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14531fa62d
Only delta from the original is a bad merge of tests/corelib/list_test.dart
This reverts commit 44d8be0ed3
.
BUG=
Review-Url: https://codereview.chromium.org/2774783002 .
51 lines
1.4 KiB
Dart
51 lines
1.4 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "dart:collection";
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abstract class Link<T> extends IterableBase<T> {
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// does not match constructor for LinkFactory
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factory Link(T head, [Link<T> tail]) = LinkFactory<T>; //# static type warning
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Link<T> prepend(T element);
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}
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abstract class EmptyLink<T> extends Link<T> {
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const factory EmptyLink() = LinkTail<T>;
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}
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class LinkFactory<T> {
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factory LinkFactory(head, [Link tail]) {}
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}
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// Does not implement all of Iterable
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class AbstractLink<T> implements Link<T> {
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const AbstractLink();
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Link<T> prepend(T element) {
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return new Link<T>(element, this);
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}
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}
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// Does not implement all of Iterable
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class LinkTail<T> extends AbstractLink<T> implements EmptyLink<T> {
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const LinkTail();
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}
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// Does not implement all of Iterable
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class LinkEntry<T> extends AbstractLink<T> {
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LinkEntry(T head, Link<T> realTail);
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}
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class Fisk {
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// instantiation of abstract class
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Link<String> nodes = const EmptyLink(); // //# static type warning
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}
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main() {
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new Fisk();
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// instantiation of abstract class
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new EmptyLink<String>().prepend('hest'); //# static type warning
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// instantiation of abstract class
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const EmptyLink<String>().prepend('fisk'); //# static type warning
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}
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