diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testManyVars.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testManyVars.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+const MANY_VARS = Math.pow(2,17);
+
+var code = "function f1() {\n";
+code += "  var x0 = 0";
+for (var i = 1; i < MANY_VARS; i++)
+    code += ", x" + i + " = " + i;
+code += ";\n";
+for (var i = 0; i < MANY_VARS; i += 100)
+    code += "  assertEq(x" + i + ", " + i + ");\n";
+code += "  return x80000;\n";
+code += "}\n";
+eval(code);
+assertEq(f1(), 80000);