text: // Copyright 2009 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  // Make sure that eval can introduce a local variable called __proto__.
  // See http://code.google.com/p/v8/issues/detail?id=186
  
  var setterCalled = false;
  
  var o = {};
  o.__defineSetter__("x", function() { setterCalled = true; });
  
  function runTest(test) {
    setterCalled = false;
    test();
  }
  
  function testLocal() {
    // Add property called __proto__ to the extension object.
    eval("var __proto__ = o");
    // Check that the extension object's prototype did not change.
    eval("var x = 27");
    assertFalse(setterCalled, "prototype of extension object changed");
    assertEquals(o, eval("__proto__"));
  }
  
  function testConstLocal() {
    // Add const property called __proto__ to the extension object.
    eval("const __proto__ = o");
    // Check that the extension object's prototype did not change.
    eval("var x = 27");
    assertFalse(setterCalled, "prototype of extension object changed");
    assertEquals(o, eval("__proto__"));
  }
  
  function testGlobal() {
    // Assign to the global __proto__ property.
    eval("__proto__ = o");
    // Check that the prototype of the global object changed.
    eval("x = 27");
    assertTrue(setterCalled, "prototype of global object did not change");
    setterCalled = false;
    assertEquals(o, eval("__proto__"));
  }
  
  runTest(testLocal);
  runTest(testConstLocal);
  runTest(testGlobal);
  
  