diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug677587.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug677587.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// Binary: cache/js-dbg-64-f189dd6316eb-linux
+// Flags:
+//
+
+var g = newGlobal();
+g.eval("var a = {};");
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+var desc = gw.getOwnPropertyDescriptor("a");
+gw.defineProperty("b", desc);
+Debugger(g.a, g.b);