v8/test/mjsunit/array-shift3.js

// 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;
};
%PrepareFunctionForOptimization(test);
assertEquals(['element 1', {}], test([0, , {}]));
assertEquals(['element 1', 10], test([9, , 10]));
%OptimizeFunctionOnNextCall(test);
assertEquals(['element 1', 10], test([9, , 10]));