diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug836623.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug836623.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+
+x = []
+Object.defineProperty(x, 4, {
+    configurable: true
+})
+Array.prototype.pop.call(x)
+for (let y = 0; y < 9; ++y) {
+    Object.defineProperty(x, 7, {
+        configurable: true,
+        enumerable: (y != 2),
+        writable: true
+    })
+}