diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Environment-names-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Environment-names-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+// env.names() lists nonenumerable names in with-statement environments.
+
+var g = newGlobal();
+var dbg = Debugger(g);
+var hits = 0;
+g.h = function () {
+    var env = dbg.getNewestFrame().environment;
+    var names = env.names();
+    assertEq(names.indexOf("a") !== -1, true);
+
+    // FIXME: Bug 748592 - proxies don't correctly propagate JSITER_HIDDEN
+    //assertEq(names.indexOf("b") !== -1, true);
+    //assertEq(names.indexOf("isPrototypeOf") !== -1, true);
+    hits++;
+};
+g.eval("var obj = {a: 1};\n" +
+       "Object.defineProperty(obj, 'b', {value: 2});\n" +
+       "with (obj) h();");
+assertEq(hits, 1);