1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/non262/Function/regress-178389.js b/js/src/tests/non262/Function/regress-178389.js
new file mode 100644
index 0000000000..e1735adf86
--- /dev/null
+++ b/js/src/tests/non262/Function/regress-178389.js
@@ -0,0 +1,26 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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 = 178389;
+var summary = 'Function.prototype.toSource should not override Function.prototype.toString';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+ 
+function f()
+{
+  var g = function (){};
+}
+
+expect = f.toString();
+
+Function.prototype.toSource = function () { return ''; };
+
+actual = f.toString();
+
+reportCompare(expect, actual, summary);