diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug877936-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug877936-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,5 @@
+rex = RegExp("()()()()()()()()()()(z)?(y)");
+a = ["sub"];
+a[230] = '' + "a"
+f = Function.apply(null, a);
+"xyz".replace(rex, f);