[project @ 2000-04-03 16:46:41 by simonpj]

* Minor wibble to type checker error message

* Make error messages come out to stderr (I'd switched
  to stdout temporarily when fighting the Dreaded Stderr Bug
  and forgot to change back)

ghc/compiler/typecheck/TcBinds.lhs

@@ -796,7 +796,7 @@ checkSigMatch top_lvl binder_names mono_ids sigs
 
     mk_dict_tys theta = map mkPredTy theta
 
-    sig_msg id = ptext SLIT("When checking the type signature for") <+> ppr id
+    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

ghc/compiler/typecheck/TcMonoType.lhs

@@ -38,7 +38,7 @@ import Type		( Type, PredType(..), ThetaType, UsageAnn(..),
 			  boxedTypeKind, unboxedTypeKind, tyVarsOfType,
 			  mkArrowKinds, getTyVar_maybe, getTyVar,
 		  	  tidyOpenType, tidyOpenTypes, tidyTyVar, tidyTyVars,
-			  tyVarsOfType, tyVarsOfTypes
+			  tyVarsOfType, tyVarsOfTypes, mkForAllTys
 			)
 import PprType		( pprConstraint, pprType )
 import Subst		( mkTopTyVarSubst, substTy )
@@ -688,9 +688,7 @@ sigCtxt when sig_tyvars sig_theta sig_tau tidy_env
 	(env1, tidy_sig_tyvars)  = tidyTyVars tidy_env sig_tyvars
 	(env2, tidy_sig_rho)	 = tidyOpenType env1 (mkRhoTy sig_theta sig_tau)
 	(env3, tidy_actual_tau)  = tidyOpenType env1 actual_tau
-	forall | null sig_tyvars = empty
-	       | otherwise	 = ptext SLIT("forall") <+> hsep (map ppr tidy_sig_tyvars) <> dot
-	msg = vcat [ptext SLIT("Signature type:    ") <+> forall <+> pprType tidy_sig_rho,
+	msg = vcat [ptext SLIT("Signature type:    ") <+> pprType (mkForAllTys tidy_sig_tyvars tidy_sig_rho),
 		    ptext SLIT("Type to generalise:") <+> pprType tidy_actual_tau,
 		    when
 		   ]

ghc/compiler/utils/Outputable.lhs

@@ -155,7 +155,7 @@ printSDoc d sty = printDoc PageMode stdout (d sty)
 -- I'm not sure whether the direct-IO approach of printDoc
 -- above is better or worse than the put-big-string approach here
 printErrs :: SDoc -> IO ()
-printErrs doc = printDoc PageMode stdout (final_doc user_style)
+printErrs doc = printDoc PageMode stderr (final_doc user_style)
 	      where
 		final_doc = doc 	-- $$ text ""
 		user_style = mkUserStyle (PartWay opt_PprUserLength)