blob: 814fd888ef82bde560b5e60a5d5241f77f4ade03 [file] [log] [blame]
// Copyright (c) 2021, 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 We will introduce syntax allowing you to explicitly instantiate a
/// function tear-off and a type literal for a generic class. The former for
/// consistency with constructor tear-offs, the latter to introduce in-line
/// types without needing a typedef, like we did for function types. And we do
/// both now because they share the same grammar productions.
/// Example:
/// T id<T>(T value) => value;
/// var idInt = id<int>; // Explicitly instantiated tear-off, saves on writing function types.
/// and
/// Type intList = List<int>; // In-line instantiated type literal.
/// @description Checks example from the Spec.
/// @author
// SharedOptions=--enable-experiment=constructor-tearoffs
import "../../Utils/expect.dart";
T id<T>(T value) => value;
var idInt = id<int>;
main() {
dynamic v = 42;
var i = idInt(v);
Expect.isTrue(i is int);
Expect.isFalse(i is String); // to check that i is not dynamic