diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/extensions/strict-function-toSource.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/extensions/strict-function-toSource.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+/*
+ * Bug 800407 - Functions defined with Function construcor
+ * do have strict mode when JSOPTION_STRICT_MODE is on.
+ */
+
+options("strict_mode");
+function testRunOptionStrictMode(str, arg, result) {
+    var strict_inner = new Function('return typeof this == "undefined";');
+    return strict_inner;
+}
+assertEq(eval(uneval(testRunOptionStrictMode()))(), true);
+
+if (typeof decompileBody !== "undefined") {
+    assertEq(decompileBody(new Function('x', 'return x*2;')).contains('\n"use strict"'), true);
+}
+
+reportCompare(true, true);