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// Copyright (c) 2019, 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.
/// @assertion an extension declaration is a top-level declaration with a grammar
/// similar to:
/// <extension> ::=
/// `extension' <identifier>? <typeParameters>? `on' <type> `?'? `{'
/// memberDeclaration*
/// `}'
/// Such a declaration introduces its name (the identifier) into the surrounding
/// scope
/// @description Check correct syntax of top-level extension declaration
/// @author
import "../../Utils/expect.dart";
extension MyFancyList<T> on List<T> {
int get doubleLength => this.length * 2;
List<T> operator-() => this.reversed.toList();
List<List<T>> split(int at) => <List<T>>[this.sublist(0, at), this.sublist(at)];
static String get className => "List";
main() {
List<String> list = ["Lily", "was", "here"];
Expect.equals(6, list.doubleLength);
Expect.listEquals([["Lily"], ["was", "here"]], list.split(1));
Expect.listEquals(["here", "was", "Lily"], -list);
Expect.equals("List", MyFancyList.className);