diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-evalWithBindings-06.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-evalWithBindings-06.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// In evalWithBindings code, assignment to any name not in the bindings works just as in eval.
+var g = newGlobal();
+var dbg = new Debugger(g);
+dbg.onDebuggerStatement = function (frame) {
+    assertEq(frame.evalWithBindings("y = z; x = w;", {z: 2, w: 3}).return, 3);
+};
+g.eval("function f(x) { debugger; assertEq(x, 3); }");
+g.eval("var y = 0; f(0);");
+assertEq(g.y, 2);