diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug607659.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug607659.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+var g = 0;
+Object.defineProperty(RegExp.prototype, 'test', { get:function() { ++g } });
+function f() {
+    for (var i = 0; i < 100; ++i)
+        /a/.exec('a');
+}
+f();
+assertEq(g, 0);