diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug660734.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug660734.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+if (Proxy.fix) {
+    var handler = { fix: function() { return []; } };
+    var p = Proxy.createFunction(handler, function(){}, function(){});
+    Proxy.fix(p);
+    new p();
+}