test/mjsunit/regress/regress-760-1.js

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// Check that when valueOf for a String object is overwritten it is called and
// the result used when that object is added with a string.  

// See: http://code.google.com/p/v8/issues/detail?id=760

String.prototype.valueOf = function() { return 'y' };

function test() {
  var o = Object('x');
  assertEquals('y', o + '');
  assertEquals('y', '' + o);
}

for (var i = 0; i < 10; i++) {
  var o = Object('x');
  assertEquals('y', o + '');
  assertEquals('y', '' + o);
}

for (var i = 0; i < 10; i++) {
  test()
}