diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-evalWithBindings-05.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-evalWithBindings-05.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// evalWithBindings code can assign to the bindings.
+var g = newGlobal();
+var dbg = new Debugger(g);
+var hits = 0;
+dbg.onDebuggerStatement = function (frame) {
+    assertEq(frame.evalWithBindings("for (i = 0; i < 5; i++) {}  i;", {i: 10}).return, 5);
+    hits++;
+};
+
+g.eval("debugger;");
+assertEq("i" in g, false);
+assertEq(hits, 1);