[project @ 2000-06-28 21:54:06 by lewie]

Make it so that implicit params uniformly print with the `?' at the front
of the name.  Simon's last big commit re-arranged how interface files
were written, and implicit params were suddenly being written without the `?'.
This fixes both that bug, and Simon's concern that there were too many
different pretty printing functions for implicit params ;-)

ghc/compiler/hsSyn/HsTypes.lhs

@@ -156,7 +156,7 @@ instance (Outputable name) => Outputable (HsTyVarBndr name) where
 
 instance Outputable name => Outputable (HsPred name) where
     ppr (HsPClass clas tys) = ppr clas <+> hsep (map pprParendHsType tys)
-    ppr (HsPIParam n ty)    = hsep [{- char '?' <> -} ppr n, text "::", ppr ty]
+    ppr (HsPIParam n ty)    = hsep [char '?' <> ppr n, text "::", ppr ty]
 
 pprHsTyVarBndr :: Outputable name => name -> Kind -> SDoc
 pprHsTyVarBndr name kind | kind == boxedTypeKind = ppr name

ghc/compiler/types/PprType.lhs

@@ -69,7 +69,8 @@ pprParendKind = pprParendType
 
 pprPred :: PredType -> SDoc
 pprPred (Class clas tys) = pprConstraint clas tys
-pprPred (IParam n ty)    = hsep [ppr n, ptext SLIT("::"), ppr ty]
+pprPred (IParam n ty)    = hsep [ptext SLIT("?") <> ppr n,
+				 ptext SLIT("::"), ppr ty]
 
 pprConstraint :: Class -> [Type] -> SDoc
 pprConstraint clas tys = ppr clas <+> hsep (map pprParendType tys)
@@ -177,12 +178,9 @@ ppr_ty env ctxt_prec ty@(ForAllTy _ _)
     pp_tyvars = hsep (map (pBndr env LambdaBind) tyvars)
     
     ppr_theta []	= empty
-    ppr_theta theta     = parens (hsep (punctuate comma (map ppr_pred theta))) 
+    ppr_theta theta     = parens (hsep (punctuate comma (map (ppr_pred env) theta))) 
 			  <+> ptext SLIT("=>")
 
-    ppr_pred (Class clas tys) = ppr clas <+> hsep (map (ppr_ty env tYCON_PREC) tys)
-    ppr_pred (IParam n ty)    = hsep [{- char '?' <> -} ppr n, text "::",
-				      ppr_ty env tYCON_PREC ty]
 
 ppr_ty env ctxt_prec (FunTy ty1 ty2)
   = maybeParen ctxt_prec fUN_PREC (sep (ppr_ty env fUN_PREC ty1 : pp_rest ty2))