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diff --git a/js/src/tests/js1_5/Scope/regress-185485.js b/js/src/tests/js1_5/Scope/regress-185485.js
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+++ b/js/src/tests/js1_5/Scope/regress-185485.js
@@ -0,0 +1,129 @@
+/* -*- 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/. */
+
+/*
+ *
+ * Date:    16 Dec 2002
+ * SUMMARY: Testing |with (x) {function f() {}}| when |x.f| already exists
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=185485
+ *
+ * The idea is this: if |x| does not already have a property named |f|,
+ * a |with| statement cannot be used to define one. See, for example,
+ *
+ *       http://bugzilla.mozilla.org/show_bug.cgi?id=159849#c11
+ *       http://bugzilla.mozilla.org/show_bug.cgi?id=184107
+ *
+ *
+ * However, if |x| already has a property |f|, a |with| statement can be
+ * used to modify the value it contains:
+ *
+ *                 with (x) {f = 1;}
+ *
+ * This should work even if we use a |var| statement, like this:
+ *
+ *                 with (x) {var f = 1;}
+ *
+ * However, it should NOT work if we use a |function| statement, like this:
+ *
+ *                 with (x) {function f() {}}
+ *
+ * Instead, this should newly define a function f in global scope.
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=185485
+ *
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 185485;
+var summary = 'Testing |with (x) {function f() {}}| when |x.f| already exists';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+
+var x = { f:0, g:0 };
+
+with (x)
+{
+  f = 1;
+}
+status = inSection(1);
+actual = x.f;
+expect = 1;
+addThis();
+
+with (x)
+{
+  var f = 2;
+}
+status = inSection(2);
+actual = x.f;
+expect = 2;
+addThis();
+
+/*
+ * Use of a function statement under the with-block should not affect
+ * the local property |f|, but define a function |f| in global scope -
+ */
+with (x)
+{
+  function f() {}
+}
+status = inSection(3);
+actual = x.f;
+expect = 2;
+addThis();
+
+status = inSection(4);
+actual = typeof this.f;
+expect = 'function';
+addThis();
+
+
+/*
+ * Compare use of function expression instead of function statement.
+ * Note it is important that |x.g| already exists. Otherwise, this
+ * would newly define |g| in global scope -
+ */
+with (x)
+{
+  var g = function() {}
+}
+status = inSection(5);
+actual = x.g.toString();
+expect = (function () {}).toString();
+addThis();
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+}
+
+
+function test()
+{
+  enterFunc('test');
+  printBugNumber(BUGNUMBER);
+  printStatus(summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+
+  exitFunc ('test');
+}