[project @ 2000-05-13 00:20:57 by lewie]

[ghc-hetmet.git] / ghc / compiler / typecheck / TcBinds.lhs

diff --git a/ghc/compiler/typecheck/TcBinds.lhs b/ghc/compiler/typecheck/TcBinds.lhs
index 69bde88..b252aca 100644 (file)
--- a/ghc/compiler/typecheck/TcBinds.lhs
+++ b/ghc/compiler/typecheck/TcBinds.lhs
@@ -44,7 +44,7 @@ import TcUnify                ( unifyTauTy, unifyTauTyLists )
 
 import PrelInfo                ( main_NAME, ioTyCon_NAME )
 
-import Id              ( Id, mkVanillaId, setInlinePragma )
+import Id              ( Id, mkVanillaId, setInlinePragma, idFreeTyVars )
 import Var             ( idType, idName )
 import IdInfo          ( setInlinePragInfo, InlinePragInfo(..) )
 import Name            ( Name, getName, getOccName, getSrcLoc )
@@ -54,7 +54,6 @@ import Type           ( mkTyVarTy, tyVarsOfTypes, mkTyConApp,
                          mkPredTy, splitRhoTy, mkForAllTy, isUnLiftedType, 
                          isUnboxedType, unboxedTypeKind, boxedTypeKind
                        )
-import PprType          ( {- instance Outputable Type -} )
 import FunDeps         ( tyVarFunDep, oclose )
 import Var             ( TyVar, tyVarKind )
 import VarSet
@@ -260,7 +259,10 @@ tcBindWithSigs top_lvl mbind tc_ty_sigs inline_sigs is_rec
        -- come before:
        --   - computing vars over which to quantify
        --   - zonking the generalized type vars
-    tcImprove lie_req `thenTc_`
+    let lie_avail = case maybe_sig_theta of
+                     Nothing      -> emptyLIE
+                     Just (_, la) -> la in
+    tcImprove (lie_avail `plusLIE` lie_req)                    `thenTc_`
 
        -- COMPUTE VARIABLES OVER WHICH TO QUANTIFY, namely tyvars_to_gen
        -- The tyvars_not_to_gen are free in the environment, and hence
@@ -767,10 +769,10 @@ checkSigMatch top_lvl binder_names mono_ids sigs
                      
        -- CHECK THAT THE SIGNATURE TYVARS AND TAU_TYPES ARE OK
        -- Doesn't affect substitution
-    check_one_sig (TySigInfo _ id sig_tyvars _ sig_tau _ _ src_loc)
+    check_one_sig (TySigInfo _ id sig_tyvars sig_theta sig_tau _ _ src_loc)
       = tcAddSrcLoc src_loc                                    $
-       tcAddErrCtxtM (sigCtxt (sig_msg id) (idType id))        $
-       checkSigTyVars sig_tyvars
+       tcAddErrCtxtM (sigCtxt (sig_msg id) sig_tyvars sig_theta sig_tau)       $
+       checkSigTyVars sig_tyvars (idFreeTyVars id)
 
 
        -- CHECK THAT ALL THE SIGNATURE CONTEXTS ARE UNIFIABLE
@@ -797,8 +799,7 @@ checkSigMatch top_lvl binder_names mono_ids sigs
 
     mk_dict_tys theta = map mkPredTy theta
 
-    sig_msg id tidy_ty = sep [ptext SLIT("When checking the type signature"),
-                             nest 4 (ppr id <+> dcolon <+> ppr tidy_ty)]
+    sig_msg id = ptext SLIT("When checking the type signature for") <+> quotes (ppr id)
 
        -- Search for Main.main in the binder_names, return corresponding mono_id
     find_main NotTopLevel binder_names mono_ids = Nothing