test/mjsunit/regress/regress-crbug-762874-2.js

// Copyright 2017 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

const maxLength = %StringMaxLength();
const s = 'A'.repeat(maxLength);

function foo(s) {
  let x = s.lastIndexOf("", maxLength);
  return x === maxLength;
}

assertTrue(foo(s));
assertTrue(foo(s));
%OptimizeFunctionOnNextCall(foo);
assertTrue(foo(s));