Cover PredTy case in Type.tyFamInsts

[ghc-hetmet.git] / compiler / types / FamInstEnv.lhs

diff --git a/compiler/types/FamInstEnv.lhs b/compiler/types/FamInstEnv.lhs
index 983f737..ba96a55 100644 (file)
--- a/compiler/types/FamInstEnv.lhs
+++ b/compiler/types/FamInstEnv.lhs
@@ -23,7 +23,6 @@ module FamInstEnv (
 #include "HsVersions.h"
 
 import InstEnv
-import TcType
 import Unify
 import Type
 import TypeRep
@@ -88,16 +87,16 @@ instance Outputable FamInst where
 pprFamInst :: FamInst -> SDoc
 pprFamInst famInst
   = hang (pprFamInstHdr famInst)
-       2 (ptext SLIT("--") <+> pprNameLoc (getName famInst))
+       2 (ptext (sLit "--") <+> pprNameLoc (getName famInst))
 
 pprFamInstHdr :: FamInst -> SDoc
 pprFamInstHdr (FamInst {fi_fam = fam, fi_tys = tys, fi_tycon = tycon})
   = pprTyConSort <+> pprHead
   where
-    pprHead = pprTypeApp fam (ppr fam) tys
-    pprTyConSort | isDataTyCon tycon = ptext SLIT("data instance")
-                | isNewTyCon  tycon = ptext SLIT("newtype instance")
-                | isSynTyCon  tycon = ptext SLIT("type instance")
+    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"
 
 pprFamInsts :: [FamInst] -> SDoc
@@ -314,17 +313,11 @@ lookupFamInstEnvUnify (pkg_ie, home_ie) fam tys
                )
                -- Unification will break badly if the variables overlap
                -- They shouldn't because we allocate separate uniques for them
-        case tcUnifyTys bind_fn tpl_tys tys of
+        case tcUnifyTys instanceBindFun tpl_tys tys of
            Just subst -> let rep_tys = substTyVars subst (tyConTyVars tycon)
                           in
                           ((item, rep_tys), subst) : find rest
            Nothing    -> find rest
-
--- See explanation at @InstEnv.bind_fn@.
---
-bind_fn :: TyVar -> BindFlag
-bind_fn tv | isTcTyVar tv && isExistentialTyVar tv = Skolem
-          | otherwise                             = BindMe
 \end{code}
 
 %************************************************************************