diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug884920.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug884920.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+// |jit-test| error:SyntaxError
+
+function testcase({}, a = b, ... x)  {
+  "use strict";
+  function f() { };
+  with ( f(3) );
+}