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diff --git a/js/src/tests/supporting/test262-shell.js b/js/src/tests/supporting/test262-shell.js
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+/* 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/. */
+
+/*
+ * The current crop of Test262 test cases that we run are expected to pass
+ * unless they crash or throw. (This isn't true for all Test262 test cases --
+ * for the ones marked @negative the logic is inverted. We'll have to deal with
+ * that concern eventually, but for now we're punting so we can run subsets of
+ * Test262 tests.)
+ */
+testPassesUnlessItThrows();
+
+/*
+ * Test262 function $ERROR throws an error with the message provided. Test262
+ * test cases call it to indicate failure.
+ */
+function $ERROR(msg)
+{
+ throw new Error("Test262 error: " + msg);
+}
+
+/*
+ * Test262 function $INCLUDE loads a file with support functions for the tests.
+ * This function is replaced in browser.js.
+ */
+function $INCLUDE(file)
+{
+ load("supporting/" + file);
+}
+
+/*
+ * Test262 function fnGlobalObject returns the global object.
+ */
+var fnGlobalObject = (function()
+{
+ var global = Function("return this")();
+ return function fnGlobalObject() { return global; };
+})();