X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypes%2FType.lhs;h=147f54678b213394941f49d0e1cb7f14b4a24bb8;hb=3548802de235eca280982270463db84910ee3748;hp=d81278ab7922badf984b2d8f177e72353ac224f4;hpb=84923cc7de2a93c22a2f72daf9ac863959efae13;p=ghc-hetmet.git

diff --git a/compiler/types/Type.lhs b/compiler/types/Type.lhs
index d81278a..147f546 100644
--- a/compiler/types/Type.lhs
+++ b/compiler/types/Type.lhs
@@ -55,7 +55,7 @@ module Type (
 
 	-- Source types
 	predTypeRep, mkPredTy, mkPredTys,
-	tyConOrigHead,
+	tyConOrigHead, pprSourceTyCon,
 
 	-- Newtypes
 	splitRecNewType_maybe, newTyConInstRhs,
@@ -609,6 +609,13 @@ tyConOrigHead :: TyCon -> (TyCon, [Type])
 tyConOrigHead tycon = case tyConFamInst_maybe tycon of
 		        Nothing      -> (tycon, mkTyVarTys (tyConTyVars tycon))
 			Just famInst -> famInst
+
+-- Pretty prints a tycon, using the family instance in case of a
+-- representation tycon.
+pprSourceTyCon tycon | Just (repTyCon, tys) <- tyConFamInst_maybe tycon =
+  ppr $ repTyCon `TyConApp` tys	       -- can't be FunTyCon
+                     | otherwise                                        =
+  ppr tycon
 \end{code}