diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_7/extensions/regress-387955-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_7/extensions/regress-387955-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,41 @@
+/* -*- 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 = 387955;
+var summary = 'Do not Crash [@ JS_CallTracer]';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  var f;
+
+  function gen(yield_at_least_once) {
+    let x = 11;
+    function y(){}
+    f = function(){ return x; };
+    if (yield_at_least_once)
+      yield;
+  }
+
+  for (var i in gen()) { }
+
+  if (f() !== 11)
+    throw "unexpected value of local x";
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}