diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug861419.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug861419.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+
+arguments = [];
+try {
+    arguments.toSource = (function() {
+        __proto__.y = x
+    })
+    y = this
+    print(x = 8)
+    a = arguments
+    for (v of this) {}
+} catch (e) {}
+function f() {
+  "HELLO " + y
+}
+f()
+f()
+y = 1[7]
+f()