X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FInst.lhs;h=e1f3fb77940b1df7bec85b33abee48174065126d;hb=ef6d82a4e1d4ba4884c322be85cff291e017f0e6;hp=3a419be8f8ac59d331dc9e182362063a1c51a6db;hpb=4e0c994eb1613c62e94069642d7acdb2e69b773b;p=ghc-hetmet.git

diff --git a/compiler/typecheck/Inst.lhs b/compiler/typecheck/Inst.lhs
index 3a419be..e1f3fb7 100644
--- a/compiler/typecheck/Inst.lhs
+++ b/compiler/typecheck/Inst.lhs
@@ -473,11 +473,9 @@ hasEqualities :: [EvVar] -> Bool
 -- Has a bunch of canonical constraints (all givens) got any equalities in it?
 hasEqualities givens = any (has_eq . evVarPred) givens
   where
-    has_eq (EqPred {}) 	    = True
-    has_eq (IParam {}) 	    = False
-    has_eq (ClassP cls tys) = any has_eq (substTheta subst (classSCTheta cls))
-      where
-        subst = zipOpenTvSubst (classTyVars cls) tys
+    has_eq (EqPred {}) 	     = True
+    has_eq (IParam {}) 	     = False
+    has_eq (ClassP cls _tys) = any has_eq (classSCTheta cls)
 
 ----------------
 tyVarsOfWanteds :: WantedConstraints -> TyVarSet