test/mjsunit/regress/regress-1878.js

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// See: http://code.google.com/p/v8/issues/detail?id=1878

// Flags: --allow-natives-syntax --expose_natives_as=natives

var a = Array();

for (var i = 0; i < 1000; i++) {
  var ai = natives.InternalArray(10000);
  assertFalse(%HaveSameMap(ai, a));
  assertTrue(%HasFastElements(ai));
}

for (var i = 0; i < 1000; i++) {
  var ai = new natives.InternalArray(10000);
  assertFalse(%HaveSameMap(ai, a));
  assertTrue(%HasFastElements(ai));
}