diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/arrow-functions/strict-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/arrow-functions/strict-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// code in arrow function default arguments is strict if the body is strict
+
+load(libdir + "asserts.js");
+
+assertThrowsInstanceOf(
+    () => Function("(a = function (obj) { with (obj) f(); }) => { 'use strict'; }"),
+    SyntaxError);
+
+assertThrowsInstanceOf(
+    () => Function("(a = obj => { with (obj) f(); }) => { 'use strict'; }"),
+    SyntaxError);