diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug594108.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug594108.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+var res;
+for (var i = 0; i < 10; i++) {
+    var re = /a(b)c/;
+    var b = (re.exec(""), v = re.exec("abc")) !== null;
+    assertEq(v[0], "abc");
+    assertEq(v[1], "b");
+}
+