FIX #3405

diff --git a/compiler/types/FamInstEnv.lhs b/compiler/types/FamInstEnv.lhs
index de5c5a0..89fd193 100644 (file)
--- a/compiler/types/FamInstEnv.lhs
+++ b/compiler/types/FamInstEnv.lhs
@@ -92,10 +92,11 @@ pprFamInstHdr (FamInst {fi_fam = fam, fi_tys = tys, fi_tycon = tycon})
   = pprTyConSort <+> pprHead
   where
     pprHead = pprTypeApp fam tys
-    pprTyConSort | isDataTyCon tycon = ptext (sLit "data instance")
-                | isNewTyCon  tycon = ptext (sLit "newtype instance")
-                | isSynTyCon  tycon = ptext (sLit "type instance")
-                | otherwise         = panic "FamInstEnv.pprFamInstHdr"
+    pprTyConSort | isDataTyCon     tycon = ptext (sLit "data instance")
+                | isNewTyCon      tycon = ptext (sLit "newtype instance")
+                | isSynTyCon      tycon = ptext (sLit "type instance")
+                | isAbstractTyCon tycon = ptext (sLit "data instance")
+                | otherwise             = panic "FamInstEnv.pprFamInstHdr"
 
 pprFamInsts :: [FamInst] -> SDoc
 pprFamInsts finsts = vcat (map pprFamInst finsts)