diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug647695.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug647695.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+try { let(x = Date(7), y = let(a = x)("")) {} } catch (e) {}
+
+try {
+with({
+    y: Float64Array
+})
+for each(let y in [y]) {}
+} catch (e) {}
+
+try { test(); } catch (e) {}
+function test() {
+    try {
+        var result, arguments = 'adddb', arguments;
+    } catch (ex) {}
+}