diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Environment-names-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Environment-names-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// env.names() on object environments ignores property names that are not identifiers.
+
+var g = newGlobal();
+var dbg = Debugger(g);
+var names;
+g.h = function () {
+    names = dbg.getNewestFrame().environment.names();
+};
+g.eval("var obj = {a: 1};\n" +
+       "with ({a: 1, '0xcafe': 2, ' ': 3, '': 4, '0': 5}) h();");
+assertEq(names.indexOf("a") !== -1, true);
+assertEq(names.indexOf("0xcafe"), -1);
+assertEq(names.indexOf(" "), -1);
+assertEq(names.indexOf(""), -1);
+assertEq(names.indexOf("0"), -1);