diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug620640.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug620640.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+// Binary: cache/js-dbg-32-38f985b0522c-linux
+// Flags: -j
+//
+var g;
+var e;
+var w;
+for each (a in this) { }
+d = 3;
+x = 3;
+for (var m = 0; m < 9; ++m) {}
+for each (var c in this) { }
+for each(let d in [
+  [],
+  [],
+  [],
+  function () {},
+  undefined
+]) {
+    for each(let f in [
+      [],
+      [],
+      true,
+      [],
+      true
+    ]) {}
+}