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

Extracting imported and top-level names in scope
-}

{-# LANGUAGE NondecreasingIndentation #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE LambdaCase #-}

module GHC.Rename.Names (
        rnImports, getLocalNonValBinders, newRecordFieldLabel,
        extendGlobalRdrEnvRn,
        gresFromAvails,
        calculateAvails,
        reportUnusedNames,
        checkConName,
        mkChildEnv,
        findChildren,
        findImportUsage,
        getMinimalImports,
        printMinimalImports,
        renamePkgQual, renameRawPkgQual,
        classifyGREs,
        ImportDeclUsage,
    ) where

import GHC.Prelude hiding ( head, init, last, tail )

import GHC.Driver.Env
import GHC.Driver.Session
import GHC.Driver.Ppr

import GHC.Rename.Env
import GHC.Rename.Fixity
import GHC.Rename.Utils ( warnUnusedTopBinds )
import GHC.Rename.Unbound
import qualified GHC.Rename.Unbound as Unbound

import GHC.Tc.Errors.Types
import GHC.Tc.Utils.Env
import GHC.Tc.Utils.Monad
import GHC.Tc.Types.LclEnv
import GHC.Tc.Zonk.TcType ( tcInitTidyEnv )

import GHC.Hs
import GHC.Iface.Load   ( loadSrcInterface )
import GHC.Iface.Syntax ( fromIfaceWarnings )
import GHC.Builtin.Names
import GHC.Parser.PostProcess ( setRdrNameSpace )
import GHC.Core.Type
import GHC.Core.PatSyn
import GHC.Core.TyCon ( TyCon, tyConName )
import qualified GHC.LanguageExtensions as LangExt

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

import GHC.Types.Fixity.Env
import GHC.Types.SafeHaskell
import GHC.Types.Name
import GHC.Types.Name.Env
import GHC.Types.Name.Set
import GHC.Types.Name.Reader
import GHC.Types.Avail
import GHC.Types.FieldLabel
import GHC.Types.Hint
import GHC.Types.SourceFile
import GHC.Types.SrcLoc as SrcLoc
import GHC.Types.Basic  ( TopLevelFlag(..) )
import GHC.Types.SourceText
import GHC.Types.Id
import GHC.Types.HpcInfo
import GHC.Types.PkgQual
import GHC.Types.GREInfo (ConInfo(..))

import GHC.Unit
import GHC.Unit.Module.Warnings
import GHC.Unit.Module.ModIface
import GHC.Unit.Module.Imported
import GHC.Unit.Module.Deps
import GHC.Unit.Env

import GHC.Data.Bag
import GHC.Data.FastString
import GHC.Data.FastString.Env
import GHC.Data.Maybe
import GHC.Data.List.SetOps ( removeDups )

import Control.Monad
import Data.Foldable    ( for_ )
import Data.IntMap      ( IntMap )
import qualified Data.IntMap as IntMap
import Data.Map         ( Map )
import qualified Data.Map as Map
import Data.Ord         ( comparing )
import Data.List        ( partition, find, sortBy )
import Data.List.NonEmpty (NonEmpty(..))
import qualified Data.List.NonEmpty as NE
import Data.Function    ( on )
import qualified Data.Set as S
import System.FilePath  ((</>))
import System.IO


{-
************************************************************************
*                                                                      *
\subsection{rnImports}
*                                                                      *
************************************************************************

Note [Tracking Trust Transitively]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When we import a package as well as checking that the direct imports are safe
according to the rules outlined in the Note [Safe Haskell Trust Check] in GHC.Driver.Main
we must also check that these rules hold transitively for all dependent modules
and packages. Doing this without caching any trust information would be very
slow as we would need to touch all packages and interface files a module depends
on. To avoid this we make use of the property that if a modules Safe Haskell
mode changes, this triggers a recompilation from that module in the dependency
graph. So we can just worry mostly about direct imports.

There is one trust property that can change for a package though without
recompilation being triggered: package trust. So we must check that all
packages a module transitively depends on to be trusted are still trusted when
we are compiling this module (as due to recompilation avoidance some modules
below may not be considered trusted any more without recompilation being
triggered).

We handle this by augmenting the existing transitive list of packages a module M
depends on with a bool for each package that says if it must be trusted when the
module M is being checked for trust. This list of trust required packages for a
single import is gathered in the rnImportDecl function and stored in an
ImportAvails data structure. The union of these trust required packages for all
imports is done by the rnImports function using the combine function which calls
the plusImportAvails function that is a union operation for the ImportAvails
type. This gives us in an ImportAvails structure all packages required to be
trusted for the module we are currently compiling. Checking that these packages
are still trusted (and that direct imports are trusted) is done in
GHC.Driver.Main.checkSafeImports.

See the note below, [Trust Own Package] for a corner case in this method and
how its handled.


Note [Trust Own Package]
~~~~~~~~~~~~~~~~~~~~~~~~
There is a corner case of package trust checking that the usual transitive check
doesn't cover. (For how the usual check operates see the Note [Tracking Trust
Transitively] below). The case is when you import a -XSafe module M and M
imports a -XTrustworthy module N. If N resides in a different package than M,
then the usual check works as M will record a package dependency on N's package
and mark it as required to be trusted. If N resides in the same package as M
though, then importing M should require its own package be trusted due to N
(since M is -XSafe so doesn't create this requirement by itself). The usual
check fails as a module doesn't record a package dependency of its own package.
So instead we now have a bool field in a modules interface file that simply
states if the module requires its own package to be trusted. This field avoids
us having to load all interface files that the module depends on to see if one
is trustworthy.


Note [Trust Transitive Property]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
So there is an interesting design question in regards to transitive trust
checking. Say I have a module B compiled with -XSafe. B is dependent on a bunch
of modules and packages, some packages it requires to be trusted as its using
-XTrustworthy modules from them. Now if I have a module A that doesn't use safe
haskell at all and simply imports B, should A inherit all the trust
requirements from B? Should A now also require that a package p is trusted since
B required it?

We currently say no but saying yes also makes sense. The difference is, if a
module M that doesn't use Safe Haskell imports a module N that does, should all
the trusted package requirements be dropped since M didn't declare that it cares
about Safe Haskell (so -XSafe is more strongly associated with the module doing
the importing) or should it be done still since the author of the module N that
uses Safe Haskell said they cared (so -XSafe is more strongly associated with
the module that was compiled that used it).

Going with yes is a simpler semantics we think and harder for the user to stuff
up but it does mean that Safe Haskell will affect users who don't care about
Safe Haskell as they might grab a package from Cabal which uses safe haskell (say
network) and that packages imports -XTrustworthy modules from another package
(say bytestring), so requires that package is trusted. The user may now get
compilation errors in code that doesn't do anything with Safe Haskell simply
because they are using the network package. They will have to call 'ghc-pkg
trust network' to get everything working. Due to this invasive nature of going
with yes we have gone with no for now.
-}

-- | Process Import Decls.  See 'rnImportDecl' for a description of what
-- the return types represent.
-- Note: Do the non SOURCE ones first, so that we get a helpful warning
-- for SOURCE ones that are unnecessary
rnImports :: [(LImportDecl GhcPs, SDoc)]
          -> RnM ([LImportDecl GhcRn], GlobalRdrEnv, ImportAvails, AnyHpcUsage)
rnImports :: [(LImportDecl (GhcPass 'Parsed), SDoc)]
-> RnM ([LImportDecl GhcRn], GlobalRdrEnv, ImportAvails, Bool)
rnImports [(LImportDecl (GhcPass 'Parsed), SDoc)]
imports = do
    TcGblEnv
tcg_env <- TcRnIf TcGblEnv TcLclEnv TcGblEnv
forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
    -- NB: want an identity module here, because it's OK for a signature
    -- module to import from its implementor
    let this_mod :: Module
this_mod = TcGblEnv -> Module
tcg_mod TcGblEnv
tcg_env
    let ([(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
source, [(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
ordinary) = ((GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)
 -> Bool)
-> [(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
-> ([(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)),
      SDoc)],
    [(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)])
forall a. (a -> Bool) -> [a] -> ([a], [a])
partition (GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)) -> Bool
forall {l} {pass}. GenLocated l (ImportDecl pass) -> Bool
is_source_import (GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)) -> Bool)
-> ((GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)
    -> GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)))
-> (GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)
-> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)
-> GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed))
forall a b. (a, b) -> a
fst) [(LImportDecl (GhcPass 'Parsed), SDoc)]
[(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
imports
        is_source_import :: GenLocated l (ImportDecl pass) -> Bool
is_source_import GenLocated l (ImportDecl pass)
d = ImportDecl pass -> IsBootInterface
forall pass. ImportDecl pass -> IsBootInterface
ideclSource (GenLocated l (ImportDecl pass) -> ImportDecl pass
forall l e. GenLocated l e -> e
unLoc GenLocated l (ImportDecl pass)
d) IsBootInterface -> IsBootInterface -> Bool
forall a. Eq a => a -> a -> Bool
== IsBootInterface
IsBoot
    [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
  ImportAvails, Bool)]
stuff1 <- ((GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)
 -> TcRn
      (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
       ImportAvails, Bool))
-> [(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
-> TcRn
     [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
       ImportAvails, Bool)]
forall a b. (a -> TcRn b) -> [a] -> TcRn [b]
mapAndReportM (Module
-> (LImportDecl (GhcPass 'Parsed), SDoc)
-> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
rnImportDecl Module
this_mod) [(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
ordinary
    [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
  ImportAvails, Bool)]
stuff2 <- ((GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)
 -> TcRn
      (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
       ImportAvails, Bool))
-> [(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
-> TcRn
     [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
       ImportAvails, Bool)]
forall a b. (a -> TcRn b) -> [a] -> TcRn [b]
mapAndReportM (Module
-> (LImportDecl (GhcPass 'Parsed), SDoc)
-> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
rnImportDecl Module
this_mod) [(GenLocated SrcSpanAnnA (ImportDecl (GhcPass 'Parsed)), SDoc)]
source
    -- Safe Haskell: See Note [Tracking Trust Transitively]
    let ([LImportDecl GhcRn]
decls, GlobalRdrEnv
rdr_env, ImportAvails
imp_avails, Bool
hpc_usage) = [(LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)]
-> ([LImportDecl GhcRn], GlobalRdrEnv, ImportAvails, Bool)
combine ([(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
  ImportAvails, Bool)]
stuff1 [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
  ImportAvails, Bool)]
-> [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
     ImportAvails, Bool)]
-> [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
     ImportAvails, Bool)]
forall a. [a] -> [a] -> [a]
++ [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
  ImportAvails, Bool)]
stuff2)
    -- Update imp_boot_mods if imp_direct_mods mentions any of them
    let merged_import_avail :: ImportAvails
merged_import_avail = ImportAvails -> ImportAvails
clobberSourceImports ImportAvails
imp_avails
    DynFlags
dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
    let final_import_avail :: ImportAvails
final_import_avail  =
          ImportAvails
merged_import_avail { imp_dep_direct_pkgs = S.fromList (implicitPackageDeps dflags)
                                                        `S.union` imp_dep_direct_pkgs merged_import_avail}
    ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
 ImportAvails, Bool)
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
      ImportAvails, Bool)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ([LImportDecl GhcRn]
[GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
decls, GlobalRdrEnv
rdr_env, ImportAvails
final_import_avail, Bool
hpc_usage)

  where
    clobberSourceImports :: ImportAvails -> ImportAvails
clobberSourceImports ImportAvails
imp_avails =
      ImportAvails
imp_avails { imp_boot_mods = imp_boot_mods' }
      where
        imp_boot_mods' :: InstalledModuleEnv (GenWithIsBoot ModuleName)
imp_boot_mods' = (GenWithIsBoot ModuleName
 -> GenWithIsBoot ModuleName -> Maybe (GenWithIsBoot ModuleName))
-> (InstalledModuleEnv (GenWithIsBoot ModuleName)
    -> InstalledModuleEnv (GenWithIsBoot ModuleName))
-> (InstalledModuleEnv (GenWithIsBoot ModuleName)
    -> InstalledModuleEnv (GenWithIsBoot ModuleName))
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
forall elta eltb eltc.
(elta -> eltb -> Maybe eltc)
-> (InstalledModuleEnv elta -> InstalledModuleEnv eltc)
-> (InstalledModuleEnv eltb -> InstalledModuleEnv eltc)
-> InstalledModuleEnv elta
-> InstalledModuleEnv eltb
-> InstalledModuleEnv eltc
mergeInstalledModuleEnv GenWithIsBoot ModuleName
-> GenWithIsBoot ModuleName -> Maybe (GenWithIsBoot ModuleName)
forall {mod}.
GenWithIsBoot mod -> GenWithIsBoot mod -> Maybe (GenWithIsBoot mod)
combJ InstalledModuleEnv (GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
forall a. a -> a
id (InstalledModuleEnv (GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
forall a b. a -> b -> a
const InstalledModuleEnv (GenWithIsBoot ModuleName)
forall a. InstalledModuleEnv a
emptyInstalledModuleEnv)
                            (ImportAvails -> InstalledModuleEnv (GenWithIsBoot ModuleName)
imp_boot_mods ImportAvails
imp_avails)
                            (ImportAvails -> InstalledModuleEnv (GenWithIsBoot ModuleName)
imp_direct_dep_mods ImportAvails
imp_avails)

        combJ :: GenWithIsBoot mod -> GenWithIsBoot mod -> Maybe (GenWithIsBoot mod)
combJ (GWIB mod
_ IsBootInterface
IsBoot) GenWithIsBoot mod
x = GenWithIsBoot mod -> Maybe (GenWithIsBoot mod)
forall a. a -> Maybe a
Just GenWithIsBoot mod
x
        combJ GenWithIsBoot mod
r GenWithIsBoot mod
_               = GenWithIsBoot mod -> Maybe (GenWithIsBoot mod)
forall a. a -> Maybe a
Just GenWithIsBoot mod
r
    -- See Note [Combining ImportAvails]
    combine :: [(LImportDecl GhcRn,  GlobalRdrEnv, ImportAvails, AnyHpcUsage)]
            -> ([LImportDecl GhcRn], GlobalRdrEnv, ImportAvails, AnyHpcUsage)
    combine :: [(LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)]
-> ([LImportDecl GhcRn], GlobalRdrEnv, ImportAvails, Bool)
combine [(LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)]
ss =
      let ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
decls, GlobalRdrEnv
rdr_env, ImportAvails
imp_avails, Bool
hpc_usage, ModuleSet
finsts) = ((GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
  ImportAvails, Bool)
 -> ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
     ImportAvails, Bool, ModuleSet)
 -> ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
     ImportAvails, Bool, ModuleSet))
-> ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
    ImportAvails, Bool, ModuleSet)
-> [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
     ImportAvails, Bool)]
-> ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
    ImportAvails, Bool, ModuleSet)
forall a b. (a -> b -> b) -> b -> [a] -> b
forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr
            (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
 ImportAvails, Bool)
-> ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
    ImportAvails, Bool, ModuleSet)
-> ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)], GlobalRdrEnv,
    ImportAvails, Bool, ModuleSet)
forall {a}.
(a, GlobalRdrEnv, ImportAvails, Bool)
-> ([a], GlobalRdrEnv, ImportAvails, Bool, ModuleSet)
-> ([a], GlobalRdrEnv, ImportAvails, Bool, ModuleSet)
plus
            ([], GlobalRdrEnv
forall info. GlobalRdrEnvX info
emptyGlobalRdrEnv, ImportAvails
emptyImportAvails, Bool
False, ModuleSet
emptyModuleSet)
            [(LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)]
[(GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
  ImportAvails, Bool)]
ss
      in ([LImportDecl GhcRn]
[GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
decls, GlobalRdrEnv
rdr_env, ImportAvails
imp_avails { imp_finsts = moduleSetElts finsts },
            Bool
hpc_usage)

    plus :: (a, GlobalRdrEnv, ImportAvails, Bool)
-> ([a], GlobalRdrEnv, ImportAvails, Bool, ModuleSet)
-> ([a], GlobalRdrEnv, ImportAvails, Bool, ModuleSet)
plus (a
decl,  GlobalRdrEnv
gbl_env1, ImportAvails
imp_avails1, Bool
hpc_usage1)
         ([a]
decls, GlobalRdrEnv
gbl_env2, ImportAvails
imp_avails2, Bool
hpc_usage2, ModuleSet
finsts_set)
      = ( a
decla -> [a] -> [a]
forall a. a -> [a] -> [a]
:[a]
decls,
          GlobalRdrEnv
gbl_env1 GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
`plusGlobalRdrEnv` GlobalRdrEnv
gbl_env2,
          ImportAvails
imp_avails1' ImportAvails -> ImportAvails -> ImportAvails
`plusImportAvails` ImportAvails
imp_avails2,
          Bool
hpc_usage1 Bool -> Bool -> Bool
|| Bool
hpc_usage2,
          ModuleSet -> [Module] -> ModuleSet
extendModuleSetList ModuleSet
finsts_set [Module]
new_finsts )
      where
      imp_avails1' :: ImportAvails
imp_avails1' = ImportAvails
imp_avails1 { imp_finsts = [] }
      new_finsts :: [Module]
new_finsts = ImportAvails -> [Module]
imp_finsts ImportAvails
imp_avails1

{-
Note [Combining ImportAvails]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
imp_finsts in ImportAvails is a list of family instance modules
transitively depended on by an import. imp_finsts for a currently
compiled module is a union of all the imp_finsts of imports.
Computing the union of two lists of size N is O(N^2) and if we
do it to M imports we end up with O(M*N^2). That can get very
expensive for bigger module hierarchies.

Union can be optimized to O(N log N) if we use a Set.
imp_finsts is converted back and forth between dep_finsts, so
changing a type of imp_finsts means either paying for the conversions
or changing the type of dep_finsts as well.

I've measured that the conversions would cost 20% of allocations on my
test case, so that can be ruled out.

Changing the type of dep_finsts forces checkFamInsts to
get the module lists in non-deterministic order. If we wanted to restore
the deterministic order, we'd have to sort there, which is an additional
cost. As far as I can tell, using a non-deterministic order is fine there,
but that's a brittle nonlocal property which I'd like to avoid.

Additionally, dep_finsts is read from an interface file, so its "natural"
type is a list. Which makes it a natural type for imp_finsts.

Since rnImports.combine is really the only place that would benefit from
it being a Set, it makes sense to optimize the hot loop in rnImports.combine
without changing the representation.

So here's what we do: instead of naively merging ImportAvails with
plusImportAvails in a loop, we make plusImportAvails merge empty imp_finsts
and compute the union on the side using Sets. When we're done, we can
convert it back to a list. One nice side effect of this approach is that
if there's a lot of overlap in the imp_finsts of imports, the
Set doesn't really need to grow and we don't need to allocate.

Running generateModules from #14693 with DEPTH=16, WIDTH=30 finishes in
23s before, and 11s after.
-}



-- | Given a located import declaration @decl@ from @this_mod@,
-- calculate the following pieces of information:
--
--  1. An updated 'LImportDecl', where all unresolved 'RdrName' in
--     the entity lists have been resolved into 'Name's,
--
--  2. A 'GlobalRdrEnv' representing the new identifiers that were
--     brought into scope (taking into account module qualification
--     and hiding),
--
--  3. 'ImportAvails' summarizing the identifiers that were imported
--     by this declaration, and
--
--  4. A boolean 'AnyHpcUsage' which is true if the imported module
--     used HPC.
rnImportDecl :: Module -> (LImportDecl GhcPs, SDoc)
             -> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, AnyHpcUsage)
rnImportDecl :: Module
-> (LImportDecl (GhcPass 'Parsed), SDoc)
-> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
rnImportDecl Module
this_mod
             (L SrcSpanAnnA
loc decl :: ImportDecl (GhcPass 'Parsed)
decl@(ImportDecl { ideclName :: forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName = XRec (GhcPass 'Parsed) ModuleName
loc_imp_mod_name
                                     , ideclPkgQual :: forall pass. ImportDecl pass -> ImportDeclPkgQual pass
ideclPkgQual = ImportDeclPkgQual (GhcPass 'Parsed)
raw_pkg_qual
                                     , ideclSource :: forall pass. ImportDecl pass -> IsBootInterface
ideclSource = IsBootInterface
want_boot, ideclSafe :: forall pass. ImportDecl pass -> Bool
ideclSafe = Bool
mod_safe
                                     , ideclQualified :: forall pass. ImportDecl pass -> ImportDeclQualifiedStyle
ideclQualified = ImportDeclQualifiedStyle
qual_style
                                     , ideclExt :: forall pass. ImportDecl pass -> XCImportDecl pass
ideclExt = XImportDeclPass { ideclImplicit :: XImportDeclPass -> Bool
ideclImplicit = Bool
implicit }
                                     , ideclAs :: forall pass. ImportDecl pass -> Maybe (XRec pass ModuleName)
ideclAs = Maybe (XRec (GhcPass 'Parsed) ModuleName)
as_mod, ideclImportList :: forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList = Maybe
  (ImportListInterpretation,
   XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)])
imp_details }), SDoc
import_reason)
  = SrcSpanAnnA
-> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
-> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
forall ann a. SrcSpanAnn' ann -> TcRn a -> TcRn a
setSrcSpanA SrcSpanAnnA
loc (RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
 -> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool))
-> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
-> RnM (LImportDecl GhcRn, GlobalRdrEnv, ImportAvails, Bool)
forall a b. (a -> b) -> a -> b
$ do

    case ImportDeclPkgQual (GhcPass 'Parsed)
raw_pkg_qual of
      ImportDeclPkgQual (GhcPass 'Parsed)
RawPkgQual
NoRawPkgQual -> () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure ()
      RawPkgQual StringLiteral
_ -> do
        Bool
pkg_imports <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
xoptM Extension
LangExt.PackageImports
        Bool
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Bool -> Bool
not Bool
pkg_imports) (IOEnv (Env TcGblEnv TcLclEnv) ()
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$ TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addErr TcRnMessage
TcRnPackageImportsDisabled

    let qual_only :: Bool
qual_only = ImportDeclQualifiedStyle -> Bool
isImportDeclQualified ImportDeclQualifiedStyle
qual_style

    -- If there's an error in loadInterface, (e.g. interface
    -- file not found) we get lots of spurious errors from 'filterImports'
    let imp_mod_name :: ModuleName
imp_mod_name = GenLocated SrcSpanAnnA ModuleName -> ModuleName
forall l e. GenLocated l e -> e
unLoc XRec (GhcPass 'Parsed) ModuleName
GenLocated SrcSpanAnnA ModuleName
loc_imp_mod_name
        doc :: SDoc
doc = ModuleName -> SDoc
forall a. Outputable a => a -> SDoc
ppr ModuleName
imp_mod_name SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> SDoc
import_reason

    HscEnv
hsc_env <- TcRnIf TcGblEnv TcLclEnv HscEnv
forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
    UnitEnv
unit_env <- HscEnv -> UnitEnv
hsc_unit_env (HscEnv -> UnitEnv)
-> TcRnIf TcGblEnv TcLclEnv HscEnv
-> IOEnv (Env TcGblEnv TcLclEnv) UnitEnv
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> TcRnIf TcGblEnv TcLclEnv HscEnv
forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
    let pkg_qual :: PkgQual
pkg_qual = UnitEnv -> ModuleName -> RawPkgQual -> PkgQual
renameRawPkgQual UnitEnv
unit_env ModuleName
imp_mod_name ImportDeclPkgQual (GhcPass 'Parsed)
RawPkgQual
raw_pkg_qual

    -- Check for self-import, which confuses the typechecker (#9032)
    -- ghc --make rejects self-import cycles already, but batch-mode may not
    -- at least not until GHC.IfaceToCore.tcHiBootIface, which is too late to avoid
    -- typechecker crashes.  (Indirect self imports are not caught until
    -- GHC.IfaceToCore, see #10337 tracking how to make this error better.)
    --
    -- Originally, we also allowed 'import {-# SOURCE #-} M', but this
    -- caused bug #10182: in one-shot mode, we should never load an hs-boot
    -- file for the module we are compiling into the EPS.  In principle,
    -- it should be possible to support this mode of use, but we would have to
    -- extend Provenance to support a local definition in a qualified location.
    -- For now, we don't support it, but see #10336
    Bool
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (ModuleName
imp_mod_name ModuleName -> ModuleName -> Bool
forall a. Eq a => a -> a -> Bool
== Module -> ModuleName
forall unit. GenModule unit -> ModuleName
moduleName Module
this_mod Bool -> Bool -> Bool
&&
          (case PkgQual
pkg_qual of -- If we have import "<pkg>" M, then we should
                            -- check that "<pkg>" is "this" (which is magic)
                            -- or the name of this_mod's package.  Yurgh!
                            -- c.f. GHC.findModule, and #9997
             PkgQual
NoPkgQual         -> Bool
True
             ThisPkg UnitId
uid       -> UnitId
uid UnitId -> UnitId -> Bool
forall a. Eq a => a -> a -> Bool
== DynFlags -> UnitId
homeUnitId_ (HscEnv -> DynFlags
hsc_dflags HscEnv
hsc_env)
             OtherPkg UnitId
_        -> Bool
False))
         (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addErr (ModuleName -> TcRnMessage
TcRnSelfImport ModuleName
imp_mod_name))

    -- Check for a missing import list (Opt_WarnMissingImportList also
    -- checks for T(..) items but that is done in checkDodgyImport below)
    case Maybe
  (ImportListInterpretation,
   XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)])
imp_details of
        Just (ImportListInterpretation
Exactly, XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)]
_) -> () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return () -- Explicit import list
        Maybe
  (ImportListInterpretation,
   XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)])
_  | Bool
implicit   -> () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return () -- Do not bleat for implicit imports
           | Bool
qual_only  -> () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
           | Bool
otherwise  -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnostic (ModuleName -> TcRnMessage
TcRnNoExplicitImportList ModuleName
imp_mod_name)


    ModIface
iface <- SDoc -> ModuleName -> IsBootInterface -> PkgQual -> RnM ModIface
loadSrcInterface SDoc
doc ModuleName
imp_mod_name IsBootInterface
want_boot PkgQual
pkg_qual

    -- Compiler sanity check: if the import didn't say
    -- {-# SOURCE #-} we should not get a hi-boot file
    Bool
-> String
-> SDoc
-> TcRn
     (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
      ImportAvails, Bool)
-> TcRn
     (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
      ImportAvails, Bool)
forall a. HasCallStack => Bool -> String -> SDoc -> a -> a
warnPprTrace ((IsBootInterface
want_boot IsBootInterface -> IsBootInterface -> Bool
forall a. Eq a => a -> a -> Bool
== IsBootInterface
NotBoot) Bool -> Bool -> Bool
&& (ModIface -> IsBootInterface
mi_boot ModIface
iface IsBootInterface -> IsBootInterface -> Bool
forall a. Eq a => a -> a -> Bool
== IsBootInterface
IsBoot)) String
"rnImportDecl" (ModuleName -> SDoc
forall a. Outputable a => a -> SDoc
ppr ModuleName
imp_mod_name) (TcRn
   (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
    ImportAvails, Bool)
 -> TcRn
      (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
       ImportAvails, Bool))
-> TcRn
     (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
      ImportAvails, Bool)
-> TcRn
     (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
      ImportAvails, Bool)
forall a b. (a -> b) -> a -> b
$ do

    -- Issue a user warning for a redundant {- SOURCE -} import
    -- NB that we arrange to read all the ordinary imports before
    -- any of the {- SOURCE -} imports.
    --
    -- in --make and GHCi, the compilation manager checks for this,
    -- and indeed we shouldn't do it here because the existence of
    -- the non-boot module depends on the compilation order, which
    -- is not deterministic.  The hs-boot test can show this up.
    DynFlags
dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
    Bool -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnIf ((IsBootInterface
want_boot IsBootInterface -> IsBootInterface -> Bool
forall a. Eq a => a -> a -> Bool
== IsBootInterface
IsBoot) Bool -> Bool -> Bool
&& (ModIface -> IsBootInterface
mi_boot ModIface
iface IsBootInterface -> IsBootInterface -> Bool
forall a. Eq a => a -> a -> Bool
== IsBootInterface
NotBoot) Bool -> Bool -> Bool
&& GhcMode -> Bool
isOneShot (DynFlags -> GhcMode
ghcMode DynFlags
dflags))
           (ModuleName -> TcRnMessage
TcRnRedundantSourceImport ModuleName
imp_mod_name)
    Bool
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Bool
mod_safe Bool -> Bool -> Bool
&& Bool -> Bool
not (DynFlags -> Bool
safeImportsOn DynFlags
dflags)) (IOEnv (Env TcGblEnv TcLclEnv) ()
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$
        TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addErr (ModuleName -> TcRnMessage
TcRnSafeImportsDisabled ModuleName
imp_mod_name)

    let imp_mod :: Module
imp_mod = ModIface -> Module
forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_module ModIface
iface
        qual_mod_name :: ModuleName
qual_mod_name = (GenLocated SrcSpanAnnA ModuleName -> ModuleName)
-> Maybe (GenLocated SrcSpanAnnA ModuleName) -> Maybe ModuleName
forall a b. (a -> b) -> Maybe a -> Maybe b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap GenLocated SrcSpanAnnA ModuleName -> ModuleName
forall l e. GenLocated l e -> e
unLoc Maybe (XRec (GhcPass 'Parsed) ModuleName)
Maybe (GenLocated SrcSpanAnnA ModuleName)
as_mod Maybe ModuleName -> ModuleName -> ModuleName
forall a. Maybe a -> a -> a
`orElse` ModuleName
imp_mod_name
        imp_spec :: ImpDeclSpec
imp_spec  = ImpDeclSpec { is_mod :: Module
is_mod = Module
imp_mod, is_qual :: Bool
is_qual = Bool
qual_only,
                                  is_dloc :: SrcSpan
is_dloc = SrcSpanAnnA -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc, is_as :: ModuleName
is_as = ModuleName
qual_mod_name }

    -- filter the imports according to the import declaration
    (Maybe
  (ImportListInterpretation,
   LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)])
new_imp_details, [GlobalRdrElt]
gres) <- HasDebugCallStack =>
HscEnv
-> ModIface
-> ImpDeclSpec
-> Maybe
     (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
-> RnM
     (Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]),
      [GlobalRdrElt])
HscEnv
-> ModIface
-> ImpDeclSpec
-> Maybe
     (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
-> RnM
     (Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]),
      [GlobalRdrElt])
filterImports HscEnv
hsc_env ModIface
iface ImpDeclSpec
imp_spec Maybe
  (ImportListInterpretation,
   XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)])
Maybe (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
imp_details

    -- for certain error messages, we’d like to know what could be imported
    -- here, if everything were imported
    GlobalRdrEnv
potential_gres <- [GlobalRdrElt] -> GlobalRdrEnv
mkGlobalRdrEnv ([GlobalRdrElt] -> GlobalRdrEnv)
-> ((Maybe
       (ImportListInterpretation,
        LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
     [GlobalRdrElt])
    -> [GlobalRdrElt])
-> (Maybe
      (ImportListInterpretation,
       LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
    [GlobalRdrElt])
-> GlobalRdrEnv
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Maybe
   (ImportListInterpretation,
    LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
 [GlobalRdrElt])
-> [GlobalRdrElt]
forall a b. (a, b) -> b
snd ((Maybe
    (ImportListInterpretation,
     LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
  [GlobalRdrElt])
 -> GlobalRdrEnv)
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (Maybe
        (ImportListInterpretation,
         LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
      [GlobalRdrElt])
-> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> HasDebugCallStack =>
HscEnv
-> ModIface
-> ImpDeclSpec
-> Maybe
     (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
-> RnM
     (Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]),
      [GlobalRdrElt])
HscEnv
-> ModIface
-> ImpDeclSpec
-> Maybe
     (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
-> RnM
     (Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]),
      [GlobalRdrElt])
filterImports HscEnv
hsc_env ModIface
iface ImpDeclSpec
imp_spec Maybe (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
Maybe
  (ImportListInterpretation,
   LocatedL [GenLocated SrcSpanAnnA (IE (GhcPass 'Parsed))])
forall a. Maybe a
Nothing

    let gbl_env :: GlobalRdrEnv
gbl_env = [GlobalRdrElt] -> GlobalRdrEnv
mkGlobalRdrEnv [GlobalRdrElt]
gres

        is_hiding :: Bool
is_hiding | Just (ImportListInterpretation
EverythingBut,XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)]
_) <- Maybe
  (ImportListInterpretation,
   XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)])
imp_details = Bool
True
                  | Bool
otherwise                             = Bool
False

        -- should the import be safe?
        mod_safe' :: Bool
mod_safe' = Bool
mod_safe
                    Bool -> Bool -> Bool
|| (Bool -> Bool
not Bool
implicit Bool -> Bool -> Bool
&& DynFlags -> Bool
safeDirectImpsReq DynFlags
dflags)
                    Bool -> Bool -> Bool
|| (Bool
implicit Bool -> Bool -> Bool
&& DynFlags -> Bool
safeImplicitImpsReq DynFlags
dflags)

    HscEnv
hsc_env <- TcRnIf TcGblEnv TcLclEnv HscEnv
forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
    let home_unit :: HomeUnit
home_unit = HscEnv -> HomeUnit
hsc_home_unit HscEnv
hsc_env
        other_home_units :: Set UnitId
other_home_units = HscEnv -> Set UnitId
hsc_all_home_unit_ids HscEnv
hsc_env
        imv :: ImportedModsVal
imv = ImportedModsVal
            { imv_name :: ModuleName
imv_name        = ModuleName
qual_mod_name
            , imv_span :: SrcSpan
imv_span        = SrcSpanAnnA -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc
            , imv_is_safe :: Bool
imv_is_safe     = Bool
mod_safe'
            , imv_is_hiding :: Bool
imv_is_hiding   = Bool
is_hiding
            , imv_all_exports :: GlobalRdrEnv
imv_all_exports = GlobalRdrEnv
potential_gres
            , imv_qualified :: Bool
imv_qualified   = Bool
qual_only
            }
        imports :: ImportAvails
imports = HomeUnit
-> Set UnitId
-> ModIface
-> Bool
-> IsBootInterface
-> ImportedBy
-> ImportAvails
calculateAvails HomeUnit
home_unit Set UnitId
other_home_units ModIface
iface Bool
mod_safe' IsBootInterface
want_boot (ImportedModsVal -> ImportedBy
ImportedByUser ImportedModsVal
imv)

    -- Complain if we import a deprecated module
    case IfaceWarnings -> Warnings GhcRn
fromIfaceWarnings (ModIface -> IfaceWarnings
forall (phase :: ModIfacePhase). ModIface_ phase -> IfaceWarnings
mi_warns ModIface
iface) of
       WarnAll WarningTxt GhcRn
txt -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnostic (ModuleName -> WarningTxt GhcRn -> TcRnMessage
TcRnDeprecatedModule ModuleName
imp_mod_name WarningTxt GhcRn
txt)
       Warnings GhcRn
_           -> () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()

    -- Complain about -Wcompat-unqualified-imports violations.
    ImportDecl (GhcPass 'Parsed)
-> ModIface -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnUnqualifiedImport ImportDecl (GhcPass 'Parsed)
decl ModIface
iface

    let new_imp_decl :: ImportDecl GhcRn
new_imp_decl = ImportDecl
          { ideclExt :: XCImportDecl GhcRn
ideclExt       = ImportDecl (GhcPass 'Parsed) -> XCImportDecl (GhcPass 'Parsed)
forall pass. ImportDecl pass -> XCImportDecl pass
ideclExt ImportDecl (GhcPass 'Parsed)
decl
          , ideclName :: XRec GhcRn ModuleName
ideclName      = ImportDecl (GhcPass 'Parsed) -> XRec (GhcPass 'Parsed) ModuleName
forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName ImportDecl (GhcPass 'Parsed)
decl
          , ideclPkgQual :: ImportDeclPkgQual GhcRn
ideclPkgQual   = ImportDeclPkgQual GhcRn
PkgQual
pkg_qual
          , ideclSource :: IsBootInterface
ideclSource    = ImportDecl (GhcPass 'Parsed) -> IsBootInterface
forall pass. ImportDecl pass -> IsBootInterface
ideclSource ImportDecl (GhcPass 'Parsed)
decl
          , ideclSafe :: Bool
ideclSafe      = Bool
mod_safe'
          , ideclQualified :: ImportDeclQualifiedStyle
ideclQualified = ImportDecl (GhcPass 'Parsed) -> ImportDeclQualifiedStyle
forall pass. ImportDecl pass -> ImportDeclQualifiedStyle
ideclQualified ImportDecl (GhcPass 'Parsed)
decl
          , ideclAs :: Maybe (XRec GhcRn ModuleName)
ideclAs        = ImportDecl (GhcPass 'Parsed)
-> Maybe (XRec (GhcPass 'Parsed) ModuleName)
forall pass. ImportDecl pass -> Maybe (XRec pass ModuleName)
ideclAs ImportDecl (GhcPass 'Parsed)
decl
          , ideclImportList :: Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
ideclImportList = Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
Maybe
  (ImportListInterpretation,
   LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)])
new_imp_details
          }

    (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
 ImportAvails, Bool)
-> TcRn
     (GenLocated SrcSpanAnnA (ImportDecl GhcRn), GlobalRdrEnv,
      ImportAvails, Bool)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (SrcSpanAnnA
-> ImportDecl GhcRn -> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc ImportDecl GhcRn
new_imp_decl, GlobalRdrEnv
gbl_env, ImportAvails
imports, ModIface -> Bool
forall (phase :: ModIfacePhase). ModIface_ phase -> Bool
mi_hpc ModIface
iface)


-- | Rename raw package imports
renameRawPkgQual :: UnitEnv -> ModuleName -> RawPkgQual -> PkgQual
renameRawPkgQual :: UnitEnv -> ModuleName -> RawPkgQual -> PkgQual
renameRawPkgQual UnitEnv
unit_env ModuleName
mn = \case
  RawPkgQual
NoRawPkgQual -> PkgQual
NoPkgQual
  RawPkgQual StringLiteral
p -> UnitEnv -> ModuleName -> Maybe FastString -> PkgQual
renamePkgQual UnitEnv
unit_env ModuleName
mn (FastString -> Maybe FastString
forall a. a -> Maybe a
Just (StringLiteral -> FastString
sl_fs StringLiteral
p))

-- | Rename raw package imports
renamePkgQual :: UnitEnv -> ModuleName -> Maybe FastString -> PkgQual
renamePkgQual :: UnitEnv -> ModuleName -> Maybe FastString -> PkgQual
renamePkgQual UnitEnv
unit_env ModuleName
mn Maybe FastString
mb_pkg = case Maybe FastString
mb_pkg of
  Maybe FastString
Nothing -> PkgQual
NoPkgQual
  Just FastString
pkg_fs
    | Just UnitId
uid <- HomeUnit -> UnitId
forall u. GenHomeUnit u -> UnitId
homeUnitId (HomeUnit -> UnitId) -> Maybe HomeUnit -> Maybe UnitId
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> UnitEnv -> Maybe HomeUnit
ue_homeUnit UnitEnv
unit_env
    , FastString
pkg_fs FastString -> FastString -> Bool
forall a. Eq a => a -> a -> Bool
== String -> FastString
fsLit String
"this"
    -> UnitId -> PkgQual
ThisPkg UnitId
uid

    | Just (UnitId
uid, Maybe FastString
_) <- ((UnitId, Maybe FastString) -> Bool)
-> [(UnitId, Maybe FastString)] -> Maybe (UnitId, Maybe FastString)
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Maybe a
find (Bool -> Maybe Bool -> Bool
forall a. a -> Maybe a -> a
fromMaybe Bool
False (Maybe Bool -> Bool)
-> ((UnitId, Maybe FastString) -> Maybe Bool)
-> (UnitId, Maybe FastString)
-> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (FastString -> Bool) -> Maybe FastString -> Maybe Bool
forall a b. (a -> b) -> Maybe a -> Maybe b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (FastString -> FastString -> Bool
forall a. Eq a => a -> a -> Bool
== FastString
pkg_fs) (Maybe FastString -> Maybe Bool)
-> ((UnitId, Maybe FastString) -> Maybe FastString)
-> (UnitId, Maybe FastString)
-> Maybe Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (UnitId, Maybe FastString) -> Maybe FastString
forall a b. (a, b) -> b
snd) [(UnitId, Maybe FastString)]
home_names
    -> UnitId -> PkgQual
ThisPkg UnitId
uid

    | Just UnitId
uid <- UnitState -> ModuleName -> PackageName -> Maybe UnitId
resolvePackageImport (HasDebugCallStack => UnitEnv -> UnitState
UnitEnv -> UnitState
ue_units UnitEnv
unit_env) ModuleName
mn (FastString -> PackageName
PackageName FastString
pkg_fs)
    -> UnitId -> PkgQual
OtherPkg UnitId
uid

    | Bool
otherwise
    -> UnitId -> PkgQual
OtherPkg (FastString -> UnitId
UnitId FastString
pkg_fs)
       -- not really correct as pkg_fs is unlikely to be a valid unit-id but
       -- we will report the failure later...
  where
    home_names :: [(UnitId, Maybe FastString)]
home_names  = (UnitId -> (UnitId, Maybe FastString))
-> [UnitId] -> [(UnitId, Maybe FastString)]
forall a b. (a -> b) -> [a] -> [b]
map (\UnitId
uid -> (UnitId
uid, String -> FastString
mkFastString (String -> FastString) -> Maybe String -> Maybe FastString
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> DynFlags -> Maybe String
thisPackageName (HomeUnitEnv -> DynFlags
homeUnitEnv_dflags (HasDebugCallStack => UnitId -> UnitEnv -> HomeUnitEnv
UnitId -> UnitEnv -> HomeUnitEnv
ue_findHomeUnitEnv UnitId
uid UnitEnv
unit_env)))) [UnitId]
hpt_deps

    units :: UnitState
units = HasDebugCallStack => UnitEnv -> UnitState
UnitEnv -> UnitState
ue_units UnitEnv
unit_env

    hpt_deps :: [UnitId]
    hpt_deps :: [UnitId]
hpt_deps  = UnitState -> [UnitId]
homeUnitDepends UnitState
units


-- | Calculate the 'ImportAvails' induced by an import of a particular
-- interface, but without 'imp_mods'.
calculateAvails :: HomeUnit
                -> S.Set UnitId
                -> ModIface
                -> IsSafeImport
                -> IsBootInterface
                -> ImportedBy
                -> ImportAvails
calculateAvails :: HomeUnit
-> Set UnitId
-> ModIface
-> Bool
-> IsBootInterface
-> ImportedBy
-> ImportAvails
calculateAvails HomeUnit
home_unit Set UnitId
other_home_units ModIface
iface Bool
mod_safe' IsBootInterface
want_boot ImportedBy
imported_by =
  let imp_mod :: Module
imp_mod    = ModIface -> Module
forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_module ModIface
iface
      imp_sem_mod :: Module
imp_sem_mod= ModIface -> Module
forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_semantic_module ModIface
iface
      orph_iface :: Bool
orph_iface = ModIfaceBackend -> Bool
mi_orphan (ModIface -> IfaceBackendExts 'ModIfaceFinal
forall (phase :: ModIfacePhase).
ModIface_ phase -> IfaceBackendExts phase
mi_final_exts ModIface
iface)
      has_finsts :: Bool
has_finsts = ModIfaceBackend -> Bool
mi_finsts (ModIface -> IfaceBackendExts 'ModIfaceFinal
forall (phase :: ModIfacePhase).
ModIface_ phase -> IfaceBackendExts phase
mi_final_exts ModIface
iface)
      deps :: Dependencies
deps       = ModIface -> Dependencies
forall (phase :: ModIfacePhase). ModIface_ phase -> Dependencies
mi_deps ModIface
iface
      trust :: SafeHaskellMode
trust      = IfaceTrustInfo -> SafeHaskellMode
getSafeMode (IfaceTrustInfo -> SafeHaskellMode)
-> IfaceTrustInfo -> SafeHaskellMode
forall a b. (a -> b) -> a -> b
$ ModIface -> IfaceTrustInfo
forall (phase :: ModIfacePhase). ModIface_ phase -> IfaceTrustInfo
mi_trust ModIface
iface
      trust_pkg :: Bool
trust_pkg  = ModIface -> Bool
forall (phase :: ModIfacePhase). ModIface_ phase -> Bool
mi_trust_pkg ModIface
iface
      is_sig :: Bool
is_sig     = ModIface -> HscSource
forall (phase :: ModIfacePhase). ModIface_ phase -> HscSource
mi_hsc_src ModIface
iface HscSource -> HscSource -> Bool
forall a. Eq a => a -> a -> Bool
== HscSource
HsigFile

      -- If the module exports anything defined in this module, just
      -- ignore it.  Reason: otherwise it looks as if there are two
      -- local definition sites for the thing, and an error gets
      -- reported.  Easiest thing is just to filter them out up
      -- front. This situation only arises if a module imports
      -- itself, or another module that imported it.  (Necessarily,
      -- this involves a loop.)
      --
      -- We do this *after* filterImports, so that if you say
      --      module A where
      --         import B( AType )
      --         type AType = ...
      --
      --      module B( AType ) where
      --         import {-# SOURCE #-} A( AType )
      --
      -- then you won't get a 'B does not export AType' message.


      -- Compute new transitive dependencies
      --
      -- 'dep_orphs' and 'dep_finsts' do NOT include the imported module
      -- itself, but we DO need to include this module in 'imp_orphs' and
      -- 'imp_finsts' if it defines an orphan or instance family; thus the
      -- orph_iface/has_iface tests.

      deporphs :: [Module]
deporphs  = Dependencies -> [Module]
dep_orphs Dependencies
deps
      depfinsts :: [Module]
depfinsts = Dependencies -> [Module]
dep_finsts Dependencies
deps

      orphans :: [Module]
orphans | Bool
orph_iface = Bool -> SDoc -> [Module] -> [Module]
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (Bool -> Bool
not (Module
imp_sem_mod Module -> [Module] -> Bool
forall a. Eq a => a -> [a] -> Bool
forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [Module]
deporphs)) (Module -> SDoc
forall a. Outputable a => a -> SDoc
ppr Module
imp_sem_mod SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [Module] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [Module]
deporphs) ([Module] -> [Module]) -> [Module] -> [Module]
forall a b. (a -> b) -> a -> b
$
                             Module
imp_sem_mod Module -> [Module] -> [Module]
forall a. a -> [a] -> [a]
: [Module]
deporphs
              | Bool
otherwise  = [Module]
deporphs

      finsts :: [Module]
finsts | Bool
has_finsts = Bool -> SDoc -> [Module] -> [Module]
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (Bool -> Bool
not (Module
imp_sem_mod Module -> [Module] -> Bool
forall a. Eq a => a -> [a] -> Bool
forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [Module]
depfinsts)) (Module -> SDoc
forall a. Outputable a => a -> SDoc
ppr Module
imp_sem_mod SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [Module] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [Module]
depfinsts) ([Module] -> [Module]) -> [Module] -> [Module]
forall a b. (a -> b) -> a -> b
$
                            Module
imp_sem_mod Module -> [Module] -> [Module]
forall a. a -> [a] -> [a]
: [Module]
depfinsts
             | Bool
otherwise  = [Module]
depfinsts

      -- Trusted packages are a lot like orphans.
      trusted_pkgs :: Set UnitId
trusted_pkgs | Bool
mod_safe' = Dependencies -> Set UnitId
dep_trusted_pkgs Dependencies
deps
                   | Bool
otherwise = Set UnitId
forall a. Set a
S.empty


      pkg :: GenUnit UnitId
pkg = Module -> GenUnit UnitId
forall unit. GenModule unit -> unit
moduleUnit (ModIface -> Module
forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_module ModIface
iface)
      ipkg :: UnitId
ipkg = GenUnit UnitId -> UnitId
toUnitId GenUnit UnitId
pkg

      -- Does this import mean we now require our own pkg
      -- to be trusted? See Note [Trust Own Package]
      ptrust :: Bool
ptrust = SafeHaskellMode
trust SafeHaskellMode -> SafeHaskellMode -> Bool
forall a. Eq a => a -> a -> Bool
== SafeHaskellMode
Sf_Trustworthy Bool -> Bool -> Bool
|| Bool
trust_pkg
      pkg_trust_req :: Bool
pkg_trust_req
        | HomeUnit -> GenUnit UnitId -> Bool
isHomeUnit HomeUnit
home_unit GenUnit UnitId
pkg = Bool
ptrust
        | Bool
otherwise = Bool
False

      dependent_pkgs :: Set UnitId
dependent_pkgs = if GenUnit UnitId -> UnitId
toUnitId GenUnit UnitId
pkg UnitId -> Set UnitId -> Bool
forall a. Ord a => a -> Set a -> Bool
`S.member` Set UnitId
other_home_units
                        then Set UnitId
forall a. Set a
S.empty
                        else UnitId -> Set UnitId
forall a. a -> Set a
S.singleton UnitId
ipkg

      direct_mods :: InstalledModuleEnv (GenWithIsBoot ModuleName)
direct_mods = Set (UnitId, GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
mkModDeps (Set (UnitId, GenWithIsBoot ModuleName)
 -> InstalledModuleEnv (GenWithIsBoot ModuleName))
-> Set (UnitId, GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
forall a b. (a -> b) -> a -> b
$ if GenUnit UnitId -> UnitId
toUnitId GenUnit UnitId
pkg UnitId -> Set UnitId -> Bool
forall a. Ord a => a -> Set a -> Bool
`S.member` Set UnitId
other_home_units
                      then (UnitId, GenWithIsBoot ModuleName)
-> Set (UnitId, GenWithIsBoot ModuleName)
forall a. a -> Set a
S.singleton (Module -> UnitId
moduleUnitId Module
imp_mod, (ModuleName -> IsBootInterface -> GenWithIsBoot ModuleName
forall mod. mod -> IsBootInterface -> GenWithIsBoot mod
GWIB (Module -> ModuleName
forall unit. GenModule unit -> ModuleName
moduleName Module
imp_mod) IsBootInterface
want_boot))
                      else Set (UnitId, GenWithIsBoot ModuleName)
forall a. Set a
S.empty

      dep_boot_mods_map :: InstalledModuleEnv (GenWithIsBoot ModuleName)
dep_boot_mods_map = Set (UnitId, GenWithIsBoot ModuleName)
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
mkModDeps (Dependencies -> Set (UnitId, GenWithIsBoot ModuleName)
dep_boot_mods Dependencies
deps)

      boot_mods :: InstalledModuleEnv (GenWithIsBoot ModuleName)
boot_mods
        -- If we are looking for a boot module, it must be HPT
        | IsBootInterface
IsBoot <- IsBootInterface
want_boot = InstalledModuleEnv (GenWithIsBoot ModuleName)
-> InstalledModule
-> GenWithIsBoot ModuleName
-> InstalledModuleEnv (GenWithIsBoot ModuleName)
forall a.
InstalledModuleEnv a
-> InstalledModule -> a -> InstalledModuleEnv a
extendInstalledModuleEnv InstalledModuleEnv (GenWithIsBoot ModuleName)
dep_boot_mods_map (GenUnit UnitId -> UnitId
toUnitId (GenUnit UnitId -> UnitId) -> Module -> InstalledModule
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Module
imp_mod) (ModuleName -> IsBootInterface -> GenWithIsBoot ModuleName
forall mod. mod -> IsBootInterface -> GenWithIsBoot mod
GWIB (Module -> ModuleName
forall unit. GenModule unit -> ModuleName
moduleName Module
imp_mod) IsBootInterface
IsBoot)
        -- Now we are importing A properly, so don't go looking for
        -- A.hs-boot
        | HomeUnit -> GenUnit UnitId -> Bool
isHomeUnit HomeUnit
home_unit GenUnit UnitId
pkg = InstalledModuleEnv (GenWithIsBoot ModuleName)
dep_boot_mods_map
        -- There's no boot files to find in external imports
        | Bool
otherwise = InstalledModuleEnv (GenWithIsBoot ModuleName)
forall a. InstalledModuleEnv a
emptyInstalledModuleEnv

      sig_mods :: [ModuleName]
sig_mods =
        if Bool
is_sig
          then Module -> ModuleName
forall unit. GenModule unit -> ModuleName
moduleName Module
imp_mod ModuleName -> [ModuleName] -> [ModuleName]
forall a. a -> [a] -> [a]
: Dependencies -> [ModuleName]
dep_sig_mods Dependencies
deps
          else Dependencies -> [ModuleName]
dep_sig_mods Dependencies
deps


  in ImportAvails {
          imp_mods :: ImportedMods
imp_mods       = Module -> [ImportedBy] -> ImportedMods
forall a. Module -> a -> ModuleEnv a
unitModuleEnv (ModIface -> Module
forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_module ModIface
iface) [ImportedBy
imported_by],
          imp_orphs :: [Module]
imp_orphs      = [Module]
orphans,
          imp_finsts :: [Module]
imp_finsts     = [Module]
finsts,
          imp_sig_mods :: [ModuleName]
imp_sig_mods   = [ModuleName]
sig_mods,
          imp_direct_dep_mods :: InstalledModuleEnv (GenWithIsBoot ModuleName)
imp_direct_dep_mods = InstalledModuleEnv (GenWithIsBoot ModuleName)
direct_mods,
          imp_dep_direct_pkgs :: Set UnitId
imp_dep_direct_pkgs = Set UnitId
dependent_pkgs,
          imp_boot_mods :: InstalledModuleEnv (GenWithIsBoot ModuleName)
imp_boot_mods = InstalledModuleEnv (GenWithIsBoot ModuleName)
boot_mods,

          -- Add in the imported modules trusted package
          -- requirements. ONLY do this though if we import the
          -- module as a safe import.
          -- See Note [Tracking Trust Transitively]
          -- and Note [Trust Transitive Property]
          imp_trust_pkgs :: Set UnitId
imp_trust_pkgs = Set UnitId
trusted_pkgs,
          -- Do we require our own pkg to be trusted?
          -- See Note [Trust Own Package]
          imp_trust_own_pkg :: Bool
imp_trust_own_pkg = Bool
pkg_trust_req
     }


-- | Issue a warning if the user imports Data.List without either an import
-- list or `qualified`. This is part of the migration plan for the
-- `Data.List.singleton` proposal. See #17244.
warnUnqualifiedImport :: ImportDecl GhcPs -> ModIface -> RnM ()
warnUnqualifiedImport :: ImportDecl (GhcPass 'Parsed)
-> ModIface -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnUnqualifiedImport ImportDecl (GhcPass 'Parsed)
decl ModIface
iface =
    Bool
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
bad_import (IOEnv (Env TcGblEnv TcLclEnv) ()
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$ do
      SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnosticAt SrcSpan
loc (ImportDecl (GhcPass 'Parsed) -> TcRnMessage
TcRnCompatUnqualifiedImport ImportDecl (GhcPass 'Parsed)
decl)
  where
    mod :: Module
mod = ModIface -> Module
forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_module ModIface
iface
    loc :: SrcSpan
loc = GenLocated SrcSpanAnnA ModuleName -> SrcSpan
forall a e. GenLocated (SrcSpanAnn' a) e -> SrcSpan
getLocA (GenLocated SrcSpanAnnA ModuleName -> SrcSpan)
-> GenLocated SrcSpanAnnA ModuleName -> SrcSpan
forall a b. (a -> b) -> a -> b
$ ImportDecl (GhcPass 'Parsed) -> XRec (GhcPass 'Parsed) ModuleName
forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName ImportDecl (GhcPass 'Parsed)
decl

    is_qual :: Bool
is_qual = ImportDeclQualifiedStyle -> Bool
isImportDeclQualified (ImportDecl (GhcPass 'Parsed) -> ImportDeclQualifiedStyle
forall pass. ImportDecl pass -> ImportDeclQualifiedStyle
ideclQualified ImportDecl (GhcPass 'Parsed)
decl)
    has_import_list :: Bool
has_import_list =
      -- We treat a `hiding` clause as not having an import list although
      -- it's not entirely clear this is the right choice.
      case ImportDecl (GhcPass 'Parsed)
-> Maybe
     (ImportListInterpretation,
      XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)])
forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList ImportDecl (GhcPass 'Parsed)
decl of
        Just (ImportListInterpretation
Exactly, XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)]
_) -> Bool
True
        Maybe
  (ImportListInterpretation,
   XRec (GhcPass 'Parsed) [LIE (GhcPass 'Parsed)])
_               -> Bool
False
    bad_import :: Bool
bad_import =
         Bool -> Bool
not Bool
is_qual
      Bool -> Bool -> Bool
&& Bool -> Bool
not Bool
has_import_list
      Bool -> Bool -> Bool
&& Module
mod Module -> ModuleSet -> Bool
`elemModuleSet` ModuleSet
qualifiedMods

    -- Modules for which we warn if we see unqualified imports
    qualifiedMods :: ModuleSet
qualifiedMods = [Module] -> ModuleSet
mkModuleSet [ Module
dATA_LIST ]

{-
************************************************************************
*                                                                      *
\subsection{importsFromLocalDecls}
*                                                                      *
************************************************************************

From the top-level declarations of this module produce
        * the lexical environment
        * the ImportAvails
created by its bindings.

Note [Top-level Names in Template Haskell decl quotes]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
See also: Note [Interactively-bound Ids in GHCi] in GHC.Driver.Env
          Note [Looking up Exact RdrNames] in GHC.Rename.Env

Consider a Template Haskell declaration quotation like this:
      module M where
        f x = h [d| f = 3 |]
When renaming the declarations inside [d| ...|], we treat the
top level binders specially in two ways

1.  We give them an Internal Name, not (as usual) an External one.
    This is done by GHC.Rename.Env.newTopSrcBinder.

2.  We make them *shadow* the outer bindings.
    See Note [GlobalRdrEnv shadowing]

3. We find out whether we are inside a [d| ... |] by testing the TH
   stage. This is a slight hack, because the stage field was really
   meant for the type checker, and here we are not interested in the
   fields of Brack, hence the error thunks in thRnBrack.
-}

extendGlobalRdrEnvRn :: [GlobalRdrElt]
                     -> MiniFixityEnv
                     -> RnM (TcGblEnv, TcLclEnv)
-- Updates both the GlobalRdrEnv and the FixityEnv
-- We return a new TcLclEnv only because we might have to
-- delete some bindings from it;
-- see Note [Top-level Names in Template Haskell decl quotes]

extendGlobalRdrEnvRn :: [GlobalRdrElt] -> MiniFixityEnv -> RnM (TcGblEnv, TcLclEnv)
extendGlobalRdrEnvRn [GlobalRdrElt]
new_gres MiniFixityEnv
new_fixities
  = RnM (TcGblEnv, TcLclEnv) -> RnM (TcGblEnv, TcLclEnv)
forall r. TcM r -> TcM r
checkNoErrs (RnM (TcGblEnv, TcLclEnv) -> RnM (TcGblEnv, TcLclEnv))
-> RnM (TcGblEnv, TcLclEnv) -> RnM (TcGblEnv, TcLclEnv)
forall a b. (a -> b) -> a -> b
$  -- See Note [Fail fast on duplicate definitions]
    do  { (TcGblEnv
gbl_env, TcLclEnv
lcl_env) <- RnM (TcGblEnv, TcLclEnv)
forall gbl lcl. TcRnIf gbl lcl (gbl, lcl)
getEnvs
        ; ThStage
stage <- TcM ThStage
getStage
        ; Bool
isGHCi <- TcRnIf TcGblEnv TcLclEnv Bool
getIsGHCi
        ; let rdr_env :: GlobalRdrEnv
rdr_env  = TcGblEnv -> GlobalRdrEnv
tcg_rdr_env TcGblEnv
gbl_env
              fix_env :: FixityEnv
fix_env  = TcGblEnv -> FixityEnv
tcg_fix_env TcGblEnv
gbl_env
              th_bndrs :: ThBindEnv
th_bndrs = TcLclEnv -> ThBindEnv
getLclEnvThBndrs TcLclEnv
lcl_env
              th_lvl :: Int
th_lvl   = ThStage -> Int
thLevel ThStage
stage

              -- Delete new_occs from global and local envs
              -- If we are in a TemplateHaskell decl bracket,
              --    we are going to shadow them
              -- See Note [GlobalRdrEnv shadowing]
              inBracket :: Bool
inBracket = ThStage -> Bool
isBrackStage ThStage
stage

              lcl_env_TH :: TcLclEnv
lcl_env_TH = (TcLclCtxt -> TcLclCtxt) -> TcLclEnv -> TcLclEnv
modifyLclCtxt (\TcLclCtxt
lcl_env -> TcLclCtxt
lcl_env { tcl_rdr = minusLocalRdrEnv (tcl_rdr lcl_env) new_gres_env }) TcLclEnv
lcl_env
                           -- See Note [GlobalRdrEnv shadowing]

              lcl_env2 :: TcLclEnv
lcl_env2 | Bool
inBracket = TcLclEnv
lcl_env_TH
                       | Bool
otherwise = TcLclEnv
lcl_env

              -- Deal with shadowing: see Note [GlobalRdrEnv shadowing]
              want_shadowing :: Bool
want_shadowing = Bool
isGHCi Bool -> Bool -> Bool
|| Bool
inBracket
              rdr_env1 :: GlobalRdrEnv
rdr_env1 | Bool
want_shadowing = Bool -> GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
shadowNames Bool
False GlobalRdrEnv
rdr_env GlobalRdrEnv
new_gres_env
                       | Bool
otherwise      = GlobalRdrEnv
rdr_env

              lcl_env3 :: TcLclEnv
lcl_env3 = (TcLclCtxt -> TcLclCtxt) -> TcLclEnv -> TcLclEnv
modifyLclCtxt (\TcLclCtxt
lcl_env -> TcLclCtxt
lcl_env { tcl_th_bndrs = extendNameEnvList th_bndrs
                                                       [ ( n, (TopLevel, th_lvl) )
                                                       | n <- new_names ] }) TcLclEnv
lcl_env2

        ; GlobalRdrEnv
rdr_env2 <- (GlobalRdrEnv
 -> GlobalRdrElt -> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv)
-> GlobalRdrEnv
-> [GlobalRdrElt]
-> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM GlobalRdrEnv
-> GlobalRdrElt -> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv
add_gre GlobalRdrEnv
rdr_env1 [GlobalRdrElt]
new_gres

        ; let fix_env' :: FixityEnv
fix_env' = (FixityEnv -> GlobalRdrElt -> FixityEnv)
-> FixityEnv -> [GlobalRdrElt] -> FixityEnv
forall b a. (b -> a -> b) -> b -> [a] -> b
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl' FixityEnv -> GlobalRdrElt -> FixityEnv
extend_fix_env FixityEnv
fix_env [GlobalRdrElt]
new_gres
              gbl_env' :: TcGblEnv
gbl_env' = TcGblEnv
gbl_env { tcg_rdr_env = rdr_env2, tcg_fix_env = fix_env' }

        ; String -> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
traceRn String
"extendGlobalRdrEnvRn 2" (Bool -> GlobalRdrEnv -> SDoc
pprGlobalRdrEnv Bool
True GlobalRdrEnv
rdr_env2)
        ; (TcGblEnv, TcLclEnv) -> RnM (TcGblEnv, TcLclEnv)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
gbl_env', TcLclEnv
lcl_env3) }
  where
    new_names :: [Name]
new_names    = (GlobalRdrElt -> Name) -> [GlobalRdrElt] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName [GlobalRdrElt]
new_gres
    new_gres_env :: GlobalRdrEnv
new_gres_env = [GlobalRdrElt] -> GlobalRdrEnv
mkGlobalRdrEnv [GlobalRdrElt]
new_gres

    -- If there is a fixity decl for the gre, add it to the fixity env
    extend_fix_env :: FixityEnv -> GlobalRdrElt -> FixityEnv
extend_fix_env FixityEnv
fix_env GlobalRdrElt
gre
      | Just (L SrcSpan
_ Fixity
fi) <- MiniFixityEnv -> FastString -> Maybe (Located Fixity)
forall a. FastStringEnv a -> FastString -> Maybe a
lookupFsEnv MiniFixityEnv
new_fixities (OccName -> FastString
occNameFS OccName
occ)
      = FixityEnv -> Name -> FixItem -> FixityEnv
forall a. NameEnv a -> Name -> a -> NameEnv a
extendNameEnv FixityEnv
fix_env Name
name (OccName -> Fixity -> FixItem
FixItem OccName
occ Fixity
fi)
      | Bool
otherwise
      = FixityEnv
fix_env
      where
        name :: Name
name = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre
        occ :: OccName
occ  = GlobalRdrElt -> OccName
forall info. GlobalRdrEltX info -> OccName
greOccName GlobalRdrElt
gre

    add_gre :: GlobalRdrEnv -> GlobalRdrElt -> RnM GlobalRdrEnv
    -- Extend the GlobalRdrEnv with a LocalDef GRE
    -- If there is already a LocalDef GRE with the same OccName,
    --    report an error and discard the new GRE
    -- This establishes INVARIANT 1 of GlobalRdrEnvs
    add_gre :: GlobalRdrEnv
-> GlobalRdrElt -> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv
add_gre GlobalRdrEnv
env GlobalRdrElt
gre
      | Bool -> Bool
not ([GlobalRdrElt] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GlobalRdrElt]
dups)    -- Same OccName defined twice
      = do { NonEmpty GlobalRdrElt -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDupDeclErr (GlobalRdrElt
gre GlobalRdrElt -> [GlobalRdrElt] -> NonEmpty GlobalRdrElt
forall a. a -> [a] -> NonEmpty a
:| [GlobalRdrElt]
dups); GlobalRdrEnv -> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return GlobalRdrEnv
env }

      | Bool
otherwise
      = GlobalRdrEnv -> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (GlobalRdrEnv -> GlobalRdrElt -> GlobalRdrEnv
extendGlobalRdrEnv GlobalRdrEnv
env GlobalRdrElt
gre)
      where
        -- See Note [Reporting duplicate local declarations]
        dups :: [GlobalRdrElt]
dups = (GlobalRdrElt -> Bool) -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. (a -> Bool) -> [a] -> [a]
filter GlobalRdrElt -> Bool
isBadDupGRE
             ([GlobalRdrElt] -> [GlobalRdrElt])
-> [GlobalRdrElt] -> [GlobalRdrElt]
forall a b. (a -> b) -> a -> b
$ GlobalRdrEnv -> LookupGRE GREInfo -> [GlobalRdrElt]
forall info.
GlobalRdrEnvX info -> LookupGRE info -> [GlobalRdrEltX info]
lookupGRE GlobalRdrEnv
env (OccName -> WhichGREs GREInfo -> LookupGRE GREInfo
forall info. OccName -> WhichGREs info -> LookupGRE info
LookupOccName (GlobalRdrElt -> OccName
forall info. GlobalRdrEltX info -> OccName
greOccName GlobalRdrElt
gre) (FieldsOrSelectors -> WhichGREs GREInfo
RelevantGREsFOS FieldsOrSelectors
WantBoth))
        isBadDupGRE :: GlobalRdrElt -> Bool
isBadDupGRE GlobalRdrElt
old_gre = GlobalRdrElt -> Bool
forall info. GlobalRdrEltX info -> Bool
isLocalGRE GlobalRdrElt
old_gre Bool -> Bool -> Bool
&& GlobalRdrElt -> GlobalRdrElt -> Bool
greClashesWith GlobalRdrElt
gre GlobalRdrElt
old_gre

{- Note [Fail fast on duplicate definitions]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If there are duplicate bindings for the same thing, we want to fail
fast. Having two bindings for the same thing can cause follow-on errors.
Example (test T9975a):
   data Test = Test { x :: Int }
   pattern Test wat = Test { x = wat }
This defines 'Test' twice.  The second defn has no field-names; and then
we get an error from Test { x=wat }, saying "Test has no field 'x'".

Easiest thing is to bale out fast on duplicate definitions, which
we do via `checkNoErrs` on `extendGlobalRdrEnvRn`.

Note [Reporting duplicate local declarations]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In general, a single module may not define the same OccName multiple times. This
is checked in extendGlobalRdrEnvRn: when adding a new locally-defined GRE to the
GlobalRdrEnv we report an error if there are already duplicates in the
environment.  This establishes INVARIANT 1 (see comments on GlobalRdrEnv in
GHC.Types.Name.Reader), which says that for a given OccName, all the
GlobalRdrElts to which it maps must have distinct 'greName's.

For example, the following will be rejected:

  f x = x
  g x = x
  f x = x  -- Duplicate!

Users are allowed to introduce new GREs with the same OccName as an imported GRE,
as disambiguation is possible through the module system, e.g.:

  module M where
    import N (f)
    f x = x
    g x = M.f x + N.f x

If both GREs are local, the general rule is that two GREs clash if they have
the same OccName, i.e. they share a textual name and live in the same namespace.
However, there are additional clashes due to record fields:

  - a new variable clashes with previously defined record fields
    which define field selectors,

  - a new record field shadows:

    - previously defined variables, if it defines a field selector,
    - previously defined record fields, unless it is a duplicate record field.

This logic is implemented in the function 'GHC.Types.Name.Reader.greClashesWith'.

See also Note [Skipping ambiguity errors at use sites of local declarations] in
GHC.Rename.Utils.
-}


{- *********************************************************************
*                                                                      *
    getLocalDeclBindersd@ returns the names for an HsDecl
             It's used for source code.

        *** See Note [The Naming story] in GHC.Hs.Decls ****
*                                                                      *
********************************************************************* -}

getLocalNonValBinders :: MiniFixityEnv -> HsGroup GhcPs
    -> RnM ((TcGblEnv, TcLclEnv), NameSet)
-- Get all the top-level binders bound the group *except*
-- for value bindings, which are treated separately
-- Specifically we return AvailInfo for
--      * type decls (incl constructors and record selectors)
--      * class decls (including class ops)
--      * associated types
--      * foreign imports
--      * value signatures (in hs-boot files only)

getLocalNonValBinders :: MiniFixityEnv
-> HsGroup (GhcPass 'Parsed) -> RnM ((TcGblEnv, TcLclEnv), Defs)
getLocalNonValBinders MiniFixityEnv
fixity_env
     (HsGroup { hs_valds :: forall p. HsGroup p -> HsValBinds p
hs_valds  = HsValBinds (GhcPass 'Parsed)
binds,
                hs_tyclds :: forall p. HsGroup p -> [TyClGroup p]
hs_tyclds = [TyClGroup (GhcPass 'Parsed)]
tycl_decls,
                hs_fords :: forall p. HsGroup p -> [LForeignDecl p]
hs_fords  = [LForeignDecl (GhcPass 'Parsed)]
foreign_decls })
  = do  { -- Process all type/class decls *except* family instances
        ; let inst_decls :: [GenLocated SrcSpanAnnA (InstDecl (GhcPass 'Parsed))]
inst_decls = [TyClGroup (GhcPass 'Parsed)]
tycl_decls [TyClGroup (GhcPass 'Parsed)]
-> (TyClGroup (GhcPass 'Parsed)
    -> [GenLocated SrcSpanAnnA (InstDecl (GhcPass 'Parsed))])
-> [GenLocated SrcSpanAnnA (InstDecl (GhcPass 'Parsed))]
forall a b. [a] -> (a -> [b]) -> [b]
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= TyClGroup (GhcPass 'Parsed) -> [LInstDecl (GhcPass 'Parsed)]
TyClGroup (GhcPass 'Parsed)
-> [GenLocated SrcSpanAnnA (InstDecl (GhcPass 'Parsed))]
forall pass. TyClGroup pass -> [LInstDecl pass]
group_instds
        ; DuplicateRecordFields
dup_fields_ok <- DynFlags -> DuplicateRecordFields
xopt_DuplicateRecordFields (DynFlags -> DuplicateRecordFields)
-> IOEnv (Env TcGblEnv TcLclEnv) DynFlags
-> IOEnv (Env TcGblEnv TcLclEnv) DuplicateRecordFields
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
        ; FieldSelectors
has_sel <- DynFlags -> FieldSelectors
xopt_FieldSelectors (DynFlags -> FieldSelectors)
-> IOEnv (Env TcGblEnv TcLclEnv) DynFlags
-> IOEnv (Env TcGblEnv TcLclEnv) FieldSelectors
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
        ; [GlobalRdrElt]
tc_gres
            <- (GenLocated SrcSpanAnnA (TyClDecl (GhcPass 'Parsed))
 -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt])
-> [GenLocated SrcSpanAnnA (TyClDecl (GhcPass 'Parsed))]
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall (m :: * -> *) (f :: * -> *) a b.
(Monad m, Traversable f) =>
(a -> m [b]) -> f a -> m [b]
concatMapM
                 (DuplicateRecordFields
-> FieldSelectors
-> LTyClDecl (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
new_tc DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel)
                 ([TyClGroup (GhcPass 'Parsed)] -> [LTyClDecl (GhcPass 'Parsed)]
forall pass. [TyClGroup pass] -> [LTyClDecl pass]
tyClGroupTyClDecls [TyClGroup (GhcPass 'Parsed)]
tycl_decls)
        ; String -> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
traceRn String
"getLocalNonValBinders 1" ([GlobalRdrElt] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [GlobalRdrElt]
tc_gres)
        ; (TcGblEnv, TcLclEnv)
envs <- [GlobalRdrElt] -> MiniFixityEnv -> RnM (TcGblEnv, TcLclEnv)
extendGlobalRdrEnvRn [GlobalRdrElt]
tc_gres MiniFixityEnv
fixity_env
        ; (TcGblEnv, TcLclEnv)
-> RnM ((TcGblEnv, TcLclEnv), Defs)
-> RnM ((TcGblEnv, TcLclEnv), Defs)
forall a. (TcGblEnv, TcLclEnv) -> TcRn a -> TcRn a
restoreEnvs (TcGblEnv, TcLclEnv)
envs (RnM ((TcGblEnv, TcLclEnv), Defs)
 -> RnM ((TcGblEnv, TcLclEnv), Defs))
-> RnM ((TcGblEnv, TcLclEnv), Defs)
-> RnM ((TcGblEnv, TcLclEnv), Defs)
forall a b. (a -> b) -> a -> b
$ do {
            -- Bring these things into scope first
            -- See Note [Looking up family names in family instances]

          -- Process all family instances
          -- to bring new data constructors into scope
        ; [[GlobalRdrElt]]
nti_gress <- (GenLocated SrcSpanAnnA (InstDecl (GhcPass 'Parsed))
 -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt])
-> [GenLocated SrcSpanAnnA (InstDecl (GhcPass 'Parsed))]
-> IOEnv (Env TcGblEnv TcLclEnv) [[GlobalRdrElt]]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (DuplicateRecordFields
-> FieldSelectors
-> LInstDecl (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
new_assoc DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel) [GenLocated SrcSpanAnnA (InstDecl (GhcPass 'Parsed))]
inst_decls

          -- Finish off with value binders:
          --    foreign decls and pattern synonyms for an ordinary module
          --    type sigs in case of a hs-boot file only
        ; Bool
is_boot <- TcRnIf TcGblEnv TcLclEnv Bool
tcIsHsBootOrSig
        ; let val_bndrs :: [GenLocated SrcSpanAnnN RdrName]
val_bndrs
                | Bool
is_boot = case HsValBinds (GhcPass 'Parsed)
binds of
                      ValBinds XValBinds (GhcPass 'Parsed) (GhcPass 'Parsed)
_ LHsBindsLR (GhcPass 'Parsed) (GhcPass 'Parsed)
_val_binds [LSig (GhcPass 'Parsed)]
val_sigs ->
                          -- In a hs-boot file, the value binders come from the
                          --  *signatures*, and there should be no foreign binders
                          [ SrcSpanAnnN -> RdrName -> GenLocated SrcSpanAnnN RdrName
forall l e. l -> e -> GenLocated l e
L (SrcSpanAnnA -> SrcSpanAnnN
forall a ann. SrcSpanAnn' a -> SrcAnn ann
l2l SrcSpanAnnA
decl_loc) (GenLocated SrcSpanAnnN RdrName -> RdrName
forall l e. GenLocated l e -> e
unLoc GenLocated SrcSpanAnnN RdrName
n)
                          | L SrcSpanAnnA
decl_loc (TypeSig XTypeSig (GhcPass 'Parsed)
_ [LIdP (GhcPass 'Parsed)]
ns LHsSigWcType (GhcPass 'Parsed)
_) <- [LSig (GhcPass 'Parsed)]
[GenLocated SrcSpanAnnA (Sig (GhcPass 'Parsed))]
val_sigs, GenLocated SrcSpanAnnN RdrName
n <- [LIdP (GhcPass 'Parsed)]
[GenLocated SrcSpanAnnN RdrName]
ns]
                      HsValBinds (GhcPass 'Parsed)
_ -> String -> [GenLocated SrcSpanAnnN RdrName]
forall a. HasCallStack => String -> a
panic String
"Non-ValBinds in hs-boot group"
                | Bool
otherwise = [GenLocated SrcSpanAnnN RdrName]
for_hs_bndrs
        ; [GlobalRdrElt]
val_gres <- (GenLocated SrcSpanAnnN RdrName
 -> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrElt)
-> [GenLocated SrcSpanAnnN RdrName]
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM GenLocated SrcSpanAnnN RdrName
-> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrElt
new_simple [GenLocated SrcSpanAnnN RdrName]
val_bndrs

        ; let avails :: [GlobalRdrElt]
avails    = [[GlobalRdrElt]] -> [GlobalRdrElt]
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [[GlobalRdrElt]]
nti_gress [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. [a] -> [a] -> [a]
++ [GlobalRdrElt]
val_gres
              new_bndrs :: Defs
new_bndrs = [GlobalRdrElt] -> Defs
forall info. [GlobalRdrEltX info] -> Defs
gresToNameSet [GlobalRdrElt]
avails Defs -> Defs -> Defs
`unionNameSet`
                          [GlobalRdrElt] -> Defs
forall info. [GlobalRdrEltX info] -> Defs
gresToNameSet [GlobalRdrElt]
tc_gres
        ; String -> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
traceRn String
"getLocalNonValBinders 2" ([GlobalRdrElt] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [GlobalRdrElt]
avails)
        ; (TcGblEnv, TcLclEnv)
envs <- [GlobalRdrElt] -> MiniFixityEnv -> RnM (TcGblEnv, TcLclEnv)
extendGlobalRdrEnvRn [GlobalRdrElt]
avails MiniFixityEnv
fixity_env
        ; ((TcGblEnv, TcLclEnv), Defs) -> RnM ((TcGblEnv, TcLclEnv), Defs)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ((TcGblEnv, TcLclEnv)
envs, Defs
new_bndrs) } }
  where
    for_hs_bndrs :: [LocatedN RdrName]
    for_hs_bndrs :: [GenLocated SrcSpanAnnN RdrName]
for_hs_bndrs = [LForeignDecl (GhcPass 'Parsed)] -> [LIdP (GhcPass 'Parsed)]
forall (p :: Pass) a.
(UnXRec (GhcPass p), IsSrcSpanAnn p a) =>
[LForeignDecl (GhcPass p)] -> [LIdP (GhcPass p)]
hsForeignDeclsBinders [LForeignDecl (GhcPass 'Parsed)]
foreign_decls

      -- the SrcSpan attached to the input should be the span of the
      -- declaration, not just the name
    new_simple :: LocatedN RdrName -> RnM GlobalRdrElt
    new_simple :: GenLocated SrcSpanAnnN RdrName
-> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrElt
new_simple GenLocated SrcSpanAnnN RdrName
rdr_name = do { Name
nm <- GenLocated SrcSpanAnnN RdrName -> RnM Name
newTopSrcBinder GenLocated SrcSpanAnnN RdrName
rdr_name
                             ; GlobalRdrElt -> IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrElt
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (Parent -> Name -> GlobalRdrElt
mkLocalVanillaGRE Parent
NoParent Name
nm) }

    new_tc :: DuplicateRecordFields -> FieldSelectors -> LTyClDecl GhcPs
           -> RnM [GlobalRdrElt]
    new_tc :: DuplicateRecordFields
-> FieldSelectors
-> LTyClDecl (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
new_tc DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel LTyClDecl (GhcPass 'Parsed)
tc_decl -- NOT for type/data instances
        = do { let TyDeclBinders (LocatedA (IdP (GhcPass 'Parsed))
main_bndr, TyConFlavour ()
tc_flav) [(LocatedA (IdP (GhcPass 'Parsed)), TyConFlavour ())]
at_bndrs [LocatedA (IdP (GhcPass 'Parsed))]
sig_bndrs
                     (LConsWithFields [(LocatedA (IdP (GhcPass 'Parsed)), Maybe [Located Int])]
cons_with_flds IntMap (LFieldOcc (GhcPass 'Parsed))
flds) = GenLocated SrcSpanAnnA (TyClDecl (GhcPass 'Parsed))
-> TyDeclBinders 'Parsed
forall (p :: Pass).
(IsPass p, OutputableBndrId p) =>
LocatedA (TyClDecl (GhcPass p)) -> TyDeclBinders p
hsLTyClDeclBinders LTyClDecl (GhcPass 'Parsed)
GenLocated SrcSpanAnnA (TyClDecl (GhcPass 'Parsed))
tc_decl
             ; Name
tycon_name          <- GenLocated SrcSpanAnnN RdrName -> RnM Name
newTopSrcBinder (GenLocated SrcSpanAnnN RdrName -> RnM Name)
-> GenLocated SrcSpanAnnN RdrName -> RnM Name
forall a b. (a -> b) -> a -> b
$ LocatedAn AnnListItem RdrName -> GenLocated SrcSpanAnnN RdrName
forall a1 a2. LocatedAn a1 a2 -> LocatedN a2
l2n LocatedA (IdP (GhcPass 'Parsed))
LocatedAn AnnListItem RdrName
main_bndr
             ; [Name]
at_names            <- ((LocatedAn AnnListItem RdrName, TyConFlavour ()) -> RnM Name)
-> [(LocatedAn AnnListItem RdrName, TyConFlavour ())]
-> IOEnv (Env TcGblEnv TcLclEnv) [Name]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (GenLocated SrcSpanAnnN RdrName -> RnM Name
newTopSrcBinder (GenLocated SrcSpanAnnN RdrName -> RnM Name)
-> ((LocatedAn AnnListItem RdrName, TyConFlavour ())
    -> GenLocated SrcSpanAnnN RdrName)
-> (LocatedAn AnnListItem RdrName, TyConFlavour ())
-> RnM Name
forall b c a. (b -> c) -> (a -> b) -> a -> c
. LocatedAn AnnListItem RdrName -> GenLocated SrcSpanAnnN RdrName
forall a1 a2. LocatedAn a1 a2 -> LocatedN a2
l2n (LocatedAn AnnListItem RdrName -> GenLocated SrcSpanAnnN RdrName)
-> ((LocatedAn AnnListItem RdrName, TyConFlavour ())
    -> LocatedAn AnnListItem RdrName)
-> (LocatedAn AnnListItem RdrName, TyConFlavour ())
-> GenLocated SrcSpanAnnN RdrName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (LocatedAn AnnListItem RdrName, TyConFlavour ())
-> LocatedAn AnnListItem RdrName
forall a b. (a, b) -> a
fst) [(LocatedA (IdP (GhcPass 'Parsed)), TyConFlavour ())]
[(LocatedAn AnnListItem RdrName, TyConFlavour ())]
at_bndrs
             ; [Name]
sig_names           <- (LocatedAn AnnListItem RdrName -> RnM Name)
-> [LocatedAn AnnListItem RdrName]
-> IOEnv (Env TcGblEnv TcLclEnv) [Name]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (GenLocated SrcSpanAnnN RdrName -> RnM Name
newTopSrcBinder (GenLocated SrcSpanAnnN RdrName -> RnM Name)
-> (LocatedAn AnnListItem RdrName
    -> GenLocated SrcSpanAnnN RdrName)
-> LocatedAn AnnListItem RdrName
-> RnM Name
forall b c a. (b -> c) -> (a -> b) -> a -> c
. LocatedAn AnnListItem RdrName -> GenLocated SrcSpanAnnN RdrName
forall a1 a2. LocatedAn a1 a2 -> LocatedN a2
l2n) [LocatedA (IdP (GhcPass 'Parsed))]
[LocatedAn AnnListItem RdrName]
sig_bndrs
             ; [(Name, Maybe [Located Int])]
con_names_with_flds <- ((LocatedAn AnnListItem RdrName, Maybe [Located Int])
 -> IOEnv (Env TcGblEnv TcLclEnv) (Name, Maybe [Located Int]))
-> [(LocatedAn AnnListItem RdrName, Maybe [Located Int])]
-> IOEnv (Env TcGblEnv TcLclEnv) [(Name, Maybe [Located Int])]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (\(LocatedAn AnnListItem RdrName
con,Maybe [Located Int]
flds) -> (,Maybe [Located Int]
flds) (Name -> (Name, Maybe [Located Int]))
-> RnM Name
-> IOEnv (Env TcGblEnv TcLclEnv) (Name, Maybe [Located Int])
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> GenLocated SrcSpanAnnN RdrName -> RnM Name
newTopSrcBinder (LocatedAn AnnListItem RdrName -> GenLocated SrcSpanAnnN RdrName
forall a1 a2. LocatedAn a1 a2 -> LocatedN a2
l2n LocatedAn AnnListItem RdrName
con)) [(LocatedA (IdP (GhcPass 'Parsed)), Maybe [Located Int])]
[(LocatedAn AnnListItem RdrName, Maybe [Located Int])]
cons_with_flds
             ; IntMap FieldLabel
flds' <- (GenLocated (SrcAnn NoEpAnns) (FieldOcc (GhcPass 'Parsed))
 -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel)
-> IntMap
     (GenLocated (SrcAnn NoEpAnns) (FieldOcc (GhcPass 'Parsed)))
-> IOEnv (Env TcGblEnv TcLclEnv) (IntMap FieldLabel)
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b.
Monad m =>
(a -> m b) -> IntMap a -> m (IntMap b)
mapM (DuplicateRecordFields
-> FieldSelectors
-> [Name]
-> LFieldOcc (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
newRecordFieldLabel DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel ([Name]
 -> LFieldOcc (GhcPass 'Parsed)
 -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel)
-> [Name]
-> LFieldOcc (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
forall a b. (a -> b) -> a -> b
$ ((Name, Maybe [Located Int]) -> Name)
-> [(Name, Maybe [Located Int])] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map (Name, Maybe [Located Int]) -> Name
forall a b. (a, b) -> a
fst [(Name, Maybe [Located Int])]
con_names_with_flds) IntMap (LFieldOcc (GhcPass 'Parsed))
IntMap (GenLocated (SrcAnn NoEpAnns) (FieldOcc (GhcPass 'Parsed)))
flds
             ; ((Name, Maybe [Located Int]) -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [(Name, Maybe [Located Int])]
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (IntMap FieldLabel
-> (Name, Maybe [Located Int]) -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_dup_fld_errs IntMap FieldLabel
flds') [(Name, Maybe [Located Int])]
con_names_with_flds
             ; let tc_gre :: GlobalRdrElt
tc_gre = TyConFlavour Name -> Name -> GlobalRdrElt
mkLocalTyConGRE ((() -> Name) -> TyConFlavour () -> TyConFlavour Name
forall a b. (a -> b) -> TyConFlavour a -> TyConFlavour b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Name -> () -> Name
forall a b. a -> b -> a
const Name
tycon_name) TyConFlavour ()
tc_flav) Name
tycon_name
                   fld_env :: [(ConLikeName, ConInfo)]
fld_env = [(Name, Maybe [Located Int])]
-> IntMap FieldLabel -> [(ConLikeName, ConInfo)]
mk_fld_env [(Name, Maybe [Located Int])]
con_names_with_flds IntMap FieldLabel
flds'
                   at_gres :: [GlobalRdrElt]
at_gres = ((LocatedAn AnnListItem RdrName, TyConFlavour ())
 -> Name -> GlobalRdrElt)
-> [(LocatedAn AnnListItem RdrName, TyConFlavour ())]
-> [Name]
-> [GlobalRdrElt]
forall a b c. (a -> b -> c) -> [a] -> [b] -> [c]
zipWith (\ (LocatedAn AnnListItem RdrName
_, TyConFlavour ()
at_flav) Name
at_nm -> TyConFlavour Name -> Name -> GlobalRdrElt
mkLocalTyConGRE ((() -> Name) -> TyConFlavour () -> TyConFlavour Name
forall a b. (a -> b) -> TyConFlavour a -> TyConFlavour b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Name -> () -> Name
forall a b. a -> b -> a
const Name
tycon_name) TyConFlavour ()
at_flav) Name
at_nm)
                               [(LocatedA (IdP (GhcPass 'Parsed)), TyConFlavour ())]
[(LocatedAn AnnListItem RdrName, TyConFlavour ())]
at_bndrs [Name]
at_names
                   sig_gres :: [GlobalRdrElt]
sig_gres = (Name -> GlobalRdrElt) -> [Name] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map (Parent -> Name -> GlobalRdrElt
mkLocalVanillaGRE (Name -> Parent
ParentIs Name
tycon_name)) [Name]
sig_names
                   con_gres :: [GlobalRdrElt]
con_gres = ((ConLikeName, ConInfo) -> GlobalRdrElt)
-> [(ConLikeName, ConInfo)] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map (Parent -> (ConLikeName, ConInfo) -> GlobalRdrElt
mkLocalConLikeGRE (Name -> Parent
ParentIs Name
tycon_name)) [(ConLikeName, ConInfo)]
fld_env
                   fld_gres :: [GlobalRdrElt]
fld_gres = Parent -> [(ConLikeName, ConInfo)] -> [GlobalRdrElt]
mkLocalFieldGREs (Name -> Parent
ParentIs Name
tycon_name) [(ConLikeName, ConInfo)]
fld_env
                   sub_gres :: [GlobalRdrElt]
sub_gres = [GlobalRdrElt]
at_gres [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. [a] -> [a] -> [a]
++ [GlobalRdrElt]
sig_gres [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. [a] -> [a] -> [a]
++ [GlobalRdrElt]
con_gres [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. [a] -> [a] -> [a]
++ [GlobalRdrElt]
fld_gres
             ; String -> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
traceRn String
"getLocalNonValBinders new_tc" (SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$
                 [SDoc] -> SDoc
forall doc. IsDoc doc => [doc] -> doc
vcat [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"tycon:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> Name -> SDoc
forall a. Outputable a => a -> SDoc
ppr Name
tycon_name
                      , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"tc_gre:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> GlobalRdrElt -> SDoc
forall a. Outputable a => a -> SDoc
ppr GlobalRdrElt
tc_gre
                      , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"sub_gres:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [GlobalRdrElt] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [GlobalRdrElt]
sub_gres ]
             ; [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ([GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt])
-> [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall a b. (a -> b) -> a -> b
$ GlobalRdrElt
tc_gre GlobalRdrElt -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. a -> [a] -> [a]
: [GlobalRdrElt]
sub_gres }

    -- Calculate the record field information, which feeds into the GlobalRdrElts
    -- for DataCons and their fields. It's convenient to do this here where
    -- we are working with a single datatype definition.
    --
    -- The information we needed was all set up for us:
    -- see Note [Collecting record fields in data declarations] in GHC.Hs.Utils.
    mk_fld_env :: [(Name, Maybe [Located Int])] -> IntMap FieldLabel
               -> [(ConLikeName, ConInfo)]
    mk_fld_env :: [(Name, Maybe [Located Int])]
-> IntMap FieldLabel -> [(ConLikeName, ConInfo)]
mk_fld_env [(Name, Maybe [Located Int])]
names IntMap FieldLabel
flds =
      [ (Name -> ConLikeName
DataConName Name
con, ConInfo
con_info)
      | (Name
con, Maybe [Located Int]
mb_fl_indxs) <- [(Name, Maybe [Located Int])]
names
      , let con_info :: ConInfo
con_info = case ([Located Int] -> [FieldLabel])
-> Maybe [Located Int] -> Maybe [FieldLabel]
forall a b. (a -> b) -> Maybe a -> Maybe b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap ((Located Int -> FieldLabel) -> [Located Int] -> [FieldLabel]
forall a b. (a -> b) -> [a] -> [b]
map ((IntMap FieldLabel
flds IntMap FieldLabel -> Int -> FieldLabel
forall a. IntMap a -> Int -> a
IntMap.!) (Int -> FieldLabel)
-> (Located Int -> Int) -> Located Int -> FieldLabel
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Located Int -> Int
forall l e. GenLocated l e -> e
unLoc)) Maybe [Located Int]
mb_fl_indxs of
              Maybe [FieldLabel]
Nothing         -> ConInfo
ConHasPositionalArgs
              Just []         -> ConInfo
ConIsNullary
              Just (FieldLabel
fld:[FieldLabel]
flds) -> NonEmpty FieldLabel -> ConInfo
ConHasRecordFields (NonEmpty FieldLabel -> ConInfo) -> NonEmpty FieldLabel -> ConInfo
forall a b. (a -> b) -> a -> b
$ FieldLabel
fld FieldLabel -> [FieldLabel] -> NonEmpty FieldLabel
forall a. a -> [a] -> NonEmpty a
NE.:| [FieldLabel]
flds ]

    new_assoc :: DuplicateRecordFields -> FieldSelectors -> LInstDecl GhcPs
              -> RnM [GlobalRdrElt]
    new_assoc :: DuplicateRecordFields
-> FieldSelectors
-> LInstDecl (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
new_assoc DuplicateRecordFields
_ FieldSelectors
_ (L SrcSpanAnnA
_ (TyFamInstD {})) = [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return []
      -- type instances don't bind new names

    new_assoc DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel (L SrcSpanAnnA
_ (DataFamInstD XDataFamInstD (GhcPass 'Parsed)
_ DataFamInstDecl (GhcPass 'Parsed)
d))
      = DuplicateRecordFields
-> FieldSelectors
-> Maybe Name
-> DataFamInstDecl (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
new_di DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel Maybe Name
forall a. Maybe a
Nothing DataFamInstDecl (GhcPass 'Parsed)
d
    new_assoc DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel
      (L SrcSpanAnnA
_ (ClsInstD XClsInstD (GhcPass 'Parsed)
_ (ClsInstDecl { cid_poly_ty :: forall pass. ClsInstDecl pass -> LHsSigType pass
cid_poly_ty = LHsSigType (GhcPass 'Parsed)
inst_ty
                                    , cid_datafam_insts :: forall pass. ClsInstDecl pass -> [LDataFamInstDecl pass]
cid_datafam_insts = [LDataFamInstDecl (GhcPass 'Parsed)]
adts })))
      = do -- First, attempt to grab the name of the class from the instance.
           -- This step could fail if the instance is not headed by a class,
           -- such as in the following examples:
           --
           -- (1) The class is headed by a bang pattern, such as in
           --     `instance !Show Int` (#3811c)
           -- (2) The class is headed by a type variable, such as in
           --     `instance c` (#16385)
           --
           -- If looking up the class name fails, then mb_cls_gre will
           -- be Nothing.
           Maybe GlobalRdrElt
mb_cls_gre <- MaybeT (IOEnv (Env TcGblEnv TcLclEnv)) GlobalRdrElt
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
forall (m :: * -> *) a. MaybeT m a -> m (Maybe a)
runMaybeT (MaybeT (IOEnv (Env TcGblEnv TcLclEnv)) GlobalRdrElt
 -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt))
-> MaybeT (IOEnv (Env TcGblEnv TcLclEnv)) GlobalRdrElt
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
forall a b. (a -> b) -> a -> b
$ do
             -- See (1) above
             L SrcSpanAnnN
loc RdrName
cls_rdr <- IOEnv
  (Env TcGblEnv TcLclEnv) (Maybe (GenLocated SrcSpanAnnN RdrName))
-> MaybeT
     (IOEnv (Env TcGblEnv TcLclEnv)) (GenLocated SrcSpanAnnN RdrName)
forall (m :: * -> *) a. m (Maybe a) -> MaybeT m a
MaybeT (IOEnv
   (Env TcGblEnv TcLclEnv) (Maybe (GenLocated SrcSpanAnnN RdrName))
 -> MaybeT
      (IOEnv (Env TcGblEnv TcLclEnv)) (GenLocated SrcSpanAnnN RdrName))
-> IOEnv
     (Env TcGblEnv TcLclEnv) (Maybe (GenLocated SrcSpanAnnN RdrName))
-> MaybeT
     (IOEnv (Env TcGblEnv TcLclEnv)) (GenLocated SrcSpanAnnN RdrName)
forall a b. (a -> b) -> a -> b
$ Maybe (GenLocated SrcSpanAnnN RdrName)
-> IOEnv
     (Env TcGblEnv TcLclEnv) (Maybe (GenLocated SrcSpanAnnN RdrName))
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Maybe (GenLocated SrcSpanAnnN RdrName)
 -> IOEnv
      (Env TcGblEnv TcLclEnv) (Maybe (GenLocated SrcSpanAnnN RdrName)))
-> Maybe (GenLocated SrcSpanAnnN RdrName)
-> IOEnv
     (Env TcGblEnv TcLclEnv) (Maybe (GenLocated SrcSpanAnnN RdrName))
forall a b. (a -> b) -> a -> b
$ LHsSigType (GhcPass 'Parsed)
-> Maybe (LocatedN (IdP (GhcPass 'Parsed)))
forall (p :: Pass).
(Anno (IdGhcP p) ~ SrcSpanAnnN) =>
LHsSigType (GhcPass p) -> Maybe (LocatedN (IdP (GhcPass p)))
getLHsInstDeclClass_maybe LHsSigType (GhcPass 'Parsed)
inst_ty
             -- See (2) above
             IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
-> MaybeT (IOEnv (Env TcGblEnv TcLclEnv)) GlobalRdrElt
forall (m :: * -> *) a. m (Maybe a) -> MaybeT m a
MaybeT (IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
 -> MaybeT (IOEnv (Env TcGblEnv TcLclEnv)) GlobalRdrElt)
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
-> MaybeT (IOEnv (Env TcGblEnv TcLclEnv)) GlobalRdrElt
forall a b. (a -> b) -> a -> b
$ SrcSpan
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
forall a. SrcSpan -> TcRn a -> TcRn a
setSrcSpan (SrcSpanAnnN -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnN
loc) (IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
 -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt))
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
forall a b. (a -> b) -> a -> b
$ WhichGREs GREInfo
-> RdrName -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe GlobalRdrElt)
lookupGlobalOccRn_maybe WhichGREs GREInfo
forall info. WhichGREs info
SameNameSpace RdrName
cls_rdr
           -- Assuming the previous step succeeded, process any associated data
           -- family instances. If the previous step failed, bail out.
           case Maybe GlobalRdrElt
mb_cls_gre of
             Maybe GlobalRdrElt
Nothing
               -> [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure []
             Just GlobalRdrElt
cls_gre
               -> let cls_nm :: Name
cls_nm = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
cls_gre
                  in (GenLocated SrcSpanAnnA (DataFamInstDecl (GhcPass 'Parsed))
 -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt])
-> [GenLocated SrcSpanAnnA (DataFamInstDecl (GhcPass 'Parsed))]
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall (m :: * -> *) (f :: * -> *) a b.
(Monad m, Traversable f) =>
(a -> m [b]) -> f a -> m [b]
concatMapM (DuplicateRecordFields
-> FieldSelectors
-> Maybe Name
-> DataFamInstDecl (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
new_di DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel (Name -> Maybe Name
forall a. a -> Maybe a
Just Name
cls_nm) (DataFamInstDecl (GhcPass 'Parsed)
 -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt])
-> (GenLocated SrcSpanAnnA (DataFamInstDecl (GhcPass 'Parsed))
    -> DataFamInstDecl (GhcPass 'Parsed))
-> GenLocated SrcSpanAnnA (DataFamInstDecl (GhcPass 'Parsed))
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GenLocated SrcSpanAnnA (DataFamInstDecl (GhcPass 'Parsed))
-> DataFamInstDecl (GhcPass 'Parsed)
forall l e. GenLocated l e -> e
unLoc) [LDataFamInstDecl (GhcPass 'Parsed)]
[GenLocated SrcSpanAnnA (DataFamInstDecl (GhcPass 'Parsed))]
adts

    new_di :: DuplicateRecordFields -> FieldSelectors
           -> Maybe Name -- class name
           -> DataFamInstDecl GhcPs
           -> RnM [GlobalRdrElt]
    new_di :: DuplicateRecordFields
-> FieldSelectors
-> Maybe Name
-> DataFamInstDecl (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
new_di DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel Maybe Name
mb_cls dfid :: DataFamInstDecl (GhcPass 'Parsed)
dfid@(DataFamInstDecl { dfid_eqn :: forall pass. DataFamInstDecl pass -> FamEqn pass (HsDataDefn pass)
dfid_eqn = FamEqn (GhcPass 'Parsed) (HsDataDefn (GhcPass 'Parsed))
ti_decl })
        = do { Name
main_name <- GenLocated SrcSpanAnnN Name -> Name
forall l e. GenLocated l e -> e
unLoc (GenLocated SrcSpanAnnN Name -> Name)
-> IOEnv (Env TcGblEnv TcLclEnv) (GenLocated SrcSpanAnnN Name)
-> RnM Name
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Maybe Name
-> GenLocated SrcSpanAnnN RdrName
-> IOEnv (Env TcGblEnv TcLclEnv) (GenLocated SrcSpanAnnN Name)
lookupFamInstName Maybe Name
mb_cls (FamEqn (GhcPass 'Parsed) (HsDataDefn (GhcPass 'Parsed))
-> LIdP (GhcPass 'Parsed)
forall pass rhs. FamEqn pass rhs -> LIdP pass
feqn_tycon FamEqn (GhcPass 'Parsed) (HsDataDefn (GhcPass 'Parsed))
ti_decl)
             ; let LConsWithFields [(LocatedA (IdP (GhcPass 'Parsed)), Maybe [Located Int])]
cons_with_flds IntMap (LFieldOcc (GhcPass 'Parsed))
flds = DataFamInstDecl (GhcPass 'Parsed) -> LConsWithFields 'Parsed
forall (p :: Pass).
(IsPass p, OutputableBndrId p) =>
DataFamInstDecl (GhcPass p) -> LConsWithFields p
hsDataFamInstBinders DataFamInstDecl (GhcPass 'Parsed)
dfid
             ; [(Name, Maybe [Located Int])]
sub_names <- ((LocatedAn AnnListItem RdrName, Maybe [Located Int])
 -> IOEnv (Env TcGblEnv TcLclEnv) (Name, Maybe [Located Int]))
-> [(LocatedAn AnnListItem RdrName, Maybe [Located Int])]
-> IOEnv (Env TcGblEnv TcLclEnv) [(Name, Maybe [Located Int])]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (\(LocatedAn AnnListItem RdrName
con,Maybe [Located Int]
flds) -> (,Maybe [Located Int]
flds) (Name -> (Name, Maybe [Located Int]))
-> RnM Name
-> IOEnv (Env TcGblEnv TcLclEnv) (Name, Maybe [Located Int])
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> GenLocated SrcSpanAnnN RdrName -> RnM Name
newTopSrcBinder (LocatedAn AnnListItem RdrName -> GenLocated SrcSpanAnnN RdrName
forall a1 a2. LocatedAn a1 a2 -> LocatedN a2
l2n LocatedAn AnnListItem RdrName
con)) [(LocatedA (IdP (GhcPass 'Parsed)), Maybe [Located Int])]
[(LocatedAn AnnListItem RdrName, Maybe [Located Int])]
cons_with_flds
             ; IntMap FieldLabel
flds' <- (GenLocated (SrcAnn NoEpAnns) (FieldOcc (GhcPass 'Parsed))
 -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel)
-> IntMap
     (GenLocated (SrcAnn NoEpAnns) (FieldOcc (GhcPass 'Parsed)))
-> IOEnv (Env TcGblEnv TcLclEnv) (IntMap FieldLabel)
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b.
Monad m =>
(a -> m b) -> IntMap a -> m (IntMap b)
mapM (DuplicateRecordFields
-> FieldSelectors
-> [Name]
-> LFieldOcc (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
newRecordFieldLabel DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel ([Name]
 -> LFieldOcc (GhcPass 'Parsed)
 -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel)
-> [Name]
-> LFieldOcc (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
forall a b. (a -> b) -> a -> b
$ ((Name, Maybe [Located Int]) -> Name)
-> [(Name, Maybe [Located Int])] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map (Name, Maybe [Located Int]) -> Name
forall a b. (a, b) -> a
fst [(Name, Maybe [Located Int])]
sub_names) IntMap (LFieldOcc (GhcPass 'Parsed))
IntMap (GenLocated (SrcAnn NoEpAnns) (FieldOcc (GhcPass 'Parsed)))
flds
             ; ((Name, Maybe [Located Int]) -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [(Name, Maybe [Located Int])]
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (IntMap FieldLabel
-> (Name, Maybe [Located Int]) -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_dup_fld_errs IntMap FieldLabel
flds') [(Name, Maybe [Located Int])]
sub_names
             ; let fld_env :: [(ConLikeName, ConInfo)]
fld_env  = [(Name, Maybe [Located Int])]
-> IntMap FieldLabel -> [(ConLikeName, ConInfo)]
mk_fld_env [(Name, Maybe [Located Int])]
sub_names IntMap FieldLabel
flds'
                   con_gres :: [GlobalRdrElt]
con_gres = ((ConLikeName, ConInfo) -> GlobalRdrElt)
-> [(ConLikeName, ConInfo)] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map (Parent -> (ConLikeName, ConInfo) -> GlobalRdrElt
mkLocalConLikeGRE (Name -> Parent
ParentIs Name
main_name)) [(ConLikeName, ConInfo)]
fld_env
                   field_gres :: [GlobalRdrElt]
field_gres = Parent -> [(ConLikeName, ConInfo)] -> [GlobalRdrElt]
mkLocalFieldGREs (Name -> Parent
ParentIs Name
main_name) [(ConLikeName, ConInfo)]
fld_env
               -- NB: the data family name is not bound here,
               -- so we don't return a GlobalRdrElt for it here!
             ; [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ([GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt])
-> [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall a b. (a -> b) -> a -> b
$ [GlobalRdrElt]
con_gres [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. [a] -> [a] -> [a]
++ [GlobalRdrElt]
field_gres }

    -- Add errors if a constructor has a duplicate record field.
    add_dup_fld_errs :: IntMap FieldLabel
                     -> (Name, Maybe [Located Int])
                     -> IOEnv (Env TcGblEnv TcLclEnv) ()
    add_dup_fld_errs :: IntMap FieldLabel
-> (Name, Maybe [Located Int]) -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_dup_fld_errs IntMap FieldLabel
all_flds (Name
con, Maybe [Located Int]
mb_con_flds)
      | Just [Located Int]
con_flds <- Maybe [Located Int]
mb_con_flds
      , let ([Located Int]
_, [NonEmpty (Located Int)]
dups) = (Located Int -> Located Int -> Ordering)
-> [Located Int] -> ([Located Int], [NonEmpty (Located Int)])
forall a. (a -> a -> Ordering) -> [a] -> ([a], [NonEmpty a])
removeDups ((Located Int -> Int) -> Located Int -> Located Int -> Ordering
forall a b. Ord a => (b -> a) -> b -> b -> Ordering
comparing Located Int -> Int
forall l e. GenLocated l e -> e
unLoc) [Located Int]
con_flds
      = [NonEmpty (Located Int)]
-> (NonEmpty (Located Int) -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (f :: * -> *) a b.
(Foldable t, Applicative f) =>
t a -> (a -> f b) -> f ()
for_ [NonEmpty (Located Int)]
dups ((NonEmpty (Located Int) -> IOEnv (Env TcGblEnv TcLclEnv) ())
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> (NonEmpty (Located Int) -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$ \ NonEmpty (Located Int)
dup_flds ->
          -- Report the error at the location of the second occurrence
          -- of the duplicate field.
          let loc :: SrcSpan
loc =
                case NonEmpty (Located Int)
dup_flds of
                  Located Int
_ :| ( L SrcSpan
loc Int
_ : [Located Int]
_) -> SrcSpan
loc
                  L SrcSpan
loc Int
_ :| [Located Int]
_ -> SrcSpan
loc
              dup_rdrs :: NonEmpty RdrName
dup_rdrs = (Located Int -> RdrName)
-> NonEmpty (Located Int) -> NonEmpty RdrName
forall a b. (a -> b) -> NonEmpty a -> NonEmpty b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Name -> RdrName
nameRdrName (Name -> RdrName)
-> (Located Int -> Name) -> Located Int -> RdrName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. FieldLabel -> Name
flSelector (FieldLabel -> Name)
-> (Located Int -> FieldLabel) -> Located Int -> Name
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (IntMap FieldLabel
all_flds IntMap FieldLabel -> Int -> FieldLabel
forall a. IntMap a -> Int -> a
IntMap.!) (Int -> FieldLabel)
-> (Located Int -> Int) -> Located Int -> FieldLabel
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Located Int -> Int
forall l e. GenLocated l e -> e
unLoc) NonEmpty (Located Int)
dup_flds
          in SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addErrAt SrcSpan
loc (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$ RecordFieldPart -> NonEmpty RdrName -> TcRnMessage
TcRnDuplicateFieldName (Name -> RecordFieldPart
RecordFieldDecl Name
con) NonEmpty RdrName
dup_rdrs
      | Bool
otherwise
      = () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()

newRecordFieldLabel :: DuplicateRecordFields -> FieldSelectors -> [Name] -> LFieldOcc GhcPs -> RnM FieldLabel
newRecordFieldLabel :: DuplicateRecordFields
-> FieldSelectors
-> [Name]
-> LFieldOcc (GhcPass 'Parsed)
-> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
newRecordFieldLabel DuplicateRecordFields
_ FieldSelectors
_ [] LFieldOcc (GhcPass 'Parsed)
_ = String -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
forall a. HasCallStack => String -> a
error String
"newRecordFieldLabel: datatype has no constructors!"
newRecordFieldLabel DuplicateRecordFields
dup_fields_ok FieldSelectors
has_sel (Name
dc:[Name]
_) (L SrcAnn NoEpAnns
loc (FieldOcc XCFieldOcc (GhcPass 'Parsed)
_ (L SrcSpanAnnN
_ RdrName
fld)))
  = do { Name
selName <- GenLocated SrcSpanAnnN RdrName -> RnM Name
newTopSrcBinder (GenLocated SrcSpanAnnN RdrName -> RnM Name)
-> GenLocated SrcSpanAnnN RdrName -> RnM Name
forall a b. (a -> b) -> a -> b
$ SrcSpanAnnN -> RdrName -> GenLocated SrcSpanAnnN RdrName
forall l e. l -> e -> GenLocated l e
L (SrcAnn NoEpAnns -> SrcSpanAnnN
forall a ann. SrcSpanAnn' a -> SrcAnn ann
l2l SrcAnn NoEpAnns
loc) (RdrName -> GenLocated SrcSpanAnnN RdrName)
-> RdrName -> GenLocated SrcSpanAnnN RdrName
forall a b. (a -> b) -> a -> b
$ RdrName
field
       ; FieldLabel -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (FieldLabel -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel)
-> FieldLabel -> IOEnv (Env TcGblEnv TcLclEnv) FieldLabel
forall a b. (a -> b) -> a -> b
$ FieldLabel { flHasDuplicateRecordFields :: DuplicateRecordFields
flHasDuplicateRecordFields = DuplicateRecordFields
dup_fields_ok
                             , flHasFieldSelector :: FieldSelectors
flHasFieldSelector = FieldSelectors
has_sel
                             , flSelector :: Name
flSelector = Name
selName } }
  where
    fld_occ :: OccName
fld_occ = RdrName -> OccName
rdrNameOcc RdrName
fld
    dc_fs :: FastString
dc_fs = OccName -> FastString
occNameFS (OccName -> FastString) -> OccName -> FastString
forall a b. (a -> b) -> a -> b
$ Name -> OccName
nameOccName Name
dc
    field :: RdrName
field
      -- Use an Exact RdrName as-is, to preserve the bindings
      -- of an already renamer-resolved field and its use
      -- sites. This is needed to correctly support record
      -- selectors in Template Haskell. See Note [Binders in
      -- Template Haskell] in "GHC.ThToHs" and Note [Looking up
      -- Exact RdrNames] in "GHC.Rename.Env".
      | RdrName -> Bool
isExact RdrName
fld
      = Bool -> SDoc -> RdrName -> RdrName
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (OccName -> Maybe FastString
fieldOcc_maybe OccName
fld_occ Maybe FastString -> Maybe FastString -> Bool
forall a. Eq a => a -> a -> Bool
== FastString -> Maybe FastString
forall a. a -> Maybe a
Just FastString
dc_fs)
          ([SDoc] -> SDoc
forall doc. IsDoc doc => [doc] -> doc
vcat [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"newRecordFieldLabel: incorrect namespace for exact Name" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> SDoc -> SDoc
quotes (RdrName -> SDoc
forall a. Outputable a => a -> SDoc
ppr RdrName
fld)
                , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"expected namespace:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> NameSpace -> SDoc
pprNameSpace (FastString -> NameSpace
fieldName FastString
dc_fs)
                , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"  actual namespace:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> NameSpace -> SDoc
pprNameSpace (OccName -> NameSpace
occNameSpace OccName
fld_occ) ])
        RdrName
fld

      -- Field names produced by the parser are namespaced with VarName.
      -- Here we namespace them according to the first constructor.
      -- See Note [Record field namespacing] in GHC.Types.Name.Occurrence.
      | Bool
otherwise
      = OccName -> RdrName
mkRdrUnqual (OccName -> RdrName) -> OccName -> RdrName
forall a b. (a -> b) -> a -> b
$ HasDebugCallStack => FastString -> OccName -> OccName
FastString -> OccName -> OccName
varToRecFieldOcc FastString
dc_fs OccName
fld_occ

{-
Note [Looking up family names in family instances]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Consider

  module M where
    type family T a :: *
    type instance M.T Int = Bool

We might think that we can simply use 'lookupOccRn' when processing the type
instance to look up 'M.T'.  Alas, we can't!  The type family declaration is in
the *same* HsGroup as the type instance declaration.  Hence, as we are
currently collecting the binders declared in that HsGroup, these binders will
not have been added to the global environment yet.

Solution is simple: process the type family declarations first, extend
the environment, and then process the type instances.


************************************************************************
*                                                                      *
\subsection{Filtering imports}
*                                                                      *
************************************************************************

@filterImports@ takes the @ExportEnv@ telling what the imported module makes
available, and filters it through the import spec (if any).

Note [Dealing with imports]
~~~~~~~~~~~~~~~~~~~~~~~~~~~
For import M( ies ), we take each AvailInfo from the mi_exports of M, and make

  imp_occ_env :: OccEnv (NameEnv ImpOccItem)

This map contains one entry for each OccName that M exports, mapping each OccName
to the following information:

  1. the GlobalRdrElt corresponding to the OccName,
  2. whether this GlobalRdrElt was the parent in the AvailInfo we found
     the OccName in.
  3. the GlobalRdrElts that were bundled together in the AvailInfo we found
    this OccName in (not including the parent),

We need (2) and (3) during the construction of the OccEnv because of associated
types and bundled pattern synonyms, respectively.
(3) is explained in Note [Importing PatternSynonyms].

To explain (2), consider for example:

  module M where
    class    C a    where { data T a }
    instance C Int  where { data T Int = T1 | T2 }
    instance C Bool where { data T Int = T3 }

Here, M's exports avails are (recalling the AvailTC invariant from GHC.Types.Avail)

  C(C,T), T(T,T1,T2,T3)

Notice that T appears *twice*, once as a child and once as a parent. From
these two exports, respectively, during construction of the imp_occ_env, we begin
by associating the following two elements with the key T:

  T -> ImpOccItem { imp_item = gre1, imp_bundled = [C,T]     , imp_is_parent = False }
  T -> ImpOccItem { imp_item = gre2, imp_bundled = [T1,T2,T3], imp_is_parent = True  }

where `gre1`, `gre2` are two GlobalRdrElts with greName T.
We combine these (in function 'combine' in 'mkImportOccEnv') by discarding the
non-parent item, thusly:

  T -> IE_ITem { imp_item = gre1 `plusGRE` gre2, imp_bundled = [T1,T2,T3], imp_is_parent = True }

Note the `plusGRE`: this ensures we don't drop parent information;
see Note [Preserve parent information when combining import OccEnvs].

So the overall imp_occ_env is:

  C  -> ImpOccItem { imp_item = C,  imp_bundled = [T       ], imp_is_parent = True  }
  T  -> ImpOccItem { imp_item = T , imp_bundled = [T1,T2,T3], imp_is_parent = True  }
  T1 -> ImpOccItem { imp_item = T1, imp_bundled = [T1,T2,T3], imp_is_parent = False }
    -- similarly for T2, T3

Note that the imp_occ_env will have entries for data constructors too,
although we never look up data constructors.

Note [Importing PatternSynonyms]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
As described in Note [Dealing with imports], associated types can lead to the
same Name appearing twice, both as a child and once as a parent, when
constructing the imp_occ_env.  The same thing can happen with pattern synonyms
if they are exported bundled with a type.

A simplified example, based on #11959:

  {-# LANGUAGE PatternSynonyms #-}
  module M (T(P), pattern P) where  -- Duplicate export warning, but allowed
    data T = MkT
    pattern P = MkT

Here we have T(P) and P in export_avails, and respectively construct both

  P -> ImpOccItem { imp_item = P, imp_bundled = [P], imp_is_parent = False }
  P -> ImpOccItem { imp_item = P, imp_bundled = [] , imp_is_parent = False }

We combine these by dropping the one with no siblings, leaving us with:

  P -> ImpOccItem { imp_item = P, imp_bundled = [P], imp_is_parent = False }

That is, we simply discard the non-bundled Avail.

Note [Importing DuplicateRecordFields]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In filterImports, another complicating factor is DuplicateRecordFields.
Suppose we have:

  {-# LANGUAGE DuplicateRecordFields #-}
  module M (S(foo), T(foo)) where
    data S = MkS { foo :: Int }
    data T = MkT { foo :: Int }

  module N where
    import M (foo)    -- this is allowed (A)
    import M (S(foo)) -- this is allowed (B)

Here M exports 'foo' at two different OccNames, with different namespaces for
the two construtors MkS and MkT. Then, when we look up 'foo' in lookup_names
for case (A), we have a variable foo but must look in all the record field
namespaces to find the two fields (and hence two different Avails).
Whereas in case (B) we reach the lookup_ie case for IEThingWith,
which looks up 'S' and then finds the unique 'foo' amongst its children.

See T16745 for a test of this.

Note [Preserve parent information when combining import OccEnvs]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When discarding one ImpOccItem in favour of another, as described in
Note [Dealing with imports], we must make sure to combine the GREs so that
we don't lose information.

Consider for example #24084:

  module M1 where { class C a where { type T a } }
  module M2 ( module M1 ) where { import M1 }
  module M3 where { import M2 ( C, T ); instance C () where T () = () }

When processing the import list of `M3`, we will have two `Avail`s attached
to `T`, namely `C(C, T)` and `T(T)`. We combine them in the `combine` function
of `mkImportOccEnv`; as described in Note [Dealing with imports] we discard
`C(C, T)` in favour of `T(T)`. However, in doing so, we **must not**
discard the information want that `C` is the parent of `T`. Indeed,
losing track of this information can cause errors when importing,
as we could get an error of the form

  ‘T’ is not a (visible) associated type of class ‘C’

This explains why we use `plusGRE` when combining the two ImpOccItems, even
though we are discarding one in favour of the other.
-}

-- | All the 'GlobalRdrElt's associated with an 'AvailInfo'.
gresFromAvail :: HasDebugCallStack
              => HscEnv -> Maybe ImportSpec -> AvailInfo -> [GlobalRdrElt]
gresFromAvail :: HasDebugCallStack =>
HscEnv -> Maybe ImportSpec -> AvailInfo -> [GlobalRdrElt]
gresFromAvail HscEnv
hsc_env Maybe ImportSpec
prov AvailInfo
avail =
  [ Name -> GREInfo -> GlobalRdrElt
mk_gre Name
nm GREInfo
info
  | Name
nm <- AvailInfo -> [Name]
availNames AvailInfo
avail
  , let info :: GREInfo
info = HasDebugCallStack => HscEnv -> Name -> GREInfo
HscEnv -> Name -> GREInfo
lookupGREInfo HscEnv
hsc_env Name
nm ]
  where

    mk_gre :: Name -> GREInfo -> GlobalRdrElt
mk_gre Name
n GREInfo
info
      = case Maybe ImportSpec
prov of
            -- Nothing => bound locally
            -- Just is => imported from 'is'
          Maybe ImportSpec
Nothing -> GRE { gre_name :: Name
gre_name = Name
n, gre_par :: Parent
gre_par = Name -> AvailInfo -> Parent
mkParent Name
n AvailInfo
avail
                         , gre_lcl :: Bool
gre_lcl = Bool
True, gre_imp :: Bag ImportSpec
gre_imp = Bag ImportSpec
forall a. Bag a
emptyBag
                         , gre_info :: GREInfo
gre_info = GREInfo
info }
          Just ImportSpec
is -> GRE { gre_name :: Name
gre_name = Name
n, gre_par :: Parent
gre_par = Name -> AvailInfo -> Parent
mkParent Name
n AvailInfo
avail
                         , gre_lcl :: Bool
gre_lcl = Bool
False, gre_imp :: Bag ImportSpec
gre_imp = ImportSpec -> Bag ImportSpec
forall a. a -> Bag a
unitBag ImportSpec
is
                         , gre_info :: GREInfo
gre_info = GREInfo
info }

-- | All the 'GlobalRdrElt's associated with a collection of 'AvailInfo's.
gresFromAvails :: HscEnv -> Maybe ImportSpec -> [AvailInfo] -> [GlobalRdrElt]
gresFromAvails :: HscEnv -> Maybe ImportSpec -> [AvailInfo] -> [GlobalRdrElt]
gresFromAvails HscEnv
hsc_env Maybe ImportSpec
prov = (AvailInfo -> [GlobalRdrElt]) -> [AvailInfo] -> [GlobalRdrElt]
forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap (HasDebugCallStack =>
HscEnv -> Maybe ImportSpec -> AvailInfo -> [GlobalRdrElt]
HscEnv -> Maybe ImportSpec -> AvailInfo -> [GlobalRdrElt]
gresFromAvail HscEnv
hsc_env Maybe ImportSpec
prov)

filterImports
    :: HasDebugCallStack
    => HscEnv
    -> ModIface
    -> ImpDeclSpec
         -- ^ Import spec
    -> Maybe (ImportListInterpretation, LocatedL [LIE GhcPs])
         -- ^ Whether this is a "hiding" import list
    -> RnM (Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]), -- Import spec w/ Names
            [GlobalRdrElt])                   -- Same again, but in GRE form
filterImports :: HasDebugCallStack =>
HscEnv
-> ModIface
-> ImpDeclSpec
-> Maybe
     (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
-> RnM
     (Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]),
      [GlobalRdrElt])
filterImports HscEnv
hsc_env ModIface
iface ImpDeclSpec
decl_spec Maybe (ImportListInterpretation, LocatedL [LIE (GhcPass 'Parsed)])
Nothing
  = (Maybe
   (ImportListInterpretation,
    LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
 [GlobalRdrElt])
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (Maybe
        (ImportListInterpretation,
         LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
      [GlobalRdrElt])
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (Maybe
  (ImportListInterpretation,
   LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)])
forall a. Maybe a
Nothing, HscEnv -> Maybe ImportSpec -> [AvailInfo] -> [GlobalRdrElt]
gresFromAvails HscEnv
hsc_env (ImportSpec -> Maybe ImportSpec
forall a. a -> Maybe a
Just ImportSpec
imp_spec) [AvailInfo]
all_avails)
  where
    all_avails :: [AvailInfo]
all_avails = ModIface -> [AvailInfo]
forall (phase :: ModIfacePhase). ModIface_ phase -> [AvailInfo]
mi_exports ModIface
iface
    imp_spec :: ImportSpec
imp_spec = ImpSpec { is_decl :: ImpDeclSpec
is_decl = ImpDeclSpec
decl_spec, is_item :: ImpItemSpec
is_item = ImpItemSpec
ImpAll }

filterImports HscEnv
hsc_env ModIface
iface ImpDeclSpec
decl_spec (Just (ImportListInterpretation
want_hiding, L SrcSpanAnnL
l [LIE (GhcPass 'Parsed)]
import_items))
  = do  -- check for errors, convert RdrNames to Names
        [[(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]]
items1 <- (GenLocated SrcSpanAnnA (IE (GhcPass 'Parsed))
 -> IOEnv
      (Env TcGblEnv TcLclEnv)
      [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])])
-> [GenLocated SrcSpanAnnA (IE (GhcPass 'Parsed))]
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     [[(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM LIE (GhcPass 'Parsed) -> TcRn [(LIE GhcRn, [GlobalRdrElt])]
GenLocated SrcSpanAnnA (IE (GhcPass 'Parsed))
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
lookup_lie [LIE (GhcPass 'Parsed)]
[GenLocated SrcSpanAnnA (IE (GhcPass 'Parsed))]
import_items

        let items2 :: [(LIE GhcRn, [GlobalRdrElt])]
            items2 :: [(LIE GhcRn, [GlobalRdrElt])]
items2 = [[(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]]
-> [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [[(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]]
items1
                -- NB we may have duplicates, and several items
                --    for the same parent; e.g N(x) and N(y)

            gres :: [GlobalRdrElt]
gres = case ImportListInterpretation
want_hiding of
              ImportListInterpretation
Exactly ->
                ((GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])
 -> [GlobalRdrElt])
-> [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
-> [GlobalRdrElt]
forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap (ImpDeclSpec -> (LIE GhcRn, [GlobalRdrElt]) -> [GlobalRdrElt]
gresFromIE ImpDeclSpec
decl_spec) [(LIE GhcRn, [GlobalRdrElt])]
[(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
items2
              ImportListInterpretation
EverythingBut ->
                let hidden_names :: Defs
hidden_names = [Name] -> Defs
mkNameSet ([Name] -> Defs) -> [Name] -> Defs
forall a b. (a -> b) -> a -> b
$ ((GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt]) -> [Name])
-> [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])] -> [Name]
forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap ((GlobalRdrElt -> Name) -> [GlobalRdrElt] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName ([GlobalRdrElt] -> [Name])
-> ((GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])
    -> [GlobalRdrElt])
-> (GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])
-> [Name]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])
-> [GlobalRdrElt]
forall a b. (a, b) -> b
snd) [(LIE GhcRn, [GlobalRdrElt])]
[(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
items2
                    keep :: Name -> Bool
keep Name
n = Bool -> Bool
not (Name
n Name -> Defs -> Bool
`elemNameSet` Defs
hidden_names)
                    all_gres :: [GlobalRdrElt]
all_gres = HscEnv -> Maybe ImportSpec -> [AvailInfo] -> [GlobalRdrElt]
gresFromAvails HscEnv
hsc_env (ImportSpec -> Maybe ImportSpec
forall a. a -> Maybe a
Just ImportSpec
hiding_spec) [AvailInfo]
all_avails
                in (GlobalRdrElt -> Bool) -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. (a -> Bool) -> [a] -> [a]
filter (Name -> Bool
keep (Name -> Bool) -> (GlobalRdrElt -> Name) -> GlobalRdrElt -> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName) [GlobalRdrElt]
all_gres

        (Maybe
   (ImportListInterpretation,
    LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
 [GlobalRdrElt])
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (Maybe
        (ImportListInterpretation,
         LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]),
      [GlobalRdrElt])
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ((ImportListInterpretation,
 LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)])
-> Maybe
     (ImportListInterpretation,
      LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)])
forall a. a -> Maybe a
Just (ImportListInterpretation
want_hiding, SrcSpanAnnL
-> [GenLocated SrcSpanAnnA (IE GhcRn)]
-> LocatedL [GenLocated SrcSpanAnnA (IE GhcRn)]
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnL
l (((GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])
 -> GenLocated SrcSpanAnnA (IE GhcRn))
-> [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
-> [GenLocated SrcSpanAnnA (IE GhcRn)]
forall a b. (a -> b) -> [a] -> [b]
map (GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])
-> GenLocated SrcSpanAnnA (IE GhcRn)
forall a b. (a, b) -> a
fst [(LIE GhcRn, [GlobalRdrElt])]
[(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
items2)), [GlobalRdrElt]
gres)
  where
    import_mod :: Module
import_mod = ModIface -> Module
forall (phase :: ModIfacePhase). ModIface_ phase -> Module
mi_module ModIface
iface
    all_avails :: [AvailInfo]
all_avails = ModIface -> [AvailInfo]
forall (phase :: ModIfacePhase). ModIface_ phase -> [AvailInfo]
mi_exports ModIface
iface
    hiding_spec :: ImportSpec
hiding_spec = ImpSpec { is_decl :: ImpDeclSpec
is_decl = ImpDeclSpec
decl_spec, is_item :: ImpItemSpec
is_item = ImpItemSpec
ImpAll }
    imp_occ_env :: OccEnv (NameEnv ImpOccItem)
imp_occ_env = HscEnv -> ImpDeclSpec -> [AvailInfo] -> OccEnv (NameEnv ImpOccItem)
mkImportOccEnv HscEnv
hsc_env ImpDeclSpec
decl_spec [AvailInfo]
all_avails

    -- Look up a parent (type constructor, class or data constructor)
    -- in an import.
    lookup_parent :: IE GhcPs -> RdrName -> IELookupM ImpOccItem
    lookup_parent :: IE (GhcPass 'Parsed) -> RdrName -> IELookupM ImpOccItem
lookup_parent IE (GhcPass 'Parsed)
ie RdrName
rdr =
      Bool -> SDoc -> IELookupM ImpOccItem -> IELookupM ImpOccItem
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (Bool -> Bool
not (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$ NameSpace -> Bool
isVarNameSpace NameSpace
ns)
        ([SDoc] -> SDoc
forall doc. IsDoc doc => [doc] -> doc
vcat [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"filterImports lookup_parent: unexpected variable"
              , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"rdr:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> RdrName -> SDoc
forall a. Outputable a => a -> SDoc
ppr RdrName
rdr
              , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"namespace:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> NameSpace -> SDoc
pprNameSpace NameSpace
ns ]) (IELookupM ImpOccItem -> IELookupM ImpOccItem)
-> IELookupM ImpOccItem -> IELookupM ImpOccItem
forall a b. (a -> b) -> a -> b
$
      do { NonEmpty ImpOccItem
xs <- IE (GhcPass 'Parsed) -> RdrName -> IELookupM (NonEmpty ImpOccItem)
lookup_names IE (GhcPass 'Parsed)
ie RdrName
rdr
         ; case NonEmpty ImpOccItem
xs of
            ImpOccItem
cax :| [] -> ImpOccItem -> IELookupM ImpOccItem
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return ImpOccItem
cax
            NonEmpty ImpOccItem
_         -> String -> SDoc -> IELookupM ImpOccItem
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"filter_imports lookup_parent ambiguous" (SDoc -> IELookupM ImpOccItem) -> SDoc -> IELookupM ImpOccItem
forall a b. (a -> b) -> a -> b
$
                           [SDoc] -> SDoc
forall doc. IsDoc doc => [doc] -> doc
vcat [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"rdr:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> RdrName -> SDoc
forall a. Outputable a => a -> SDoc
ppr RdrName
rdr
                                , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"lookups:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> NonEmpty GlobalRdrElt -> SDoc
forall a. Outputable a => a -> SDoc
ppr ((ImpOccItem -> GlobalRdrElt)
-> NonEmpty ImpOccItem -> NonEmpty GlobalRdrElt
forall a b. (a -> b) -> NonEmpty a -> NonEmpty b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap ImpOccItem -> GlobalRdrElt
imp_item NonEmpty ImpOccItem
xs) ] }
              -- Looking up non-variables is always unambiguous,
              -- as there can be at most one corresponding item
              -- in the imp_occ_env.
              -- See item (1) of Note [Exporting duplicate declarations]
              -- in GHC.Tc.Gen.Export.
      where
        occ :: OccName
occ = RdrName -> OccName
rdrNameOcc RdrName
rdr
        ns :: NameSpace
ns  = OccName -> NameSpace
occNameSpace OccName
occ

    -- Look up a RdrName used in an import, returning multiple values if there
    -- are several fields with the same name exposed by the module
    lookup_names :: IE GhcPs -> RdrName -> IELookupM (NonEmpty ImpOccItem)
    lookup_names :: IE (GhcPass 'Parsed) -> RdrName -> IELookupM (NonEmpty ImpOccItem)
lookup_names IE (GhcPass 'Parsed)
ie RdrName
rdr
       | RdrName -> Bool
isQual RdrName
rdr
       = IELookupError -> IELookupM (NonEmpty ImpOccItem)
forall a. IELookupError -> IELookupM a
failLookupWith (RdrName -> IELookupError
QualImportError RdrName
rdr)
       | Bool
otherwise
       = case [ImpOccItem]
lookups of
           []         -> IELookupError -> IELookupM (NonEmpty ImpOccItem)
forall a. IELookupError -> IELookupM a
failLookupWith (IE (GhcPass 'Parsed) -> IsSubordinate -> IELookupError
BadImport IE (GhcPass 'Parsed)
ie IsSubordinate
IsNotSubordinate)
           ImpOccItem
item:[ImpOccItem]
items -> NonEmpty ImpOccItem -> IELookupM (NonEmpty ImpOccItem)
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return (NonEmpty ImpOccItem -> IELookupM (NonEmpty ImpOccItem))
-> NonEmpty ImpOccItem -> IELookupM (NonEmpty ImpOccItem)
forall a b. (a -> b) -> a -> b
$ ImpOccItem
item ImpOccItem -> [ImpOccItem] -> NonEmpty ImpOccItem
forall a. a -> [a] -> NonEmpty a
:| [ImpOccItem]
items
      where
        lookups :: [ImpOccItem]
lookups = (NameEnv ImpOccItem -> [ImpOccItem])
-> [NameEnv ImpOccItem] -> [ImpOccItem]
forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap NameEnv ImpOccItem -> [ImpOccItem]
forall a. NameEnv a -> [a]
nonDetNameEnvElts
                ([NameEnv ImpOccItem] -> [ImpOccItem])
-> [NameEnv ImpOccItem] -> [ImpOccItem]
forall a b. (a -> b) -> a -> b
$ WhichGREs GREInfo
-> OccEnv (NameEnv ImpOccItem) -> OccName -> [NameEnv ImpOccItem]
lookupImpOccEnv (FieldsOrSelectors -> WhichGREs GREInfo
RelevantGREsFOS FieldsOrSelectors
WantNormal) OccEnv (NameEnv ImpOccItem)
imp_occ_env (RdrName -> OccName
rdrNameOcc RdrName
rdr)

    lookup_lie :: LIE GhcPs -> TcRn [(LIE GhcRn, [GlobalRdrElt])]
    lookup_lie :: LIE (GhcPass 'Parsed) -> TcRn [(LIE GhcRn, [GlobalRdrElt])]
lookup_lie (L SrcSpanAnnA
loc IE (GhcPass 'Parsed)
ieRdr)
        = SrcSpanAnnA
-> TcRn [(LIE GhcRn, [GlobalRdrElt])]
-> TcRn [(LIE GhcRn, [GlobalRdrElt])]
forall ann a. SrcSpanAnn' ann -> TcRn a -> TcRn a
setSrcSpanA SrcSpanAnnA
loc (TcRn [(LIE GhcRn, [GlobalRdrElt])]
 -> TcRn [(LIE GhcRn, [GlobalRdrElt])])
-> TcRn [(LIE GhcRn, [GlobalRdrElt])]
-> TcRn [(LIE GhcRn, [GlobalRdrElt])]
forall a b. (a -> b) -> a -> b
$
          do ([(IE GhcRn, [GlobalRdrElt])]
stuff, [IELookupWarning]
warns) <- (Maybe ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
 -> ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (Maybe ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM (([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> Maybe ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. a -> Maybe a -> a
fromMaybe ([],[])) (IOEnv
   (Env TcGblEnv TcLclEnv)
   (Maybe ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
 -> IOEnv
      (Env TcGblEnv TcLclEnv)
      ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (Maybe ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a b. (a -> b) -> a -> b
$
                               IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (Maybe ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
forall a. IELookupM a -> TcRn (Maybe a)
run_lookup (IE (GhcPass 'Parsed)
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
lookup_ie IE (GhcPass 'Parsed)
ieRdr)
             (IELookupWarning -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [IELookupWarning] -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addTcRnDiagnostic (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> (IELookupWarning -> IOEnv (Env TcGblEnv TcLclEnv) TcRnMessage)
-> IELookupWarning
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (m :: * -> *) b c a.
Monad m =>
(b -> m c) -> (a -> m b) -> a -> m c
<=< IELookupWarning -> IOEnv (Env TcGblEnv TcLclEnv) TcRnMessage
warning_msg) [IELookupWarning]
warns
             [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     [(GenLocated SrcSpanAnnA (IE GhcRn), [GlobalRdrElt])]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return [ (SrcSpanAnnA -> IE GhcRn -> GenLocated SrcSpanAnnA (IE GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
loc IE GhcRn
ie, [GlobalRdrElt]
gres) | (IE GhcRn
ie,[GlobalRdrElt]
gres) <- [(IE GhcRn, [GlobalRdrElt])]
stuff ]
        where

            -- Warn when importing T(..) and no children are brought in scope
            warning_msg :: IELookupWarning -> IOEnv (Env TcGblEnv TcLclEnv) TcRnMessage
warning_msg (DodgyImport GlobalRdrElt
n) =
              TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) TcRnMessage
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (DodgyImportsReason -> TcRnMessage
TcRnDodgyImports (GlobalRdrElt -> DodgyImportsReason
DodgyImportsEmptyParent GlobalRdrElt
n))
            warning_msg IELookupWarning
MissingImportList =
              TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) TcRnMessage
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (IE (GhcPass 'Parsed) -> TcRnMessage
TcRnMissingImportList IE (GhcPass 'Parsed)
ieRdr)
            warning_msg (BadImportW IE (GhcPass 'Parsed)
ie) = do
              -- 'BadImportW' is only constructed below in 'handle_bad_import', in
              -- the 'EverythingBut' case, so that's what we pass to
              -- 'badImportItemErr'.
              ImportLookupReason
reason <- ModIface
-> ImpDeclSpec
-> IE (GhcPass 'Parsed)
-> IsSubordinate
-> [AvailInfo]
-> TcRn ImportLookupReason
badImportItemErr ModIface
iface ImpDeclSpec
decl_spec IE (GhcPass 'Parsed)
ie IsSubordinate
IsNotSubordinate [AvailInfo]
all_avails
              TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) TcRnMessage
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (DodgyImportsReason -> TcRnMessage
TcRnDodgyImports (ImportLookupReason -> DodgyImportsReason
DodgyImportsHiding ImportLookupReason
reason))
            warning_msg (DeprecatedExport Name
n WarningTxt GhcRn
w) =
              TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) TcRnMessage
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (TcRnPragmaWarning {
                      pragma_warning_occ :: OccName
pragma_warning_occ = Name -> OccName
forall name. HasOccName name => name -> OccName
occName Name
n
                    , pragma_warning_msg :: WarningTxt GhcRn
pragma_warning_msg = WarningTxt GhcRn
w
                    , pragma_warning_import_mod :: ModuleName
pragma_warning_import_mod = Module -> ModuleName
forall unit. GenModule unit -> ModuleName
moduleName Module
import_mod
                    , pragma_warning_defined_mod :: Maybe ModuleName
pragma_warning_defined_mod = Maybe ModuleName
forall a. Maybe a
Nothing
                    })

            run_lookup :: IELookupM a -> TcRn (Maybe a)
            run_lookup :: forall a. IELookupM a -> TcRn (Maybe a)
run_lookup IELookupM a
m = case IELookupM a
m of
              Failed IELookupError
err -> do
                ImportLookupReason
msg <- IELookupError -> TcRn ImportLookupReason
lookup_err_msg IELookupError
err
                TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addErr (ImportLookupReason -> TcRnMessage
TcRnImportLookup ImportLookupReason
msg)
                Maybe a -> TcRn (Maybe a)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe a
forall a. Maybe a
Nothing
              Succeeded a
a -> Maybe a -> TcRn (Maybe a)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (a -> Maybe a
forall a. a -> Maybe a
Just a
a)

            lookup_err_msg :: IELookupError -> TcRn ImportLookupReason
lookup_err_msg IELookupError
err = case IELookupError
err of
              BadImport IE (GhcPass 'Parsed)
ie IsSubordinate
sub    -> ModIface
-> ImpDeclSpec
-> IE (GhcPass 'Parsed)
-> IsSubordinate
-> [AvailInfo]
-> TcRn ImportLookupReason
badImportItemErr ModIface
iface ImpDeclSpec
decl_spec IE (GhcPass 'Parsed)
ie IsSubordinate
sub [AvailInfo]
all_avails
              IELookupError
IllegalImport       -> ImportLookupReason -> TcRn ImportLookupReason
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure ImportLookupReason
ImportLookupIllegal
              QualImportError RdrName
rdr -> ImportLookupReason -> TcRn ImportLookupReason
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (RdrName -> ImportLookupReason
ImportLookupQualified RdrName
rdr)

        -- For each import item, we convert its RdrNames to Names,
        -- and at the same time compute all the GlobalRdrElt corresponding
        -- to what is actually imported by this item.
        -- Returns Nothing on error.
        --
        -- Returns a list because, with DuplicateRecordFields, a naked
        -- import/export of a record field can correspond to multiple
        -- different GlobalRdrElts. See Note [Importing DuplicateRecordFields].
    lookup_ie :: IE GhcPs
              -> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
    lookup_ie :: IE (GhcPass 'Parsed)
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
lookup_ie IE (GhcPass 'Parsed)
ie = IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
handle_bad_import (IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
 -> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a b. (a -> b) -> a -> b
$
      case IE (GhcPass 'Parsed)
ie of
        IEVar XIEVar (GhcPass 'Parsed)
_ (L SrcSpanAnnA
l IEWrappedName (GhcPass 'Parsed)
n) -> do
            -- See Note [Importing DuplicateRecordFields]
            NonEmpty ImpOccItem
xs <- IE (GhcPass 'Parsed) -> RdrName -> IELookupM (NonEmpty ImpOccItem)
lookup_names IE (GhcPass 'Parsed)
ie (IEWrappedName (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
forall (p :: Pass). IEWrappedName (GhcPass p) -> IdP (GhcPass p)
ieWrappedName IEWrappedName (GhcPass 'Parsed)
n)
            let gres :: [GlobalRdrElt]
gres = (ImpOccItem -> GlobalRdrElt) -> [ImpOccItem] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map ImpOccItem -> GlobalRdrElt
imp_item ([ImpOccItem] -> [GlobalRdrElt]) -> [ImpOccItem] -> [GlobalRdrElt]
forall a b. (a -> b) -> a -> b
$ NonEmpty ImpOccItem -> [ImpOccItem]
forall a. NonEmpty a -> [a]
NE.toList NonEmpty ImpOccItem
xs
                export_depr_warns :: [IELookupWarning]
export_depr_warns
                  | ImportListInterpretation
want_hiding ImportListInterpretation -> ImportListInterpretation -> Bool
forall a. Eq a => a -> a -> Bool
== ImportListInterpretation
Exactly
                      = (GlobalRdrElt -> Maybe IELookupWarning)
-> [GlobalRdrElt] -> [IELookupWarning]
forall a b. (a -> Maybe b) -> [a] -> [b]
mapMaybe GlobalRdrElt -> Maybe IELookupWarning
mk_depr_export_warning [GlobalRdrElt]
gres
                  | Bool
otherwise = []
            ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return ( [ (XIEVar GhcRn -> LIEWrappedName GhcRn -> IE GhcRn
forall pass. XIEVar pass -> LIEWrappedName pass -> IE pass
IEVar Maybe (LocatedP (WarningTxt GhcRn))
XIEVar GhcRn
forall a. Maybe a
Nothing (SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (IEWrappedName (GhcPass 'Parsed) -> IdP GhcRn -> IEWrappedName GhcRn
replaceWrappedName IEWrappedName (GhcPass 'Parsed)
n IdP GhcRn
Name
name)), [GlobalRdrElt
gre])
                     | GlobalRdrElt
gre <- [GlobalRdrElt]
gres
                     , let name :: Name
name = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre ]
                   , [IELookupWarning]
export_depr_warns )

        IEThingAll XIEThingAll (GhcPass 'Parsed)
_ (L SrcSpanAnnA
l IEWrappedName (GhcPass 'Parsed)
tc) -> do
            ImpOccItem GlobalRdrElt
gre [GlobalRdrElt]
child_gres Bool
_ <- IE (GhcPass 'Parsed) -> RdrName -> IELookupM ImpOccItem
lookup_parent IE (GhcPass 'Parsed)
ie (RdrName -> IELookupM ImpOccItem)
-> RdrName -> IELookupM ImpOccItem
forall a b. (a -> b) -> a -> b
$ IEWrappedName (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
forall (p :: Pass). IEWrappedName (GhcPass p) -> IdP (GhcPass p)
ieWrappedName IEWrappedName (GhcPass 'Parsed)
tc
            let name :: Name
name = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre
                imp_list_warn :: [IELookupWarning]
imp_list_warn

                  | [GlobalRdrElt] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GlobalRdrElt]
child_gres
                  -- e.g. f(..) or T(..) where T is a type synonym
                  = [GlobalRdrElt -> IELookupWarning
DodgyImport GlobalRdrElt
gre]

                  -- e.g. import M( T(..) )
                  | Bool -> Bool
not (ImpDeclSpec -> Bool
is_qual ImpDeclSpec
decl_spec)
                  = [IELookupWarning
MissingImportList]

                  | Bool
otherwise
                  = []

                renamed_ie :: IE GhcRn
renamed_ie = XIEThingAll GhcRn -> LIEWrappedName GhcRn -> IE GhcRn
forall pass. XIEThingAll pass -> LIEWrappedName pass -> IE pass
IEThingAll (Maybe (LocatedP (WarningTxt GhcRn))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
forall a. EpAnn a
noAnn) (SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (IEWrappedName (GhcPass 'Parsed) -> IdP GhcRn -> IEWrappedName GhcRn
replaceWrappedName IEWrappedName (GhcPass 'Parsed)
tc IdP GhcRn
Name
name))
                export_depr_warn :: [IELookupWarning]
export_depr_warn
                  | ImportListInterpretation
want_hiding ImportListInterpretation -> ImportListInterpretation -> Bool
forall a. Eq a => a -> a -> Bool
== ImportListInterpretation
Exactly
                      = Maybe IELookupWarning -> [IELookupWarning]
forall a. Maybe a -> [a]
maybeToList (Maybe IELookupWarning -> [IELookupWarning])
-> Maybe IELookupWarning -> [IELookupWarning]
forall a b. (a -> b) -> a -> b
$ GlobalRdrElt -> Maybe IELookupWarning
mk_depr_export_warning GlobalRdrElt
gre
                        -- We don't want to warn about the children as they
                        -- are not explicitly mentioned; the warning will
                        -- be emitted later on if they are used
                  | Bool
otherwise = []

            ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return ( [(IE GhcRn
renamed_ie, GlobalRdrElt
greGlobalRdrElt -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. a -> [a] -> [a]
:[GlobalRdrElt]
child_gres)]
                   , [IELookupWarning]
imp_list_warn [IELookupWarning] -> [IELookupWarning] -> [IELookupWarning]
forall a. [a] -> [a] -> [a]
++ [IELookupWarning]
export_depr_warn)


        IEThingAbs XIEThingAbs (GhcPass 'Parsed)
_ (L SrcSpanAnnA
l IEWrappedName (GhcPass 'Parsed)
tc')
            | ImportListInterpretation
want_hiding ImportListInterpretation -> ImportListInterpretation -> Bool
forall a. Eq a => a -> a -> Bool
== ImportListInterpretation
EverythingBut   -- hiding ( C )
                       -- Here the 'C' can be a data constructor
                       --  *or* a type/class, or even both
            -> let tc :: IdP (GhcPass 'Parsed)
tc = IEWrappedName (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
forall (p :: Pass). IEWrappedName (GhcPass p) -> IdP (GhcPass p)
ieWrappedName IEWrappedName (GhcPass 'Parsed)
tc'
                   tc_name :: IELookupM ImpOccItem
tc_name = IE (GhcPass 'Parsed) -> RdrName -> IELookupM ImpOccItem
lookup_parent IE (GhcPass 'Parsed)
ie IdP (GhcPass 'Parsed)
RdrName
tc
                   dc_name :: IELookupM ImpOccItem
dc_name = IE (GhcPass 'Parsed) -> RdrName -> IELookupM ImpOccItem
lookup_parent IE (GhcPass 'Parsed)
ie (RdrName -> NameSpace -> RdrName
setRdrNameSpace IdP (GhcPass 'Parsed)
RdrName
tc NameSpace
srcDataName)
               in
               case [IELookupM ImpOccItem] -> [ImpOccItem]
forall a. [IELookupM a] -> [a]
catIELookupM [ IELookupM ImpOccItem
tc_name, IELookupM ImpOccItem
dc_name ] of
                 []    -> IELookupError
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. IELookupError -> IELookupM a
failLookupWith (IE (GhcPass 'Parsed) -> IsSubordinate -> IELookupError
BadImport IE (GhcPass 'Parsed)
ie IsSubordinate
IsNotSubordinate)
                 [ImpOccItem]
names -> ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return ( [IEWrappedName (GhcPass 'Parsed)
-> SrcSpanAnnA -> GlobalRdrElt -> (IE GhcRn, [GlobalRdrElt])
forall {info}.
IEWrappedName (GhcPass 'Parsed)
-> SrcSpanAnnA
-> GlobalRdrEltX info
-> (IE GhcRn, [GlobalRdrEltX info])
mkIEThingAbs IEWrappedName (GhcPass 'Parsed)
tc' SrcSpanAnnA
l (ImpOccItem -> GlobalRdrElt
imp_item ImpOccItem
name) | ImpOccItem
name <- [ImpOccItem]
names], [])
            | Bool
otherwise
            -> do ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
gre } <- IE (GhcPass 'Parsed) -> RdrName -> IELookupM ImpOccItem
lookup_parent IE (GhcPass 'Parsed)
ie (IEWrappedName (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
forall (p :: Pass). IEWrappedName (GhcPass p) -> IdP (GhcPass p)
ieWrappedName IEWrappedName (GhcPass 'Parsed)
tc')
                  ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return ( [IEWrappedName (GhcPass 'Parsed)
-> SrcSpanAnnA -> GlobalRdrElt -> (IE GhcRn, [GlobalRdrElt])
forall {info}.
IEWrappedName (GhcPass 'Parsed)
-> SrcSpanAnnA
-> GlobalRdrEltX info
-> (IE GhcRn, [GlobalRdrEltX info])
mkIEThingAbs IEWrappedName (GhcPass 'Parsed)
tc' SrcSpanAnnA
l GlobalRdrElt
gre]
                         , Maybe IELookupWarning -> [IELookupWarning]
forall a. Maybe a -> [a]
maybeToList (Maybe IELookupWarning -> [IELookupWarning])
-> Maybe IELookupWarning -> [IELookupWarning]
forall a b. (a -> b) -> a -> b
$ GlobalRdrElt -> Maybe IELookupWarning
mk_depr_export_warning GlobalRdrElt
gre)

        IEThingWith (Maybe (LocatedP (WarningTxt (GhcPass 'Parsed)))
deprecation, EpAnn [AddEpAnn]
ann) ltc :: LIEWrappedName (GhcPass 'Parsed)
ltc@(L SrcSpanAnnA
l IEWrappedName (GhcPass 'Parsed)
rdr_tc) IEWildcard
wc [LIEWrappedName (GhcPass 'Parsed)]
rdr_ns -> do
           ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
gre, imp_bundled :: ImpOccItem -> [GlobalRdrElt]
imp_bundled = [GlobalRdrElt]
subnames }
               <- IE (GhcPass 'Parsed) -> RdrName -> IELookupM ImpOccItem
lookup_parent (XIEThingAbs (GhcPass 'Parsed)
-> LIEWrappedName (GhcPass 'Parsed) -> IE (GhcPass 'Parsed)
forall pass. XIEThingAbs pass -> LIEWrappedName pass -> IE pass
IEThingAbs (Maybe (LocatedP (WarningTxt (GhcPass 'Parsed)))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
forall a. EpAnn a
noAnn) LIEWrappedName (GhcPass 'Parsed)
ltc) (IEWrappedName (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
forall (p :: Pass). IEWrappedName (GhcPass p) -> IdP (GhcPass p)
ieWrappedName IEWrappedName (GhcPass 'Parsed)
rdr_tc)
           let name :: Name
name = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre

           -- Look up the children in the sub-names of the parent
           -- See Note [Importing DuplicateRecordFields]
           case [GlobalRdrElt]
-> [LIEWrappedName (GhcPass 'Parsed)]
-> MaybeErr
     [LIEWrappedName (GhcPass 'Parsed)] [LocatedA GlobalRdrElt]
lookupChildren [GlobalRdrElt]
subnames [LIEWrappedName (GhcPass 'Parsed)]
rdr_ns of

             Failed [LIEWrappedName (GhcPass 'Parsed)]
rdrs -> IELookupError
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. IELookupError -> IELookupM a
failLookupWith (IELookupError
 -> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IELookupError
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a b. (a -> b) -> a -> b
$
                            IE (GhcPass 'Parsed) -> IsSubordinate -> IELookupError
BadImport (XIEThingWith (GhcPass 'Parsed)
-> LIEWrappedName (GhcPass 'Parsed)
-> IEWildcard
-> [LIEWrappedName (GhcPass 'Parsed)]
-> IE (GhcPass 'Parsed)
forall pass.
XIEThingWith pass
-> LIEWrappedName pass
-> IEWildcard
-> [LIEWrappedName pass]
-> IE pass
IEThingWith (Maybe (LocatedP (WarningTxt (GhcPass 'Parsed)))
deprecation, EpAnn [AddEpAnn]
ann) LIEWrappedName (GhcPass 'Parsed)
ltc IEWildcard
wc [LIEWrappedName (GhcPass 'Parsed)]
rdrs) IsSubordinate
IsSubordinate
                                -- We are trying to import T( a,b,c,d ), and failed
                                -- to find 'b' and 'd'.  So we make up an import item
                                -- to report as failing, namely T( b, d ).
                                -- c.f. #15412

             Succeeded [LocatedA GlobalRdrElt]
childnames ->
                ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return ([ (XIEThingWith GhcRn
-> LIEWrappedName GhcRn
-> IEWildcard
-> [LIEWrappedName GhcRn]
-> IE GhcRn
forall pass.
XIEThingWith pass
-> LIEWrappedName pass
-> IEWildcard
-> [LIEWrappedName pass]
-> IE pass
IEThingWith (Maybe (LocatedP (WarningTxt GhcRn))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
ann) (SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l IEWrappedName GhcRn
name') IEWildcard
wc [LIEWrappedName GhcRn]
[GenLocated SrcSpanAnnA (IEWrappedName GhcRn)]
childnames'
                          ,[GlobalRdrElt]
gres)]
                       , [IELookupWarning]
export_depr_warns)

              where name' :: IEWrappedName GhcRn
name' = IEWrappedName (GhcPass 'Parsed) -> IdP GhcRn -> IEWrappedName GhcRn
replaceWrappedName IEWrappedName (GhcPass 'Parsed)
rdr_tc IdP GhcRn
Name
name
                    childnames' :: [GenLocated SrcSpanAnnA (IEWrappedName GhcRn)]
childnames' = (LocatedA GlobalRdrElt
 -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> [LocatedA GlobalRdrElt]
-> [GenLocated SrcSpanAnnA (IEWrappedName GhcRn)]
forall a b. (a -> b) -> [a] -> [b]
map (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
GenLocated SrcSpanAnnA Name
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
to_ie_post_rn (GenLocated SrcSpanAnnA Name
 -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> (LocatedA GlobalRdrElt -> GenLocated SrcSpanAnnA Name)
-> LocatedA GlobalRdrElt
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (GlobalRdrElt -> Name)
-> LocatedA GlobalRdrElt -> GenLocated SrcSpanAnnA Name
forall a b.
(a -> b) -> GenLocated SrcSpanAnnA a -> GenLocated SrcSpanAnnA b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName) [LocatedA GlobalRdrElt]
childnames
                    gres :: [GlobalRdrElt]
gres = GlobalRdrElt
gre GlobalRdrElt -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. a -> [a] -> [a]
: (LocatedA GlobalRdrElt -> GlobalRdrElt)
-> [LocatedA GlobalRdrElt] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map LocatedA GlobalRdrElt -> GlobalRdrElt
forall l e. GenLocated l e -> e
unLoc [LocatedA GlobalRdrElt]
childnames
                    export_depr_warns :: [IELookupWarning]
export_depr_warns
                      | ImportListInterpretation
want_hiding ImportListInterpretation -> ImportListInterpretation -> Bool
forall a. Eq a => a -> a -> Bool
== ImportListInterpretation
Exactly = (GlobalRdrElt -> Maybe IELookupWarning)
-> [GlobalRdrElt] -> [IELookupWarning]
forall a b. (a -> Maybe b) -> [a] -> [b]
mapMaybe GlobalRdrElt -> Maybe IELookupWarning
mk_depr_export_warning [GlobalRdrElt]
gres
                      | Bool
otherwise              = []

        IE (GhcPass 'Parsed)
_other -> IELookupError
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. IELookupError -> IELookupM a
failLookupWith IELookupError
IllegalImport
        -- could be IEModuleContents, IEGroup, IEDoc, IEDocNamed...
        -- all of those constitute errors.

      where
        mkIEThingAbs :: IEWrappedName (GhcPass 'Parsed)
-> SrcSpanAnnA
-> GlobalRdrEltX info
-> (IE GhcRn, [GlobalRdrEltX info])
mkIEThingAbs IEWrappedName (GhcPass 'Parsed)
tc SrcSpanAnnA
l GlobalRdrEltX info
gre
          = (XIEThingAbs GhcRn -> LIEWrappedName GhcRn -> IE GhcRn
forall pass. XIEThingAbs pass -> LIEWrappedName pass -> IE pass
IEThingAbs (Maybe (LocatedP (WarningTxt GhcRn))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
forall a. EpAnn a
noAnn) (SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (IEWrappedName (GhcPass 'Parsed) -> IdP GhcRn -> IEWrappedName GhcRn
replaceWrappedName IEWrappedName (GhcPass 'Parsed)
tc IdP GhcRn
Name
n)), [GlobalRdrEltX info
gre])
          where n :: Name
n = GlobalRdrEltX info -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrEltX info
gre

        handle_bad_import :: IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
handle_bad_import IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
m = IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> (IELookupError
    -> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a.
IELookupM a -> (IELookupError -> IELookupM a) -> IELookupM a
catchIELookup IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
m ((IELookupError
  -> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
 -> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> (IELookupError
    -> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning]))
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a b. (a -> b) -> a -> b
$ \IELookupError
err -> case IELookupError
err of
          BadImport IE (GhcPass 'Parsed)
ie IsSubordinate
_
            | ImportListInterpretation
want_hiding ImportListInterpretation -> ImportListInterpretation -> Bool
forall a. Eq a => a -> a -> Bool
== ImportListInterpretation
EverythingBut
            -> ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return ([], [IE (GhcPass 'Parsed) -> IELookupWarning
BadImportW IE (GhcPass 'Parsed)
ie])
          IELookupError
_ -> IELookupError
-> IELookupM ([(IE GhcRn, [GlobalRdrElt])], [IELookupWarning])
forall a. IELookupError -> IELookupM a
failLookupWith IELookupError
err

        mk_depr_export_warning :: GlobalRdrElt -> Maybe IELookupWarning
mk_depr_export_warning GlobalRdrElt
gre
          = Name -> WarningTxt GhcRn -> IELookupWarning
DeprecatedExport Name
name (WarningTxt GhcRn -> IELookupWarning)
-> Maybe (WarningTxt GhcRn) -> Maybe IELookupWarning
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> ModIfaceBackend -> Name -> Maybe (WarningTxt GhcRn)
mi_export_warn_fn (ModIface -> IfaceBackendExts 'ModIfaceFinal
forall (phase :: ModIfacePhase).
ModIface_ phase -> IfaceBackendExts phase
mi_final_exts ModIface
iface) Name
name
          where
            name :: Name
name = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre

type IELookupM = MaybeErr IELookupError

data IELookupWarning
  = BadImportW (IE GhcPs)
  | MissingImportList
  | DodgyImport GlobalRdrElt
  | DeprecatedExport Name (WarningTxt GhcRn)

-- | Is this import/export item a subordinate or not?
data IsSubordinate
  = IsSubordinate | IsNotSubordinate

data IELookupError
  = QualImportError RdrName
  | BadImport (IE GhcPs) IsSubordinate
  | IllegalImport

failLookupWith :: IELookupError -> IELookupM a
failLookupWith :: forall a. IELookupError -> IELookupM a
failLookupWith IELookupError
err = IELookupError -> MaybeErr IELookupError a
forall err val. err -> MaybeErr err val
Failed IELookupError
err

catchIELookup :: IELookupM a -> (IELookupError -> IELookupM a) -> IELookupM a
catchIELookup :: forall a.
IELookupM a -> (IELookupError -> IELookupM a) -> IELookupM a
catchIELookup IELookupM a
m IELookupError -> IELookupM a
h = case IELookupM a
m of
  Succeeded a
r -> a -> IELookupM a
forall a. a -> MaybeErr IELookupError a
forall (m :: * -> *) a. Monad m => a -> m a
return a
r
  Failed IELookupError
err  -> IELookupError -> IELookupM a
h IELookupError
err

catIELookupM :: [IELookupM a] -> [a]
catIELookupM :: forall a. [IELookupM a] -> [a]
catIELookupM [IELookupM a]
ms = [ a
a | Succeeded a
a <- [IELookupM a]
ms ]

-- | Information associated to an 'AvailInfo' used in constructing
-- an 'OccEnv' corresponding to imports.
--
-- See Note [Dealing with imports].
data ImpOccItem
  = ImpOccItem
      { ImpOccItem -> GlobalRdrElt
imp_item      :: GlobalRdrElt
        -- ^ The import item
      , ImpOccItem -> [GlobalRdrElt]
imp_bundled   :: [GlobalRdrElt]
        -- ^ Items bundled in the Avail this import item came from,
        -- not including the import item itself if it is a parent.
      , ImpOccItem -> Bool
imp_is_parent :: Bool
        -- ^ Is the import item a parent? See Note [Dealing with imports].
      }

instance Outputable ImpOccItem where
  ppr :: ImpOccItem -> SDoc
ppr (ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
item, imp_bundled :: ImpOccItem -> [GlobalRdrElt]
imp_bundled = [GlobalRdrElt]
bundled, imp_is_parent :: ImpOccItem -> Bool
imp_is_parent = Bool
is_par })
    = SDoc -> SDoc
forall doc. IsLine doc => doc -> doc
braces (SDoc -> SDoc) -> SDoc -> SDoc
forall a b. (a -> b) -> a -> b
$ [SDoc] -> SDoc
forall doc. IsLine doc => [doc] -> doc
hsep
       [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"ImpOccItem"
       , if Bool
is_par then String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"[is_par]" else SDoc
forall doc. IsOutput doc => doc
empty
       , Name -> SDoc
forall a. Outputable a => a -> SDoc
ppr (GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
item) SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> Parent -> SDoc
forall a. Outputable a => a -> SDoc
ppr (GlobalRdrElt -> Parent
forall info. GlobalRdrEltX info -> Parent
greParent GlobalRdrElt
item)
       , SDoc -> SDoc
forall doc. IsLine doc => doc -> doc
braces (SDoc -> SDoc) -> SDoc -> SDoc
forall a b. (a -> b) -> a -> b
$ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"bundled:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [Name] -> SDoc
forall a. Outputable a => a -> SDoc
ppr ((GlobalRdrElt -> Name) -> [GlobalRdrElt] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName [GlobalRdrElt]
bundled) ]

-- | Make an 'OccEnv' of all the imports.
--
-- Complicated by the fact that associated data types and pattern synonyms
-- can appear twice. See Note [Dealing with imports].
mkImportOccEnv :: HscEnv -> ImpDeclSpec -> [IfaceExport] -> OccEnv (NameEnv ImpOccItem)
mkImportOccEnv :: HscEnv -> ImpDeclSpec -> [AvailInfo] -> OccEnv (NameEnv ImpOccItem)
mkImportOccEnv HscEnv
hsc_env ImpDeclSpec
decl_spec [AvailInfo]
all_avails =
  (NameEnv ImpOccItem -> NameEnv ImpOccItem -> NameEnv ImpOccItem)
-> [(OccName, NameEnv ImpOccItem)] -> OccEnv (NameEnv ImpOccItem)
forall a. (a -> a -> a) -> [(OccName, a)] -> OccEnv a
mkOccEnv_C ((ImpOccItem -> ImpOccItem -> ImpOccItem)
-> NameEnv ImpOccItem -> NameEnv ImpOccItem -> NameEnv ImpOccItem
forall a. (a -> a -> a) -> NameEnv a -> NameEnv a -> NameEnv a
plusNameEnv_C ImpOccItem -> ImpOccItem -> ImpOccItem
combine)
    [ (OccName
occ, [(Name, ImpOccItem)] -> NameEnv ImpOccItem
forall a. [(Name, a)] -> NameEnv a
mkNameEnv [(Name
nm, GlobalRdrElt -> [GlobalRdrElt] -> Bool -> ImpOccItem
ImpOccItem GlobalRdrElt
g [GlobalRdrElt]
bundled Bool
is_parent)])
    | AvailInfo
avail <- [AvailInfo]
all_avails
    , let gs :: [GlobalRdrElt]
gs = HasDebugCallStack =>
HscEnv -> Maybe ImportSpec -> AvailInfo -> [GlobalRdrElt]
HscEnv -> Maybe ImportSpec -> AvailInfo -> [GlobalRdrElt]
gresFromAvail HscEnv
hsc_env (ImportSpec -> Maybe ImportSpec
forall a. a -> Maybe a
Just ImportSpec
hiding_spec) AvailInfo
avail
    , GlobalRdrElt
g <- [GlobalRdrElt]
gs
    , let nm :: Name
nm = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
g
          occ :: OccName
occ = GlobalRdrElt -> OccName
forall info. GlobalRdrEltX info -> OccName
greOccName GlobalRdrElt
g
          (Bool
is_parent, [GlobalRdrElt]
bundled) = case AvailInfo
avail of
            AvailTC Name
c [Name]
_
              -> if Name
c Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
== Name
nm -- (Recall the AvailTC invariant)
                 then ( Bool
True, case [GlobalRdrElt]
gs of { GlobalRdrElt
g0 : [GlobalRdrElt]
gs' | GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
g0 Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
== Name
nm -> [GlobalRdrElt]
gs'; [GlobalRdrElt]
_ -> [GlobalRdrElt]
gs } )
                 else ( Bool
False, [GlobalRdrElt]
gs )
            AvailInfo
_ -> ( Bool
False, [] )
    ]
  where

    hiding_spec :: ImportSpec
hiding_spec = ImpSpec { is_decl :: ImpDeclSpec
is_decl = ImpDeclSpec
decl_spec, is_item :: ImpItemSpec
is_item = ImpItemSpec
ImpAll }

    -- See Note [Dealing with imports]
    -- 'combine' may be called for associated data types which appear
    -- twice in the all_avails. In the example, we have two Avails for T,
    -- namely T(T,T1,T2,T3) and C(C,T), and we combine them by dropping the
    -- latter, in which T is not the parent.
    combine :: ImpOccItem -> ImpOccItem -> ImpOccItem
    combine :: ImpOccItem -> ImpOccItem -> ImpOccItem
combine item1 :: ImpOccItem
item1@(ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
gre1, imp_is_parent :: ImpOccItem -> Bool
imp_is_parent = Bool
is_parent1 })
            item2 :: ImpOccItem
item2@(ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
gre2, imp_is_parent :: ImpOccItem -> Bool
imp_is_parent = Bool
is_parent2 })
      | Bool
is_parent1 Bool -> Bool -> Bool
|| Bool
is_parent2
      , Bool -> Bool
not (GlobalRdrElt -> Bool
forall info. GlobalRdrEltX info -> Bool
isRecFldGRE GlobalRdrElt
gre1 Bool -> Bool -> Bool
|| GlobalRdrElt -> Bool
forall info. GlobalRdrEltX info -> Bool
isRecFldGRE GlobalRdrElt
gre2) -- NB: does not force GREInfo.
      , let name1 :: Name
name1 = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre1
            name2 :: Name
name2 = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre2
            gre :: GlobalRdrElt
gre = GlobalRdrElt
gre1 GlobalRdrElt -> GlobalRdrElt -> GlobalRdrElt
`plusGRE` GlobalRdrElt
gre2
              -- See Note [Preserve parent information when combining import OccEnvs]
      = Bool -> SDoc -> ImpOccItem -> ImpOccItem
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (Name
name1 Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
== Name
name2)
                  (Name -> SDoc
forall a. Outputable a => a -> SDoc
ppr Name
name1 SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> Name -> SDoc
forall a. Outputable a => a -> SDoc
ppr Name
name2) (ImpOccItem -> ImpOccItem) -> ImpOccItem -> ImpOccItem
forall a b. (a -> b) -> a -> b
$
        if Bool
is_parent1
        then ImpOccItem
item1 { imp_item = gre }
        else ImpOccItem
item2 { imp_item = gre }
      -- Discard C(C,T) in favour of T(T, T1, T2, T3).

    -- 'combine' may also be called for pattern synonyms which appear both
    -- unassociated and associated (see Note [Importing PatternSynonyms]).
    combine item1 :: ImpOccItem
item1@(ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
c1, imp_bundled :: ImpOccItem -> [GlobalRdrElt]
imp_bundled = [GlobalRdrElt]
kids1 })
            item2 :: ImpOccItem
item2@(ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
c2, imp_bundled :: ImpOccItem -> [GlobalRdrElt]
imp_bundled = [GlobalRdrElt]
kids2 })
      = Bool -> SDoc -> ImpOccItem -> ImpOccItem
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
c1 Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
== GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
c2
                   Bool -> Bool -> Bool
&& (Bool -> Bool
not ([GlobalRdrElt] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GlobalRdrElt]
kids1 Bool -> Bool -> Bool
&& [GlobalRdrElt] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GlobalRdrElt]
kids2)))
                  (GlobalRdrElt -> SDoc
forall a. Outputable a => a -> SDoc
ppr GlobalRdrElt
c1 SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> GlobalRdrElt -> SDoc
forall a. Outputable a => a -> SDoc
ppr GlobalRdrElt
c2 SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [GlobalRdrElt] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [GlobalRdrElt]
kids1 SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [GlobalRdrElt] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [GlobalRdrElt]
kids2) (ImpOccItem -> ImpOccItem) -> ImpOccItem -> ImpOccItem
forall a b. (a -> b) -> a -> b
$
        if [GlobalRdrElt] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GlobalRdrElt]
kids1
        then ImpOccItem
item2
        else ImpOccItem
item1
      -- Discard standalone pattern P in favour of T(P).

-- | Essentially like @lookupGRE env (LookupOccName occ which_gres)@,
-- but working with 'ImpOccItem's instead of 'GlobalRdrElt's.
lookupImpOccEnv :: WhichGREs GREInfo
                -> OccEnv (NameEnv ImpOccItem) -> OccName -> [NameEnv ImpOccItem]
lookupImpOccEnv :: WhichGREs GREInfo
-> OccEnv (NameEnv ImpOccItem) -> OccName -> [NameEnv ImpOccItem]
lookupImpOccEnv WhichGREs GREInfo
which_gres OccEnv (NameEnv ImpOccItem)
env OccName
occ =
  (NameEnv ImpOccItem -> Maybe (NameEnv ImpOccItem))
-> [NameEnv ImpOccItem] -> [NameEnv ImpOccItem]
forall a b. (a -> Maybe b) -> [a] -> [b]
mapMaybe NameEnv ImpOccItem -> Maybe (NameEnv ImpOccItem)
relevant_items ([NameEnv ImpOccItem] -> [NameEnv ImpOccItem])
-> [NameEnv ImpOccItem] -> [NameEnv ImpOccItem]
forall a b. (a -> b) -> a -> b
$ OccEnv (NameEnv ImpOccItem) -> OccName -> [NameEnv ImpOccItem]
forall a. OccEnv a -> OccName -> [a]
lookupOccEnv_AllNameSpaces OccEnv (NameEnv ImpOccItem)
env OccName
occ
  where
    is_relevant :: ImpOccItem -> Bool
    is_relevant :: ImpOccItem -> Bool
is_relevant (ImpOccItem { imp_item :: ImpOccItem -> GlobalRdrElt
imp_item = GlobalRdrElt
gre }) =
      WhichGREs GREInfo -> NameSpace -> GlobalRdrElt -> Bool
greIsRelevant WhichGREs GREInfo
which_gres (OccName -> NameSpace
occNameSpace OccName
occ) GlobalRdrElt
gre
    relevant_items :: NameEnv ImpOccItem -> Maybe (NameEnv ImpOccItem)
    relevant_items :: NameEnv ImpOccItem -> Maybe (NameEnv ImpOccItem)
relevant_items NameEnv ImpOccItem
nms
      | let nms' :: NameEnv ImpOccItem
nms' = (ImpOccItem -> Bool) -> NameEnv ImpOccItem -> NameEnv ImpOccItem
forall elt. (elt -> Bool) -> NameEnv elt -> NameEnv elt
filterNameEnv ImpOccItem -> Bool
is_relevant NameEnv ImpOccItem
nms
      = if NameEnv ImpOccItem -> Bool
forall a. NameEnv a -> Bool
isEmptyNameEnv NameEnv ImpOccItem
nms'
        then Maybe (NameEnv ImpOccItem)
forall a. Maybe a
Nothing
        else NameEnv ImpOccItem -> Maybe (NameEnv ImpOccItem)
forall a. a -> Maybe a
Just NameEnv ImpOccItem
nms'

{-
************************************************************************
*                                                                      *
\subsection{Import/Export Utils}
*                                                                      *
************************************************************************
-}

-- | Given an import\/export spec, appropriately set the @gre_imp@ field
-- for the 'GlobalRdrElt's.
gresFromIE :: ImpDeclSpec -> (LIE GhcRn, [GlobalRdrElt]) -> [GlobalRdrElt]
gresFromIE :: ImpDeclSpec -> (LIE GhcRn, [GlobalRdrElt]) -> [GlobalRdrElt]
gresFromIE ImpDeclSpec
decl_spec (L SrcSpanAnnA
loc IE GhcRn
ie, [GlobalRdrElt]
gres)
  = (GlobalRdrElt -> GlobalRdrElt) -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map GlobalRdrElt -> GlobalRdrElt
set_gre_imp [GlobalRdrElt]
gres
  where
    is_explicit :: Name -> Bool
is_explicit = case IE GhcRn
ie of
                    IEThingAll XIEThingAll GhcRn
_ LIEWrappedName GhcRn
name -> \Name
n -> Name
n Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
== LIEWrappedName GhcRn -> IdP GhcRn
forall (p :: Pass). LIEWrappedName (GhcPass p) -> IdP (GhcPass p)
lieWrappedName LIEWrappedName GhcRn
name
                    IE GhcRn
_                 -> \Name
_ -> Bool
True
    prov_fn :: Name -> ImportSpec
prov_fn Name
name
      = ImpSpec { is_decl :: ImpDeclSpec
is_decl = ImpDeclSpec
decl_spec, is_item :: ImpItemSpec
is_item = ImpItemSpec
item_spec }
      where
        item_spec :: ImpItemSpec
item_spec = ImpSome { is_explicit :: Bool
is_explicit = Name -> Bool
is_explicit Name
name
                            , is_iloc :: SrcSpan
is_iloc = SrcSpanAnnA -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc }
    set_gre_imp :: GlobalRdrElt -> GlobalRdrElt
set_gre_imp gre :: GlobalRdrElt
gre@( GRE { gre_name :: forall info. GlobalRdrEltX info -> Name
gre_name = Name
nm } )
      = GlobalRdrElt
gre { gre_imp = unitBag $ prov_fn nm }

{-
Note [Children for duplicate record fields]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Consider the module

    {-# LANGUAGE DuplicateRecordFields #-}
    module M (F(foo, MkFInt, MkFBool)) where
      data family F a
      data instance F Int = MkFInt { foo :: Int }
      data instance F Bool = MkFBool { foo :: Bool }

The `foo` in the export list refers to *both* selectors! For this
reason, lookupChildren builds an environment that maps the FastString
to a list of items, rather than a single item.
-}

mkChildEnv :: [GlobalRdrElt] -> NameEnv [GlobalRdrElt]
mkChildEnv :: [GlobalRdrElt] -> NameEnv [GlobalRdrElt]
mkChildEnv [GlobalRdrElt]
gres = (GlobalRdrElt -> NameEnv [GlobalRdrElt] -> NameEnv [GlobalRdrElt])
-> NameEnv [GlobalRdrElt]
-> [GlobalRdrElt]
-> NameEnv [GlobalRdrElt]
forall a b. (a -> b -> b) -> b -> [a] -> b
forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr GlobalRdrElt -> NameEnv [GlobalRdrElt] -> NameEnv [GlobalRdrElt]
forall {info}.
GlobalRdrEltX info
-> NameEnv [GlobalRdrEltX info] -> NameEnv [GlobalRdrEltX info]
add NameEnv [GlobalRdrElt]
forall a. NameEnv a
emptyNameEnv [GlobalRdrElt]
gres
  where
    add :: GlobalRdrEltX info
-> NameEnv [GlobalRdrEltX info] -> NameEnv [GlobalRdrEltX info]
add GlobalRdrEltX info
gre NameEnv [GlobalRdrEltX info]
env = case GlobalRdrEltX info -> Parent
forall info. GlobalRdrEltX info -> Parent
greParent GlobalRdrEltX info
gre of
        ParentIs  Name
p -> (GlobalRdrEltX info
 -> [GlobalRdrEltX info] -> [GlobalRdrEltX info])
-> (GlobalRdrEltX info -> [GlobalRdrEltX info])
-> NameEnv [GlobalRdrEltX info]
-> Name
-> GlobalRdrEltX info
-> NameEnv [GlobalRdrEltX info]
forall a b.
(a -> b -> b) -> (a -> b) -> NameEnv b -> Name -> a -> NameEnv b
extendNameEnv_Acc (:) GlobalRdrEltX info -> [GlobalRdrEltX info]
forall a. a -> [a]
Utils.singleton NameEnv [GlobalRdrEltX info]
env Name
p GlobalRdrEltX info
gre
        Parent
NoParent    -> NameEnv [GlobalRdrEltX info]
env

findChildren :: NameEnv [a] -> Name -> [a]
findChildren :: forall a. NameEnv [a] -> Name -> [a]
findChildren NameEnv [a]
env Name
n = NameEnv [a] -> Name -> Maybe [a]
forall a. NameEnv a -> Name -> Maybe a
lookupNameEnv NameEnv [a]
env Name
n Maybe [a] -> [a] -> [a]
forall a. Maybe a -> a -> a
`orElse` []

lookupChildren :: [GlobalRdrElt]
               -> [LIEWrappedName GhcPs]
               -> MaybeErr [LIEWrappedName GhcPs]   -- The ones for which the lookup failed
                           [LocatedA GlobalRdrElt]
-- (lookupChildren all_kids rdr_items) maps each rdr_item to its
-- corresponding Name all_kids, if the former exists
-- The matching is done by FastString, not OccName, so that
--    Cls( meth, AssocTy )
-- will correctly find AssocTy among the all_kids of Cls, even though
-- the RdrName for AssocTy may have a (bogus) DataName namespace
-- (Really the rdr_items should be FastStrings in the first place.)
lookupChildren :: [GlobalRdrElt]
-> [LIEWrappedName (GhcPass 'Parsed)]
-> MaybeErr
     [LIEWrappedName (GhcPass 'Parsed)] [LocatedA GlobalRdrElt]
lookupChildren [GlobalRdrElt]
all_kids [LIEWrappedName (GhcPass 'Parsed)]
rdr_items
  | [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
fails
  = [LocatedA GlobalRdrElt]
-> MaybeErr
     [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
     [LocatedA GlobalRdrElt]
forall err val. val -> MaybeErr err val
Succeeded ([[LocatedA GlobalRdrElt]] -> [LocatedA GlobalRdrElt]
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [[LocatedA GlobalRdrElt]]
oks)
       -- This 'fmap concat' trickily applies concat to the /second/ component
       -- of the pair, whose type is ([LocatedA Name], [[Located FieldLabel]])
  | Bool
otherwise
  = [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
-> MaybeErr
     [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
     [LocatedA GlobalRdrElt]
forall err val. err -> MaybeErr err val
Failed [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
fails
  where
    mb_xs :: [MaybeErr
   (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
   [LocatedA GlobalRdrElt]]
mb_xs = (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
 -> MaybeErr
      (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
      [LocatedA GlobalRdrElt])
-> [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
-> [MaybeErr
      (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
      [LocatedA GlobalRdrElt]]
forall a b. (a -> b) -> [a] -> [b]
map GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
-> MaybeErr
     (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
     [LocatedA GlobalRdrElt]
doOne [LIEWrappedName (GhcPass 'Parsed)]
[GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
rdr_items
    fails :: [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
fails = [ GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
bad_rdr | Failed GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
bad_rdr <- [MaybeErr
   (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
   [LocatedA GlobalRdrElt]]
mb_xs ]
    oks :: [[LocatedA GlobalRdrElt]]
oks   = [ [LocatedA GlobalRdrElt]
ok      | Succeeded [LocatedA GlobalRdrElt]
ok   <- [MaybeErr
   (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
   [LocatedA GlobalRdrElt]]
mb_xs ]
    oks :: [[LocatedA GlobalRdrElt]]

    doOne :: GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
-> MaybeErr
     (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
     [LocatedA GlobalRdrElt]
doOne item :: GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
item@(L SrcSpanAnnA
l IEWrappedName (GhcPass 'Parsed)
r)
       = case (FastStringEnv [GlobalRdrElt] -> FastString -> Maybe [GlobalRdrElt]
forall a. FastStringEnv a -> FastString -> Maybe a
lookupFsEnv FastStringEnv [GlobalRdrElt]
kid_env (FastString -> Maybe [GlobalRdrElt])
-> (IEWrappedName (GhcPass 'Parsed) -> FastString)
-> IEWrappedName (GhcPass 'Parsed)
-> Maybe [GlobalRdrElt]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. OccName -> FastString
occNameFS (OccName -> FastString)
-> (IEWrappedName (GhcPass 'Parsed) -> OccName)
-> IEWrappedName (GhcPass 'Parsed)
-> FastString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. RdrName -> OccName
rdrNameOcc (RdrName -> OccName)
-> (IEWrappedName (GhcPass 'Parsed) -> RdrName)
-> IEWrappedName (GhcPass 'Parsed)
-> OccName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. IEWrappedName (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
IEWrappedName (GhcPass 'Parsed) -> RdrName
forall (p :: Pass). IEWrappedName (GhcPass p) -> IdP (GhcPass p)
ieWrappedName) IEWrappedName (GhcPass 'Parsed)
r of
           Just [GlobalRdrElt
g]
             | Bool -> Bool
not (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$ GlobalRdrElt -> Bool
forall info. GlobalRdrEltX info -> Bool
isRecFldGRE GlobalRdrElt
g
             -> [LocatedA GlobalRdrElt]
-> MaybeErr
     (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
     [LocatedA GlobalRdrElt]
forall err val. val -> MaybeErr err val
Succeeded [SrcSpanAnnA -> GlobalRdrElt -> LocatedA GlobalRdrElt
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l GlobalRdrElt
g]
           Just [GlobalRdrElt]
gs
             | (GlobalRdrElt -> Bool) -> [GlobalRdrElt] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all GlobalRdrElt -> Bool
forall info. GlobalRdrEltX info -> Bool
isRecFldGRE [GlobalRdrElt]
gs
             -> [LocatedA GlobalRdrElt]
-> MaybeErr
     (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
     [LocatedA GlobalRdrElt]
forall err val. val -> MaybeErr err val
Succeeded ([LocatedA GlobalRdrElt]
 -> MaybeErr
      (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
      [LocatedA GlobalRdrElt])
-> [LocatedA GlobalRdrElt]
-> MaybeErr
     (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
     [LocatedA GlobalRdrElt]
forall a b. (a -> b) -> a -> b
$ (GlobalRdrElt -> LocatedA GlobalRdrElt)
-> [GlobalRdrElt] -> [LocatedA GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map (SrcSpanAnnA -> GlobalRdrElt -> LocatedA GlobalRdrElt
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l) [GlobalRdrElt]
gs
           Maybe [GlobalRdrElt]
_ -> GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
-> MaybeErr
     (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed)))
     [LocatedA GlobalRdrElt]
forall err val. err -> MaybeErr err val
Failed    GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
item

    -- See Note [Children for duplicate record fields]
    kid_env :: FastStringEnv [GlobalRdrElt]
kid_env = ([GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt])
-> FastStringEnv [GlobalRdrElt]
-> [(FastString, [GlobalRdrElt])]
-> FastStringEnv [GlobalRdrElt]
forall a.
(a -> a -> a)
-> FastStringEnv a -> [(FastString, a)] -> FastStringEnv a
extendFsEnvList_C [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. [a] -> [a] -> [a]
(++) FastStringEnv [GlobalRdrElt]
forall a. FastStringEnv a
emptyFsEnv
              [(OccName -> FastString
occNameFS (GlobalRdrElt -> OccName
forall name. HasOccName name => name -> OccName
occName GlobalRdrElt
x), [GlobalRdrElt
x]) | GlobalRdrElt
x <- [GlobalRdrElt]
all_kids]


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

{-
*********************************************************
*                                                       *
\subsection{Unused names}
*                                                       *
*********************************************************
-}

reportUnusedNames :: TcGblEnv -> HscSource -> RnM ()
reportUnusedNames :: TcGblEnv -> HscSource -> IOEnv (Env TcGblEnv TcLclEnv) ()
reportUnusedNames TcGblEnv
gbl_env HscSource
hsc_src
  = do  { Defs
keep <- TcRef Defs -> IOEnv (Env TcGblEnv TcLclEnv) Defs
forall (m :: * -> *) a. MonadIO m => TcRef a -> m a
readTcRef (TcGblEnv -> TcRef Defs
tcg_keep TcGblEnv
gbl_env)
        ; String -> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
traceRn String
"RUN" (DefUses -> SDoc
forall a. Outputable a => a -> SDoc
ppr (TcGblEnv -> DefUses
tcg_dus TcGblEnv
gbl_env))
        ; TcGblEnv -> HscSource -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnUnusedImportDecls TcGblEnv
gbl_env HscSource
hsc_src
        ; [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnUnusedTopBinds ([GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [GlobalRdrElt] -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$ Defs -> [GlobalRdrElt]
unused_locals Defs
keep
        ; TcGblEnv -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnMissingSignatures TcGblEnv
gbl_env
        ; TcGblEnv -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnMissingKindSignatures TcGblEnv
gbl_env }
  where
    used_names :: NameSet -> NameSet
    used_names :: Defs -> Defs
used_names Defs
keep = DefUses -> Defs -> Defs
findUses (TcGblEnv -> DefUses
tcg_dus TcGblEnv
gbl_env) Defs
emptyNameSet Defs -> Defs -> Defs
`unionNameSet` Defs
keep
    -- NB: currently, if f x = g, we only treat 'g' as used if 'f' is used
    -- Hence findUses

    -- Collect the defined names from the in-scope environment
    defined_names :: [GlobalRdrElt]
    defined_names :: [GlobalRdrElt]
defined_names = GlobalRdrEnv -> [GlobalRdrElt]
forall info. GlobalRdrEnvX info -> [GlobalRdrEltX info]
globalRdrEnvElts (TcGblEnv -> GlobalRdrEnv
tcg_rdr_env TcGblEnv
gbl_env)

    kids_env :: NameEnv [GlobalRdrElt]
kids_env = [GlobalRdrElt] -> NameEnv [GlobalRdrElt]
mkChildEnv [GlobalRdrElt]
defined_names
    -- This is done in mkExports too; duplicated work

    gre_is_used :: NameSet -> GlobalRdrElt -> Bool
    gre_is_used :: Defs -> GlobalRdrElt -> Bool
gre_is_used Defs
used_names GlobalRdrElt
gre0
        = Name
name Name -> Defs -> Bool
`elemNameSet` Defs
used_names
          Bool -> Bool -> Bool
|| (GlobalRdrElt -> Bool) -> [GlobalRdrElt] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
any (\ GlobalRdrElt
gre -> GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre Name -> Defs -> Bool
`elemNameSet` Defs
used_names) (NameEnv [GlobalRdrElt] -> Name -> [GlobalRdrElt]
forall a. NameEnv [a] -> Name -> [a]
findChildren NameEnv [GlobalRdrElt]
kids_env Name
name)
                -- A use of C implies a use of T,
                -- if C was brought into scope by T(..) or T(C)
      where
        name :: Name
name = GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre0

    -- Filter out the ones that are
    --  (a) defined in this module, and
    --  (b) not defined by a 'deriving' clause
    -- The latter have an Internal Name, so we can filter them out easily
    unused_locals :: NameSet -> [GlobalRdrElt]
    unused_locals :: Defs -> [GlobalRdrElt]
unused_locals Defs
keep =
      let -- Note that defined_and_used, defined_but_not_used
          -- are both [GRE]; that's why we need defined_and_used
          -- rather than just used_names
          _defined_and_used, defined_but_not_used :: [GlobalRdrElt]
          ([GlobalRdrElt]
_defined_and_used, [GlobalRdrElt]
defined_but_not_used)
              = (GlobalRdrElt -> Bool)
-> [GlobalRdrElt] -> ([GlobalRdrElt], [GlobalRdrElt])
forall a. (a -> Bool) -> [a] -> ([a], [a])
partition (Defs -> GlobalRdrElt -> Bool
gre_is_used (Defs -> Defs
used_names Defs
keep)) [GlobalRdrElt]
defined_names

      in (GlobalRdrElt -> Bool) -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. (a -> Bool) -> [a] -> [a]
filter GlobalRdrElt -> Bool
is_unused_local [GlobalRdrElt]
defined_but_not_used
    is_unused_local :: GlobalRdrElt -> Bool
    is_unused_local :: GlobalRdrElt -> Bool
is_unused_local GlobalRdrElt
gre = GlobalRdrElt -> Bool
forall info. GlobalRdrEltX info -> Bool
isLocalGRE GlobalRdrElt
gre
                       Bool -> Bool -> Bool
&& Name -> Bool
isExternalName (GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre)

{- *********************************************************************
*                                                                      *
              Missing signatures
*                                                                      *
********************************************************************* -}

{-
Note [Missing signatures]
~~~~~~~~~~~~~~~~~~~~~~~~~
There are four warning flags in play:

  * -Wmissing-exported-signatures
    Warn about any exported top-level function/value without a type signature.
    Does not include pattern synonyms.

  * -Wmissing-signatures
    Warn about any top-level function/value without a type signature. Does not
    include pattern synonyms. Takes priority over -Wmissing-exported-signatures.

  * -Wmissing-exported-pattern-synonym-signatures
    Warn about any exported pattern synonym without a type signature.

  * -Wmissing-pattern-synonym-signatures
    Warn about any pattern synonym without a type signature. Takes priority over
    -Wmissing-exported-pattern-synonym-signatures.

-}

-- | Warn the user about top level binders that lack type signatures.
-- Called /after/ type inference, so that we can report the
-- inferred type of the function
warnMissingSignatures :: TcGblEnv -> RnM ()
warnMissingSignatures :: TcGblEnv -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnMissingSignatures TcGblEnv
gbl_env
  = do { let exports :: Defs
exports = [AvailInfo] -> Defs
availsToNameSet (TcGblEnv -> [AvailInfo]
tcg_exports TcGblEnv
gbl_env)
             sig_ns :: Defs
sig_ns  = TcGblEnv -> Defs
tcg_sigs TcGblEnv
gbl_env
               -- We use sig_ns to exclude top-level bindings that are generated by GHC
             binds :: [IdP GhcTc]
binds    = CollectFlag GhcTc -> LHsBindsLR GhcTc GhcTc -> [IdP GhcTc]
forall p idR.
CollectPass p =>
CollectFlag p -> LHsBindsLR p idR -> [IdP p]
collectHsBindsBinders CollectFlag GhcTc
forall p. CollectFlag p
CollNoDictBinders (LHsBindsLR GhcTc GhcTc -> [IdP GhcTc])
-> LHsBindsLR GhcTc GhcTc -> [IdP GhcTc]
forall a b. (a -> b) -> a -> b
$ TcGblEnv -> LHsBindsLR GhcTc GhcTc
tcg_binds TcGblEnv
gbl_env
             pat_syns :: [PatSyn]
pat_syns = TcGblEnv -> [PatSyn]
tcg_patsyns TcGblEnv
gbl_env

             not_ghc_generated :: Name -> Bool
             not_ghc_generated :: Name -> Bool
not_ghc_generated Name
name = Name
name Name -> Defs -> Bool
`elemNameSet` Defs
sig_ns

             add_binding_warn :: Id -> RnM ()
             add_binding_warn :: Id -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_binding_warn Id
id =
               Bool
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Name -> Bool
not_ghc_generated Name
name) (IOEnv (Env TcGblEnv TcLclEnv) ()
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$
               do { TidyEnv
env <- ZonkM TidyEnv -> TcM TidyEnv
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM TidyEnv -> TcM TidyEnv) -> ZonkM TidyEnv -> TcM TidyEnv
forall a b. (a -> b) -> a -> b
$ ZonkM TidyEnv
tcInitTidyEnv -- Why not use emptyTidyEnv?
                  ; let (TidyEnv
_, Type
ty) = TidyEnv -> Type -> (TidyEnv, Type)
tidyOpenType TidyEnv
env (Id -> Type
idType Id
id)
                        missing :: MissingSignature
missing = Name -> Type -> MissingSignature
MissingTopLevelBindingSig Name
name Type
ty
                        diag :: TcRnMessage
diag = MissingSignature -> Exported -> TcRnMessage
TcRnMissingSignature MissingSignature
missing Exported
exported
                  ; SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnosticAt (Name -> SrcSpan
forall a. NamedThing a => a -> SrcSpan
getSrcSpan Name
name) TcRnMessage
diag }
               where
                 name :: Name
name = Id -> Name
idName Id
id
                 exported :: Exported
exported = if Name
name Name -> Defs -> Bool
`elemNameSet` Defs
exports
                            then Exported
IsExported
                            else Exported
IsNotExported

             add_patsyn_warn :: PatSyn -> RnM ()
             add_patsyn_warn :: PatSyn -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_patsyn_warn PatSyn
ps =
               Bool
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Name -> Bool
not_ghc_generated Name
name) (IOEnv (Env TcGblEnv TcLclEnv) ()
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$
                 SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnosticAt (Name -> SrcSpan
forall a. NamedThing a => a -> SrcSpan
getSrcSpan Name
name)
                  (MissingSignature -> Exported -> TcRnMessage
TcRnMissingSignature MissingSignature
missing Exported
exported)
               where
                 name :: Name
name = PatSyn -> Name
patSynName PatSyn
ps
                 missing :: MissingSignature
missing = PatSyn -> MissingSignature
MissingPatSynSig PatSyn
ps
                 exported :: Exported
exported = if Name
name Name -> Defs -> Bool
`elemNameSet` Defs
exports
                            then Exported
IsExported
                            else Exported
IsNotExported

         -- Warn about missing signatures
         -- Do this only when we have a type to offer
         -- See Note [Missing signatures]
       ; (Id -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [Id] -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ Id -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_binding_warn [IdP GhcTc]
[Id]
binds
       ; (PatSyn -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [PatSyn] -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ PatSyn -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_patsyn_warn  [PatSyn]
pat_syns
       }

-- | Warn the user about tycons that lack kind signatures.
-- Called /after/ type (and kind) inference, so that we can report the
-- inferred kinds.
warnMissingKindSignatures :: TcGblEnv -> RnM ()
warnMissingKindSignatures :: TcGblEnv -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnMissingKindSignatures TcGblEnv
gbl_env
  = do { Bool
cusks_enabled <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
xoptM Extension
LangExt.CUSKs
       ; (TyCon -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [TyCon] -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (Bool -> TyCon -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_ty_warn Bool
cusks_enabled) [TyCon]
tcs
       }
  where
    tcs :: [TyCon]
tcs = TcGblEnv -> [TyCon]
tcg_tcs TcGblEnv
gbl_env
    ksig_ns :: Defs
ksig_ns = TcGblEnv -> Defs
tcg_ksigs TcGblEnv
gbl_env
    exports :: Defs
exports = [AvailInfo] -> Defs
availsToNameSet (TcGblEnv -> [AvailInfo]
tcg_exports TcGblEnv
gbl_env)

    has_kind_signature :: Name -> Bool
    has_kind_signature :: Name -> Bool
has_kind_signature Name
name = Name
name Name -> Defs -> Bool
`elemNameSet` Defs
ksig_ns

    add_ty_warn :: Bool -> TyCon -> RnM ()
    add_ty_warn :: Bool -> TyCon -> IOEnv (Env TcGblEnv TcLclEnv) ()
add_ty_warn Bool
cusks_enabled TyCon
tyCon =
      Bool
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Name -> Bool
has_kind_signature Name
name) (IOEnv (Env TcGblEnv TcLclEnv) ()
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$
        SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnosticAt (Name -> SrcSpan
forall a. NamedThing a => a -> SrcSpan
getSrcSpan Name
name) TcRnMessage
diag
      where
        name :: Name
name = TyCon -> Name
tyConName TyCon
tyCon
        diag :: TcRnMessage
diag = MissingSignature -> Exported -> TcRnMessage
TcRnMissingSignature MissingSignature
missing Exported
exported
        missing :: MissingSignature
missing = TyCon -> Bool -> MissingSignature
MissingTyConKindSig TyCon
tyCon Bool
cusks_enabled
        exported :: Exported
exported = if Name
name Name -> Defs -> Bool
`elemNameSet` Defs
exports
                   then Exported
IsExported
                   else Exported
IsNotExported

{-
*********************************************************
*                                                       *
\subsection{Unused imports}
*                                                       *
*********************************************************

This code finds which import declarations are unused.  The
specification and implementation notes are here:
  https://gitlab.haskell.org/ghc/ghc/wikis/commentary/compiler/unused-imports

See also Note [Choosing the best import declaration] in GHC.Types.Name.Reader
-}

type ImportDeclUsage
   = ( LImportDecl GhcRn   -- The import declaration
     , [GlobalRdrElt]      -- What *is* used (normalised)
     , [Name] )            -- What is imported but *not* used

warnUnusedImportDecls :: TcGblEnv -> HscSource -> RnM ()
warnUnusedImportDecls :: TcGblEnv -> HscSource -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnUnusedImportDecls TcGblEnv
gbl_env HscSource
hsc_src
  = do { [GlobalRdrElt]
uses <- IORef [GlobalRdrElt]
-> IOEnv (Env TcGblEnv TcLclEnv) [GlobalRdrElt]
forall a env. IORef a -> IOEnv env a
readMutVar (TcGblEnv -> IORef [GlobalRdrElt]
tcg_used_gres TcGblEnv
gbl_env)
       ; let user_imports :: [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
user_imports = (GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> Bool)
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
forall a. (a -> Bool) -> [a] -> [a]
filterOut
                              (XImportDeclPass -> Bool
ideclImplicit (XImportDeclPass -> Bool)
-> (GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> XImportDeclPass)
-> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
-> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ImportDecl GhcRn -> XCImportDecl GhcRn
ImportDecl GhcRn -> XImportDeclPass
forall pass. ImportDecl pass -> XCImportDecl pass
ideclExt (ImportDecl GhcRn -> XImportDeclPass)
-> (GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> ImportDecl GhcRn)
-> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
-> XImportDeclPass
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> ImportDecl GhcRn
forall l e. GenLocated l e -> e
unLoc)
                              (TcGblEnv -> [LImportDecl GhcRn]
tcg_rn_imports TcGblEnv
gbl_env)
                -- This whole function deals only with *user* imports
                -- both for warning about unnecessary ones, and for
                -- deciding the minimal ones
             rdr_env :: GlobalRdrEnv
rdr_env = TcGblEnv -> GlobalRdrEnv
tcg_rdr_env TcGblEnv
gbl_env

       ; let usage :: [ImportDeclUsage]
             usage :: [ImportDeclUsage]
usage = [LImportDecl GhcRn] -> [GlobalRdrElt] -> [ImportDeclUsage]
findImportUsage [LImportDecl GhcRn]
[GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
user_imports [GlobalRdrElt]
uses

       ; String -> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
traceRn String
"warnUnusedImportDecls" (SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> SDoc -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$
                       ([SDoc] -> SDoc
forall doc. IsDoc doc => [doc] -> doc
vcat [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"Uses:" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [GlobalRdrElt] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [GlobalRdrElt]
uses
                             , String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"Import usage" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
  [Name])]
-> SDoc
forall a. Outputable a => a -> SDoc
ppr [ImportDeclUsage]
[(GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
  [Name])]
usage])

       ; ((GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
  [Name])
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
     [Name])]
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (GlobalRdrEnv -> ImportDeclUsage -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnUnusedImport GlobalRdrEnv
rdr_env) [ImportDeclUsage]
[(GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
  [Name])]
usage

       ; GeneralFlag
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall gbl lcl.
GeneralFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
whenGOptM GeneralFlag
Opt_D_dump_minimal_imports (IOEnv (Env TcGblEnv TcLclEnv) ()
 -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IOEnv (Env TcGblEnv TcLclEnv) ()
-> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$
         HscSource -> [ImportDeclUsage] -> IOEnv (Env TcGblEnv TcLclEnv) ()
printMinimalImports HscSource
hsc_src [ImportDeclUsage]
usage }

findImportUsage :: [LImportDecl GhcRn]
                -> [GlobalRdrElt]
                -> [ImportDeclUsage]

findImportUsage :: [LImportDecl GhcRn] -> [GlobalRdrElt] -> [ImportDeclUsage]
findImportUsage [LImportDecl GhcRn]
imports [GlobalRdrElt]
used_gres
  = (GenLocated SrcSpanAnnA (ImportDecl GhcRn)
 -> (GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
     [Name]))
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
     [Name])]
forall a b. (a -> b) -> [a] -> [b]
map LImportDecl GhcRn -> ImportDeclUsage
GenLocated SrcSpanAnnA (ImportDecl GhcRn)
-> (GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
    [Name])
unused_decl [LImportDecl GhcRn]
[GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
imports
  where
    import_usage :: ImportMap
    import_usage :: ImportMap
import_usage = [GlobalRdrElt] -> ImportMap
mkImportMap [GlobalRdrElt]
used_gres

    unused_decl :: LImportDecl GhcRn -> (LImportDecl GhcRn, [GlobalRdrElt], [Name])
    unused_decl :: LImportDecl GhcRn -> ImportDeclUsage
unused_decl decl :: LImportDecl GhcRn
decl@(L SrcSpanAnnA
loc (ImportDecl { ideclImportList :: forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList = Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
imps }))
      = (LImportDecl GhcRn
decl, [GlobalRdrElt]
used_gres, Defs -> [Name]
nameSetElemsStable Defs
unused_imps)
      where
        used_gres :: [GlobalRdrElt]
used_gres = SrcLoc -> ImportMap -> Maybe [GlobalRdrElt]
forall a. SrcLoc -> Map RealSrcLoc a -> Maybe a
lookupSrcLoc (SrcSpan -> SrcLoc
srcSpanEnd (SrcSpan -> SrcLoc) -> SrcSpan -> SrcLoc
forall a b. (a -> b) -> a -> b
$ SrcSpanAnnA -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc) ImportMap
import_usage
                               -- srcSpanEnd: see Note [The ImportMap]
                    Maybe [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. Maybe a -> a -> a
`orElse` []

        used_names :: Defs
used_names   = [Name] -> Defs
mkNameSet ((GlobalRdrElt -> Name) -> [GlobalRdrElt] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map      GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName        [GlobalRdrElt]
used_gres)
        used_parents :: Defs
used_parents = [Name] -> Defs
mkNameSet ((GlobalRdrElt -> Maybe Name) -> [GlobalRdrElt] -> [Name]
forall a b. (a -> Maybe b) -> [a] -> [b]
mapMaybe GlobalRdrElt -> Maybe Name
forall info. GlobalRdrEltX info -> Maybe Name
greParent_maybe [GlobalRdrElt]
used_gres)

        unused_imps :: Defs
unused_imps   -- Not trivial; see eg #7454
          = case Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
imps of
              Just (ImportListInterpretation
Exactly, L SrcSpanAnnL
_ [GenLocated SrcSpanAnnA (IE GhcRn)]
imp_ies) ->
                                 (GenLocated SrcSpanAnnA (IE GhcRn) -> Defs -> Defs)
-> Defs -> [GenLocated SrcSpanAnnA (IE GhcRn)] -> Defs
forall a b. (a -> b -> b) -> b -> [a] -> b
forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr (IE GhcRn -> Defs -> Defs
add_unused (IE GhcRn -> Defs -> Defs)
-> (GenLocated SrcSpanAnnA (IE GhcRn) -> IE GhcRn)
-> GenLocated SrcSpanAnnA (IE GhcRn)
-> Defs
-> Defs
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GenLocated SrcSpanAnnA (IE GhcRn) -> IE GhcRn
forall l e. GenLocated l e -> e
unLoc) Defs
emptyNameSet [GenLocated SrcSpanAnnA (IE GhcRn)]
imp_ies
              Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
_other -> Defs
emptyNameSet -- No explicit import list => no unused-name list

        add_unused :: IE GhcRn -> NameSet -> NameSet
        add_unused :: IE GhcRn -> Defs -> Defs
add_unused (IEVar XIEVar GhcRn
_ LIEWrappedName GhcRn
n)      Defs
acc = Name -> Defs -> Defs
add_unused_name (LIEWrappedName GhcRn -> IdP GhcRn
forall (p :: Pass). LIEWrappedName (GhcPass p) -> IdP (GhcPass p)
lieWrappedName LIEWrappedName GhcRn
n) Defs
acc
        add_unused (IEThingAbs XIEThingAbs GhcRn
_ LIEWrappedName GhcRn
n) Defs
acc = Name -> Defs -> Defs
add_unused_name (LIEWrappedName GhcRn -> IdP GhcRn
forall (p :: Pass). LIEWrappedName (GhcPass p) -> IdP (GhcPass p)
lieWrappedName LIEWrappedName GhcRn
n) Defs
acc
        add_unused (IEThingAll XIEThingAll GhcRn
_ LIEWrappedName GhcRn
n) Defs
acc = Name -> Defs -> Defs
add_unused_all  (LIEWrappedName GhcRn -> IdP GhcRn
forall (p :: Pass). LIEWrappedName (GhcPass p) -> IdP (GhcPass p)
lieWrappedName LIEWrappedName GhcRn
n) Defs
acc
        add_unused (IEThingWith XIEThingWith GhcRn
_ LIEWrappedName GhcRn
p IEWildcard
wc [LIEWrappedName GhcRn]
ns) Defs
acc =
          Defs -> Defs
add_wc_all (Name -> [Name] -> Defs -> Defs
add_unused_with IdP GhcRn
Name
pn [Name]
xs Defs
acc)
          where pn :: IdP GhcRn
pn = LIEWrappedName GhcRn -> IdP GhcRn
forall (p :: Pass). LIEWrappedName (GhcPass p) -> IdP (GhcPass p)
lieWrappedName LIEWrappedName GhcRn
p
                xs :: [Name]
xs = (GenLocated SrcSpanAnnA (IEWrappedName GhcRn) -> Name)
-> [GenLocated SrcSpanAnnA (IEWrappedName GhcRn)] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map LIEWrappedName GhcRn -> IdP GhcRn
GenLocated SrcSpanAnnA (IEWrappedName GhcRn) -> Name
forall (p :: Pass). LIEWrappedName (GhcPass p) -> IdP (GhcPass p)
lieWrappedName [LIEWrappedName GhcRn]
[GenLocated SrcSpanAnnA (IEWrappedName GhcRn)]
ns
                add_wc_all :: Defs -> Defs
add_wc_all = case IEWildcard
wc of
                            IEWildcard
NoIEWildcard -> Defs -> Defs
forall a. a -> a
id
                            IEWildcard Int
_ -> Name -> Defs -> Defs
add_unused_all IdP GhcRn
Name
pn
        add_unused IE GhcRn
_ Defs
acc = Defs
acc

        add_unused_name :: Name -> Defs -> Defs
add_unused_name Name
n Defs
acc
          | Name
n Name -> Defs -> Bool
`elemNameSet` Defs
used_names = Defs
acc
          | Bool
otherwise                  = Defs
acc Defs -> Name -> Defs
`extendNameSet` Name
n
        add_unused_all :: Name -> Defs -> Defs
add_unused_all Name
n Defs
acc
          | Name
n Name -> Defs -> Bool
`elemNameSet` Defs
used_names   = Defs
acc
          | Name
n Name -> Defs -> Bool
`elemNameSet` Defs
used_parents = Defs
acc
          | Bool
otherwise                    = Defs
acc Defs -> Name -> Defs
`extendNameSet` Name
n
        add_unused_with :: Name -> [Name] -> Defs -> Defs
add_unused_with Name
p [Name]
ns Defs
acc
          | (Name -> Bool) -> [Name] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all (Name -> Defs -> Bool
`elemNameSet` Defs
acc1) [Name]
ns = Name -> Defs -> Defs
add_unused_name Name
p Defs
acc1
          | Bool
otherwise = Defs
acc1
          where
            acc1 :: Defs
acc1 = (Name -> Defs -> Defs) -> Defs -> [Name] -> Defs
forall a b. (a -> b -> b) -> b -> [a] -> b
forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr Name -> Defs -> Defs
add_unused_name Defs
acc [Name]
ns
       -- If you use 'signum' from Num, then the user may well have
       -- imported Num(signum).  We don't want to complain that
       -- Num is not itself mentioned.  Hence the two cases in add_unused_with.


{- Note [The ImportMap]
~~~~~~~~~~~~~~~~~~~~~~~
The ImportMap is a short-lived intermediate data structure records, for
each import declaration, what stuff brought into scope by that
declaration is actually used in the module.

The SrcLoc is the location of the END of a particular 'import'
declaration.  Why *END*?  Because we don't want to get confused
by the implicit Prelude import. Consider (#7476) the module
    import Foo( foo )
    main = print foo
There is an implicit 'import Prelude(print)', and it gets a SrcSpan
of line 1:1 (just the point, not a span). If we use the *START* of
the SrcSpan to identify the import decl, we'll confuse the implicit
import Prelude with the explicit 'import Foo'.  So we use the END.
It's just a cheap hack; we could equally well use the Span too.

The [GlobalRdrElt] are the things imported from that decl.
-}

type ImportMap = Map RealSrcLoc [GlobalRdrElt]  -- See [The ImportMap]
     -- If loc :-> gres, then
     --   'loc' = the end loc of the bestImport of each GRE in 'gres'

mkImportMap :: [GlobalRdrElt] -> ImportMap
-- For each of a list of used GREs, find all the import decls that brought
-- it into scope; choose one of them (bestImport), and record
-- the RdrName in that import decl's entry in the ImportMap
mkImportMap :: [GlobalRdrElt] -> ImportMap
mkImportMap [GlobalRdrElt]
gres
  = (GlobalRdrElt -> ImportMap -> ImportMap)
-> ImportMap -> [GlobalRdrElt] -> ImportMap
forall a b. (a -> b -> b) -> b -> [a] -> b
forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr GlobalRdrElt -> ImportMap -> ImportMap
forall {info}.
Outputable info =>
GlobalRdrEltX info
-> Map RealSrcLoc [GlobalRdrEltX info]
-> Map RealSrcLoc [GlobalRdrEltX info]
add_one ImportMap
forall k a. Map k a
Map.empty [GlobalRdrElt]
gres
  where
    add_one :: GlobalRdrEltX info
-> Map RealSrcLoc [GlobalRdrEltX info]
-> Map RealSrcLoc [GlobalRdrEltX info]
add_one gre :: GlobalRdrEltX info
gre@(GRE { gre_imp :: forall info. GlobalRdrEltX info -> Bag ImportSpec
gre_imp = Bag ImportSpec
imp_specs }) Map RealSrcLoc [GlobalRdrEltX info]
imp_map =
      case SrcSpan -> SrcLoc
srcSpanEnd (ImpDeclSpec -> SrcSpan
is_dloc (ImportSpec -> ImpDeclSpec
is_decl ImportSpec
best_imp_spec)) of
                              -- For srcSpanEnd see Note [The ImportMap]
       RealSrcLoc RealSrcLoc
decl_loc Maybe BufPos
_ -> ([GlobalRdrEltX info]
 -> [GlobalRdrEltX info] -> [GlobalRdrEltX info])
-> RealSrcLoc
-> [GlobalRdrEltX info]
-> Map RealSrcLoc [GlobalRdrEltX info]
-> Map RealSrcLoc [GlobalRdrEltX info]
forall k a. Ord k => (a -> a -> a) -> k -> a -> Map k a -> Map k a
Map.insertWith [GlobalRdrEltX info]
-> [GlobalRdrEltX info] -> [GlobalRdrEltX info]
add RealSrcLoc
decl_loc [GlobalRdrEltX info
gre] Map RealSrcLoc [GlobalRdrEltX info]
imp_map
       UnhelpfulLoc FastString
_ -> Map RealSrcLoc [GlobalRdrEltX info]
imp_map
       where
          best_imp_spec :: ImportSpec
best_imp_spec =
            case Bag ImportSpec -> [ImportSpec]
forall a. Bag a -> [a]
bagToList Bag ImportSpec
imp_specs of
              []     -> String -> SDoc -> ImportSpec
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"mkImportMap: GRE with no ImportSpecs" (GlobalRdrEltX info -> SDoc
forall a. Outputable a => a -> SDoc
ppr GlobalRdrEltX info
gre)
              ImportSpec
is:[ImportSpec]
iss -> NonEmpty ImportSpec -> ImportSpec
bestImport (ImportSpec
is ImportSpec -> [ImportSpec] -> NonEmpty ImportSpec
forall a. a -> [a] -> NonEmpty a
NE.:| [ImportSpec]
iss)
          add :: [GlobalRdrEltX info]
-> [GlobalRdrEltX info] -> [GlobalRdrEltX info]
add [GlobalRdrEltX info]
_ [GlobalRdrEltX info]
gres = GlobalRdrEltX info
gre GlobalRdrEltX info -> [GlobalRdrEltX info] -> [GlobalRdrEltX info]
forall a. a -> [a] -> [a]
: [GlobalRdrEltX info]
gres

warnUnusedImport :: GlobalRdrEnv -> ImportDeclUsage -> RnM ()
warnUnusedImport :: GlobalRdrEnv -> ImportDeclUsage -> IOEnv (Env TcGblEnv TcLclEnv) ()
warnUnusedImport GlobalRdrEnv
rdr_env (L SrcSpanAnnA
loc ImportDecl GhcRn
decl, [GlobalRdrElt]
used, [Name]
unused)

  -- Do not warn for 'import M()'
  | Just (ImportListInterpretation
Exactly, L SrcSpanAnnL
_ []) <- ImportDecl GhcRn
-> Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList ImportDecl GhcRn
decl
  = () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()

  -- Note [Do not warn about Prelude hiding]
  | Just (ImportListInterpretation
EverythingBut, L SrcSpanAnnL
_ [GenLocated SrcSpanAnnA (IE GhcRn)]
hides) <- ImportDecl GhcRn
-> Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList ImportDecl GhcRn
decl
  , Bool -> Bool
not ([GenLocated SrcSpanAnnA (IE GhcRn)] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GenLocated SrcSpanAnnA (IE GhcRn)]
hides)
  , ModuleName
pRELUDE_NAME ModuleName -> ModuleName -> Bool
forall a. Eq a => a -> a -> Bool
== GenLocated SrcSpanAnnA ModuleName -> ModuleName
forall l e. GenLocated l e -> e
unLoc (ImportDecl GhcRn -> XRec GhcRn ModuleName
forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName ImportDecl GhcRn
decl)
  = () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()

  -- Nothing used; drop entire declaration
  | [GlobalRdrElt] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [GlobalRdrElt]
used
  = SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnosticAt (SrcSpanAnnA -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc) (ImportDecl GhcRn -> UnusedImportReason -> TcRnMessage
TcRnUnusedImport ImportDecl GhcRn
decl UnusedImportReason
UnusedImportNone)

  -- Everything imported is used; nop
  | [Name] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [Name]
unused
  = () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()

  -- Only one import is unused, with `SrcSpan` covering only the unused item instead of
  -- the whole import statement
  | Just (ImportListInterpretation
_, L SrcSpanAnnL
_ [GenLocated SrcSpanAnnA (IE GhcRn)]
imports) <- ImportDecl GhcRn
-> Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList ImportDecl GhcRn
decl
  , [Name] -> Int
forall a. [a] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [Name]
unused Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
1
  , Just (L SrcSpanAnnA
loc IE GhcRn
_) <- (GenLocated SrcSpanAnnA (IE GhcRn) -> Bool)
-> [GenLocated SrcSpanAnnA (IE GhcRn)]
-> Maybe (GenLocated SrcSpanAnnA (IE GhcRn))
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Maybe a
find (\(L SrcSpanAnnA
_ IE GhcRn
ie) -> ((IE GhcRn -> IdP GhcRn
forall (p :: Pass). IE (GhcPass p) -> IdP (GhcPass p)
ieName IE GhcRn
ie) :: Name) Name -> [Name] -> Bool
forall a. Eq a => a -> [a] -> Bool
forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [Name]
unused) [GenLocated SrcSpanAnnA (IE GhcRn)]
imports
  = SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnosticAt (SrcSpanAnnA -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc) (ImportDecl GhcRn -> UnusedImportReason -> TcRnMessage
TcRnUnusedImport ImportDecl GhcRn
decl ([UnusedImportName] -> UnusedImportReason
UnusedImportSome [UnusedImportName]
sort_unused))

  -- Some imports are unused
  | Bool
otherwise
  = SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDiagnosticAt (SrcSpanAnnA -> SrcSpan
forall a. SrcSpanAnn' a -> SrcSpan
locA SrcSpanAnnA
loc) (ImportDecl GhcRn -> UnusedImportReason -> TcRnMessage
TcRnUnusedImport ImportDecl GhcRn
decl ([UnusedImportName] -> UnusedImportReason
UnusedImportSome [UnusedImportName]
sort_unused))

  where
    -- In warning message, pretty-print identifiers unqualified unconditionally
    -- to improve the consistent for ambiguous/unambiguous identifiers.
    -- See trac#14881.
    possible_field :: Name -> UnusedImportName
possible_field Name
n =
      case GlobalRdrEnv -> Name -> Maybe GlobalRdrElt
forall info.
Outputable info =>
GlobalRdrEnvX info -> Name -> Maybe (GlobalRdrEltX info)
lookupGRE_Name GlobalRdrEnv
rdr_env Name
n of
        Just (GRE { gre_par :: forall info. GlobalRdrEltX info -> Parent
gre_par = Parent
par, gre_info :: forall info. GlobalRdrEltX info -> info
gre_info = IAmRecField RecFieldInfo
info }) ->
          let fld_occ :: OccName
              fld_occ :: OccName
fld_occ = Name -> OccName
nameOccName (Name -> OccName) -> Name -> OccName
forall a b. (a -> b) -> a -> b
$ FieldLabel -> Name
flSelector (FieldLabel -> Name) -> FieldLabel -> Name
forall a b. (a -> b) -> a -> b
$ RecFieldInfo -> FieldLabel
recFieldLabel RecFieldInfo
info
          in Parent -> OccName -> UnusedImportName
UnusedImportNameRecField Parent
par OccName
fld_occ
        Maybe GlobalRdrElt
_  -> Name -> UnusedImportName
UnusedImportNameRegular Name
n

    -- Print unused names in a deterministic (lexicographic) order
    sort_unused :: [UnusedImportName]
    sort_unused :: [UnusedImportName]
sort_unused = (Name -> UnusedImportName) -> [Name] -> [UnusedImportName]
forall a b. (a -> b) -> [a] -> [b]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Name -> UnusedImportName
possible_field ([Name] -> [UnusedImportName]) -> [Name] -> [UnusedImportName]
forall a b. (a -> b) -> a -> b
$
                  (Name -> Name -> Ordering) -> [Name] -> [Name]
forall a. (a -> a -> Ordering) -> [a] -> [a]
sortBy ((Name -> OccName) -> Name -> Name -> Ordering
forall a b. Ord a => (b -> a) -> b -> b -> Ordering
comparing Name -> OccName
nameOccName) [Name]
unused

{-
Note [Do not warn about Prelude hiding]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We do not warn about
   import Prelude hiding( x, y )
because even if nothing else from Prelude is used, it may be essential to hide
x,y to avoid name-shadowing warnings.  Example (#9061)
   import Prelude hiding( log )
   f x = log where log = ()



Note [Printing minimal imports]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To print the minimal imports we walk over the user-supplied import
decls, and simply trim their import lists.  NB that

  * We do *not* change the 'qualified' or 'as' parts!

  * We do not discard a decl altogether; we might need instances
    from it.  Instead we just trim to an empty import list
-}

getMinimalImports :: [ImportDeclUsage] -> RnM [LImportDecl GhcRn]
getMinimalImports :: [ImportDeclUsage] -> RnM [LImportDecl GhcRn]
getMinimalImports [ImportDeclUsage]
ie_decls
  = do { GlobalRdrEnv
rdr_env <- IOEnv (Env TcGblEnv TcLclEnv) GlobalRdrEnv
getGlobalRdrEnv
       ; ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
 -> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)])
-> IOEnv
     (Env TcGblEnv TcLclEnv) [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> IOEnv
     (Env TcGblEnv TcLclEnv) [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
forall a b.
(a -> b)
-> IOEnv (Env TcGblEnv TcLclEnv) a
-> IOEnv (Env TcGblEnv TcLclEnv) b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap [LImportDecl GhcRn] -> [LImportDecl GhcRn]
[GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
combine (IOEnv
   (Env TcGblEnv TcLclEnv) [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
 -> IOEnv
      (Env TcGblEnv TcLclEnv)
      [GenLocated SrcSpanAnnA (ImportDecl GhcRn)])
-> IOEnv
     (Env TcGblEnv TcLclEnv) [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> IOEnv
     (Env TcGblEnv TcLclEnv) [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
forall a b. (a -> b) -> a -> b
$ ((GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
  [Name])
 -> IOEnv
      (Env TcGblEnv TcLclEnv)
      (GenLocated SrcSpanAnnA (ImportDecl GhcRn)))
-> [(GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
     [Name])]
-> IOEnv
     (Env TcGblEnv TcLclEnv) [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (GlobalRdrEnv
-> (GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
    [Name])
-> IOEnv
     (Env TcGblEnv TcLclEnv) (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
forall {t :: * -> *} {info} {a}.
Foldable t =>
GlobalRdrEnv
-> (GenLocated SrcSpanAnnA (ImportDecl GhcRn),
    [GlobalRdrEltX info], t a)
-> IOEnv
     (Env TcGblEnv TcLclEnv) (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
mk_minimal GlobalRdrEnv
rdr_env) [ImportDeclUsage]
[(GenLocated SrcSpanAnnA (ImportDecl GhcRn), [GlobalRdrElt],
  [Name])]
ie_decls }
  where
    mk_minimal :: GlobalRdrEnv
-> (GenLocated SrcSpanAnnA (ImportDecl GhcRn),
    [GlobalRdrEltX info], t a)
-> IOEnv
     (Env TcGblEnv TcLclEnv) (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
mk_minimal GlobalRdrEnv
rdr_env (L SrcSpanAnnA
l ImportDecl GhcRn
decl, [GlobalRdrEltX info]
used_gres, t a
unused)
      | t a -> Bool
forall a. t a -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null t a
unused
      , Just (ImportListInterpretation
Exactly, XRec GhcRn [LIE GhcRn]
_) <- ImportDecl GhcRn
-> Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList ImportDecl GhcRn
decl
      = GenLocated SrcSpanAnnA (ImportDecl GhcRn)
-> IOEnv
     (Env TcGblEnv TcLclEnv) (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (SrcSpanAnnA
-> ImportDecl GhcRn -> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l ImportDecl GhcRn
decl)
      | Bool
otherwise
      = do { let ImportDecl { ideclName :: forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName    = L SrcSpanAnnA
_ ModuleName
mod_name
                            , ideclSource :: forall pass. ImportDecl pass -> IsBootInterface
ideclSource  = IsBootInterface
is_boot
                            , ideclPkgQual :: forall pass. ImportDecl pass -> ImportDeclPkgQual pass
ideclPkgQual = ImportDeclPkgQual GhcRn
pkg_qual } = ImportDecl GhcRn
decl
           ; ModIface
iface <- SDoc -> ModuleName -> IsBootInterface -> PkgQual -> RnM ModIface
loadSrcInterface SDoc
doc ModuleName
mod_name IsBootInterface
is_boot ImportDeclPkgQual GhcRn
PkgQual
pkg_qual
           ; let used_avails :: [AvailInfo]
used_avails = [GlobalRdrEltX info] -> [AvailInfo]
forall info. [GlobalRdrEltX info] -> [AvailInfo]
gresToAvailInfo [GlobalRdrEltX info]
used_gres
           ; [GenLocated SrcSpanAnnA (IE GhcRn)]
lies <- (IE GhcRn -> GenLocated SrcSpanAnnA (IE GhcRn))
-> [IE GhcRn] -> [GenLocated SrcSpanAnnA (IE GhcRn)]
forall a b. (a -> b) -> [a] -> [b]
map (SrcSpanAnnA -> IE GhcRn -> GenLocated SrcSpanAnnA (IE GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l) ([IE GhcRn] -> [GenLocated SrcSpanAnnA (IE GhcRn)])
-> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
-> IOEnv
     (Env TcGblEnv TcLclEnv) [GenLocated SrcSpanAnnA (IE GhcRn)]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> (AvailInfo -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn])
-> [AvailInfo] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall (m :: * -> *) (f :: * -> *) a b.
(Monad m, Traversable f) =>
(a -> m [b]) -> f a -> m [b]
concatMapM (GlobalRdrEnv
-> ModIface
-> AvailInfo
-> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
to_ie GlobalRdrEnv
rdr_env ModIface
iface) [AvailInfo]
used_avails
           ; GenLocated SrcSpanAnnA (ImportDecl GhcRn)
-> IOEnv
     (Env TcGblEnv TcLclEnv) (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (SrcSpanAnnA
-> ImportDecl GhcRn -> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (ImportDecl GhcRn
decl { ideclImportList = Just (Exactly, L (l2l l) lies) })) }
      where
        doc :: SDoc
doc = String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"Compute minimal imports for" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> ImportDecl GhcRn -> SDoc
forall a. Outputable a => a -> SDoc
ppr ImportDecl GhcRn
decl

    to_ie :: GlobalRdrEnv -> ModIface -> AvailInfo -> RnM [IE GhcRn]
    -- The main trick here is that if we're importing all the constructors
    -- we want to say "T(..)", but if we're importing only a subset we want
    -- to say "T(A,B,C)".  So we have to find out what the module exports.
    to_ie :: GlobalRdrEnv
-> ModIface
-> AvailInfo
-> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
to_ie GlobalRdrEnv
rdr_env ModIface
_ (Avail Name
c)  -- Note [Overloaded field import]
      = do { let
               gre :: GlobalRdrElt
gre = String -> Maybe GlobalRdrElt -> GlobalRdrElt
forall a. HasDebugCallStack => String -> Maybe a -> a
expectJust String
"getMinimalImports Avail" (Maybe GlobalRdrElt -> GlobalRdrElt)
-> Maybe GlobalRdrElt -> GlobalRdrElt
forall a b. (a -> b) -> a -> b
$ GlobalRdrEnv -> Name -> Maybe GlobalRdrElt
forall info.
Outputable info =>
GlobalRdrEnvX info -> Name -> Maybe (GlobalRdrEltX info)
lookupGRE_Name GlobalRdrEnv
rdr_env Name
c
           ; [IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ([IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn])
-> [IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall a b. (a -> b) -> a -> b
$ [XIEVar GhcRn -> LIEWrappedName GhcRn -> IE GhcRn
forall pass. XIEVar pass -> LIEWrappedName pass -> IE pass
IEVar Maybe (LocatedP (WarningTxt GhcRn))
XIEVar GhcRn
forall a. Maybe a
Nothing (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn)
-> LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
forall a b. (a -> b) -> a -> b
$ Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA (Name -> GenLocated SrcSpanAnnA Name)
-> Name -> GenLocated SrcSpanAnnA Name
forall a b. (a -> b) -> a -> b
$ GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName GlobalRdrElt
gre)] }
    to_ie GlobalRdrEnv
_ ModIface
_ avail :: AvailInfo
avail@(AvailTC Name
n [Name
_])  -- Exporting the main decl and nothing else
      | AvailInfo -> Bool
availExportsDecl AvailInfo
avail
      = [IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return [XIEThingAbs GhcRn -> LIEWrappedName GhcRn -> IE GhcRn
forall pass. XIEThingAbs pass -> LIEWrappedName pass -> IE pass
IEThingAbs (Maybe (LocatedP (WarningTxt GhcRn))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
forall a. EpAnn a
noAnn) (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn)
-> LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
forall a b. (a -> b) -> a -> b
$ Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA Name
n)]
    to_ie GlobalRdrEnv
rdr_env ModIface
iface (AvailTC Name
n [Name]
cs) =
      case [ [Name]
xs | avail :: AvailInfo
avail@(AvailTC Name
x [Name]
xs) <- ModIface -> [AvailInfo]
forall (phase :: ModIfacePhase). ModIface_ phase -> [AvailInfo]
mi_exports ModIface
iface
           , Name
x Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
== Name
n
           , AvailInfo -> Bool
availExportsDecl AvailInfo
avail  -- Note [Partial export]
           ] of
        [[Name]
xs]
          | [Name] -> Bool
all_used [Name]
xs
          -> [IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return [XIEThingAll GhcRn -> LIEWrappedName GhcRn -> IE GhcRn
forall pass. XIEThingAll pass -> LIEWrappedName pass -> IE pass
IEThingAll (Maybe (LocatedP (WarningTxt GhcRn))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
forall a. EpAnn a
noAnn) (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn)
-> LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
forall a b. (a -> b) -> a -> b
$ Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA Name
n)]
          | Bool
otherwise
          -> do { let ns_gres :: [GlobalRdrElt]
ns_gres = (Name -> GlobalRdrElt) -> [Name] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map (String -> Maybe GlobalRdrElt -> GlobalRdrElt
forall a. HasDebugCallStack => String -> Maybe a -> a
expectJust String
"getMinimalImports AvailTC" (Maybe GlobalRdrElt -> GlobalRdrElt)
-> (Name -> Maybe GlobalRdrElt) -> Name -> GlobalRdrElt
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GlobalRdrEnv -> Name -> Maybe GlobalRdrElt
forall info.
Outputable info =>
GlobalRdrEnvX info -> Name -> Maybe (GlobalRdrEltX info)
lookupGRE_Name GlobalRdrEnv
rdr_env) [Name]
cs
                      ns :: [Name]
ns = (GlobalRdrElt -> Name) -> [GlobalRdrElt] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName [GlobalRdrElt]
ns_gres
                ; [IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return [XIEThingWith GhcRn
-> LIEWrappedName GhcRn
-> IEWildcard
-> [LIEWrappedName GhcRn]
-> IE GhcRn
forall pass.
XIEThingWith pass
-> LIEWrappedName pass
-> IEWildcard
-> [LIEWrappedName pass]
-> IE pass
IEThingWith (Maybe (LocatedP (WarningTxt GhcRn))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
forall a. EpAnn a
noAnn) (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn)
-> LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
forall a b. (a -> b) -> a -> b
$ Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA Name
n) IEWildcard
NoIEWildcard
                                 ((Name -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> [Name] -> [GenLocated SrcSpanAnnA (IEWrappedName GhcRn)]
forall a b. (a -> b) -> [a] -> [b]
map (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
GenLocated SrcSpanAnnA Name
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
to_ie_post_rn (GenLocated SrcSpanAnnA Name
 -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> (Name -> GenLocated SrcSpanAnnA Name)
-> Name
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA) ((Name -> Bool) -> [Name] -> [Name]
forall a. (a -> Bool) -> [a] -> [a]
filter (Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
/= Name
n) [Name]
ns))] }
                                       -- Note [Overloaded field import]
        [[Name]]
_other
          -> do { let infos :: [GlobalRdrElt]
infos = (Name -> GlobalRdrElt) -> [Name] -> [GlobalRdrElt]
forall a b. (a -> b) -> [a] -> [b]
map (String -> Maybe GlobalRdrElt -> GlobalRdrElt
forall a. HasDebugCallStack => String -> Maybe a -> a
expectJust String
"getMinimalImports AvailTC" (Maybe GlobalRdrElt -> GlobalRdrElt)
-> (Name -> Maybe GlobalRdrElt) -> Name -> GlobalRdrElt
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GlobalRdrEnv -> Name -> Maybe GlobalRdrElt
forall info.
Outputable info =>
GlobalRdrEnvX info -> Name -> Maybe (GlobalRdrEltX info)
lookupGRE_Name GlobalRdrEnv
rdr_env) [Name]
cs
                      ([GlobalRdrElt]
ns_gres,[GlobalRdrElt]
fs_gres) = [GlobalRdrElt] -> ([GlobalRdrElt], [GlobalRdrElt])
classifyGREs [GlobalRdrElt]
infos
                      ns :: [Name]
ns = (GlobalRdrElt -> Name) -> [GlobalRdrElt] -> [Name]
forall a b. (a -> b) -> [a] -> [b]
map GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName ([GlobalRdrElt]
ns_gres [GlobalRdrElt] -> [GlobalRdrElt] -> [GlobalRdrElt]
forall a. [a] -> [a] -> [a]
++ [GlobalRdrElt]
fs_gres)
                      fs :: [RecFieldInfo]
fs = (GlobalRdrElt -> RecFieldInfo) -> [GlobalRdrElt] -> [RecFieldInfo]
forall a b. (a -> b) -> [a] -> [b]
map HasDebugCallStack => GlobalRdrElt -> RecFieldInfo
GlobalRdrElt -> RecFieldInfo
fieldGREInfo [GlobalRdrElt]
fs_gres
                ; [IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ([IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn])
-> [IE GhcRn] -> IOEnv (Env TcGblEnv TcLclEnv) [IE GhcRn]
forall a b. (a -> b) -> a -> b
$
                  if [RecFieldInfo] -> Bool
all_non_overloaded [RecFieldInfo]
fs
                  then (Name -> IE GhcRn) -> [Name] -> [IE GhcRn]
forall a b. (a -> b) -> [a] -> [b]
map (XIEVar GhcRn -> LIEWrappedName GhcRn -> IE GhcRn
forall pass. XIEVar pass -> LIEWrappedName pass -> IE pass
IEVar Maybe (LocatedP (WarningTxt GhcRn))
XIEVar GhcRn
forall a. Maybe a
Nothing (GenLocated SrcSpanAnnA (IEWrappedName GhcRn) -> IE GhcRn)
-> (Name -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> Name
-> IE GhcRn
forall b c a. (b -> c) -> (a -> b) -> a -> c
. LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
GenLocated SrcSpanAnnA Name
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
to_ie_post_rn_var (GenLocated SrcSpanAnnA Name
 -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> (Name -> GenLocated SrcSpanAnnA Name)
-> Name
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA) [Name]
ns
                  else [XIEThingWith GhcRn
-> LIEWrappedName GhcRn
-> IEWildcard
-> [LIEWrappedName GhcRn]
-> IE GhcRn
forall pass.
XIEThingWith pass
-> LIEWrappedName pass
-> IEWildcard
-> [LIEWrappedName pass]
-> IE pass
IEThingWith (Maybe (LocatedP (WarningTxt GhcRn))
forall a. Maybe a
Nothing, EpAnn [AddEpAnn]
forall a. EpAnn a
noAnn) (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn)
-> LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
forall a b. (a -> b) -> a -> b
$ Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA Name
n) IEWildcard
NoIEWildcard
                         ((Name -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> [Name] -> [GenLocated SrcSpanAnnA (IEWrappedName GhcRn)]
forall a b. (a -> b) -> [a] -> [b]
map (LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
GenLocated SrcSpanAnnA Name
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
to_ie_post_rn (GenLocated SrcSpanAnnA Name
 -> GenLocated SrcSpanAnnA (IEWrappedName GhcRn))
-> (Name -> GenLocated SrcSpanAnnA Name)
-> Name
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Name -> GenLocated SrcSpanAnnA Name
forall a an. a -> LocatedAn an a
noLocA) ((Name -> Bool) -> [Name] -> [Name]
forall a. (a -> Bool) -> [a] -> [a]
filter (Name -> Name -> Bool
forall a. Eq a => a -> a -> Bool
/= Name
n) [Name]
ns))] }
        where

          all_used :: [Name] -> Bool
all_used [Name]
avail_cs = (Name -> Bool) -> [Name] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all (Name -> [Name] -> Bool
forall a. Eq a => a -> [a] -> Bool
forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [Name]
cs) [Name]
avail_cs

          all_non_overloaded :: [RecFieldInfo] -> Bool
all_non_overloaded = (RecFieldInfo -> Bool) -> [RecFieldInfo] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all (Bool -> Bool
not (Bool -> Bool) -> (RecFieldInfo -> Bool) -> RecFieldInfo -> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. FieldLabel -> Bool
flIsOverloaded (FieldLabel -> Bool)
-> (RecFieldInfo -> FieldLabel) -> RecFieldInfo -> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. RecFieldInfo -> FieldLabel
recFieldLabel)

    combine :: [LImportDecl GhcRn] -> [LImportDecl GhcRn]
    combine :: [LImportDecl GhcRn] -> [LImportDecl GhcRn]
combine = (NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
 -> GenLocated SrcSpanAnnA (ImportDecl GhcRn))
-> [NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))]
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
forall a b. (a -> b) -> [a] -> [b]
map NonEmpty (LImportDecl GhcRn) -> LImportDecl GhcRn
NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
-> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
merge ([NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))]
 -> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)])
-> ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
    -> [NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))])
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (GenLocated SrcSpanAnnA (ImportDecl GhcRn)
 -> (Bool, Maybe ModuleName, ModuleName))
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> [NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))]
forall b a. Ord b => (a -> b) -> [a] -> [NonEmpty a]
NE.groupAllWith LImportDecl GhcRn -> (Bool, Maybe ModuleName, ModuleName)
GenLocated SrcSpanAnnA (ImportDecl GhcRn)
-> (Bool, Maybe ModuleName, ModuleName)
getKey

    getKey :: LImportDecl GhcRn -> (Bool, Maybe ModuleName, ModuleName)
    getKey :: LImportDecl GhcRn -> (Bool, Maybe ModuleName, ModuleName)
getKey LImportDecl GhcRn
decl =
      ( ImportDeclQualifiedStyle -> Bool
isImportDeclQualified (ImportDeclQualifiedStyle -> Bool)
-> (ImportDecl GhcRn -> ImportDeclQualifiedStyle)
-> ImportDecl GhcRn
-> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ImportDecl GhcRn -> ImportDeclQualifiedStyle
forall pass. ImportDecl pass -> ImportDeclQualifiedStyle
ideclQualified (ImportDecl GhcRn -> Bool) -> ImportDecl GhcRn -> Bool
forall a b. (a -> b) -> a -> b
$ ImportDecl GhcRn
idecl -- is this qualified? (important that this be first)
      , GenLocated SrcSpanAnnA ModuleName -> ModuleName
forall l e. GenLocated l e -> e
unLoc (GenLocated SrcSpanAnnA ModuleName -> ModuleName)
-> Maybe (GenLocated SrcSpanAnnA ModuleName) -> Maybe ModuleName
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> ImportDecl GhcRn -> Maybe (XRec GhcRn ModuleName)
forall pass. ImportDecl pass -> Maybe (XRec pass ModuleName)
ideclAs ImportDecl GhcRn
idecl -- what is the qualifier (inside Maybe monad)
      , GenLocated SrcSpanAnnA ModuleName -> ModuleName
forall l e. GenLocated l e -> e
unLoc (GenLocated SrcSpanAnnA ModuleName -> ModuleName)
-> (ImportDecl GhcRn -> GenLocated SrcSpanAnnA ModuleName)
-> ImportDecl GhcRn
-> ModuleName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ImportDecl GhcRn -> XRec GhcRn ModuleName
ImportDecl GhcRn -> GenLocated SrcSpanAnnA ModuleName
forall pass. ImportDecl pass -> XRec pass ModuleName
ideclName (ImportDecl GhcRn -> ModuleName) -> ImportDecl GhcRn -> ModuleName
forall a b. (a -> b) -> a -> b
$ ImportDecl GhcRn
idecl -- Module Name
      )
      where
        idecl :: ImportDecl GhcRn
        idecl :: ImportDecl GhcRn
idecl = GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> ImportDecl GhcRn
forall l e. GenLocated l e -> e
unLoc LImportDecl GhcRn
GenLocated SrcSpanAnnA (ImportDecl GhcRn)
decl

    merge :: NonEmpty (LImportDecl GhcRn) -> LImportDecl GhcRn
    merge :: NonEmpty (LImportDecl GhcRn) -> LImportDecl GhcRn
merge decls :: NonEmpty (LImportDecl GhcRn)
decls@((L SrcSpanAnnA
l ImportDecl GhcRn
decl) :| [LImportDecl GhcRn]
_) = SrcSpanAnnA
-> ImportDecl GhcRn -> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (ImportDecl GhcRn
decl { ideclImportList = Just (Exactly, L (noAnnSrcSpan (locA l)) lies) })
      where lies :: [LIE GhcRn]
lies = ((ImportListInterpretation, LocatedL [LIE GhcRn]) -> [LIE GhcRn])
-> [(ImportListInterpretation, LocatedL [LIE GhcRn])]
-> [LIE GhcRn]
forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap (LocatedL [LIE GhcRn] -> [LIE GhcRn]
forall l e. GenLocated l e -> e
unLoc (LocatedL [LIE GhcRn] -> [LIE GhcRn])
-> ((ImportListInterpretation, LocatedL [LIE GhcRn])
    -> LocatedL [LIE GhcRn])
-> (ImportListInterpretation, LocatedL [LIE GhcRn])
-> [LIE GhcRn]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (ImportListInterpretation, LocatedL [LIE GhcRn])
-> LocatedL [LIE GhcRn]
forall a b. (a, b) -> b
snd) ([(ImportListInterpretation, LocatedL [LIE GhcRn])] -> [LIE GhcRn])
-> [(ImportListInterpretation, LocatedL [LIE GhcRn])]
-> [LIE GhcRn]
forall a b. (a -> b) -> a -> b
$ (GenLocated SrcSpanAnnA (ImportDecl GhcRn)
 -> Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]))
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> [(ImportListInterpretation, LocatedL [LIE GhcRn])]
forall a b. (a -> Maybe b) -> [a] -> [b]
mapMaybe (ImportDecl GhcRn
-> Maybe (ImportListInterpretation, XRec GhcRn [LIE GhcRn])
ImportDecl GhcRn
-> Maybe (ImportListInterpretation, LocatedL [LIE GhcRn])
forall pass.
ImportDecl pass
-> Maybe (ImportListInterpretation, XRec pass [LIE pass])
ideclImportList (ImportDecl GhcRn
 -> Maybe (ImportListInterpretation, LocatedL [LIE GhcRn]))
-> (GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> ImportDecl GhcRn)
-> GenLocated SrcSpanAnnA (ImportDecl GhcRn)
-> Maybe (ImportListInterpretation, LocatedL [LIE GhcRn])
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> ImportDecl GhcRn
forall l e. GenLocated l e -> e
unLoc) ([GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
 -> [(ImportListInterpretation, LocatedL [LIE GhcRn])])
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
-> [(ImportListInterpretation, LocatedL [LIE GhcRn])]
forall a b. (a -> b) -> a -> b
$ NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
forall a. NonEmpty a -> [a]
NE.toList NonEmpty (LImportDecl GhcRn)
NonEmpty (GenLocated SrcSpanAnnA (ImportDecl GhcRn))
decls

classifyGREs :: [GlobalRdrElt] -> ([GlobalRdrElt], [FieldGlobalRdrElt])
classifyGREs :: [GlobalRdrElt] -> ([GlobalRdrElt], [GlobalRdrElt])
classifyGREs = (GlobalRdrElt -> Bool)
-> [GlobalRdrElt] -> ([GlobalRdrElt], [GlobalRdrElt])
forall a. (a -> Bool) -> [a] -> ([a], [a])
partition (Bool -> Bool
not (Bool -> Bool) -> (GlobalRdrElt -> Bool) -> GlobalRdrElt -> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GlobalRdrElt -> Bool
forall info. GlobalRdrEltX info -> Bool
isRecFldGRE)

printMinimalImports :: HscSource -> [ImportDeclUsage] -> RnM ()
-- See Note [Printing minimal imports]
printMinimalImports :: HscSource -> [ImportDeclUsage] -> IOEnv (Env TcGblEnv TcLclEnv) ()
printMinimalImports HscSource
hsc_src [ImportDeclUsage]
imports_w_usage
  = do { [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
imports' <- [ImportDeclUsage] -> RnM [LImportDecl GhcRn]
getMinimalImports [ImportDeclUsage]
imports_w_usage
       ; Module
this_mod <- IOEnv (Env TcGblEnv TcLclEnv) Module
forall (m :: * -> *). HasModule m => m Module
getModule
       ; DynFlags
dflags   <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
       ; IO () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a. IO a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO () -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> IO () -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$ String -> IOMode -> (Handle -> IO ()) -> IO ()
forall r. String -> IOMode -> (Handle -> IO r) -> IO r
withFile (DynFlags -> Module -> String
mkFilename DynFlags
dflags Module
this_mod) IOMode
WriteMode ((Handle -> IO ()) -> IO ()) -> (Handle -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \Handle
h ->
          DynFlags -> Handle -> NamePprCtx -> Depth -> SDoc -> IO ()
printForUser DynFlags
dflags Handle
h NamePprCtx
neverQualify Depth
AllTheWay ([SDoc] -> SDoc
forall doc. IsDoc doc => [doc] -> doc
vcat ((GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> SDoc)
-> [GenLocated SrcSpanAnnA (ImportDecl GhcRn)] -> [SDoc]
forall a b. (a -> b) -> [a] -> [b]
map GenLocated SrcSpanAnnA (ImportDecl GhcRn) -> SDoc
forall a. Outputable a => a -> SDoc
ppr [GenLocated SrcSpanAnnA (ImportDecl GhcRn)]
imports'))
              -- The neverQualify is important.  We are printing Names
              -- but they are in the context of an 'import' decl, and
              -- we never qualify things inside there
              -- E.g.   import Blag( f, b )
              -- not    import Blag( Blag.f, Blag.g )!
       }
  where
    mkFilename :: DynFlags -> Module -> String
mkFilename DynFlags
dflags Module
this_mod
      | Just String
d <- DynFlags -> Maybe String
dumpDir DynFlags
dflags = String
d String -> String -> String
</> String
basefn
      | Bool
otherwise                = String
basefn
      where
        suffix :: String
suffix = case HscSource
hsc_src of
                     HscSource
HsBootFile -> String
".imports-boot"
                     HscSource
HsSrcFile  -> String
".imports"
                     HscSource
HsigFile   -> String
".imports"
        basefn :: String
basefn = ModuleName -> String
moduleNameString (Module -> ModuleName
forall unit. GenModule unit -> ModuleName
moduleName Module
this_mod) String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
suffix


to_ie_post_rn_var :: LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn_var :: LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn_var (L SrcSpanAnnA
l IdP GhcRn
n)
  | OccName -> Bool
isDataOcc (OccName -> Bool) -> OccName -> Bool
forall a b. (a -> b) -> a -> b
$ Name -> OccName
forall name. HasOccName name => name -> OccName
occName IdP GhcRn
Name
n = SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (XIEPattern GhcRn -> LIdP GhcRn -> IEWrappedName GhcRn
forall p. XIEPattern p -> LIdP p -> IEWrappedName p
IEPattern (SrcSpanAnnA -> EpaLocation
forall a. SrcSpanAnn' a -> EpaLocation
la2e SrcSpanAnnA
l)   (SrcSpanAnnN -> Name -> GenLocated SrcSpanAnnN Name
forall l e. l -> e -> GenLocated l e
L (SrcSpanAnnA -> SrcSpanAnnN
forall a. SrcSpanAnn' a -> SrcSpanAnnN
la2na SrcSpanAnnA
l) IdP GhcRn
Name
n))
  | Bool
otherwise             = SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (XIEName GhcRn -> LIdP GhcRn -> IEWrappedName GhcRn
forall p. XIEName p -> LIdP p -> IEWrappedName p
IEName    XIEName GhcRn
NoExtField
noExtField (SrcSpanAnnN -> Name -> GenLocated SrcSpanAnnN Name
forall l e. l -> e -> GenLocated l e
L (SrcSpanAnnA -> SrcSpanAnnN
forall a. SrcSpanAnn' a -> SrcSpanAnnN
la2na SrcSpanAnnA
l) IdP GhcRn
Name
n))


to_ie_post_rn :: LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn :: LocatedA (IdP GhcRn) -> LIEWrappedName GhcRn
to_ie_post_rn (L SrcSpanAnnA
l IdP GhcRn
n)
  | OccName -> Bool
isTcOcc OccName
occ Bool -> Bool -> Bool
&& OccName -> Bool
isSymOcc OccName
occ = SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (XIEType GhcRn -> LIdP GhcRn -> IEWrappedName GhcRn
forall p. XIEType p -> LIdP p -> IEWrappedName p
IEType (SrcSpanAnnA -> EpaLocation
forall a. SrcSpanAnn' a -> EpaLocation
la2e SrcSpanAnnA
l)   (SrcSpanAnnN -> Name -> GenLocated SrcSpanAnnN Name
forall l e. l -> e -> GenLocated l e
L (SrcSpanAnnA -> SrcSpanAnnN
forall a. SrcSpanAnn' a -> SrcSpanAnnN
la2na SrcSpanAnnA
l) IdP GhcRn
Name
n))
  | Bool
otherwise                   = SrcSpanAnnA
-> IEWrappedName GhcRn
-> GenLocated SrcSpanAnnA (IEWrappedName GhcRn)
forall l e. l -> e -> GenLocated l e
L SrcSpanAnnA
l (XIEName GhcRn -> LIdP GhcRn -> IEWrappedName GhcRn
forall p. XIEName p -> LIdP p -> IEWrappedName p
IEName XIEName GhcRn
NoExtField
noExtField (SrcSpanAnnN -> Name -> GenLocated SrcSpanAnnN Name
forall l e. l -> e -> GenLocated l e
L (SrcSpanAnnA -> SrcSpanAnnN
forall a. SrcSpanAnn' a -> SrcSpanAnnN
la2na SrcSpanAnnA
l) IdP GhcRn
Name
n))
  where occ :: OccName
occ = Name -> OccName
forall name. HasOccName name => name -> OccName
occName IdP GhcRn
Name
n

{-
Note [Partial export]
~~~~~~~~~~~~~~~~~~~~~
Suppose we have

   module A( op ) where
     class C a where
       op :: a -> a

   module B where
   import A
   f = ..op...

Then the minimal import for module B is
   import A( op )
not
   import A( C( op ) )
which we would usually generate if C was exported from B.  Hence
the availExportsDecl test when deciding what to generate.


Note [Overloaded field import]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On the other hand, if we have

    {-# LANGUAGE DuplicateRecordFields #-}
    module A where
      data T = MkT { foo :: Int }

    module B where
      import A
      f = ...foo...

then the minimal import for module B must be
    import A ( T(foo) )
because when DuplicateRecordFields is enabled, field selectors are
not in scope without their enclosing datatype.

On the third hand, if we have

    {-# LANGUAGE DuplicateRecordFields #-}
    module A where
      pattern MkT { foo } = Just foo

    module B where
      import A
      f = ...foo...

then the minimal import for module B must be
    import A ( foo )
because foo doesn't have a parent.  This might actually be ambiguous if A
exports another field called foo, but there is no good answer to return and this
is a very obscure corner, so it seems to be the best we can do.  See
DRFPatSynExport for a test of this.


************************************************************************
*                                                                      *
\subsection{Errors}
*                                                                      *
************************************************************************
-}

badImportItemErr
  :: ModIface -> ImpDeclSpec -> IE GhcPs -> IsSubordinate
  -> [AvailInfo]
  -> TcRn ImportLookupReason
badImportItemErr :: ModIface
-> ImpDeclSpec
-> IE (GhcPass 'Parsed)
-> IsSubordinate
-> [AvailInfo]
-> TcRn ImportLookupReason
badImportItemErr ModIface
iface ImpDeclSpec
decl_spec IE (GhcPass 'Parsed)
ie IsSubordinate
sub [AvailInfo]
avails = do
  Bool
patsyns_enabled <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
xoptM Extension
LangExt.PatternSynonyms
  DynFlags
dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
  HscEnv
hsc_env <- TcRnIf TcGblEnv TcLclEnv HscEnv
forall gbl lcl. TcRnIf gbl lcl HscEnv
getTopEnv
  let rdr_env :: GlobalRdrEnv
rdr_env = [GlobalRdrElt] -> GlobalRdrEnv
mkGlobalRdrEnv
              ([GlobalRdrElt] -> GlobalRdrEnv) -> [GlobalRdrElt] -> GlobalRdrEnv
forall a b. (a -> b) -> a -> b
$ HscEnv -> Maybe ImportSpec -> [AvailInfo] -> [GlobalRdrElt]
gresFromAvails HscEnv
hsc_env (ImportSpec -> Maybe ImportSpec
forall a. a -> Maybe a
Just ImportSpec
imp_spec) [AvailInfo]
all_avails
  ImportLookupReason -> TcRn ImportLookupReason
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (BadImportKind
-> ModIface
-> ImpDeclSpec
-> IE (GhcPass 'Parsed)
-> Bool
-> ImportLookupReason
ImportLookupBad (DynFlags -> GlobalRdrEnv -> BadImportKind
importErrorKind DynFlags
dflags GlobalRdrEnv
rdr_env) ModIface
iface ImpDeclSpec
decl_spec IE (GhcPass 'Parsed)
ie Bool
patsyns_enabled)
  where
    importErrorKind :: DynFlags -> GlobalRdrEnv -> BadImportKind
importErrorKind DynFlags
dflags GlobalRdrEnv
rdr_env
      | (AvailInfo -> Bool) -> [AvailInfo] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
any AvailInfo -> Bool
checkIfTyCon [AvailInfo]
avails = case IsSubordinate
sub of
          IsSubordinate
IsNotSubordinate -> BadImportKind
BadImportAvailTyCon
          IsSubordinate
IsSubordinate -> [OccName] -> BadImportKind
BadImportNotExportedSubordinates [OccName]
unavailableChildren
      | (AvailInfo -> Bool) -> [AvailInfo] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
any AvailInfo -> Bool
checkIfVarName [AvailInfo]
avails = BadImportKind
BadImportAvailVar
      | Just AvailInfo
con <- (AvailInfo -> Bool) -> [AvailInfo] -> Maybe AvailInfo
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Maybe a
find AvailInfo -> Bool
checkIfDataCon [AvailInfo]
avails = OccName -> BadImportKind
BadImportAvailDataCon (AvailInfo -> OccName
availOccName AvailInfo
con)
      | Bool
otherwise = [GhcHint] -> BadImportKind
BadImportNotExported [GhcHint]
suggs
        where
          suggs :: [GhcHint]
suggs = [GhcHint]
similar_suggs [GhcHint] -> [GhcHint] -> [GhcHint]
forall a. [a] -> [a] -> [a]
++ GlobalRdrEnv -> RdrName -> [GhcHint]
fieldSelectorSuggestions GlobalRdrEnv
rdr_env IdP (GhcPass 'Parsed)
RdrName
rdr
          similar_names :: [SimilarName]
similar_names =
            LookingFor
-> DynFlags
-> GlobalRdrEnv
-> LocalRdrEnv
-> RdrName
-> [SimilarName]
similarNameSuggestions (WhatLooking -> WhereLooking -> LookingFor
Unbound.LF WhatLooking
WL_Anything WhereLooking
WL_Global)
              DynFlags
dflags GlobalRdrEnv
rdr_env LocalRdrEnv
emptyLocalRdrEnv IdP (GhcPass 'Parsed)
RdrName
rdr
          similar_suggs :: [GhcHint]
similar_suggs =
            case [SimilarName] -> Maybe (NonEmpty SimilarName)
forall a. [a] -> Maybe (NonEmpty a)
NE.nonEmpty ([SimilarName] -> Maybe (NonEmpty SimilarName))
-> [SimilarName] -> Maybe (NonEmpty SimilarName)
forall a b. (a -> b) -> a -> b
$ (SimilarName -> Maybe SimilarName)
-> [SimilarName] -> [SimilarName]
forall a b. (a -> Maybe b) -> [a] -> [b]
mapMaybe SimilarName -> Maybe SimilarName
imported_item ([SimilarName] -> [SimilarName]) -> [SimilarName] -> [SimilarName]
forall a b. (a -> b) -> a -> b
$ [SimilarName]
similar_names of
              Just NonEmpty SimilarName
similar -> [ RdrName -> NonEmpty SimilarName -> GhcHint
SuggestSimilarNames IdP (GhcPass 'Parsed)
RdrName
rdr NonEmpty SimilarName
similar ]
              Maybe (NonEmpty SimilarName)
Nothing      -> [ ]

          -- Only keep imported items, and set the "HowInScope" to
          -- "Nothing" to avoid printing "imported from..." in the suggestion
          -- error message.
          imported_item :: SimilarName -> Maybe SimilarName
imported_item (SimilarRdrName RdrName
rdr_name (Just (ImportedBy {})))
            = SimilarName -> Maybe SimilarName
forall a. a -> Maybe a
Just (RdrName -> Maybe HowInScope -> SimilarName
SimilarRdrName RdrName
rdr_name Maybe HowInScope
forall a. Maybe a
Nothing)
          imported_item SimilarName
_ = Maybe SimilarName
forall a. Maybe a
Nothing

    checkIfDataCon :: AvailInfo -> Bool
checkIfDataCon = (Name -> Bool) -> AvailInfo -> Bool
checkIfAvailMatches Name -> Bool
isDataConName
    checkIfTyCon :: AvailInfo -> Bool
checkIfTyCon = (Name -> Bool) -> AvailInfo -> Bool
checkIfAvailMatches Name -> Bool
isTyConName
    checkIfVarName :: AvailInfo -> Bool
checkIfVarName =
      \case
        AvailTC{} -> Bool
False
        Avail Name
n -> FastString
importedFS FastString -> FastString -> Bool
forall a. Eq a => a -> a -> Bool
== OccName -> FastString
occNameFS (Name -> OccName
forall name. HasOccName name => name -> OccName
occName Name
n)
                Bool -> Bool -> Bool
&& (OccName -> Bool
isVarOcc (OccName -> Bool) -> (OccName -> Bool) -> OccName -> Bool
forall (f :: * -> *). Applicative f => f Bool -> f Bool -> f Bool
<||> OccName -> Bool
isFieldOcc) (Name -> OccName
forall name. HasOccName name => name -> OccName
occName Name
n)
    checkIfAvailMatches :: (Name -> Bool) -> AvailInfo -> Bool
checkIfAvailMatches Name -> Bool
namePred =
      \case
        AvailTC Name
_ [Name]
ns ->
          case (Name -> Bool) -> [Name] -> Maybe Name
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Maybe a
find (\Name
n -> FastString
importedFS FastString -> FastString -> Bool
forall a. Eq a => a -> a -> Bool
== OccName -> FastString
occNameFS (Name -> OccName
forall name. HasOccName name => name -> OccName
occName Name
n)) [Name]
ns of
            Just Name
n  -> Name -> Bool
namePred Name
n
            Maybe Name
Nothing -> Bool
False
        Avail{} -> Bool
False
    availOccName :: AvailInfo -> OccName
availOccName = Name -> OccName
forall name. HasOccName name => name -> OccName
occName (Name -> OccName) -> (AvailInfo -> Name) -> AvailInfo -> OccName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. AvailInfo -> Name
availName
    rdr :: IdP (GhcPass 'Parsed)
rdr = IE (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
forall (p :: Pass). IE (GhcPass p) -> IdP (GhcPass p)
ieName IE (GhcPass 'Parsed)
ie
    importedFS :: FastString
importedFS = OccName -> FastString
occNameFS (OccName -> FastString) -> OccName -> FastString
forall a b. (a -> b) -> a -> b
$ RdrName -> OccName
rdrNameOcc IdP (GhcPass 'Parsed)
RdrName
rdr
    imp_spec :: ImportSpec
imp_spec = ImpSpec { is_decl :: ImpDeclSpec
is_decl = ImpDeclSpec
decl_spec, is_item :: ImpItemSpec
is_item = ImpItemSpec
ImpAll }
    all_avails :: [AvailInfo]
all_avails = ModIface -> [AvailInfo]
forall (phase :: ModIfacePhase). ModIface_ phase -> [AvailInfo]
mi_exports ModIface
iface
    unavailableChildren :: [OccName]
unavailableChildren = case IE (GhcPass 'Parsed)
ie of
      IEThingWith XIEThingWith (GhcPass 'Parsed)
_ LIEWrappedName (GhcPass 'Parsed)
_ IEWildcard
_ [LIEWrappedName (GhcPass 'Parsed)]
ns -> (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
 -> OccName)
-> [GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
-> [OccName]
forall a b. (a -> b) -> [a] -> [b]
map (RdrName -> OccName
rdrNameOcc (RdrName -> OccName)
-> (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
    -> RdrName)
-> GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
-> OccName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. IEWrappedName (GhcPass 'Parsed) -> IdP (GhcPass 'Parsed)
IEWrappedName (GhcPass 'Parsed) -> RdrName
forall (p :: Pass). IEWrappedName (GhcPass p) -> IdP (GhcPass p)
ieWrappedName  (IEWrappedName (GhcPass 'Parsed) -> RdrName)
-> (GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
    -> IEWrappedName (GhcPass 'Parsed))
-> GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
-> RdrName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))
-> IEWrappedName (GhcPass 'Parsed)
forall l e. GenLocated l e -> e
unLoc) [LIEWrappedName (GhcPass 'Parsed)]
[GenLocated SrcSpanAnnA (IEWrappedName (GhcPass 'Parsed))]
ns
      IE (GhcPass 'Parsed)
_ -> String -> [OccName]
forall a. HasCallStack => String -> a
panic String
"importedChildren failed pattern match: no children"

addDupDeclErr :: NonEmpty GlobalRdrElt -> TcRn ()
addDupDeclErr :: NonEmpty GlobalRdrElt -> IOEnv (Env TcGblEnv TcLclEnv) ()
addDupDeclErr gres :: NonEmpty GlobalRdrElt
gres@(GlobalRdrElt
gre :| [GlobalRdrElt]
_)
  -- Report the error at the later location
  = SrcSpan -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
addErrAt (Name -> SrcSpan
forall a. NamedThing a => a -> SrcSpan
getSrcSpan (NonEmpty Name -> Name
forall a. NonEmpty a -> a
NE.last NonEmpty Name
sorted_names)) (TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ())
-> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
forall a b. (a -> b) -> a -> b
$ (OccName -> NonEmpty Name -> TcRnMessage
TcRnDuplicateDecls (GlobalRdrElt -> OccName
forall info. GlobalRdrEltX info -> OccName
greOccName GlobalRdrElt
gre) NonEmpty Name
sorted_names)
  where
    sorted_names :: NonEmpty Name
sorted_names =
      (Name -> Name -> Ordering) -> NonEmpty Name -> NonEmpty Name
forall a. (a -> a -> Ordering) -> NonEmpty a -> NonEmpty a
NE.sortBy (SrcSpan -> SrcSpan -> Ordering
SrcLoc.leftmost_smallest (SrcSpan -> SrcSpan -> Ordering)
-> (Name -> SrcSpan) -> Name -> Name -> Ordering
forall b c a. (b -> b -> c) -> (a -> b) -> a -> a -> c
`on` Name -> SrcSpan
nameSrcSpan)
        ((GlobalRdrElt -> Name) -> NonEmpty GlobalRdrElt -> NonEmpty Name
forall a b. (a -> b) -> NonEmpty a -> NonEmpty b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap GlobalRdrElt -> Name
forall info. GlobalRdrEltX info -> Name
greName NonEmpty GlobalRdrElt
gres)

-- This data decl will parse OK
--      data T = a Int
-- treating "a" as the constructor.
-- It is really hard to make the parser spot this malformation.
-- So the renamer has to check that the constructor is legal
--
-- We can get an operator as the constructor, even in the prefix form:
--      data T = :% Int Int
-- from interface files, which always print in prefix form
--
-- We also allow type constructor names, which are defined by "type data"
-- declarations.  See Note [Type data declarations] in GHC.Rename.Module.

checkConName :: RdrName -> TcRn ()
checkConName :: RdrName -> IOEnv (Env TcGblEnv TcLclEnv) ()
checkConName RdrName
name
  = Bool -> TcRnMessage -> IOEnv (Env TcGblEnv TcLclEnv) ()
checkErr (RdrName -> Bool
isRdrDataCon RdrName
name Bool -> Bool -> Bool
|| RdrName -> Bool
isRdrTc RdrName
name) (RdrName -> TcRnMessage
TcRnIllegalDataCon RdrName
name)