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diff --git a/Test/dafny4/Bug100.dfy b/Test/dafny4/Bug100.dfy
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+// RUN: %dafny /compile:0 /autoTriggers:1 "%s" > "%t"
+// RUN: %diff "%s.expect" "%t"
+
+lemma lemma_ensures(x:int, RefineInt:int->int)
+    requires forall y :: RefineInt.requires(y);
+    ensures forall y :: RefineInt(y) + x == RefineInt(x) + y;
+
+function Identity(z:int) : int
+
+lemma test()
+{
+    var v,w:int;
+    lemma_ensures(w, Identity);
+    //var RefineInt := Identity;
+    //assert RefineInt(v) == Identity(v);
+    assert Identity(v) + w == Identity(w) + v;
+}
+
+
+
+
+
+