v8/test/mjsunit/regress/regress-crbug-142218.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//
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// Flags: --allow-natives-syntax

length = 1 << 16;
a = new Array(length);

function insert_element(key) {
  a[key] = 42;
};
%PrepareFunctionForOptimization(insert_element);
insert_element(1);
%OptimizeFunctionOnNextCall(insert_element);
insert_element(new Object());
count = 0;
for (var i = 0; i < length; i++) {
  if (a[i] != undefined) count++;
}
assertEquals(1, count);