diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug687768.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug687768.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+
+expected = '1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,';
+function slice(a, b) {
+  return expected;
+}
+function f() {
+  var length = 4;
+  var index = 0;
+  function get3() {
+    if (length - index < 3)
+      return null;
+    return slice(index, ++index);
+  }
+  var bytes = null;
+  while (bytes = get3()) {  }
+}
+f();