diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug605015.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug605015.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// |jit-test| error: TypeError 
+// don't assert
+
+print(this.watch("x",
+function() {
+  Object.defineProperty(this, "x", ({
+    get: (Int8Array)
+  }))
+}))(x = /x/)