v8/test/mjsunit/compiler/regress-946889.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

Object.preventExtensions(Array.prototype);

function foo() {
  var arr = [];
  [...arr, 42, null];
  arr.length = 1;
};
%PrepareFunctionForOptimization(foo);
foo();
foo();
%OptimizeFunctionOnNextCall(foo);
foo();