blob: 46795c8104ac0596069fe62c141f595b0e428218 [file] [log] [blame]
// 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 application is an expression of the form E(expr) or
/// E<typeArgs>(expr) where E denotes an extension declaration (that is, E a
/// simple or qualified identifier which refers to the extension declaration).
/// An extension application is subject to static type inference. If E is an
/// extension declared as extension E<X...> on T {...}, then the type inference
/// for an extension application is done exactly the same as it would be for the
/// same syntax considered as a constructor invocation on a class declared as:
/// class E<X...> {
/// final T $target;
/// E(this.$target);
/// }
/// with no context type for the constructor invocation.
/// @description Check that an extension application is subject to static type
/// inference
/// @author
import "../../Utils/expect.dart";
class A {}
class C extends A {}
class X<T extends A> {
String name = "My name is X";
extension ExtendedX<T extends A> on X<T> {
String checkme() =>;
main() {
X<C> x1 = X<C>();
Expect.equals("My name is X", ExtendedX(x1).checkme());
X<A> x2 = X<A>();
Expect.equals("My name is X", ExtendedX(x2).checkme());