Properly ppr InstEqs in wanteds of implication constraints

[ghc-hetmet.git] / compiler / basicTypes / RdrName.lhs

diff --git a/compiler/basicTypes/RdrName.lhs b/compiler/basicTypes/RdrName.lhs
index 3766b9f..558ed16 100644 (file)
--- a/compiler/basicTypes/RdrName.lhs
+++ b/compiler/basicTypes/RdrName.lhs
@@ -4,6 +4,13 @@
 %
 
 \begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
 module RdrName (
        RdrName(..),    -- Constructors exported only to BinIface
 
@@ -28,14 +35,15 @@ module RdrName (
        GlobalRdrEnv, emptyGlobalRdrEnv, mkGlobalRdrEnv, plusGlobalRdrEnv, 
        lookupGlobalRdrEnv, extendGlobalRdrEnv,
        pprGlobalRdrEnv, globalRdrEnvElts,
-       lookupGRE_RdrName, lookupGRE_Name, hideSomeUnquals,
+       lookupGRE_RdrName, lookupGRE_Name, getGRE_NameQualifier_maybes,
+        hideSomeUnquals,
 
        -- GlobalRdrElt, Provenance, ImportSpec
        GlobalRdrElt(..), isLocalGRE, unQualOK, qualSpecOK, unQualSpecOK,
        Provenance(..), pprNameProvenance,
        Parent(..), 
        ImportSpec(..), ImpDeclSpec(..), ImpItemSpec(..), 
-       importSpecLoc, importSpecModule
+       importSpecLoc, importSpecModule, isExplicitItem
   ) where 
 
 #include "HsVersions.h"
@@ -367,6 +375,11 @@ lookupGRE_Name env name
   = [ gre | gre <- lookupGlobalRdrEnv env (nameOccName name),
            gre_name gre == name ]
 
+getGRE_NameQualifier_maybes :: GlobalRdrEnv -> Name -> [Maybe [ModuleName]]
+getGRE_NameQualifier_maybes env
+  = map qualifier_maybe . map gre_prov . lookupGRE_Name env
+  where qualifier_maybe LocalDef       = Nothing
+        qualifier_maybe (Imported iss) = Just $ map (is_as . is_decl) iss 
 
 pickGREs :: RdrName -> [GlobalRdrElt] -> [GlobalRdrElt]
 -- Take a list of GREs which have the right OccName
@@ -540,6 +553,10 @@ importSpecLoc (ImpSpec _    item)   = is_iloc item
 importSpecModule :: ImportSpec -> ModuleName
 importSpecModule is = is_mod (is_decl is)
 
+isExplicitItem :: ImpItemSpec -> Bool
+isExplicitItem ImpAll                       = False
+isExplicitItem (ImpSome {is_explicit = exp}) = exp
+
 -- Note [Comparing provenance]
 -- Comparison of provenance is just used for grouping 
 -- error messages (in RnEnv.warnUnusedBinds)