array-shift3.js 507 Bytes
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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax

Array.prototype[1] = "element 1";
function test(a) {
  a.shift();
  return a;
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};
%PrepareFunctionForOptimization(test);
assertEquals(['element 1', {}], test([0, , {}]));
assertEquals(['element 1', 10], test([9, , 10]));
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%OptimizeFunctionOnNextCall(test);
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assertEquals(['element 1', 10], test([9, , 10]));