diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug673766.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug673766.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+function TestCase(n, d, e, a) {
+    this.name = n
+    this.description = d
+}
+function reportCompare(expected, actual, description) {
+    new TestCase
+}
+var actual = '';
+var expect = '';
+for (var i = 0; i < 2; ++i) reportCompare(expect, actual, ': 2');
+try {
+    ({
+        valueOf: gc
+    } - [])
+} catch (prop) {}
+function addThis() reportCompare(expect, actual, 'RegExp.multiline = 17');
+Object.defineProperty(Object.prototype, "name", {
+    set: function (newValue) {}
+});
+addThis()