diff options
Diffstat (limited to 'compiler/GHC/Rename/Fixity.hs')
| -rw-r--r-- | compiler/GHC/Rename/Fixity.hs | 45 |
1 files changed, 6 insertions, 39 deletions
diff --git a/compiler/GHC/Rename/Fixity.hs b/compiler/GHC/Rename/Fixity.hs index e45f3a5cdb..39462baf36 100644 --- a/compiler/GHC/Rename/Fixity.hs +++ b/compiler/GHC/Rename/Fixity.hs @@ -30,15 +30,11 @@ import GHC.Types.SourceText import GHC.Types.SrcLoc import GHC.Utils.Outputable -import GHC.Utils.Panic import GHC.Data.Maybe import GHC.Rename.Unbound -import Data.List (groupBy) -import Data.Function ( on ) - {- ********************************************************* * * @@ -184,39 +180,10 @@ lookupFixityRn_help' name occ lookupTyFixityRn :: LocatedN Name -> RnM Fixity lookupTyFixityRn = lookupFixityRn . unLoc --- | Look up the fixity of a (possibly ambiguous) occurrence of a record field --- selector. We use 'lookupFixityRn'' so that we can specify the 'OccName' as --- the field label, which might be different to the 'OccName' of the selector --- 'Name' if @DuplicateRecordFields@ is in use (#1173). If there are --- multiple possible selectors with different fixities, generate an error. -lookupFieldFixityRn :: AmbiguousFieldOcc GhcRn -> RnM Fixity -lookupFieldFixityRn (Unambiguous n lrdr) +-- | Look up the fixity of an occurrence of a record field selector. +-- We use 'lookupFixityRn'' so that we can specify the 'OccName' as +-- the field label, which might be different to the 'OccName' of the +-- selector 'Name' if @DuplicateRecordFields@ is in use (#1173). +lookupFieldFixityRn :: FieldOcc GhcRn -> RnM Fixity +lookupFieldFixityRn (FieldOcc n lrdr) = lookupFixityRn' n (rdrNameOcc (unLoc lrdr)) -lookupFieldFixityRn (Ambiguous _ lrdr) = get_ambiguous_fixity (unLoc lrdr) - where - get_ambiguous_fixity :: RdrName -> RnM Fixity - get_ambiguous_fixity rdr_name = do - traceRn "get_ambiguous_fixity" (ppr rdr_name) - rdr_env <- getGlobalRdrEnv - let elts = lookupGRE_RdrName rdr_name rdr_env - - fixities <- groupBy ((==) `on` snd) . zip elts - <$> mapM lookup_gre_fixity elts - - case fixities of - -- There should always be at least one fixity. - -- Something's very wrong if there are no fixity candidates, so panic - [] -> panic "get_ambiguous_fixity: no candidates for a given RdrName" - [ (_, fix):_ ] -> return fix - ambigs -> addErr (ambiguous_fixity_err rdr_name ambigs) - >> return (Fixity NoSourceText minPrecedence InfixL) - - lookup_gre_fixity gre = lookupFixityRn' (greMangledName gre) (greOccName gre) - - ambiguous_fixity_err rn ambigs - = vcat [ text "Ambiguous fixity for record field" <+> quotes (ppr rn) - , hang (text "Conflicts: ") 2 . vcat . - map format_ambig $ concat ambigs ] - - format_ambig (elt, fix) = hang (ppr fix) - 2 (pprNameProvenance elt) |