diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_7/regress/regress-406477.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_7/regress/regress-406477.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 406477;
+var summary = 'eval of function x() in a function with an argument "x" and "let x"';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  function test2(x, src)
+  {
+    var y = 1;
+    {
+      let x = 2;
+      let y = 2;
+      eval(src);
+    }
+    return [x, y];
+  }
+
+  var expect = actual = '';
+
+  var [test_param_result, test_var_result] =
+    test2(1, "function x() { }\nfunction y() { }\n");
+
+  if (typeof test_param_result != "function")
+    actual += "Unexpected test_param_result value: "+uneval(test_param_result)+"\n";
+
+  if (typeof test_var_result != "function")
+    actual += "Unexpected test_var_result value: "+uneval(test_var_result)+"\n";
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}