diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testLetWithUnstableGlobal.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testLetWithUnstableGlobal.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+var q = [];
+for each (b in [0x3FFFFFFF, 0x3FFFFFFF, 0x3FFFFFFF]) {
+  for each (let e in [{}, {}, {}, "", {}]) { 
+    b = (b | 0x40000000) + 1;
+    q.push(b);
+  }
+}
+function testLetWithUnstableGlobal() {
+    return q.join(",");
+}
+assertEq(testLetWithUnstableGlobal(), "2147483648,-1073741823,-1073741822,-1073741821,-1073741820,2147483648,-1073741823,-1073741822,-1073741821,-1073741820,2147483648,-1073741823,-1073741822,-1073741821,-1073741820");