X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcType.lhs;h=636ee0ea696c012a1822aa3323ea2efafc3dea38;hb=3f1b316d7035c55cd712cd39a9981339bcef2e8c;hp=1d4d166e9ce6ca9f68c2b6d61e9963bd166fdf76;hpb=0d8da265dadfd9170800a60a7d1a59543da5a6f5;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcType.lhs b/compiler/typecheck/TcType.lhs
index 1d4d166..636ee0e 100644
--- a/compiler/typecheck/TcType.lhs
+++ b/compiler/typecheck/TcType.lhs
@@ -38,7 +38,7 @@ module TcType (
   isImmutableTyVar, isSkolemTyVar, isMetaTyVar, isBoxyTyVar, 
   isSigTyVar, isExistentialTyVar,  isTyConableTyVar,
   metaTvRef, 
-  isFlexi, isIndirect, 
+  isFlexi, isIndirect, isRuntimeUnk, isUnk,
 
   --------------------------------
   -- Builders
@@ -457,7 +457,7 @@ pprSkolTvBinding tv
     ppr_details (MetaTv (SigTv info) _) = ppr_skol info
     ppr_details (SkolemTv info)		= ppr_skol info
 
-    ppr_skol UnkSkol	    = empty	-- Unhelpful; omit
+    ppr_skol UnkSkol	    = ptext SLIT("is an unknown type variable")	-- Unhelpful
     ppr_skol RuntimeUnkSkol = ptext SLIT("is an unknown runtime type")
     ppr_skol info           = sep [ptext SLIT("is a rigid type variable bound by"),
 				   sep [pprSkolInfo info, 
@@ -556,6 +556,16 @@ isFlexi other     = False
 
 isIndirect (Indirect _) = True
 isIndirect other        = False
+
+isRuntimeUnk :: TyVar -> Bool
+isRuntimeUnk x | isTcTyVar x
+               , SkolemTv RuntimeUnkSkol <- tcTyVarDetails x = True
+               | otherwise = False
+
+isUnk :: TyVar -> Bool
+isUnk x | isTcTyVar x
+        , SkolemTv UnkSkol <- tcTyVarDetails x = True
+        | otherwise = False
 \end{code}