// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file | |
// for details. All rights reserved. Use of this source code is governed by a | |
// BSD-style license that can be found in the LICENSE file. | |
class WeakMap<K extends Object, V> { | |
WeakMap(List<(K, V)> entries) { | |
var mapped = entries.map((i) => [i.$1, i.$2]); | |
var first = mapped.first; | |
first.add(null); | |
Object o = first.first; // Error. | |
} | |
} | |