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// Copyright (c) 2020, 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.
// @dart = 2.9
import "package:expect/expect.dart";
// Test that it is possible to invoke an object whose type is a proper subtype
// of a function type (that is, its type is 'function-type bounded', and we
// get to call it as if its type had been that bound).
class A<X, Y extends X Function(X)> {
final Y f;
X m(X value) => f(value);
class B extends A<String, String Function(String, {int i})> {
B(String Function(String, {int i}) f) : super(f);
String m(String value) => f(value, i: 42);
void main() {
B b = B((String s, {int i}) => "$s and $i");
Expect.equals('24 and 42', b.m('24'));