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b955271e51
Change-Id: I8d41ad649c83cd97253006693a0cf3676de418e9 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/145542 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Erik Ernst <eernst@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
26 lines
832 B
Dart
26 lines
832 B
Dart
// Copyright (c) 2020, 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 "package:expect/expect.dart";
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// Test that it is possible to invoke an object whose type is a proper subtype
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// of a function type (that is, its type is 'function-type bounded', and we
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// get to call it as if its type had been that bound).
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class A<X, Y extends X Function(X)> {
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final Y f;
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A(this.f);
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X m(X value) => f(value);
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}
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class B extends A<String, String Function(String, {int i})> {
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B(String Function(String, {int i}) f) : super(f);
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String m(String value) => f(value, i: 42);
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}
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void main() {
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B b = B((String s, {int i = -1}) => "$s and $i");
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Expect.equals('24 and 42', b.m('24'));
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}
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