diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/function-tosource-strict.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/function-tosource-strict.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function outer() {
+    "use strict";
+    function inner() {}
+    return inner;
+}
+assertEq(outer().toString().indexOf("use strict") != -1, true);
+function outer2() {
+    "use strict";
+    function inner() blah;
+    return inner;
+}
+assertEq(outer2().toString().indexOf("/* use strict */") != -1, true);