diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug706795.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug706795.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+executed = false;
+Object.defineProperty(Object.prototype, 'x', { set: function() { executed = true; } });
+function A() {
+    this.x = 12;
+}
+new A();
+assertEq(executed, true);