVars)
rnLExpr GenLocated SrcSpanAnnA (HsExpr GhcPs)
expr)
               -- Don't try to typecheck if the renamer fails!
        ; GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
ghciStep <- TcM (LHsExpr (GhcPass 'Renamed))
getGhciStepIO
        ; Unique
uniq <- forall gbl lcl. TcRnIf gbl lcl Unique
newUnique
        ; let loc' :: SrcSpanAnnN
loc' = forall ann. SrcSpan -> SrcAnn ann
noAnnSrcSpan forall a b. (a -> b) -> a -> b
$ forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc
        ; Name
interPrintName <- TcRn Name
getInteractivePrintName
        ; let fresh_it :: Name
fresh_it  = Unique -> SrcSpan -> Name
itName Unique
uniq (forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc)
              matches :: [GenLocated
   SrcSpanAnnA
   (Match
      (GhcPass 'Renamed)
      (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))]
matches   = [forall (p :: Pass).
IsPass p =>
HsMatchContext (NoGhcTc (GhcPass p))
-> [LPat (GhcPass p)]
-> LHsExpr (GhcPass p)
-> HsLocalBinds (GhcPass p)
-> LMatch (GhcPass p) (LHsExpr (GhcPass p))
mkMatch (forall p. LIdP p -> HsMatchContext p
mkPrefixFunRhs (forall l e. l -> e -> GenLocated l e
L SrcSpanAnnN
loc' Name
fresh_it)) [] GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr
                                   forall (a :: Pass) (b :: Pass).
HsLocalBindsLR (GhcPass a) (GhcPass b)
emptyLocalBinds]
              -- [it = expr]
              the_bind :: GenLocated
  SrcSpanAnnA (HsBindLR (GhcPass 'Renamed) (GhcPass 'Renamed))
the_bind  = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ (Origin
-> GenLocated SrcSpanAnnN Name
-> [LMatch (GhcPass 'Renamed) (LHsExpr (GhcPass 'Renamed))]
-> HsBindLR (GhcPass 'Renamed) (GhcPass 'Renamed)
mkTopFunBind Origin
FromSource
                                     (forall l e. l -> e -> GenLocated l e
L SrcSpanAnnN
loc' Name
fresh_it) [GenLocated
   SrcSpanAnnA
   (Match
      (GhcPass 'Renamed)
      (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))]
matches)
                                         { fun_ext :: XFunBind (GhcPass 'Renamed) (GhcPass 'Renamed)
fun_ext = FreeVars
fvs }
              -- Care here!  In GHCi the expression might have
              -- free variables, and they in turn may have free type variables
              -- (if we are at a breakpoint, say).  We must put those free vars

              -- [let it = expr]
              let_stmt :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
let_stmt  = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XLetStmt idL idR body
-> HsLocalBindsLR idL idR -> StmtLR idL idR body
LetStmt forall a. EpAnn a
noAnn forall a b. (a -> b) -> a -> b
$ forall idL idR.
XHsValBinds idL idR
-> HsValBindsLR idL idR -> HsLocalBindsLR idL idR
HsValBinds forall a. EpAnn a
noAnn
                           forall a b. (a -> b) -> a -> b
$ forall idL idR. XXValBindsLR idL idR -> HsValBindsLR idL idR
XValBindsLR
                               (forall idL.
[(RecFlag, LHsBinds idL)]
-> [LSig (GhcPass 'Renamed)] -> NHsValBindsLR idL
NValBinds [(RecFlag
NonRecursive,forall a. a -> Bag a
unitBag GenLocated
  SrcSpanAnnA (HsBindLR (GhcPass 'Renamed) (GhcPass 'Renamed))
the_bind)] [])

              -- [it <- e]
              bind_stmt :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
bind_stmt = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XBindStmt idL idR body -> LPat idL -> body -> StmtLR idL idR body
BindStmt
                                       (XBindStmtRn
                                          { xbsrn_bindOp :: SyntaxExpr (GhcPass 'Renamed)
xbsrn_bindOp = Name -> SyntaxExprRn
mkRnSyntaxExpr Name
bindIOName
                                          , xbsrn_failOp :: FailOperator (GhcPass 'Renamed)
xbsrn_failOp = forall a. Maybe a
Nothing
                                          })
                                       (forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc (forall p. XVarPat p -> LIdP p -> Pat p
VarPat NoExtField
noExtField (forall l e. l -> e -> GenLocated l e
L SrcSpanAnnN
loc' Name
fresh_it)))
                                       (forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsApp GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
ghciStep GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr)

              -- [; print it]
              print_it :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
print_it  = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XBodyStmt idL idR body
-> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
BodyStmt NoExtField
noExtField
                                           (forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsApp (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Name
interPrintName)
                                           (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Name
fresh_it))
                                           (Name -> SyntaxExprRn
mkRnSyntaxExpr Name
thenIOName)
                                                  forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
noSyntaxExpr

              -- NewA
              no_it_a :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
no_it_a = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XBodyStmt idL idR body
-> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
BodyStmt NoExtField
noExtField (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> [LHsExpr (GhcPass p)] -> LHsExpr (GhcPass p)
nlHsApps Name
bindIOName
                                       [GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr , forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Name
interPrintName])
                                       (Name -> SyntaxExprRn
mkRnSyntaxExpr Name
thenIOName)
                                       forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
noSyntaxExpr

              no_it_b :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
no_it_b = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XBodyStmt idL idR body
-> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
BodyStmt NoExtField
noExtField (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr)
                                       (Name -> SyntaxExprRn
mkRnSyntaxExpr Name
thenIOName)
                                       forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
noSyntaxExpr

              no_it_c :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
no_it_c = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XBodyStmt idL idR body
-> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
BodyStmt NoExtField
noExtField
                                      (forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsApp (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Name
interPrintName) GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr)
                                      (Name -> SyntaxExprRn
mkRnSyntaxExpr Name
thenIOName)
                                      forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
noSyntaxExpr

              -- See Note [GHCi Plans]

              it_plans :: [IOEnv
   (Env TcGblEnv TcLclEnv)
   ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))]
it_plans = [
                    -- Plan A
                    do { stuff :: ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
stuff@([Var
it_id], GenLocated SrcSpanAnnA (HsExpr GhcTc)
_) <- [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
bind_stmt, GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
print_it]
                       ; Type
it_ty <- Type -> TcM Type
zonkTcType (Var -> Type
idType Var
it_id)
                       ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Type -> Bool
isUnitTy forall a b. (a -> b) -> a -> b
$ Type
it_ty) forall env a. IOEnv env a
failM
                       ; forall (m :: * -> *) a. Monad m => a -> m a
return ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
stuff },

                        -- Plan B; a naked bind statement
                    [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
bind_stmt],

                        -- Plan C; check that the let-binding is typeable all by itself.
                        -- If not, fail; if so, try to print it.
                        -- The two-step process avoids getting two errors: one from
                        -- the expression itself, and one from the 'print it' part
                        -- This two-step story is very clunky, alas
                    do { ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
_ <- forall r. TcM r -> TcM r
checkNoErrs ([GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
let_stmt])
                                --- checkNoErrs defeats the error recovery of let-bindings
                       ; [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
let_stmt, GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
print_it] } ]

              -- Plans where we don't bind "it"
              no_it_plans :: [IOEnv
   (Env TcGblEnv TcLclEnv)
   ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))]
no_it_plans = [
                    [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
no_it_a] ,
                    [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
no_it_b] ,
                    [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
no_it_c] ]

        ; Bool
generate_it <- forall gbl lcl. GeneralFlag -> TcRnIf gbl lcl Bool
goptM GeneralFlag
Opt_NoIt

        -- We disable `-fdefer-type-errors` in GHCi for naked expressions.
        -- See Note [Deferred type errors in GHCi]

        -- NB: The flag `-fdefer-type-errors` implies `-fdefer-type-holes`
        -- and `-fdefer-out-of-scope-variables`. However the flag
        -- `-fno-defer-type-errors` doesn't imply `-fdefer-type-holes` and
        -- `-fno-defer-out-of-scope-variables`. Thus the later two flags
        -- also need to be unset here.
        ; ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
plan <- forall gbl lcl a.
GeneralFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetGOptM GeneralFlag
Opt_DeferTypeErrors forall a b. (a -> b) -> a -> b
$
                  forall gbl lcl a.
GeneralFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetGOptM GeneralFlag
Opt_DeferTypedHoles forall a b. (a -> b) -> a -> b
$
                  forall gbl lcl a.
GeneralFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetGOptM GeneralFlag
Opt_DeferOutOfScopeVariables forall a b. (a -> b) -> a -> b
$
                    [Plan] -> Plan
runPlans forall a b. (a -> b) -> a -> b
$ if Bool
generate_it
                                 then [IOEnv
   (Env TcGblEnv TcLclEnv)
   ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))]
no_it_plans
                                 else [IOEnv
   (Env TcGblEnv TcLclEnv)
   ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))]
it_plans

        ; FixityEnv
fix_env <- TcRn FixityEnv
getFixityEnv
        ; forall (m :: * -> *) a. Monad m => a -> m a
return (([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
plan, FixityEnv
fix_env) }

{- Note [Deferred type errors in GHCi]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In GHCi, we ensure that type errors don't get deferred when type checking the
naked expressions. Deferring type errors here is unhelpful because the
expression gets evaluated right away anyway. It also would potentially emit
two redundant type-error warnings, one from each plan.

#14963 reveals another bug that when deferred type errors is enabled
in GHCi, any reference of imported/loaded variables (directly or indirectly)
in interactively issued naked expressions will cause ghc panic. See more
detailed discussion in #14963.

The interactively issued declarations, statements, as well as the modules
loaded into GHCi, are not affected. That means, for declaration, you could
have

    Prelude> :set -fdefer-type-errors
    Prelude> x :: IO (); x = putStrLn True
    <interactive>:14:26: warning: [-Wdeferred-type-errors]
        ? Couldn't match type ‘Bool’ with ‘[Char]’
          Expected type: String
            Actual type: Bool
        ? In the first argument of ‘putStrLn’, namely ‘True’
          In the expression: putStrLn True
          In an equation for ‘x’: x = putStrLn True

But for naked expressions, you will have

    Prelude> :set -fdefer-type-errors
    Prelude> putStrLn True
    <interactive>:2:10: error:
        ? Couldn't match type ‘Bool’ with ‘[Char]’
          Expected type: String
            Actual type: Bool
        ? In the first argument of ‘putStrLn’, namely ‘True’
          In the expression: putStrLn True
          In an equation for ‘it’: it = putStrLn True

    Prelude> let x = putStrLn True
    <interactive>:2:18: warning: [-Wdeferred-type-errors]
        ? Couldn't match type ‘Bool’ with ‘[Char]’
          Expected type: String
            Actual type: Bool
        ? In the first argument of ‘putStrLn’, namely ‘True’
          In the expression: putStrLn True
          In an equation for ‘x’: x = putStrLn True
-}

tcUserStmt rdr_stmt :: GhciLStmt GhcPs
rdr_stmt@(L SrcSpanAnnA
loc StmtLR GhcPs GhcPs (GenLocated SrcSpanAnnA (HsExpr GhcPs))
_)
  = do { (([GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
rn_stmt], FixityEnv
fix_env), FreeVars
fvs) <- forall r. TcM r -> TcM r
checkNoErrs forall a b. (a -> b) -> a -> b
$
           forall (body :: * -> *) thing.
AnnoBody body =>
HsStmtContext (GhcPass 'Renamed)
-> (body GhcPs -> RnM (body (GhcPass 'Renamed), FreeVars))
-> [LStmt GhcPs (LocatedA (body GhcPs))]
-> ([Name] -> RnM (thing, FreeVars))
-> RnM
     (([LStmt (GhcPass 'Renamed) (LocatedA (body (GhcPass 'Renamed)))],
       thing),
      FreeVars)
rnStmts forall p. HsStmtContext p
GhciStmtCtxt HsExpr GhcPs -> RnM (HsExpr (GhcPass 'Renamed), FreeVars)
rnExpr [GhciLStmt GhcPs
rdr_stmt] forall a b. (a -> b) -> a -> b
$ \[Name]
_ -> do
             FixityEnv
fix_env <- TcRn FixityEnv
getFixityEnv
             forall (m :: * -> *) a. Monad m => a -> m a
return (FixityEnv
fix_env, FreeVars
emptyFVs)
            -- Don't try to typecheck if the renamer fails!
       ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceRn String
"tcRnStmt" ([SDoc] -> SDoc
vcat [forall a. Outputable a => a -> SDoc
ppr GhciLStmt GhcPs
rdr_stmt, forall a. Outputable a => a -> SDoc
ppr GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
rn_stmt, forall a. Outputable a => a -> SDoc
ppr FreeVars
fvs])
       ; forall a.
(Outputable a, Data a) =>
a -> TcRnIf TcGblEnv TcLclEnv ()
rnDump GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
rn_stmt ;

       ; GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
ghciStep <- TcM (LHsExpr (GhcPass 'Renamed))
getGhciStepIO
       ; let gi_stmt :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
gi_stmt
               | (L SrcSpanAnnA
loc (BindStmt XBindStmt
  (GhcPass 'Renamed)
  (GhcPass 'Renamed)
  (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed)))
x LPat (GhcPass 'Renamed)
pat GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
expr)) <- GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
rn_stmt
                     = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XBindStmt idL idR body -> LPat idL -> body -> StmtLR idL idR body
BindStmt XBindStmt
  (GhcPass 'Renamed)
  (GhcPass 'Renamed)
  (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed)))
x LPat (GhcPass 'Renamed)
pat (forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsApp GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
ghciStep GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
expr)
               | Bool
otherwise = GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
rn_stmt

       ; Bool
opt_pr_flag <- forall gbl lcl. GeneralFlag -> TcRnIf gbl lcl Bool
goptM GeneralFlag
Opt_PrintBindResult
       ; let print_result_plan :: [IOEnv
   (Env TcGblEnv TcLclEnv)
   ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))]
print_result_plan
               | Bool
opt_pr_flag                         -- The flag says "print result"
               , [IdP (GhcPass 'Renamed)
v] <- forall (idL :: Pass) (idR :: Pass) body.
CollectPass (GhcPass idL) =>
CollectFlag (GhcPass idL)
-> LStmtLR (GhcPass idL) (GhcPass idR) body -> [IdP (GhcPass idL)]
collectLStmtBinders forall p. CollectFlag p
CollNoDictBinders GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
gi_stmt  -- One binder
               = [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
-> Name
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
mk_print_result_plan GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
gi_stmt IdP (GhcPass 'Renamed)
v]
               | Bool
otherwise = []

        -- The plans are:
        --      [stmt; print v]         if one binder and not v::()
        --      [stmt]                  otherwise
       ; ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
plan <- [Plan] -> Plan
runPlans ([IOEnv
   (Env TcGblEnv TcLclEnv)
   ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))]
print_result_plan forall a. [a] -> [a] -> [a]
++ [[GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
gi_stmt]])
       ; forall (m :: * -> *) a. Monad m => a -> m a
return (([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
plan, FixityEnv
fix_env) }
  where
    mk_print_result_plan :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
-> Name
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
mk_print_result_plan GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
stmt Name
v
      = do { stuff :: ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
stuff@([Var
v_id], GenLocated SrcSpanAnnA (HsExpr GhcTc)
_) <- [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
stmt, GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
print_v]
           ; Type
v_ty <- Type -> TcM Type
zonkTcType (Var -> Type
idType Var
v_id)
           ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Type -> Bool
isUnitTy Type
v_ty Bool -> Bool -> Bool
|| Bool -> Bool
not (Type -> Bool
isTauTy Type
v_ty)) forall env a. IOEnv env a
failM
           ; forall (m :: * -> *) a. Monad m => a -> m a
return ([Var], GenLocated SrcSpanAnnA (HsExpr GhcTc))
stuff }
      where
        print_v :: GenLocated
  SrcSpanAnnA
  (StmtLR
     (GhcPass 'Renamed)
     (GhcPass 'Renamed)
     (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))))
print_v  = forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc forall a b. (a -> b) -> a -> b
$ forall idL idR body.
XBodyStmt idL idR body
-> body -> SyntaxExpr idR -> SyntaxExpr idR -> StmtLR idL idR body
BodyStmt NoExtField
noExtField (forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsApp (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Name
printName)
                                    (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Name
v))
                                    (Name -> SyntaxExprRn
mkRnSyntaxExpr Name
thenIOName) forall (p :: Pass). IsPass p => SyntaxExpr (GhcPass p)
noSyntaxExpr

{-
Note [GHCi Plans]
~~~~~~~~~~~~~~~~~
When a user types an expression in the repl we try to print it in three different
ways. Also, depending on whether -fno-it is set, we bind a variable called `it`
which can be used to refer to the result of the expression subsequently in the repl.

The normal plans are :
  A. [it <- e; print e]     but not if it::()
  B. [it <- e]
  C. [let it = e; print it]

When -fno-it is set, the plans are:
  A. [e >>= print]
  B. [e]
  C. [let it = e in print it]

The reason for -fno-it is explained in #14336. `it` can lead to the repl
leaking memory as it is repeatedly queried.
-}

-- | Typecheck the statements given and then return the results of the
-- statement in the form 'IO [()]'.
tcGhciStmts :: [GhciLStmt GhcRn] -> TcM PlanResult
tcGhciStmts :: [GhciLStmt (GhcPass 'Renamed)] -> Plan
tcGhciStmts [GhciLStmt (GhcPass 'Renamed)]
stmts
 = do { TyCon
ioTyCon <- Name -> TcM TyCon
tcLookupTyCon Name
ioTyConName
      ; Var
ret_id  <- Name -> TcM Var
tcLookupId Name
returnIOName             -- return @ IO
      ; let ret_ty :: Type
ret_ty      = Type -> Type
mkListTy Type
unitTy
            io_ret_ty :: Type
io_ret_ty   = TyCon -> [Type] -> Type
mkTyConApp TyCon
ioTyCon [Type
ret_ty]
            tc_io_stmts :: (ExpType -> TcM [Var])
-> TcM
     ([LStmt GhcTc (GenLocated SrcSpanAnnA (HsExpr GhcTc))], [Var])
tc_io_stmts = forall (body :: * -> *) rho_type thing.
AnnoBody body =>
HsStmtContext (GhcPass 'Renamed)
-> TcStmtChecker body rho_type
-> [LStmt (GhcPass 'Renamed) (LocatedA (body (GhcPass 'Renamed)))]
-> rho_type
-> (rho_type -> TcM thing)
-> TcM ([LStmt GhcTc (LocatedA (body GhcTc))], thing)
tcStmtsAndThen forall p. HsStmtContext p
GhciStmtCtxt TcExprStmtChecker
tcDoStmt [GhciLStmt (GhcPass 'Renamed)]
stmts
                                         (Type -> ExpType
mkCheckExpType Type
io_ret_ty)
            names :: [IdP (GhcPass 'Renamed)]
names = forall (idL :: Pass) (idR :: Pass) body.
CollectPass (GhcPass idL) =>
CollectFlag (GhcPass idL)
-> [LStmtLR (GhcPass idL) (GhcPass idR) body]
-> [IdP (GhcPass idL)]
collectLStmtsBinders forall p. CollectFlag p
CollNoDictBinders [GhciLStmt (GhcPass 'Renamed)]
stmts

        -- OK, we're ready to typecheck the stmts
      ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"GHC.Tc.Module.tcGhciStmts: tc stmts" SDoc
empty
      ; (([LocatedAn
   AnnListItem
   (StmtLR GhcTc GhcTc (GenLocated SrcSpanAnnA (HsExpr GhcTc)))]
tc_stmts, [Var]
ids), WantedConstraints
lie) <- forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints forall a b. (a -> b) -> a -> b
$
                                  (ExpType -> TcM [Var])
-> TcM
     ([LStmt GhcTc (GenLocated SrcSpanAnnA (HsExpr GhcTc))], [Var])
tc_io_stmts forall a b. (a -> b) -> a -> b
$ \ ExpType
_ ->
                                  forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM Name -> TcM Var
tcLookupId [IdP (GhcPass 'Renamed)]
names
                        -- Look up the names right in the middle,
                        -- where they will all be in scope

        -- Simplify the context
      ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"GHC.Tc.Module.tcGhciStmts: simplify ctxt" SDoc
empty
      ; Bag EvBind
const_binds <- forall r. TcM r -> TcM r
checkNoErrs (WantedConstraints -> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
simplifyInteractive WantedConstraints
lie)
                -- checkNoErrs ensures that the plan fails if context redn fails


      ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"GHC.Tc.Module.tcGhciStmts: done" SDoc
empty

      -- rec_expr is the expression
      --      returnIO @ [()] [unsafeCoerce# () x, ..,  unsafeCorece# () z]
      --
      -- Despite the inconvenience of building the type applications etc,
      -- this *has* to be done in type-annotated post-typecheck form
      -- because we are going to return a list of *polymorphic* values
      -- coerced to type (). If we built a *source* stmt
      --      return [coerce x, ..., coerce z]
      -- then the type checker would instantiate x..z, and we wouldn't
      -- get their *polymorphic* values.  (And we'd get ambiguity errs
      -- if they were overloaded, since they aren't applied to anything.)

      ; AnId Var
unsafe_coerce_id <- Name -> TcM TyThing
tcLookupGlobal Name
unsafeCoercePrimName
           -- We use unsafeCoerce# here because of (U11) in
           -- Note [Implementing unsafeCoerce] in base:Unsafe.Coerce

      ; let ret_expr :: LHsExpr GhcTc
ret_expr = forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsApp (Var -> [Type] -> LHsExpr GhcTc
nlHsTyApp Var
ret_id [Type
ret_ty]) forall a b. (a -> b) -> a -> b
$
                       forall a an. a -> LocatedAn an a
noLocA forall a b. (a -> b) -> a -> b
$ forall p. XExplicitList p -> [LHsExpr p] -> HsExpr p
ExplicitList Type
unitTy forall a b. (a -> b) -> a -> b
$
                       forall a b. (a -> b) -> [a] -> [b]
map Var -> LHsExpr GhcTc
mk_item [Var]
ids

            mk_item :: Var -> LHsExpr GhcTc
mk_item Var
id = Var
unsafe_coerce_id Var -> [Type] -> LHsExpr GhcTc
`nlHsTyApp` [ HasDebugCallStack => Type -> Type
getRuntimeRep (Var -> Type
idType Var
id)
                                                      , HasDebugCallStack => Type -> Type
getRuntimeRep Type
unitTy
                                                      , Var -> Type
idType Var
id, Type
unitTy]
                                          forall (id :: Pass).
IsPass id =>
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Var
id
            stmts :: [LocatedAn
   AnnListItem
   (StmtLR GhcTc GhcTc (GenLocated SrcSpanAnnA (HsExpr GhcTc)))]
stmts = [LocatedAn
   AnnListItem
   (StmtLR GhcTc GhcTc (GenLocated SrcSpanAnnA (HsExpr GhcTc)))]
tc_stmts forall a. [a] -> [a] -> [a]
++ [forall a an. a -> LocatedAn an a
noLocA (forall (idR :: Pass) (bodyR :: * -> *) (idL :: Pass).
IsPass idR =>
LocatedA (bodyR (GhcPass idR))
-> StmtLR
     (GhcPass idL) (GhcPass idR) (LocatedA (bodyR (GhcPass idR)))
mkLastStmt LHsExpr GhcTc
ret_expr)]

      ; forall (m :: * -> *) a. Monad m => a -> m a
return ([Var]
ids, TcEvBinds -> LHsExpr GhcTc -> LHsExpr GhcTc
mkHsDictLet (Bag EvBind -> TcEvBinds
EvBinds Bag EvBind
const_binds) forall a b. (a -> b) -> a -> b
$
                     forall a an. a -> LocatedAn an a
noLocA (forall p.
XDo p
-> HsStmtContext (HsDoRn p) -> XRec p [ExprLStmt p] -> HsExpr p
HsDo Type
io_ret_ty forall p. HsStmtContext p
GhciStmtCtxt (forall a an. a -> LocatedAn an a
noLocA [LocatedAn
   AnnListItem
   (StmtLR GhcTc GhcTc (GenLocated SrcSpanAnnA (HsExpr GhcTc)))]
stmts)))
    }

-- | Generate a typed ghciStepIO expression (ghciStep :: Ty a -> IO a)
getGhciStepIO :: TcM (LHsExpr GhcRn)
getGhciStepIO :: TcM (LHsExpr (GhcPass 'Renamed))
getGhciStepIO = do
    Name
ghciTy <- TcRn Name
getGHCiMonad
    Name
a_tv <- OccName -> TcRn Name
newName (FastString -> OccName
mkTyVarOccFS (String -> FastString
fsLit String
"a"))
    let ghciM :: LHsType (GhcPass 'Renamed)
ghciM   = forall (p :: Pass).
LHsType (GhcPass p) -> LHsType (GhcPass p) -> LHsType (GhcPass p)
nlHsAppTy (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsType (GhcPass p)
nlHsTyVar Name
ghciTy) (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsType (GhcPass p)
nlHsTyVar Name
a_tv)
        ioM :: LHsType (GhcPass 'Renamed)
ioM     = forall (p :: Pass).
LHsType (GhcPass p) -> LHsType (GhcPass p) -> LHsType (GhcPass p)
nlHsAppTy (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsType (GhcPass p)
nlHsTyVar Name
ioTyConName) (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsType (GhcPass p)
nlHsTyVar Name
a_tv)

        step_ty :: LHsSigType GhcRn
        step_ty :: LHsSigType (GhcPass 'Renamed)
step_ty = forall a an. a -> LocatedAn an a
noLocA forall a b. (a -> b) -> a -> b
$ HsSig
                     { sig_bndrs :: HsOuterSigTyVarBndrs (GhcPass 'Renamed)
sig_bndrs = HsOuterImplicit{hso_ximplicit :: XHsOuterImplicit (GhcPass 'Renamed)
hso_ximplicit = [Name
a_tv]}
                     , sig_ext :: XHsSig (GhcPass 'Renamed)
sig_ext = NoExtField
noExtField
                     , sig_body :: LHsType (GhcPass 'Renamed)
sig_body = forall (p :: Pass).
LHsType (GhcPass p) -> LHsType (GhcPass p) -> LHsType (GhcPass p)
nlHsFunTy LHsType (GhcPass 'Renamed)
ghciM LHsType (GhcPass 'Renamed)
ioM }

        stepTy :: LHsSigWcType GhcRn
        stepTy :: LHsSigWcType (GhcPass 'Renamed)
stepTy = forall thing. thing -> HsWildCardBndrs (GhcPass 'Renamed) thing
mkEmptyWildCardBndrs LHsSigType (GhcPass 'Renamed)
step_ty

    forall (m :: * -> *) a. Monad m => a -> m a
return (forall a an. a -> LocatedAn an a
noLocA forall a b. (a -> b) -> a -> b
$ forall p.
XExprWithTySig p
-> LHsExpr p -> LHsSigWcType (NoGhcTc p) -> HsExpr p
ExprWithTySig NoExtField
noExtField (forall (p :: Pass) a.
IsSrcSpanAnn p a =>
IdP (GhcPass p) -> LHsExpr (GhcPass p)
nlHsVar Name
ghciStepIoMName) LHsSigWcType (GhcPass 'Renamed)
stepTy)

isGHCiMonad :: HscEnv -> String -> IO (Messages DecoratedSDoc, Maybe Name)
isGHCiMonad :: HscEnv -> String -> IO (Messages DecoratedSDoc, Maybe Name)
isGHCiMonad HscEnv
hsc_env String
ty
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$ do
        GlobalRdrEnv
rdrEnv <- TcRn GlobalRdrEnv
getGlobalRdrEnv
        let occIO :: Maybe [GlobalRdrElt]
occIO = forall a. OccEnv a -> OccName -> Maybe a
lookupOccEnv GlobalRdrEnv
rdrEnv (NameSpace -> String -> OccName
mkOccName NameSpace
tcName String
ty)
        case Maybe [GlobalRdrElt]
occIO of
            Just [GlobalRdrElt
n] -> do
                let name :: Name
name = GlobalRdrElt -> Name
greMangledName GlobalRdrElt
n
                Class
ghciClass <- Name -> TcM Class
tcLookupClass Name
ghciIoClassName
                TyCon
userTyCon <- Name -> TcM TyCon
tcLookupTyCon Name
name
                let userTy :: Type
userTy = TyCon -> [Type] -> Type
mkTyConApp TyCon
userTyCon []
                ClsInst
_ <- Class -> [Type] -> TcM ClsInst
tcLookupInstance Class
ghciClass [Type
userTy]
                forall (m :: * -> *) a. Monad m => a -> m a
return Name
name

            Just [GlobalRdrElt]
_  -> forall a. SDoc -> TcM a
failWithTc forall a b. (a -> b) -> a -> b
$ String -> SDoc
text String
"Ambiguous type!"
            Maybe [GlobalRdrElt]
Nothing -> forall a. SDoc -> TcM a
failWithTc forall a b. (a -> b) -> a -> b
$ String -> SDoc
text (String
"Can't find type:" forall a. [a] -> [a] -> [a]
++ String
ty)

-- | How should we infer a type? See Note [TcRnExprMode]
data TcRnExprMode = TM_Inst     -- ^ Instantiate inferred quantifiers only (:type)
                  | TM_Default  -- ^ Instantiate all quantifiers,
                                --   and do eager defaulting (:type +d)

-- | tcRnExpr just finds the type of an expression
--   for :type
tcRnExpr :: HscEnv
         -> TcRnExprMode
         -> LHsExpr GhcPs
         -> IO (Messages DecoratedSDoc, Maybe Type)
tcRnExpr :: HscEnv
-> TcRnExprMode
-> LHsExpr GhcPs
-> IO (Messages DecoratedSDoc, DFunInstType)
tcRnExpr HscEnv
hsc_env TcRnExprMode
mode LHsExpr GhcPs
rdr_expr
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    do {

    (GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr, FreeVars
_fvs) <- LHsExpr GhcPs -> RnM (LHsExpr (GhcPass 'Renamed), FreeVars)
rnLExpr LHsExpr GhcPs
rdr_expr ;
    TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM ;

    -- Typecheck the expression
    ((TcLevel
tclvl, Type
res_ty), WantedConstraints
lie)
          <- forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints forall a b. (a -> b) -> a -> b
$
             forall a. TcM a -> TcM (TcLevel, a)
pushTcLevelM          forall a b. (a -> b) -> a -> b
$
             Bool -> LHsExpr (GhcPass 'Renamed) -> TcM Type
tcInferSigma Bool
inst GenLocated SrcSpanAnnA (HsExpr (GhcPass 'Renamed))
rn_expr ;

    -- Generalise
    Unique
uniq <- forall gbl lcl. TcRnIf gbl lcl Unique
newUnique ;
    let { fresh_it :: Name
fresh_it = Unique -> SrcSpan -> Name
itName Unique
uniq (forall a e. GenLocated (SrcSpanAnn' a) e -> SrcSpan
getLocA LHsExpr GhcPs
rdr_expr) } ;
    (([Var]
qtvs, [Var]
dicts, TcEvBinds
_, Bool
_), WantedConstraints
residual)
         <- forall a. TcM a -> TcM (a, WantedConstraints)
captureConstraints forall a b. (a -> b) -> a -> b
$
            TcLevel
-> InferMode
-> [TcIdSigInst]
-> [(Name, Type)]
-> WantedConstraints
-> TcM ([Var], [Var], TcEvBinds, Bool)
simplifyInfer TcLevel
tclvl InferMode
infer_mode
                          []    {- No sig vars -}
                          [(Name
fresh_it, Type
res_ty)]
                          WantedConstraints
lie ;

    -- Ignore the dictionary bindings
    Bag EvBind
_ <- TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
-> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
perhaps_disable_default_warnings forall a b. (a -> b) -> a -> b
$
         WantedConstraints -> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
simplifyInteractive WantedConstraints
residual ;

    let { all_expr_ty :: Type
all_expr_ty = [Var] -> Type -> Type
mkInfForAllTys [Var]
qtvs forall a b. (a -> b) -> a -> b
$
                        [Type] -> Type -> Type
mkPhiTy (forall a b. (a -> b) -> [a] -> [b]
map Var -> Type
idType [Var]
dicts) Type
res_ty } ;
    Type
ty <- Type -> TcM Type
zonkTcType Type
all_expr_ty ;

    -- See Note [Normalising the type in :type]
    FamInstEnvs
fam_envs <- TcM FamInstEnvs
tcGetFamInstEnvs ;
    let { normalised_type :: Type
normalised_type = forall a b. (a, b) -> b
snd forall a b. (a -> b) -> a -> b
$ FamInstEnvs -> Role -> Type -> (Coercion, Type)
normaliseType FamInstEnvs
fam_envs Role
Nominal Type
ty
          -- normaliseType returns a coercion which we discard, so the Role is irrelevant.
        ; final_type :: Type
final_type = if Type -> Bool
isSigmaTy Type
res_ty then Type
ty else Type
normalised_type } ;
    forall (m :: * -> *) a. Monad m => a -> m a
return Type
final_type }
  where
    -- Optionally instantiate the type of the expression
    -- See Note [TcRnExprMode]
    (Bool
inst, InferMode
infer_mode, TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
-> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
perhaps_disable_default_warnings) = case TcRnExprMode
mode of
      TcRnExprMode
TM_Inst    -> (Bool
False, InferMode
NoRestrictions,  forall a. a -> a
id)
      TcRnExprMode
TM_Default -> (Bool
True,  InferMode
EagerDefaulting, forall gbl lcl a.
WarningFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetWOptM WarningFlag
Opt_WarnTypeDefaults)

{- Note [Implementing :type]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Consider   :type const

We want    forall a b. a -> b -> a
and not    forall {a}{b}. a -> b -> a

The latter is what we'd get if we eagerly instantiated and then
re-generalised with Inferred binders.  It makes a difference, because
it tells us we where we can use Visible Type Application (VTA).

And also for   :type const @Int
we want        forall b. Int -> b -> Int
and not        forall {b}. Int -> b -> Int

Solution: use tcInferSigma, which in turn uses tcInferApp, which
has a special case for application chains.

Note [Normalising the type in :type]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In :t <expr> we usually normalise the type (to simplify type functions)
before displaying the result.  Reason (see #10321): otherwise we may show
types like
    <expr> :: Vec (1+2) Int
rather than the simpler
    <expr> :: Vec 3 Int
In GHC.Tc.Gen.Bind.mkInferredPolyId we normalise for a very similar reason.

However this normalisation is less helpful when <expr> is just
an identifier, whose user-written type happens to contain type-function
applications.  E.g. (#20974)
    test :: F [Monad, A, B] m => m ()
where F is a type family.  If we say `:t test`, we'd prefer to see
the type family un-expanded.

We adopt the following ad-hoc solution: if the type inferred for <expr>
(before generalisation, namely res_ty) is a SigmaType (i.e. is not
fully instantiated) then do not normalise; otherwise normalise.
This is not ideal; for example, suppose  x :: F Int.  Then
  :t x
would be normalised because `F Int` is not a SigmaType.  But
anything here is ad-hoc, and it's a user-sought improvement.
-}

--------------------------
tcRnImportDecls :: HscEnv
                -> [LImportDecl GhcPs]
                -> IO (Messages DecoratedSDoc, Maybe GlobalRdrEnv)
-- Find the new chunk of GlobalRdrEnv created by this list of import
-- decls.  In contract tcRnImports *extends* the TcGblEnv.
tcRnImportDecls :: HscEnv
-> [LImportDecl GhcPs]
-> IO (Messages DecoratedSDoc, Maybe GlobalRdrEnv)
tcRnImportDecls HscEnv
hsc_env [LImportDecl GhcPs]
import_decls
 =  forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    do { TcGblEnv
gbl_env <- forall gbl lcl a.
(gbl -> gbl) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updGblEnv TcGblEnv -> TcGblEnv
zap_rdr_env forall a b. (a -> b) -> a -> b
$
                    HscEnv -> [LImportDecl GhcPs] -> TcM TcGblEnv
tcRnImports HscEnv
hsc_env [LImportDecl GhcPs]
import_decls
       ; forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv -> GlobalRdrEnv
tcg_rdr_env TcGblEnv
gbl_env) }
  where
    zap_rdr_env :: TcGblEnv -> TcGblEnv
zap_rdr_env TcGblEnv
gbl_env = TcGblEnv
gbl_env { tcg_rdr_env :: GlobalRdrEnv
tcg_rdr_env = GlobalRdrEnv
emptyGlobalRdrEnv }

-- tcRnType just finds the kind of a type
tcRnType :: HscEnv
         -> ZonkFlexi
         -> Bool        -- Normalise the returned type
         -> LHsType GhcPs
         -> IO (Messages DecoratedSDoc, Maybe (Type, Kind))
tcRnType :: HscEnv
-> ZonkFlexi
-> Bool
-> LHsType GhcPs
-> IO (Messages DecoratedSDoc, Maybe (Type, Type))
tcRnType HscEnv
hsc_env ZonkFlexi
flexi Bool
normalise LHsType GhcPs
rdr_type
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    forall gbl lcl a. Extension -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setXOptM Extension
LangExt.PolyKinds forall a b. (a -> b) -> a -> b
$   -- See Note [Kind-generalise in tcRnType]
    do { (HsWC { hswc_ext :: forall pass thing. HsWildCardBndrs pass thing -> XHsWC pass thing
hswc_ext = XHsWC
  (GhcPass 'Renamed)
  (GenLocated SrcSpanAnnA (HsType (GhcPass 'Renamed)))
wcs, hswc_body :: forall pass thing. HsWildCardBndrs pass thing -> thing
hswc_body = GenLocated SrcSpanAnnA (HsType (GhcPass 'Renamed))
rn_type }, FreeVars
_fvs)
               <- HsDocContext
-> LHsWcType GhcPs -> RnM (LHsWcType (GhcPass 'Renamed), FreeVars)
rnHsWcType HsDocContext
GHCiCtx (forall thing. thing -> HsWildCardBndrs GhcPs thing
mkHsWildCardBndrs LHsType GhcPs
rdr_type)
                  -- The type can have wild cards, but no implicit
                  -- generalisation; e.g.   :kind (T _)
       ; TcRnIf TcGblEnv TcLclEnv ()
failIfErrsM

        -- We follow Note [Recipe for checking a signature] in GHC.Tc.Gen.HsType here

        -- Now kind-check the type
        -- It can have any rank or kind
        -- First bring into scope any wildcards
       ; String -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
traceTc String
"tcRnType" ([SDoc] -> SDoc
vcat [forall a. Outputable a => a -> SDoc
ppr XHsWC
  (GhcPass 'Renamed)
  (GenLocated SrcSpanAnnA (HsType (GhcPass 'Renamed)))
wcs, forall a. Outputable a => a -> SDoc
ppr GenLocated SrcSpanAnnA (HsType (GhcPass 'Renamed))
rn_type])
       ; ((Type
ty, Type
kind), WantedConstraints
wanted)
               <- forall a. TcM a -> TcM (a, WantedConstraints)
captureTopConstraints forall a b. (a -> b) -> a -> b
$
                  forall r. TcM r -> TcM r
pushTcLevelM_         forall a b. (a -> b) -> a -> b
$
                  forall a. [Name] -> ([(Name, Var)] -> TcM a) -> TcM a
bindNamedWildCardBinders XHsWC
  (GhcPass 'Renamed)
  (GenLocated SrcSpanAnnA (HsType (GhcPass 'Renamed)))
wcs forall a b. (a -> b) -> a -> b
$ \ [(Name, Var)]
wcs' ->
                  do { forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (Name, Var) -> TcRnIf TcGblEnv TcLclEnv ()
emitNamedTypeHole [(Name, Var)]
wcs'
                     ; LHsType (GhcPass 'Renamed) -> TcM (Type, Type)
tcInferLHsTypeUnsaturated GenLocated SrcSpanAnnA (HsType (GhcPass 'Renamed))
rn_type }

       -- Since all the wanteds are equalities, the returned bindings will be empty
       ; Bag EvBind
empty_binds <- WantedConstraints -> TcRnIf TcGblEnv TcLclEnv (Bag EvBind)
simplifyTop WantedConstraints
wanted
       ; MASSERT2( isEmptyBag empty_binds, ppr empty_binds )

       -- Do kind generalisation; see Note [Kind-generalise in tcRnType]
       ; [Var]
kvs <- Type -> TcM [Var]
kindGeneralizeAll Type
kind

       ; ZonkEnv
e <- ZonkFlexi -> TcM ZonkEnv
mkEmptyZonkEnv ZonkFlexi
flexi
       ; Type
ty  <- ZonkEnv -> Type -> TcM Type
zonkTcTypeToTypeX ZonkEnv
e Type
ty

       -- Do validity checking on type
       ; UserTypeCtxt -> Type -> TcRnIf TcGblEnv TcLclEnv ()
checkValidType (Bool -> UserTypeCtxt
GhciCtxt Bool
True) Type
ty

       -- Optionally (:k vs :k!) normalise the type. Does two things:
       --   normaliseType: expand type-family applications
       --   expandTypeSynonyms: expand type synonyms (#18828)
       ; FamInstEnvs
fam_envs <- TcM FamInstEnvs
tcGetFamInstEnvs
       ; let ty' :: Type
ty' | Bool
normalise = Type -> Type
expandTypeSynonyms forall a b. (a -> b) -> a -> b
$ forall a b. (a, b) -> b
snd forall a b. (a -> b) -> a -> b
$
                               FamInstEnvs -> Role -> Type -> (Coercion, Type)
normaliseType FamInstEnvs
fam_envs Role
Nominal Type
ty
                 | Bool
otherwise = Type
ty

       ; forall (m :: * -> *) a. Monad m => a -> m a
return (Type
ty', [Var] -> Type -> Type
mkInfForAllTys [Var]
kvs (HasDebugCallStack => Type -> Type
tcTypeKind Type
ty')) }


{- Note [TcRnExprMode]
~~~~~~~~~~~~~~~~~~~~~~
How should we infer a type when a user asks for the type of an expression e
at the GHCi prompt? We offer 2 different possibilities, described below. Each
considers this example, with -fprint-explicit-foralls enabled.  See also
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0179-printing-foralls.rst

:type / TM_Inst

  In this mode, we report the type obained by instantiating only the
  /inferred/ quantifiers of e's type, solving constraints, and
  re-generalising, as discussed in #11376.

  > :type reverse
  reverse :: forall a. [a] -> [a]

  -- foo :: forall a f b. (Show a, Num b, Foldable f) => a -> f b -> String
  > :type +v foo @Int
  forall f b. (Show Int, Num b, Foldable f) => Int -> f b -> String

  Note that Show Int is still reported, because the solver never got a chance
  to see it.

:type +d / TM_Default

  This mode is for the benefit of users who wish to see instantiations
  of generalized types, and in particular to instantiate Foldable and
  Traversable.  In this mode, all type variables (inferred or
  specified) are instantiated.  Because GHCi uses
  -XExtendedDefaultRules, this means that Foldable and Traversable are
  defaulted.

  > :type +d reverse
  reverse :: forall {a}. [a] -> [a]

  -- foo :: forall a f b. (Show a, Num b, Foldable f) => a -> f b -> String
  > :type +d foo @Int
  Int -> [Integer] -> String

  Note that this mode can sometimes lead to a type error, if a type variable is
  used with a defaultable class but cannot actually be defaulted:

  bar :: (Num a, Monoid a) => a -> a
  > :type +d bar
  ** error **

  The error arises because GHC tries to default a but cannot find a concrete
  type in the defaulting list that is both Num and Monoid. (If this list is
  modified to include an element that is both Num and Monoid, the defaulting
  would succeed, of course.)

  Note that the variables and constraints are reordered here, because this
  is possible during regeneralization. Also note that the variables are
  reported as Inferred instead of Specified.

Note [Kind-generalise in tcRnType]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We switch on PolyKinds when kind-checking a user type, so that we will
kind-generalise the type, even when PolyKinds is not otherwise on.
This gives the right default behaviour at the GHCi prompt, where if
you say ":k T", and T has a polymorphic kind, you'd like to see that
polymorphism. Of course.  If T isn't kind-polymorphic you won't get
anything unexpected, but the apparent *loss* of polymorphism, for
types that you know are polymorphic, is quite surprising.  See Trac
#7688 for a discussion.

Note that the goal is to generalise the *kind of the type*, not
the type itself! Example:
  ghci> data SameKind :: k -> k -> Type
  ghci> :k SameKind _

We want to get `k -> Type`, not `Any -> Type`, which is what we would
get without kind-generalisation. Note that `:k SameKind` is OK, as
GHC will not instantiate SameKind here, and so we see its full kind
of `forall k. k -> k -> Type`.

************************************************************************
*                                                                      *
                 tcRnDeclsi
*                                                                      *
************************************************************************

tcRnDeclsi exists to allow class, data, and other declarations in GHCi.
-}

tcRnDeclsi :: HscEnv
           -> [LHsDecl GhcPs]
           -> IO (Messages DecoratedSDoc, Maybe TcGblEnv)
tcRnDeclsi :: HscEnv
-> [LHsDecl GhcPs] -> IO (Messages DecoratedSDoc, Maybe TcGblEnv)
tcRnDeclsi HscEnv
hsc_env [LHsDecl GhcPs]
local_decls
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    Bool
-> Maybe (LocatedL [LIE GhcPs]) -> [LHsDecl GhcPs] -> TcM TcGblEnv
tcRnSrcDecls Bool
False forall a. Maybe a
Nothing [LHsDecl GhcPs]
local_decls

externaliseAndTidyId :: Module -> Id -> TcM Id
externaliseAndTidyId :: Module -> Var -> TcM Var
externaliseAndTidyId Module
this_mod Var
id
  = do { Name
name' <- forall m n. Module -> Name -> TcRnIf m n Name
externaliseName Module
this_mod (Var -> Name
idName Var
id)
       ; forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ Var -> Var
globaliseId Var
id
                     Var -> Name -> Var
`setIdName` Name
name'
                     Var -> Type -> Var
`setIdType` Type -> Type
tidyTopType (Var -> Type
idType Var
id) }


{-
************************************************************************
*                                                                      *
        More GHCi stuff, to do with browsing and getting info
*                                                                      *
************************************************************************
-}

-- | ASSUMES that the module is either in the 'HomePackageTable' or is
-- a package module with an interface on disk.  If neither of these is
-- true, then the result will be an error indicating the interface
-- could not be found.
getModuleInterface :: HscEnv -> Module -> IO (Messages DecoratedSDoc, Maybe ModIface)
getModuleInterface :: HscEnv
-> Module
-> IO (Messages DecoratedSDoc, Maybe (ModIface_ 'ModIfaceFinal))
getModuleInterface HscEnv
hsc_env Module
mod
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    SDoc -> Module -> RnM (ModIface_ 'ModIfaceFinal)
loadModuleInterface (String -> SDoc
text String
"getModuleInterface") Module
mod

tcRnLookupRdrName :: HscEnv -> LocatedN RdrName
                  -> IO (Messages DecoratedSDoc, Maybe [Name])
-- ^ Find all the Names that this RdrName could mean, in GHCi
tcRnLookupRdrName :: HscEnv
-> GenLocated SrcSpanAnnN RdrName
-> IO (Messages DecoratedSDoc, Maybe [Name])
tcRnLookupRdrName HscEnv
hsc_env (L SrcSpanAnnN
loc RdrName
rdr_name)
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    forall ann a. SrcSpanAnn' ann -> TcRn a -> TcRn a
setSrcSpanA SrcSpanAnnN
loc          forall a b. (a -> b) -> a -> b
$
    do {   -- If the identifier is a constructor (begins with an
           -- upper-case letter), then we need to consider both
           -- constructor and type class identifiers.
         let rdr_names :: [RdrName]
rdr_names = RdrName -> [RdrName]
dataTcOccs RdrName
rdr_name
       ; [[Name]]
names_s <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM RdrName -> TcRn [Name]
lookupInfoOccRn [RdrName]
rdr_names
       ; let names :: [Name]
names = forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [[Name]]
names_s
       ; forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [Name]
names) (SDoc -> TcRnIf TcGblEnv TcLclEnv ()
addErrTc (String -> SDoc
text String
"Not in scope:" SDoc -> SDoc -> SDoc
<+> SDoc -> SDoc
quotes (forall a. Outputable a => a -> SDoc
ppr RdrName
rdr_name)))
       ; forall (m :: * -> *) a. Monad m => a -> m a
return [Name]
names }

tcRnLookupName :: HscEnv -> Name -> IO (Messages DecoratedSDoc, Maybe TyThing)
tcRnLookupName :: HscEnv -> Name -> IO (Messages DecoratedSDoc, Maybe TyThing)
tcRnLookupName HscEnv
hsc_env Name
name
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    Name -> TcM TyThing
tcRnLookupName' Name
name

-- To look up a name we have to look in the local environment (tcl_lcl)
-- as well as the global environment, which is what tcLookup does.
-- But we also want a TyThing, so we have to convert:

tcRnLookupName' :: Name -> TcRn TyThing
tcRnLookupName' :: Name -> TcM TyThing
tcRnLookupName' Name
name = do
   TcTyThing
tcthing <- Name -> TcM TcTyThing
tcLookup Name
name
   case TcTyThing
tcthing of
     AGlobal TyThing
thing    -> forall (m :: * -> *) a. Monad m => a -> m a
return TyThing
thing
     ATcId{tct_id :: TcTyThing -> Var
tct_id=Var
id} -> forall (m :: * -> *) a. Monad m => a -> m a
return (Var -> TyThing
AnId Var
id)
     TcTyThing
_ -> forall a. String -> a
panic String
"tcRnLookupName'"

tcRnGetInfo :: HscEnv
            -> Name
            -> IO ( Messages DecoratedSDoc
                  , Maybe (TyThing, Fixity, [ClsInst], [FamInst], SDoc))

-- Used to implement :info in GHCi
--
-- Look up a RdrName and return all the TyThings it might be
-- A capitalised RdrName is given to us in the DataName namespace,
-- but we want to treat it as *both* a data constructor
--  *and* as a type or class constructor;
-- hence the call to dataTcOccs, and we return up to two results
tcRnGetInfo :: HscEnv
-> Name
-> IO
     (Messages DecoratedSDoc,
      Maybe (TyThing, Fixity, [ClsInst], [FamInst], SDoc))
tcRnGetInfo HscEnv
hsc_env Name
name
  = forall a. HscEnv -> TcRn a -> IO (Messages DecoratedSDoc, Maybe a)
runTcInteractive HscEnv
hsc_env forall a b. (a -> b) -> a -> b
$
    do { HscEnv -> InteractiveContext -> TcRnIf TcGblEnv TcLclEnv ()
loadUnqualIfaces HscEnv
hsc_env (HscEnv -> InteractiveContext
hsc_IC HscEnv
hsc_env)
           -- Load the interface for all unqualified types and classes
           -- That way we will find all the instance declarations
           -- (Packages have not orphan modules, and we assume that
           --  in the home package all relevant modules are loaded.)

       ; TyThing
thing  <- Name -> TcM TyThing
tcRnLookupName' Name
name
       ; Fixity
fixity <- Name -> RnM Fixity
lookupFixityRn Name
name
       ; ([ClsInst]
cls_insts, [FamInst]
fam_insts) <- TyThing -> TcM ([ClsInst], [FamInst])
lookupInsts TyThing
thing
       ; let info :: SDoc
info = Name -> SDoc
lookupKnownNameInfo Name
name
       ; forall (m :: * -> *) a. Monad m => a -> m a
return (TyThing
thing, Fixity
fixity, [ClsInst]
cls_insts, [FamInst]
fam_insts, SDoc
info) }


-- Lookup all class and family instances for a type constructor.
--
-- This function filters all instances in the type environment, so there
-- is a lot of duplicated work if it is called many times in the same
-- type environment. If this becomes a problem, the NameEnv computed
-- in GHC.getNameToInstancesIndex could be cached in TcM and both functions
-- could be changed to consult that index.
lookupInsts :: TyThing -> TcM ([ClsInst],[FamInst])
lookupInsts :: TyThing -> TcM ([ClsInst], [FamInst])
lookupInsts (ATyCon TyCon
tc)
  = do  { InstEnvs { ie_global :: InstEnvs -> InstEnv
ie_global = InstEnv
pkg_ie, ie_local :: InstEnvs -> InstEnv
ie_local = InstEnv
home_ie, ie_visible :: InstEnvs -> VisibleOrphanModules
ie_visible = VisibleOrphanModules
vis_mods } <- TcM InstEnvs
tcGetInstEnvs
        ; (FamInstEnv
pkg_fie, FamInstEnv
home_fie) <- TcM FamInstEnvs
tcGetFamInstEnvs
                -- Load all instances for all classes that are
                -- in the type environment (which are all the ones
                -- we've seen in any interface file so far)

          -- Return only the instances relevant to the given thing, i.e.
          -- the instances whose head contains the thing's name.
        ; let cls_insts :: [ClsInst]
cls_insts =
                 [ ClsInst
ispec        -- Search all
                 | ClsInst
ispec <- InstEnv -> [ClsInst]
instEnvElts InstEnv
home_ie forall a. [a] -> [a] -> [a]
++ InstEnv -> [ClsInst]
instEnvElts InstEnv
pkg_ie
                 , VisibleOrphanModules -> ClsInst -> Bool
instIsVisible VisibleOrphanModules
vis_mods ClsInst
ispec
                 , Name
tc_name Name -> FreeVars -> Bool
`elemNameSet` ClsInst -> FreeVars
orphNamesOfClsInst ClsInst
ispec ]
        ; let fam_insts :: [FamInst]
fam_insts =
                 [ FamInst
fispec
                 | FamInst
fispec <- FamInstEnv -> [FamInst]
famInstEnvElts FamInstEnv
home_fie forall a. [a] -> [a] -> [a]
++ FamInstEnv -> [FamInst]
famInstEnvElts FamInstEnv
pkg_fie
                 , Name
tc_name Name -> FreeVars -> Bool
`elemNameSet` FamInst -> FreeVars
orphNamesOfFamInst FamInst
fispec ]
        ; forall (m :: * -> *) a. Monad m => a -> m a
return ([ClsInst]
cls_insts, [FamInst]
fam_insts) }
  where
    tc_name :: Name
tc_name     = TyCon -> Name
tyConName TyCon
tc

lookupInsts TyThing
_ = forall (m :: * -> *) a. Monad m => a -> m a
return ([],[])

loadUnqualIfaces :: HscEnv -> InteractiveContext -> TcM ()
-- Load the interface for everything that is in scope unqualified
-- This is so that we can accurately report the instances for
-- something
loadUnqualIfaces :: HscEnv -> InteractiveContext -> TcRnIf TcGblEnv TcLclEnv ()
loadUnqualIfaces HscEnv
hsc_env InteractiveContext
ictxt
  = forall a. IfG a -> TcRn a
initIfaceTcRn forall a b. (a -> b) -> a -> b
$
    forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (forall lcl. SDoc -> Module -> IfM lcl (ModIface_ 'ModIfaceFinal)
loadSysInterface SDoc
doc) (VisibleOrphanModules -> [Module]
moduleSetElts ([Module] -> VisibleOrphanModules
mkModuleSet [Module]
unqual_mods))
  where
    home_unit :: HomeUnit
home_unit = HscEnv -> HomeUnit
hsc_home_unit HscEnv
hsc_env

    unqual_mods :: [Module]
unqual_mods = [ HasDebugCallStack => Name -> Module
nameModule Name
name
                  | GlobalRdrElt
gre <- GlobalRdrEnv -> [GlobalRdrElt]
globalRdrEnvElts (InteractiveContext -> GlobalRdrEnv
ic_rn_gbl_env InteractiveContext
ictxt)
                  , let name :: Name
name = GlobalRdrElt -> Name
greMangledName GlobalRdrElt
gre
                  , HomeUnit -> Name -> Bool
nameIsFromExternalPackage HomeUnit
home_unit Name
name
                  , OccName -> Bool
isTcOcc (Name -> OccName
nameOccName Name
name)   -- Types and classes only
                  , GlobalRdrElt -> Bool
unQualOK GlobalRdrElt
gre ]               -- In scope unqualified
    doc :: SDoc
doc = String -> SDoc
text String
"Need interface for module whose export(s) are in scope unqualified"



{-
************************************************************************
*                                                                      *
                Debugging output
      This is what happens when you do -ddump-types
*                                                                      *
************************************************************************
-}

-- | Dump, with a banner, if -ddump-rn
rnDump :: (Outputable a, Data a) => a -> TcRn ()
rnDump :: forall a.
(Outputable a, Data a) =>
a -> TcRnIf TcGblEnv TcLclEnv ()
rnDump a
rn = DumpFlag
-> String -> DumpFormat -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
dumpOptTcRn DumpFlag
Opt_D_dump_rn String
"Renamer" DumpFormat
FormatHaskell (forall a. Outputable a => a -> SDoc
ppr a
rn)

tcDump :: TcGblEnv -> TcRn ()
tcDump :: TcGblEnv -> TcRnIf TcGblEnv TcLclEnv ()
tcDump TcGblEnv
env
 = do { DynFlags
dflags <- forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags ;
        UnitState
unit_state <- HscEnv -> UnitState
hsc_units forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv ;

        -- Dump short output if -ddump-types or -ddump-tc
        forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (DumpFlag -> DynFlags -> Bool
dopt DumpFlag
Opt_D_dump_types DynFlags
dflags Bool -> Bool -> Bool
|| DumpFlag -> DynFlags -> Bool
dopt DumpFlag
Opt_D_dump_tc DynFlags
dflags)
          (Bool
-> DumpFlag
-> String
-> DumpFormat
-> SDoc
-> TcRnIf TcGblEnv TcLclEnv ()
dumpTcRn Bool
True DumpFlag
Opt_D_dump_types
            String
"" DumpFormat
FormatText (UnitState -> SDoc -> SDoc
pprWithUnitState UnitState
unit_state SDoc
short_dump)) ;

        -- Dump bindings if -ddump-tc
        DumpFlag
-> String -> DumpFormat -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
dumpOptTcRn DumpFlag
Opt_D_dump_tc String
"Typechecker" DumpFormat
FormatHaskell SDoc
full_dump;

        -- Dump bindings as an hsSyn AST if -ddump-tc-ast
        DumpFlag
-> String -> DumpFormat -> SDoc -> TcRnIf TcGblEnv TcLclEnv ()
dumpOptTcRn DumpFlag
Opt_D_dump_tc_ast String
"Typechecker AST" DumpFormat
FormatHaskell SDoc
ast_dump
   }
  where
    short_dump :: SDoc
short_dump = TcGblEnv -> SDoc
pprTcGblEnv TcGblEnv
env
    full_dump :: SDoc
full_dump  = forall (idL :: Pass) (idR :: Pass).
(OutputableBndrId idL, OutputableBndrId idR) =>
LHsBindsLR (GhcPass idL) (GhcPass idR) -> SDoc
pprLHsBinds (TcGblEnv -> LHsBinds GhcTc
tcg_binds TcGblEnv
env)
        -- NB: foreign x-d's have undefined's in their types;
        --     hence can't show the tc_fords
    ast_dump :: SDoc
ast_dump = forall a. Data a => BlankSrcSpan -> BlankEpAnnotations -> a -> SDoc
showAstData BlankSrcSpan
NoBlankSrcSpan BlankEpAnnotations
NoBlankEpAnnotations (TcGblEnv -> LHsBinds GhcTc
tcg_binds TcGblEnv
env)

-- It's unpleasant having both pprModGuts and pprModDetails here
pprTcGblEnv :: TcGblEnv -> SDoc
pprTcGblEnv :: TcGblEnv -> SDoc
pprTcGblEnv (TcGblEnv { tcg_type_env :: TcGblEnv -> TypeEnv
tcg_type_env  = TypeEnv
type_env,
                        tcg_insts :: TcGblEnv -> [ClsInst]
tcg_insts     = [ClsInst]
insts,
                        tcg_fam_insts :: TcGblEnv -> [FamInst]
tcg_fam_insts = [FamInst]
fam_insts,
                        tcg_rules :: TcGblEnv -> [LRuleDecl GhcTc]
tcg_rules     = [LRuleDecl GhcTc]
rules,
                        tcg_imports :: TcGblEnv -> ImportAvails
tcg_imports   = ImportAvails
imports })
  = (Bool -> SDoc) -> SDoc
getPprDebug forall a b. (a -> b) -> a -> b
$ \Bool
debug ->
    [SDoc] -> SDoc
vcat [ Bool -> TypeEnv -> SDoc
ppr_types Bool
debug TypeEnv
type_env
         , Bool -> [FamInst] -> TypeEnv -> SDoc
ppr_tycons Bool
debug [FamInst]
fam_insts TypeEnv
type_env
         , Bool -> TypeEnv -> SDoc
ppr_datacons Bool
debug TypeEnv
type_env
         , TypeEnv -> SDoc
ppr_patsyns TypeEnv
type_env
         , [ClsInst] -> SDoc
ppr_insts [ClsInst]
insts
         , [FamInst] -> SDoc
ppr_fam_insts [FamInst]
fam_insts
         , [LRuleDecl GhcTc] -> SDoc
ppr_rules [LRuleDecl GhcTc]
rules
         , String -> SDoc
text String
"Dependent modules:" SDoc -> SDoc -> SDoc
<+>
                forall key a. UniqFM key a -> ([a] -> SDoc) -> SDoc
pprUFM (ImportAvails -> ModuleNameEnv ModuleNameWithIsBoot
imp_dep_mods ImportAvails
imports) (forall a. Outputable a => a -> SDoc
ppr forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Ord a => [a] -> [a]
sort)
         , String -> SDoc
text String
"Dependent packages:" SDoc -> SDoc -> SDoc
<+>
                forall a. Outputable a => a -> SDoc
ppr (forall a. Set a -> [a]
S.toList forall a b. (a -> b) -> a -> b
$ ImportAvails -> Set UnitId
imp_dep_pkgs ImportAvails
imports)]
                -- The use of sort is just to reduce unnecessary
                -- wobbling in testsuite output

ppr_rules :: [LRuleDecl GhcTc] -> SDoc
ppr_rules :: [LRuleDecl GhcTc] -> SDoc
ppr_rules [LRuleDecl GhcTc]
rules
  = Bool -> SDoc -> SDoc
ppUnless (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [LRuleDecl GhcTc]
rules) forall a b. (a -> b) -> a -> b
$
    SDoc -> Arity -> SDoc -> SDoc
hang (String -> SDoc
text String
"RULES")
       Arity
2 ([SDoc] -> SDoc
vcat (forall a b. (a -> b) -> [a] -> [b]
map forall a. Outputable a => a -> SDoc
ppr [LRuleDecl GhcTc]
rules))

ppr_types :: Bool -> TypeEnv -> SDoc
ppr_types :: Bool -> TypeEnv -> SDoc
ppr_types Bool
debug TypeEnv
type_env
  = forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
"TYPE SIGNATURES" Var -> SDoc
ppr_sig
             (forall a. (a -> a -> Ordering) -> [a] -> [a]
sortBy (forall a b. Ord a => (b -> a) -> b -> b -> Ordering
comparing forall a. NamedThing a => a -> OccName
getOccName) [Var]
ids)
  where
    ids :: [Var]
ids = [Var
id | Var
id <- TypeEnv -> [Var]
typeEnvIds TypeEnv
type_env, Var -> Bool
want_sig Var
id]
    want_sig :: Var -> Bool
want_sig Var
id
      | Bool
debug     = Bool
True
      | Bool
otherwise = forall x. NamedThing x => x -> Bool
hasTopUserName Var
id
                    Bool -> Bool -> Bool
&& case Var -> IdDetails
idDetails Var
id of
                         IdDetails
VanillaId    -> Bool
True
                         RecSelId {}  -> Bool
True
                         ClassOpId {} -> Bool
True
                         FCallId {}   -> Bool
True
                         IdDetails
_            -> Bool
False
             -- Data cons (workers and wrappers), pattern synonyms,
             -- etc are suppressed (unless -dppr-debug),
             -- because they appear elsewhere

    ppr_sig :: Var -> SDoc
ppr_sig Var
id = SDoc -> Arity -> SDoc -> SDoc
hang (forall a. OutputableBndr a => a -> SDoc
pprPrefixOcc Var
id SDoc -> SDoc -> SDoc
<+> SDoc
dcolon) Arity
2 (forall a. Outputable a => a -> SDoc
ppr (Type -> Type
tidyTopType (Var -> Type
idType Var
id)))

ppr_tycons :: Bool -> [FamInst] -> TypeEnv -> SDoc
ppr_tycons :: Bool -> [FamInst] -> TypeEnv -> SDoc
ppr_tycons Bool
debug [FamInst]
fam_insts TypeEnv
type_env
  = [SDoc] -> SDoc
vcat [ forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
"TYPE CONSTRUCTORS" TyCon -> SDoc
ppr_tc [TyCon]
tycons
         , forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
"COERCION AXIOMS" forall {br :: BranchFlag}. CoAxiom br -> SDoc
ppr_ax
                      (TypeEnv -> [CoAxiom Branched]
typeEnvCoAxioms TypeEnv
type_env) ]
  where
    fi_tycons :: [TyCon]
fi_tycons = [FamInst] -> [TyCon]
famInstsRepTyCons [FamInst]
fam_insts

    tycons :: [TyCon]
tycons = forall a. (a -> a -> Ordering) -> [a] -> [a]
sortBy (forall a b. Ord a => (b -> a) -> b -> b -> Ordering
comparing forall a. NamedThing a => a -> OccName
getOccName) forall a b. (a -> b) -> a -> b
$
             [TyCon
tycon | TyCon
tycon <- TypeEnv -> [TyCon]
typeEnvTyCons TypeEnv
type_env
                    , TyCon -> Bool
want_tycon TyCon
tycon]
             -- Sort by OccName to reduce unnecessary changes
    want_tycon :: TyCon -> Bool
want_tycon TyCon
tycon | Bool
debug      = Bool
True
                     | Bool
otherwise  = Name -> Bool
isExternalName (TyCon -> Name
tyConName TyCon
tycon) Bool -> Bool -> Bool
&&
                                    Bool -> Bool
not (TyCon
tycon forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [TyCon]
fi_tycons)
    ppr_tc :: TyCon -> SDoc
ppr_tc TyCon
tc
       = [SDoc] -> SDoc
vcat [ SDoc -> Arity -> SDoc -> SDoc
hang (forall a. Outputable a => a -> SDoc
ppr (TyCon -> TyConFlavour
tyConFlavour TyCon
tc) SDoc -> SDoc -> SDoc
<+> forall a. OutputableBndr a => a -> SDoc
pprPrefixOcc (TyCon -> Name
tyConName TyCon
tc)
                      SDoc -> SDoc -> SDoc
<> SDoc -> SDoc
braces (forall a. Outputable a => a -> SDoc
ppr (TyCon -> Arity
tyConArity TyCon
tc)) SDoc -> SDoc -> SDoc
<+> SDoc
dcolon)
                   Arity
2 (forall a. Outputable a => a -> SDoc
ppr (Type -> Type
tidyTopType (TyCon -> Type
tyConKind TyCon
tc)))
              , Arity -> SDoc -> SDoc
nest Arity
2 forall a b. (a -> b) -> a -> b
$
                Bool -> SDoc -> SDoc
ppWhen Bool
show_roles forall a b. (a -> b) -> a -> b
$
                String -> SDoc
text String
"roles" SDoc -> SDoc -> SDoc
<+> ([SDoc] -> SDoc
sep (forall a b. (a -> b) -> [a] -> [b]
map forall a. Outputable a => a -> SDoc
ppr [Role]
roles)) ]
       where
         show_roles :: Bool
show_roles = Bool
debug Bool -> Bool -> Bool
|| Bool -> Bool
not (forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all (forall a. Eq a => a -> a -> Bool
== Role
boring_role) [Role]
roles)
         roles :: [Role]
roles = TyCon -> [Role]
tyConRoles TyCon
tc
         boring_role :: Role
boring_role | TyCon -> Bool
isClassTyCon TyCon
tc = Role
Nominal
                     | Bool
otherwise       = Role
Representational
            -- Matches the choice in GHC.Iface.Syntax, calls to pprRoles

    ppr_ax :: CoAxiom br -> SDoc
ppr_ax CoAxiom br
ax = forall a. Outputable a => a -> SDoc
ppr (forall (br :: BranchFlag). CoAxiom br -> IfaceDecl
coAxiomToIfaceDecl CoAxiom br
ax)
      -- We go via IfaceDecl rather than using pprCoAxiom
      -- This way we get the full axiom (both LHS and RHS) with
      -- wildcard binders tidied to _1, _2, etc.

ppr_datacons :: Bool -> TypeEnv -> SDoc
ppr_datacons :: Bool -> TypeEnv -> SDoc
ppr_datacons Bool
debug TypeEnv
type_env
  = forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
"DATA CONSTRUCTORS" DataCon -> SDoc
ppr_dc [DataCon]
wanted_dcs
      -- The filter gets rid of class data constructors
  where
    ppr_dc :: DataCon -> SDoc
ppr_dc DataCon
dc = forall a. (SDocContext -> a) -> (a -> SDoc) -> SDoc
sdocOption SDocContext -> Bool
sdocLinearTypes (\Bool
show_linear_types ->
                forall a. Outputable a => a -> SDoc
ppr DataCon
dc SDoc -> SDoc -> SDoc
<+> SDoc
dcolon SDoc -> SDoc -> SDoc
<+> forall a. Outputable a => a -> SDoc
ppr (Bool -> DataCon -> Type
dataConDisplayType Bool
show_linear_types DataCon
dc))
    all_dcs :: [DataCon]
all_dcs    = TypeEnv -> [DataCon]
typeEnvDataCons TypeEnv
type_env
    wanted_dcs :: [DataCon]
wanted_dcs | Bool
debug     = [DataCon]
all_dcs
               | Bool
otherwise = forall a. (a -> Bool) -> [a] -> [a]
filterOut DataCon -> Bool
is_cls_dc [DataCon]
all_dcs
    is_cls_dc :: DataCon -> Bool
is_cls_dc DataCon
dc = TyCon -> Bool
isClassTyCon (DataCon -> TyCon
dataConTyCon DataCon
dc)

ppr_patsyns :: TypeEnv -> SDoc
ppr_patsyns :: TypeEnv -> SDoc
ppr_patsyns TypeEnv
type_env
  = forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
"PATTERN SYNONYMS" PatSyn -> SDoc
ppr_ps
               (TypeEnv -> [PatSyn]
typeEnvPatSyns TypeEnv
type_env)
  where
    ppr_ps :: PatSyn -> SDoc
ppr_ps PatSyn
ps = forall a. OutputableBndr a => a -> SDoc
pprPrefixOcc PatSyn
ps SDoc -> SDoc -> SDoc
<+> SDoc
dcolon SDoc -> SDoc -> SDoc
<+> PatSyn -> SDoc
pprPatSynType PatSyn
ps

ppr_insts :: [ClsInst] -> SDoc
ppr_insts :: [ClsInst] -> SDoc
ppr_insts [ClsInst]
ispecs
  = forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
"CLASS INSTANCES" ClsInst -> SDoc
pprInstance [ClsInst]
ispecs

ppr_fam_insts :: [FamInst] -> SDoc
ppr_fam_insts :: [FamInst] -> SDoc
ppr_fam_insts [FamInst]
fam_insts
  = forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
"FAMILY INSTANCES" FamInst -> SDoc
pprFamInst [FamInst]
fam_insts

ppr_things :: String -> (a -> SDoc) -> [a] -> SDoc
ppr_things :: forall a. String -> (a -> SDoc) -> [a] -> SDoc
ppr_things String
herald a -> SDoc
ppr_one [a]
things
  | forall (t :: * -> *) a. Foldable t => t a -> Bool
null [a]
things = SDoc
empty
  | Bool
otherwise   = String -> SDoc
text String
herald SDoc -> SDoc -> SDoc
$$ Arity -> SDoc -> SDoc
nest Arity
2 ([SDoc] -> SDoc
vcat (forall a b. (a -> b) -> [a] -> [b]
map a -> SDoc
ppr_one [a]
things))

hasTopUserName :: NamedThing x => x -> Bool
-- A top-level thing whose name is not "derived"
-- Thus excluding things like $tcX, from Typeable boilerplate
-- and C:Coll from class-dictionary data constructors
hasTopUserName :: forall x. NamedThing x => x -> Bool
hasTopUserName x
x
  = Name -> Bool
isExternalName Name
name Bool -> Bool -> Bool
&& Bool -> Bool
not (OccName -> Bool
isDerivedOccName (Name -> OccName
nameOccName Name
name))
  where
    name :: Name
name = forall a. NamedThing a => a -> Name
getName x
x

{-
********************************************************************************

Type Checker Plugins

********************************************************************************
-}

withTcPlugins :: HscEnv -> TcM a -> TcM a
withTcPlugins :: forall a. HscEnv -> TcM a -> TcM a
withTcPlugins HscEnv
hsc_env TcM a
m =
    case HscEnv -> [TcPlugin]
getTcPlugins HscEnv
hsc_env of
       []      -> TcM a
m  -- Common fast case
       [TcPlugin]
plugins -> do
                EvBindsVar
ev_binds_var <- TcM EvBindsVar
newTcEvBinds
                ([TcPluginSolver]
solvers,[TcPluginM ()]
stops) <- forall a b. [(a, b)] -> ([a], [b])
unzip forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
`fmap` forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (EvBindsVar
-> TcPlugin
-> IOEnv (Env TcGblEnv TcLclEnv) (TcPluginSolver, TcPluginM ())
startPlugin EvBindsVar
ev_binds_var) [TcPlugin]
plugins
                -- This ensures that tcPluginStop is called even if a type
                -- error occurs during compilation (Fix of #10078)
                Either IOEnvFailure a
eitherRes <- forall env r. IOEnv env r -> IOEnv env (Either IOEnvFailure r)
tryM forall a b. (a -> b) -> a -> b
$
                  forall gbl lcl a.
(gbl -> gbl) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updGblEnv (\TcGblEnv
e -> TcGblEnv
e { tcg_tc_plugins :: [TcPluginSolver]
tcg_tc_plugins = [TcPluginSolver]
solvers }) TcM a
m
                forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (forall a b c. (a -> b -> c) -> b -> a -> c
flip forall a. TcPluginM a -> EvBindsVar -> TcM a
runTcPluginM EvBindsVar
ev_binds_var) [TcPluginM ()]
stops
                case Either IOEnvFailure a
eitherRes of
                  Left IOEnvFailure
_ -> forall env a. IOEnv env a
failM
                  Right a
res -> forall (m :: * -> *) a. Monad m => a -> m a
return a
res
  where
  startPlugin :: EvBindsVar
-> TcPlugin
-> IOEnv (Env TcGblEnv TcLclEnv) (TcPluginSolver, TcPluginM ())
startPlugin EvBindsVar
ev_binds_var (TcPlugin TcPluginM s
start s -> TcPluginSolver
solve s -> TcPluginM ()
stop) =
    do s
s <- forall a. TcPluginM a -> EvBindsVar -> TcM a
runTcPluginM TcPluginM s
start EvBindsVar
ev_binds_var
       forall (m :: * -> *) a. Monad m => a -> m a
return (s -> TcPluginSolver
solve s
s, s -> TcPluginM ()
stop s
s)

getTcPlugins :: HscEnv -> [GHC.Tc.Utils.Monad.TcPlugin]
getTcPlugins :: HscEnv -> [TcPlugin]
getTcPlugins HscEnv
hsc_env = forall a. [Maybe a] -> [a]
catMaybes forall a b. (a -> b) -> a -> b
$ forall a. HscEnv -> (Plugin -> [String] -> a) -> [a]
mapPlugins HscEnv
hsc_env (\Plugin
p [String]
args -> Plugin -> [String] -> Maybe TcPlugin
tcPlugin Plugin
p [String]
args)


withHoleFitPlugins :: HscEnv -> TcM a -> TcM a
withHoleFitPlugins :: forall a. HscEnv -> TcM a -> TcM a
withHoleFitPlugins HscEnv
hsc_env TcM a
m =
  case HscEnv -> [HoleFitPluginR]
getHfPlugins HscEnv
hsc_env of
    [] -> TcM a
m  -- Common fast case
    [HoleFitPluginR]
plugins -> do ([HoleFitPlugin]
plugins,[TcRnIf TcGblEnv TcLclEnv ()]
stops) <- forall a b. [(a, b)] -> ([a], [b])
unzip forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
`fmap` forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM HoleFitPluginR
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (HoleFitPlugin, TcRnIf TcGblEnv TcLclEnv ())
startPlugin [HoleFitPluginR]
plugins
                  -- This ensures that hfPluginStop is called even if a type
                  -- error occurs during compilation.
                  Either IOEnvFailure a
eitherRes <- forall env r. IOEnv env r -> IOEnv env (Either IOEnvFailure r)
tryM forall a b. (a -> b) -> a -> b
$
                    forall gbl lcl a.
(gbl -> gbl) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updGblEnv (\TcGblEnv
e -> TcGblEnv
e { tcg_hf_plugins :: [HoleFitPlugin]
tcg_hf_plugins = [HoleFitPlugin]
plugins }) TcM a
m
                  forall (t :: * -> *) (m :: * -> *) a.
(Foldable t, Monad m) =>
t (m a) -> m ()
sequence_ [TcRnIf TcGblEnv TcLclEnv ()]
stops
                  case Either IOEnvFailure a
eitherRes of
                    Left IOEnvFailure
_ -> forall env a. IOEnv env a
failM
                    Right a
res -> forall (m :: * -> *) a. Monad m => a -> m a
return a
res
  where
    startPlugin :: HoleFitPluginR
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (HoleFitPlugin, TcRnIf TcGblEnv TcLclEnv ())
startPlugin (HoleFitPluginR TcM (TcRef s)
init TcRef s -> HoleFitPlugin
plugin TcRef s -> TcRnIf TcGblEnv TcLclEnv ()
stop) =
      do TcRef s
ref <- TcM (TcRef s)
init
         forall (m :: * -> *) a. Monad m => a -> m a
return (TcRef s -> HoleFitPlugin
plugin TcRef s
ref, TcRef s -> TcRnIf TcGblEnv TcLclEnv ()
stop TcRef s
ref)

getHfPlugins :: HscEnv -> [HoleFitPluginR]
getHfPlugins :: HscEnv -> [HoleFitPluginR]
getHfPlugins HscEnv
hsc_env =
  forall a. [Maybe a] -> [a]
catMaybes forall a b. (a -> b) -> a -> b
$ forall a. HscEnv -> (Plugin -> [String] -> a) -> [a]
mapPlugins HscEnv
hsc_env (\Plugin
p [String]
args -> Plugin -> [String] -> Maybe HoleFitPluginR
holeFitPlugin Plugin
p [String]
args)


runRenamerPlugin :: TcGblEnv
                 -> HsGroup GhcRn
                 -> TcM (TcGblEnv, HsGroup GhcRn)
runRenamerPlugin :: TcGblEnv
-> HsGroup (GhcPass 'Renamed)
-> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
runRenamerPlugin TcGblEnv
gbl_env HsGroup (GhcPass 'Renamed)
hs_group = do
    HscEnv
hsc_env <- forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
    forall (m :: * -> *) a.
Monad m =>
HscEnv -> PluginOperation m a -> a -> m a
withPlugins HscEnv
hsc_env
      (\Plugin
p [String]
opts (TcGblEnv
e, HsGroup (GhcPass 'Renamed)
g) -> ( DynFlags -> TcRnIf TcGblEnv TcLclEnv ()
mark_plugin_unsafe (HscEnv -> DynFlags
hsc_dflags HscEnv
hsc_env)
                            forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Plugin
-> [String]
-> TcGblEnv
-> HsGroup (GhcPass 'Renamed)
-> TcM (TcGblEnv, HsGroup (GhcPass 'Renamed))
renamedResultAction Plugin
p [String]
opts TcGblEnv
e HsGroup (GhcPass 'Renamed)
g))
      (TcGblEnv
gbl_env, HsGroup (GhcPass 'Renamed)
hs_group)


-- XXX: should this really be a Maybe X?  Check under which circumstances this
-- can become a Nothing and decide whether this should instead throw an
-- exception/signal an error.
type RenamedStuff =
        (Maybe (HsGroup GhcRn, [LImportDecl GhcRn], Maybe [(LIE GhcRn, Avails)],
                Maybe LHsDocString))

-- | Extract the renamed information from TcGblEnv.
getRenamedStuff :: TcGblEnv -> RenamedStuff
getRenamedStuff :: TcGblEnv -> RenamedStuff
getRenamedStuff TcGblEnv
tc_result
  = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (\HsGroup (GhcPass 'Renamed)
decls -> ( HsGroup (GhcPass 'Renamed)
decls, TcGblEnv -> [LImportDecl (GhcPass 'Renamed)]
tcg_rn_imports TcGblEnv
tc_result
                    , TcGblEnv -> Maybe [(LIE (GhcPass 'Renamed), [AvailInfo])]
tcg_rn_exports TcGblEnv
tc_result, TcGblEnv -> Maybe LHsDocString
tcg_doc_hdr TcGblEnv
tc_result ) )
         (TcGblEnv -> Maybe (HsGroup (GhcPass 'Renamed))
tcg_rn_decls TcGblEnv
tc_result)

runTypecheckerPlugin :: ModSummary -> TcGblEnv -> TcM TcGblEnv
runTypecheckerPlugin :: ModSummary -> TcGblEnv -> TcM TcGblEnv
runTypecheckerPlugin ModSummary
sum TcGblEnv
gbl_env = do
    HscEnv
hsc_env <- forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
    forall (m :: * -> *) a.
Monad m =>
HscEnv -> PluginOperation m a -> a -> m a
withPlugins HscEnv
hsc_env
      (\Plugin
p [String]
opts TcGblEnv
env -> DynFlags -> TcRnIf TcGblEnv TcLclEnv ()
mark_plugin_unsafe (HscEnv -> DynFlags
hsc_dflags HscEnv
hsc_env)
                        forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Plugin -> [String] -> ModSummary -> TcGblEnv -> TcM TcGblEnv
typeCheckResultAction Plugin
p [String]
opts ModSummary
sum TcGblEnv
env)
      TcGblEnv
gbl_env

mark_plugin_unsafe :: DynFlags -> TcM ()
mark_plugin_unsafe :: DynFlags -> TcRnIf TcGblEnv TcLclEnv ()
mark_plugin_unsafe DynFlags
dflags = forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless (GeneralFlag -> DynFlags -> Bool
gopt GeneralFlag
Opt_PluginTrustworthy DynFlags
dflags) forall a b. (a -> b) -> a -> b
$
  WarningMessages -> TcRnIf TcGblEnv TcLclEnv ()
recordUnsafeInfer WarningMessages
pluginUnsafe
  where
    unsafeText :: String
unsafeText = String
"Use of plugins makes the module unsafe"
    pluginUnsafe :: WarningMessages
pluginUnsafe = forall a. a -> Bag a
unitBag ( SrcSpan -> SDoc -> MsgEnvelope DecoratedSDoc
mkPlainWarnMsg SrcSpan
noSrcSpan
                                   (String -> SDoc
Outputable.text String
unsafeText) )