diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/regress-bug720680.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/regress-bug720680.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// |jit-test| error: InternalError
+version(0);
+eval("\
+function TimeFromYear( y ) {}\
+addTestCase( -2208988800000 );\
+function addTestCase( t ) {\
+  var start = TimeFromYear((addTestCase(addTestCase << t, 0)));\
+    new TestCase( \
+                  SECTION,\
+                  '(new Date('+d+')).getUTCDay()',\
+                  WeekDay((d)),\
+                  (new Date(let ({ stop } = 'properties.length' )('/ab[c\\\n]/'))).getUTCDay() \
+                );\
+}\
+");