diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug686179.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug686179.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// Binary: cache/js-dbg-64-b31b25125429-linux
+// Flags: -m -n -a
+//
+
+(function () {
+  assertEquals = function assertEquals(expected, found, name_opt) {  };
+  assertTrue = function assertTrue(value, name_opt) {  };
+})();
+function f0() {}
+function f1(x) {}
+function test(f) {
+  assertTrue(null === (assertEquals).arguments);
+}
+test(f0);
+test(f1);