[Git][ghc/ghc][wip/fabu/T25014-mistakenly-accepted-parent] wip
Fabricio Nascimento (@fabu)
gitlab at gitlab.haskell.org
Wed Jul 3 10:15:29 UTC 2024
Fabricio Nascimento pushed to branch wip/fabu/T25014-mistakenly-accepted-parent at Glasgow Haskell Compiler / GHC
Commits:
cf81fcea by Fabricio de Sousa Nascimento at 2024-07-03T19:14:58+09:00
wip
- - - - -
14 changed files:
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Types/Name/Reader.hs
- + testsuite/tests/rename/T25014/Ambig1.hs
- + testsuite/tests/rename/T25014/Ambig2.hs
- + testsuite/tests/rename/T25014/T25014a.hs
- + testsuite/tests/rename/T25014/T25014a.stderr
- + testsuite/tests/rename/T25014/T25014b.hs
- + testsuite/tests/rename/T25014/T25014b.stderr
- + testsuite/tests/rename/T25014/T25014c.hs
- + testsuite/tests/rename/T25014/T25014c.stderr
- + testsuite/tests/rename/T25014/T25014d.hs
- + testsuite/tests/rename/T25014/T25014d.stderr
- + testsuite/tests/rename/T25014/all.T
Changes:
=====================================
compiler/GHC/Rename/Env.hs
=====================================
@@ -32,7 +32,8 @@ module GHC.Rename.Env (
getUpdFieldLbls,
ChildLookupResult(..),
- lookupSubBndrOcc_helper,
+ lookupSubBndrOccOnTypeClass,
+ lookupSubBndrOccOnExportList,
HsSigCtxt(..), lookupLocalTcNames, lookupSigOccRn, lookupSigOccRnN,
lookupSigCtxtOccRn,
@@ -111,9 +112,8 @@ import Control.Arrow ( first )
import Control.Monad
import Data.Either ( partitionEithers )
import Data.Function ( on )
-import Data.List ( find, partition, groupBy, sortBy )
+import Data.List ( find, partition, groupBy, sortBy, foldl' )
import qualified Data.List.NonEmpty as NE
-import qualified Data.Semigroup as Semi
import System.IO.Unsafe ( unsafePerformIO )
{-
@@ -677,109 +677,204 @@ disambiguation anyway, because `x` is an original name, and
lookupGlobalOccRn will find it.
-}
--- | Used in export lists to lookup the children.
-lookupSubBndrOcc_helper :: Bool -> DeprecationWarnings
- -> Name
- -> RdrName -- ^ thing we are looking up
+-- SPOTMARK
+
+-- Find all the things the 'RdrName' maps to,
+-- and pick the one with the right 'Parent' 'Name'.
+lookupSubBndrOcc :: DeprecationWarnings
+ -> Name -- ^ Parent
+ -> SDoc
+ -> RdrName -- ^ thing we are looking up
+ -> RnM (Either NotInScopeError Name)
+lookupSubBndrOcc warn_if_deprec the_parent doc rdr_name =
+ lookupExactOrOrig rdr_name (Right . greName) $
+ -- This happens for built-in classes, for example T24452c
+ do { child <- lookupSubBndrOccOnTypeClass warn_if_deprec the_parent rdr_name what_lkup
+ ; return $ case child of
+ FoundChild g -> Right (greName g)
+ NameNotFound -> Left (UnknownSubordinate doc)
+ IncorrectParent {} -> Left (UnknownSubordinate doc) }
+ -- See [Mismatched class methods and associated type families]
+ -- in TcInstDecls.
+ where
+ what_lkup = LookupChild { wantedParent = the_parent
+ , lookupDataConFirst = False
+ , prioritiseParent = True -- See T23664.
+ }
+
+{- NOTE [ Differences in name lookup for Export List and Type Classes ]
+
+Even though the logic to lookup in the export list and instance methods
+for type classes share some common behavior (see Note [childGREPriority])
+they differ on how they report errors. Unifying those in a single method
+caused some subtle issue (see #24452, #25014).
+
+For example on exports lists, you could export a name for a different parent
+in the case of (pattern synonyms) while for type classes the parent must match
+so names with different parents should be report as an error.
+-}
+lookupSubBndrOccOnTypeClass :: DeprecationWarnings
+ -> Name -- ^ Parent
+ -> RdrName -- ^ thing we are looking up
-> LookupChild -- ^ how to look it up (e.g. which
-- 'NameSpace's to look in)
-> RnM ChildLookupResult
-lookupSubBndrOcc_helper must_have_parent warn_if_deprec parent rdr_name how_lkup
- | isUnboundName parent
- -- Avoid an error cascade
- = return (FoundChild (mkUnboundGRERdr rdr_name))
+lookupSubBndrOccOnTypeClass warn_if_deprec parent rdr_name how_lkup =
+ if isUnboundName parent
+ -- Avoid an error cascade, see Note [ Unbound vs Ambiguous Names ]
+ then return (FoundChild (mkUnboundGRERdr rdr_name))
+ else do
+ traceTc "lookupSubBndrOccOnTypeClass" (vcat [])
+ (picked_gres, original_gres) <- lookupSubBndrOcc_helper parent rdr_name how_lkup
+ case picked_gres of
+ NoOccurrence -> do
+ no_matching_parent_error parent rdr_name original_gres
+ NoParentOccurrence _ -> do
+ -- This unique occurrence will have no parent, and thus can't match the parent
+ -- we are looking for.
+ no_matching_parent_error parent rdr_name original_gres
+ MatchingParentOccurrence g -> do
+ mark_used_found_child warn_if_deprec g
+ AmbiguousOccurrence _ -> do
+ -- It is more helpful to tell the user that the ambiguous matches
+ -- are for a wrong parent, then that there is a name clash,
+ -- see (#24452). Also since `gres` is NonEmpty and is a sub-list
+ -- of `original_gres` we are sure the original list is NonEmpty.
+ make_incorrect_parent_error parent rdr_name (NE.fromList original_gres)
+{-# INLINEABLE lookupSubBndrOccOnTypeClass #-}
- | otherwise = do
+-- | Used in export lists to lookup the children.
+lookupSubBndrOccOnExportList :: DeprecationWarnings
+ -> Name -- ^ Parent
+ -> RdrName -- ^ thing we are looking up
+ -> LookupChild -- ^ how to look it up (e.g. which
+ -- 'NameSpace's to look in)
+ -> RnM ChildLookupResult
+lookupSubBndrOccOnExportList warn_if_deprec parent rdr_name how_lkup =
+ if isUnboundName parent
+ -- Avoid an error cascade, see Note [ Unbound vs Ambiguous Names ]
+ then return (FoundChild (mkUnboundGRERdr rdr_name))
+ else do
+ traceTc "lookupSubBndrOccOnExportList" (vcat [])
+ (picked_gres, original_gres) <- lookupSubBndrOcc_helper parent rdr_name how_lkup
+ case picked_gres of
+ NoOccurrence -> do
+ no_matching_parent_error parent rdr_name original_gres
+ NoParentOccurrence g -> do
+ mark_used_found_child warn_if_deprec g
+ MatchingParentOccurrence g -> do
+ liftIO $ putStrLn "DisambigOccurence ExportList"
+ traceTc "DisambigOccurence ExportList" (vcat [])
+ mark_used_found_child warn_if_deprec g
+ AmbiguousOccurrence gres -> do
+ gres_name_clash_error rdr_name gres -- it seems odd this is used here too
+{-# INLINEABLE lookupSubBndrOccOnExportList #-}
+
+-- Used to lookup names on GRE for export lists and type classes
+lookupSubBndrOcc_helper :: Name -- Parent
+ -> RdrName -- ^ thing we are looking up
+ -> LookupChild -- ^ how to look it up (e.g. which
+ -- 'NameSpace's to look in)
+ -> RnM (DisambigInfo, [GlobalRdrEltX GREInfo])
+lookupSubBndrOcc_helper parent rdr_name how_lkup = do
gre_env <- getGlobalRdrEnv
let original_gres = lookupGRE gre_env (LookupChildren (rdrNameOcc rdr_name) how_lkup)
picked_gres = pick_gres original_gres
-- The remaining GREs are things that we *could* export here.
- -- Note that this includes things which have `NoParent`;
- -- those are sorted in `checkPatSynParent`.
- traceTc "parent" (ppr parent)
- traceTc "lookupExportChild must_have_parent:" (ppr must_have_parent)
+ -- Note that this includes things which have 'NoParent';
+ -- those are sorted in 'checkPatSynParent'.
traceTc "lookupExportChild original_gres:" (ppr original_gres)
traceTc "lookupExportChild picked_gres:" (ppr picked_gres)
- case picked_gres of
- NoOccurrence ->
- noMatchingParentErr original_gres
- UniqueOccurrence g ->
- if must_have_parent
- then noMatchingParentErr original_gres
- else checkFld g
- DisambiguatedOccurrence g ->
- checkFld g
- AmbiguousOccurrence gres ->
- if must_have_parent
- -- It is more helpful to tell the user that the ambiguous matches
- -- are for a wrong parent, then that there is a name clash,
- -- see (#24452). Also since `gres` is NonEmpty and is a sub-list
- -- of `original_gres` we are sure the original list is NonEmpty.
- then mkIncorrectParentErr (NE.fromList original_gres)
- else mkNameClashErr gres
- where
- checkFld :: GlobalRdrElt -> RnM ChildLookupResult
- checkFld g = do
- addUsedGRE warn_if_deprec g
- return $ FoundChild g
-
- -- Called when we find no matching GREs after disambiguation but
- -- there are three situations where this happens.
- -- 1. There were none to begin with.
- -- 2. None of the matching ones were the parent but
- -- a. They were from an overloaded record field so we can report
- -- a better error.
- -- b. The original lookup was actually ambiguous.
- -- For example, the case where overloading is off and two
- -- record fields are in scope from different record
- -- constructors, neither of which is the parent.
- noMatchingParentErr :: [GlobalRdrElt] -> RnM ChildLookupResult
- noMatchingParentErr original_gres = do
- traceRn "noMatchingParentErr" (ppr original_gres)
- dup_fields_ok <- xoptM LangExt.DuplicateRecordFields
- case original_gres of
- [] -> return NameNotFound
- [g] -> mkIncorrectParentErr (NE.fromList [g])
- gss@(g:gss'@(_:_)) ->
- if dup_fields_ok && all isRecFldGRE gss
- then mkIncorrectParentErr (NE.fromList gss)
- else mkNameClashErr $ g NE.:| gss'
-
- mkIncorrectParentErr :: NE.NonEmpty GlobalRdrElt -> RnM ChildLookupResult
- mkIncorrectParentErr gres = return $ IncorrectParent parent (NE.head gres)
- [p | x <- NE.toList gres, ParentIs p <- [greParent x]]
-
- mkNameClashErr :: NE.NonEmpty GlobalRdrElt -> RnM ChildLookupResult
- mkNameClashErr gres = do
- addNameClashErrRn rdr_name gres
- return (FoundChild (NE.head gres))
-
- pick_gres :: [GlobalRdrElt] -> DisambigInfo
- -- For Unqual, find GREs that are in scope qualified or unqualified
- -- For Qual, find GREs that are in scope with that qualification
- pick_gres gres
- | isUnqual rdr_name
- = mconcat (map right_parent gres)
- | otherwise
- = mconcat (map right_parent (pickGREs rdr_name gres))
-
- right_parent :: GlobalRdrElt -> DisambigInfo
- right_parent gre
- = case greParent gre of
- ParentIs cur_parent
- | parent == cur_parent -> DisambiguatedOccurrence gre
- | otherwise -> NoOccurrence
- NoParent -> UniqueOccurrence gre
-{-# INLINEABLE lookupSubBndrOcc_helper #-}
+ return (picked_gres, original_gres)
+ where
+ -- We are looking for a single matching parent occurrences, and multiple of those
+ -- occurrences should be presented as an ambiguous error. After that, we are satisfied
+ -- with a single NoParentOccurrence. If there are no occurences whatsoever we will report
+ -- NoOccurence.
+ --
+ -- To report the most precise error, we either report matching parent conflicts or no parent conflicts
+ -- but never both together.
+ pick_gres :: [GlobalRdrElt] -> DisambigInfo
+ pick_gres gres
+ | length matching_parent_gres == 1 = MatchingParentOccurrence $ head matching_parent_gres
+ | length no_parent_gres == 1 = NoParentOccurrence $ head no_parent_gres
+ | null no_parent_gres && null matching_parent_gres = NoOccurrence
+ | not $ null matching_parent_gres = AmbiguousOccurrence (NE.fromList matching_parent_gres)
+ | otherwise = AmbiguousOccurrence (NE.fromList no_parent_gres) -- which cannot be empty due to the above 2 conditions
+ where
+ resolved_gres = resolve_gres rdr_name gres
+ (matching_parent_gres, no_parent_gres) = partition_gres resolved_gres
+
+ -- foldr preserves the order of the errors as they appear in the source
+ partition_gres :: [DisambigInfo] -> ([GlobalRdrElt], [GlobalRdrElt])
+ partition_gres = foldr (flip separate_gres) ([], [])
+
+ -- We prefer disambiguated then unique occurrences, so we separate then so we can decide based on those
+ -- occurrences separately.
+ separate_gres :: ([GlobalRdrElt], [GlobalRdrElt]) -> DisambigInfo -> ([GlobalRdrElt], [GlobalRdrElt])
+ separate_gres (matching_parent_gres, no_parent_gres) (MatchingParentOccurrence g) = (g:matching_parent_gres, no_parent_gres)
+ separate_gres (matching_parent_gres, no_parent_gres) (NoParentOccurrence g) = (matching_parent_gres, g:no_parent_gres)
+ separate_gres acc _ = acc
+
+ -- For Unqual, find GREs that are in scope qualified or unqualified
+ -- For Qual, find GREs that are in scope with that qualification
+ resolve_gres :: RdrName -> [GlobalRdrElt] -> [DisambigInfo]
+ resolve_gres rdr_name gres
+ | isUnqual rdr_name = map right_parent gres
+ | otherwise = map right_parent (pickGREs rdr_name gres)
+
+ right_parent :: GlobalRdrElt -> DisambigInfo
+ right_parent gre
+ = case greParent gre of
+ ParentIs cur_parent
+ | parent == cur_parent -> MatchingParentOccurrence gre
+ | otherwise -> NoOccurrence
+ NoParent -> NoParentOccurrence gre
+
+-- Called when we find no matching GREs after disambiguation but
+-- there are three situations where this happens.
+-- 1. There were none to begin with.
+-- 2. None of the matching ones were the parent but
+-- a. They were from an overloaded record field so we can report
+-- a better error.
+-- b. The original lookup was actually ambiguous.
+-- For example, the case where overloading is off and two
+-- record fields are in scope from different record
+-- constructors, neither of which is the parent.
+no_matching_parent_error :: Name -> RdrName -> [GlobalRdrEltX GREInfo] -> RnM ChildLookupResult
+no_matching_parent_error parent rdr_name original_gres = do
+ traceRn "no_matching_parent_error" (ppr original_gres)
+ dup_fields_ok <- xoptM LangExt.DuplicateRecordFields
+ case original_gres of
+ [] -> return NameNotFound
+ [g] -> make_incorrect_parent_error parent rdr_name (NE.fromList [g])
+ gss@(g:gss'@(_:_)) ->
+ if dup_fields_ok && all isRecFldGRE gss
+ then make_incorrect_parent_error parent rdr_name (NE.fromList gss)
+ else gres_name_clash_error rdr_name $ g NE.:| gss'
+
+gres_name_clash_error :: RdrName -> NE.NonEmpty GlobalRdrElt -> RnM ChildLookupResult
+gres_name_clash_error rdr_name gres = do
+ addNameClashErrRn rdr_name gres
+ return (FoundChild (NE.head gres))
+
+make_incorrect_parent_error :: Name -> RdrName -> NE.NonEmpty (GlobalRdrEltX info) -> RnM ChildLookupResult
+make_incorrect_parent_error parent rdr_name gres = return $ IncorrectParent parent (mkUnboundGRERdr rdr_name)
+ [p | x <- NE.toList gres, ParentIs p <- [greParent x]]
+
+mark_used_found_child :: DeprecationWarnings -> GlobalRdrElt -> RnM ChildLookupResult
+mark_used_found_child warn_if_deprec g = do
+ addUsedGRE warn_if_deprec g
+ return $ FoundChild g
-- | This domain specific datatype is used to record why we decided it was
-- possible that a GRE could be exported with a parent.
data DisambigInfo
= NoOccurrence
-- ^ The GRE could not be found, or it has the wrong parent.
- | UniqueOccurrence GlobalRdrElt
+ | NoParentOccurrence GlobalRdrElt
-- ^ The GRE has no parent. It could be a pattern synonym.
- | DisambiguatedOccurrence GlobalRdrElt
+ | MatchingParentOccurrence GlobalRdrElt
-- ^ The parent of the GRE is the correct parent.
| AmbiguousOccurrence (NE.NonEmpty GlobalRdrElt)
-- ^ The GRE is ambiguous.
@@ -790,31 +885,10 @@ data DisambigInfo
instance Outputable DisambigInfo where
ppr NoOccurrence = text "NoOccurrence"
- ppr (UniqueOccurrence gre) = text "UniqueOccurrence:" <+> ppr gre
- ppr (DisambiguatedOccurrence gre) = text "DiambiguatedOccurrence:" <+> ppr gre
+ ppr (NoParentOccurrence gre) = text "UniqueOccurrence:" <+> ppr gre
+ ppr (MatchingParentOccurrence gre) = text "MatchingParentOccurence:" <+> ppr gre
ppr (AmbiguousOccurrence gres) = text "Ambiguous:" <+> ppr gres
-instance Semi.Semigroup DisambigInfo where
- -- These are the key lines: we prefer disambiguated occurrences to other
- -- names.
- _ <> DisambiguatedOccurrence g' = DisambiguatedOccurrence g'
- DisambiguatedOccurrence g' <> _ = DisambiguatedOccurrence g'
-
- NoOccurrence <> m = m
- m <> NoOccurrence = m
- UniqueOccurrence g <> UniqueOccurrence g'
- = AmbiguousOccurrence $ g NE.:| [g']
- UniqueOccurrence g <> AmbiguousOccurrence gs
- = AmbiguousOccurrence (g `NE.cons` gs)
- AmbiguousOccurrence gs <> UniqueOccurrence g'
- = AmbiguousOccurrence (g' `NE.cons` gs)
- AmbiguousOccurrence gs <> AmbiguousOccurrence gs'
- = AmbiguousOccurrence (gs Semi.<> gs')
-
-instance Monoid DisambigInfo where
- mempty = NoOccurrence
- mappend = (Semi.<>)
-
-- Lookup SubBndrOcc can never be ambiguous
--
-- Records the result of looking up a child.
@@ -835,28 +909,6 @@ instance Outputable ChildLookupResult where
= text "IncorrectParent"
<+> hsep [ppr p, ppr $ greName g, ppr ns]
-lookupSubBndrOcc :: DeprecationWarnings
- -> Name -- Parent
- -> SDoc
- -> RdrName
- -> RnM (Either NotInScopeError Name)
--- ^ Find all the things the 'RdrName' maps to,
--- and pick the one with the right 'Parent' 'Name'.
-lookupSubBndrOcc warn_if_deprec the_parent doc rdr_name =
- lookupExactOrOrig rdr_name (Right . greName) $
- -- This happens for built-in classes, see mod052 for example
- do { child <- lookupSubBndrOcc_helper True warn_if_deprec the_parent rdr_name what_lkup
- ; return $ case child of
- FoundChild g -> Right (greName g)
- NameNotFound -> Left (UnknownSubordinate doc)
- IncorrectParent {} -> Left (UnknownSubordinate doc) }
- -- See [Mismatched class methods and associated type families]
- -- in TcInstDecls.
- where
- what_lkup = LookupChild { wantedParent = the_parent
- , lookupDataConFirst = False
- , prioritiseParent = True -- See T23664.
- }
{-
Note [Family instance binders]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
=====================================
compiler/GHC/Tc/Gen/Export.hs
=====================================
@@ -698,8 +698,8 @@ lookupChildrenExport spec_parent rdr_items = mapAndReportM doOne rdr_items
, prioritiseParent = False -- See T11970.
}
- -- Do not report export list declaration deprecations
- name <- lookupSubBndrOcc_helper False ExportDeprecationWarnings
+ -- Do not report export list declaration deprecations
+ name <- lookupSubBndrOccOnExportList ExportDeprecationWarnings
spec_parent bareName what_lkup
traceRn "lookupChildrenExport" (ppr name)
-- Default to data constructors for slightly better error
=====================================
compiler/GHC/Types/Name/Reader.hs
=====================================
@@ -1265,13 +1265,15 @@ greIsRelevant which_gres ns gre
{- Note [childGREPriority]
~~~~~~~~~~~~~~~~~~~~~~~~~~
There are currently two places in the compiler where we look up GlobalRdrElts
-which have a given Parent. These are the two calls to lookupSubBndrOcc_helper:
+which have a given Parent.
- A. Looking up children in an export item, e.g.
+ A. lookupSubBndrOccOnExportList looks up children in an export item, e.g.
module M ( T(MkT, D) ) where { data T = MkT; data D = D }
- B. Looking up binders in a class or instance declaration, e.g.
+ B. lookupSubBndrOccOnTypeClass looks up binders in a class or
+ instance declaration, e.g.
+
the operator +++ in the fixity declaration:
class C a where { type (+++) :: a -> a ->; infixl 6 +++ }
=====================================
testsuite/tests/rename/T25014/Ambig1.hs
=====================================
@@ -0,0 +1,5 @@
+-- A module that is ambiguous with Ambig2
+{-# LANGUAGE TypeFamilies #-}
+module Ambig1 where
+ data family T a
+ data instance T Bool = MkT
=====================================
testsuite/tests/rename/T25014/Ambig2.hs
=====================================
@@ -0,0 +1,5 @@
+-- A module that is ambiguous with Ambig1
+{-# LANGUAGE TypeFamilies #-}
+module Ambig2 where
+ import Ambig1 (T)
+ data instance T Int = MkT
=====================================
testsuite/tests/rename/T25014/T25014a.hs
=====================================
@@ -0,0 +1,5 @@
+-- Should not compile as it is unclear what gets exported
+module T25014a (T(MkT)) where
+ import Ambig1 (T(MkT))
+ import Ambig2 (T(MkT))
+ data S
=====================================
testsuite/tests/rename/T25014/T25014a.stderr
=====================================
@@ -0,0 +1,10 @@
+T25014a.hs:2:17: [GHC-87543]
+ Ambiguous occurrence ‘MkT’.
+ It could refer to
+ either ‘Ambig1.MkT’,
+ imported from ‘Ambig1’ at T25014a.hs:3:18-23
+ (and originally defined at Ambig1.hs:5:26-28),
+ or ‘Ambig2.MkT’,
+ imported from ‘Ambig2’ at T25014a.hs:4:18-23
+ (and originally defined at Ambig2.hs:5:25-27).
+ In the export: T(MkT)
\ No newline at end of file
=====================================
testsuite/tests/rename/T25014/T25014b.hs
=====================================
@@ -0,0 +1,8 @@
+-- Should not compile trying to export a missing name
+module T25014b (A (foo)) where
+
+data A
+
+data B = B {
+ foo :: Int
+}
=====================================
testsuite/tests/rename/T25014/T25014b.stderr
=====================================
@@ -0,0 +1,4 @@
+T25014b.hs:2:17: error: [GHC-45510]
+ • Term variable ‘foo’ cannot be used here
+ (term variables cannot be promoted)
+ • In the export: A(foo)
\ No newline at end of file
=====================================
testsuite/tests/rename/T25014/T25014c.hs
=====================================
@@ -0,0 +1,8 @@
+-- Should not compile trying to export a name for the wrong parent
+module T25014b (A (foo)) where
+
+data A
+
+data B = B {
+ foo :: Int
+}
=====================================
testsuite/tests/rename/T25014/T25014c.stderr
=====================================
@@ -0,0 +1,4 @@
+T25014c.hs:2:17: [GHC-45510]
+ Term variable ‘foo’ cannot be used here
+ (term variables cannot be promoted)
+ In the export: A(foo)
\ No newline at end of file
=====================================
testsuite/tests/rename/T25014/T25014d.hs
=====================================
@@ -0,0 +1,6 @@
+-- Should not compile trying to export a name with the wrong parent
+module T25014b (A (foo)) where
+
+data A
+
+foo = 1
=====================================
testsuite/tests/rename/T25014/T25014d.stderr
=====================================
@@ -0,0 +1,4 @@
+T25014d.hs:2:17: [GHC-88993]
+ The type constructor ‘A’ is not the parent of the identifier ‘foo’.
+ Identifiers can only be exported with their parent type constructor.
+ In the export: A(foo)
\ No newline at end of file
=====================================
testsuite/tests/rename/T25014/all.T
=====================================
@@ -0,0 +1,4 @@
+test('T25014a', [extra_files(['Ambig1.hs', 'Ambig2.hs'])], multimod_compile_fail, ['T25014a','-v0'])
+test('T25014b', [], compile_fail, [''])
+test('T25014c', [], compile_fail, [''])
+test('T25014d', [], compile_fail, [''])
\ No newline at end of file
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/cf81fceabd2ed0b0089d308507ce700fb4846729
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