diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testWith.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testWith.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+
+// basic 'with' functionality
+
+var o = {foo: true};
+with(o) {
+    foo = 10;
+}
+assertEq(o.foo, 10);