[project @ 2000-10-24 07:35:00 by simonpj]

[ghc-hetmet.git] / ghc / compiler / rename / RnBinds.lhs

diff --git a/ghc/compiler/rename/RnBinds.lhs b/ghc/compiler/rename/RnBinds.lhs
index c3c31c0..f27407a 100644 (file)
--- a/ghc/compiler/rename/RnBinds.lhs
+++ b/ghc/compiler/rename/RnBinds.lhs
@@ -27,20 +27,19 @@ import RnHsSyn
 import RnMonad
 import RnExpr          ( rnMatch, rnGRHSs, rnPat, checkPrecMatch )
 import RnEnv           ( bindLocatedLocalsRn, lookupBndrRn, 
-                         lookupGlobalOccRn, lookupOccRn, lookupSigOccRn,
-                         warnUnusedLocalBinds, mapFvRn, 
-                         FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV,
-                         unknownNameErr
+                         lookupGlobalOccRn, lookupSigOccRn,
+                         warnUnusedLocalBinds, mapFvRn, extendTyVarEnvFVRn,
+                         FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV
                        )
-import CmdLineOpts     ( opt_WarnMissingSigs )
+import CmdLineOpts     ( DynFlag(..) )
 import Digraph         ( stronglyConnComp, SCC(..) )
-import Name            ( OccName, Name, nameOccName, mkUnboundName, isUnboundName )
+import Name            ( OccName, Name, nameOccName )
 import NameSet
-import RdrName         ( RdrName, rdrNameOcc  )
-import BasicTypes      ( RecFlag(..), TopLevelFlag(..) )
+import RdrName         ( RdrName, rdrNameOcc )
+import BasicTypes      ( RecFlag(..) )
 import List            ( partition )
-import Bag             ( bagToList )
 import Outputable
+import PrelNames       ( isUnboundName )
 \end{code}
 
 -- ToDo: Put the annotations into the monad, so that they arrive in the proper
@@ -170,18 +169,20 @@ rnTopMonoBinds mbinds sigs
     let
        bndr_name_set = mkNameSet binder_names
     in
-    renameSigs (okBindSig bndr_name_set) sigs `thenRn` \ (siglist, sig_fvs) ->
+    renameSigs (okBindSig bndr_name_set) sigs  `thenRn` \ (siglist, sig_fvs) ->
+    doptRn Opt_WarnMissingSigs                 `thenRn` \ warnMissing ->
     let
        type_sig_vars   = [n | Sig n _ _ <- siglist]
-       un_sigd_binders | opt_WarnMissingSigs = nameSetToList (delListFromNameSet bndr_name_set type_sig_vars)
-                       | otherwise           = []
+       un_sigd_binders | warnMissing = nameSetToList (delListFromNameSet 
+                                                          bndr_name_set type_sig_vars)
+                       | otherwise   = []
     in
     mapRn_ (addWarnRn.missingSigWarn) un_sigd_binders  `thenRn_`
 
     rn_mono_binds siglist mbinds                  `thenRn` \ (final_binds, bind_fvs) ->
     returnRn (final_binds, bind_fvs `plusFV` sig_fvs)
   where
-    binder_rdr_names = map fst (bagToList (collectMonoBinders mbinds))
+    binder_rdr_names = collectMonoBinders mbinds
 \end{code}
 
 %************************************************************************
@@ -247,7 +248,7 @@ rnMonoBinds mbinds sigs     thing_inside -- Non-empty monobinds
     warnUnusedLocalBinds unused_binders        `thenRn_`
     returnRn (result, delListFromNameSet all_fvs new_mbinders)
   where
-    mbinders_w_srclocs = bagToList (collectMonoBinders mbinds)
+    mbinders_w_srclocs = collectLocatedMonoBinders mbinds
 \end{code}
 
 
@@ -365,27 +366,40 @@ in many ways the @op@ in an instance decl is just like an occurrence, not
 a binder.
 
 \begin{code}
-rnMethodBinds :: RdrNameMonoBinds -> RnMS (RenamedMonoBinds, FreeVars)
+rnMethodBinds :: [Name]                        -- Names for generic type variables
+             -> RdrNameMonoBinds
+             -> RnMS (RenamedMonoBinds, FreeVars)
 
-rnMethodBinds EmptyMonoBinds = returnRn (EmptyMonoBinds, emptyFVs)
+rnMethodBinds gen_tyvars EmptyMonoBinds = returnRn (EmptyMonoBinds, emptyFVs)
 
-rnMethodBinds (AndMonoBinds mb1 mb2)
-  = rnMethodBinds mb1  `thenRn` \ (mb1', fvs1) ->
-    rnMethodBinds mb2  `thenRn` \ (mb2', fvs2) ->
+rnMethodBinds gen_tyvars (AndMonoBinds mb1 mb2)
+  = rnMethodBinds gen_tyvars mb1       `thenRn` \ (mb1', fvs1) ->
+    rnMethodBinds gen_tyvars mb2       `thenRn` \ (mb2', fvs2) ->
     returnRn (mb1' `AndMonoBinds` mb2', fvs1 `plusFV` fvs2)
 
-rnMethodBinds (FunMonoBind name inf matches locn)
+rnMethodBinds gen_tyvars (FunMonoBind name inf matches locn)
   = pushSrcLocRn locn                                  $
 
     lookupGlobalOccRn name                             `thenRn` \ sel_name -> 
        -- We use the selector name as the binder
 
-    mapFvRn rnMatch matches                            `thenRn` \ (new_matches, fvs) ->
+    mapFvRn rn_match matches                           `thenRn` \ (new_matches, fvs) ->
     mapRn_ (checkPrecMatch inf sel_name) new_matches   `thenRn_`
     returnRn (FunMonoBind sel_name inf new_matches locn, fvs `addOneFV` sel_name)
+  where
+       -- Gruesome; bring into scope the correct members of the generic type variables
+       -- See comments in RnSource.rnDecl(ClassDecl)
+    rn_match match@(Match _ (TypePatIn ty : _) _ _)
+       = extendTyVarEnvFVRn gen_tvs (rnMatch match)
+       where
+         tvs     = map rdrNameOcc (extractHsTyRdrNames ty)
+         gen_tvs = [tv | tv <- gen_tyvars, nameOccName tv `elem` tvs] 
+
+    rn_match match = rnMatch match
+       
 
 -- Can't handle method pattern-bindings which bind multiple methods.
-rnMethodBinds mbind@(PatMonoBind other_pat _ locn)
+rnMethodBinds gen_tyvars mbind@(PatMonoBind other_pat _ locn)
   = pushSrcLocRn locn  $
     failWithRn (EmptyMonoBinds, emptyFVs) (methodBindErr mbind)
 \end{code}
@@ -497,7 +511,7 @@ renameSigs ok_sig sigs
 -- Doesn't seem worth much trouble to sort this.
 
 renameSig :: Sig RdrName -> RnMS (Sig Name, FreeVars)
-
+-- ClassOpSig is renamed elsewhere.
 renameSig (Sig v ty src_loc)
   = pushSrcLocRn src_loc $
     lookupSigOccRn v                           `thenRn` \ new_v ->