X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypes%2FType.lhs;h=fd817956d23356001bbb09a08291ae30696a8a14;hb=1a1164f580d910ad41cb52a17c989cef02010dae;hp=147f54678b213394941f49d0e1cb7f14b4a24bb8;hpb=3548802de235eca280982270463db84910ee3748;p=ghc-hetmet.git

diff --git a/compiler/types/Type.lhs b/compiler/types/Type.lhs
index 147f546..fd81795 100644
--- a/compiler/types/Type.lhs
+++ b/compiler/types/Type.lhs
@@ -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
 
@@ -611,11 +611,14 @@ tyConOrigHead tycon = case tyConFamInst_maybe tycon of
 			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
+-- 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}