--- trunk/src/compiler/typechecker/util.sml	2010/08/06 14:07:20	241
+++ trunk/src/compiler/typechecker/util.sml	2010/08/06 15:25:03	242
@@ -160,7 +160,7 @@
 		in
 		  (mv'::mvs, MV.Map.insert(env, mv, mv'))
 		end
-	  val (mvs, env) = List.foldl instantiateVar ([], MV.Map.empty) mvs
+	  val (mvs, env) = List.foldr instantiateVar ([], MV.Map.empty) mvs
 	  fun iDiff (Ty.DiffVar(k, i)) = (case MV.Map.find(env, Ty.DIFF k)
 		 of SOME(Ty.DIFF k) => Ty.DiffVar(k, i)
 		  | _ => raise Fail "impossible"

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 		 of SOME(Ty.DIFF k) =&gt; Ty.DiffVar(k, i)
 		  | _ =&gt; raise Fail &quot;impossible&quot;</div>
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