X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypes%2FFamInstEnv.lhs;h=7c06555cca7983a438ccb34b5553ea10c23f115c;hb=46b28f7bfdd535e9fe5217a1151bedfb2cc15472;hp=ee5558397ee9656279d0e48e0a683e0989fc280d;hpb=b15724ad3cae2a14c265683e8bb6f7d639dac251;p=ghc-hetmet.git

diff --git a/compiler/types/FamInstEnv.lhs b/compiler/types/FamInstEnv.lhs
index ee55583..7c06555 100644
--- a/compiler/types/FamInstEnv.lhs
+++ b/compiler/types/FamInstEnv.lhs
@@ -277,7 +277,7 @@ indexed synonyms and we don't want to slow that down by needless unification.
 
 \begin{code}
 lookupFamInstEnvUnify :: (FamInstEnv, FamInstEnv) -> TyCon -> [Type]
-	              -> [(FamInstMatch)]
+	              -> [(FamInstMatch, TvSubst)]
 lookupFamInstEnvUnify (pkg_ie, home_ie) fam tys
   | not (isOpenTyCon fam) 
   = []
@@ -318,7 +318,7 @@ lookupFamInstEnvUnify (pkg_ie, home_ie) fam tys
         case tcUnifyTys bind_fn tpl_tys tys of
 	    Just subst -> let rep_tys = substTyVars subst (tyConTyVars tycon)
                           in
-                          (item, rep_tys) : find rest
+                          ((item, rep_tys), subst) : find rest
 	    Nothing    -> find rest
 
 -- See explanation at @InstEnv.bind_fn@.