blob: 0b8f5340da70e5b547125e0f92ccf517e17ef679 [file] [log] [blame]
// Copyright (c) 2018, 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 test program to test arithmetic operations.
import "package:expect/expect.dart";
class B {}
class C {
B call(B b) => b;
class D implements Function {
B call(B b) => b;
typedef B BToB(B x);
typedef Object NullToObject(Null x);
main() {
// The presence of a `.call` method does not cause class `C` to become a
// subtype of any function type.
C c = new C();
Expect.isFalse(c is BToB); //# 01: ok
Expect.isFalse(c is NullToObject); //# 02: ok
Expect.isFalse(c is Function); //# 03: ok
// The same goes for class `D`, except that it is a subtype of `Function`
// because it is explicitly declared to be so.
D d = new D();
Expect.isFalse(d is BToB); //# 04: ok
Expect.isFalse(d is NullToObject); //# 05: ok
Expect.isTrue(d is Function); //# 06: ok