diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug632901.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug632901.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// don't crash when tracing
+function f(o) {
+    var prop = "arguments";
+    f[prop] = f[prop];
+}
+for(var i = 0; i < 50; i++) {
+    f();
+}
+