diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug980013.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug980013.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+
+x = new Uint8ClampedArray;
+x.__proto__ = {};
+Object.defineProperty(this, "y", {
+    get: function() {
+        return x.length;
+    }
+});
+assertEq(y, undefined);