src/v8/test/mjsunit/compiler/deopt-array-prototype-find.js

// Copyright 2018 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 --opt

/* Test deopt behaviors when the prototype has elements */

// find

(function () {
  var array = [,];

  function find() {
    return array.find(v => v > 0);
  }

  %PrepareFunctionForOptimization(find);
  find(); find();

  %OptimizeFunctionOnNextCall(find);
  assertEquals(find(), undefined);

  array.__proto__.push(6);
  // deopt
  assertEquals(find(), 6);
})();