diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug827659-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug827659-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+function f() {
+    return y.byteOffset;
+}
+var y;
+for (var j = 0; j < 1; ++j) {
+    y = new Float32Array();
+}
+f();
+y = 0;
+assertEq(f(), undefined);
+assertEq(f(), undefined);