test/mjsunit/compiler/regress-958716.js

// Copyright 2019 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

for (let i = 0; i < 2; i++) {
  new String().valueOf = Symbol;
}

function foo() {
  Promise.resolve("");
};
%PrepareFunctionForOptimization(foo);
foo();
%OptimizeFunctionOnNextCall(foo);
foo();