v8/test/mjsunit/regress/regress-186.js

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// 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 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(testGlobal);