X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypes%2FType.lhs;h=fd817956d23356001bbb09a08291ae30696a8a14;hb=d0a4736028a4834f6ce643a0629c7b5f1f451d34;hp=d81278ab7922badf984b2d8f177e72353ac224f4;hpb=84923cc7de2a93c22a2f72daf9ac863959efae13;p=ghc-hetmet.git

diff --git a/compiler/types/Type.lhs b/compiler/types/Type.lhs
index d81278a..fd81795 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,
@@ -95,7 +95,7 @@ module Type (
 	substPred, substTyVar, substTyVars, substTyVarBndr, deShadowTy, lookupTyVar,
 
 	-- Pretty-printing
-	pprType, pprParendType, pprTyThingCategory, pprForAll,
+	pprType, pprParendType, pprTypeApp, pprTyThingCategory, pprForAll,
 	pprPred, pprTheta, pprThetaArrow, pprClassPred, pprKind, pprParendKind
     ) where
 
@@ -609,6 +609,16 @@ 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.  For example
+--  	e.g.  data T [a] = ...
+-- In that case we want to print `T [a]', where T is the family TyCon
+pprSourceTyCon tycon 
+  | Just (repTyCon, tys) <- tyConFamInst_maybe tycon
+  = ppr $ repTyCon `TyConApp` tys	       -- can't be FunTyCon
+  | otherwise
+  = ppr tycon
 \end{code}