diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug819611.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug819611.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+// |jit-test| ion-eager
+x = [0, 0]
+Object.freeze(x).map(function() {
+    x.length = 6
+})
+assertEq(x.length,2);