Robert Nystrom
739852d99d
Change-Id: I3356296e72dfa07b0ac994da0ce96f766b182e80 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/137722 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Leaf Petersen <leafp@google.com>
36 lines
963 B
Dart
36 lines
963 B
Dart
// Copyright (c) 2018, 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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// Dart test program to test arithmetic operations.
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import "package:expect/expect.dart";
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class B {}
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class C {
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B call(B b) => b;
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}
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class D implements Function {
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B call(B b) => b;
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}
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typedef B BToB(B x);
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typedef Object NullToObject(Null x);
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main() {
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// The presence of a `.call` method does not cause class `C` to become a
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// subtype of any function type.
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C c = new C();
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Expect.isFalse(c is BToB); //# 01: ok
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Expect.isFalse(c is NullToObject); //# 02: ok
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Expect.isFalse(c is Function); //# 03: ok
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// The same goes for class `D`: `implements Function` is ignored in Dart 2.
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D d = new D();
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Expect.isFalse(d is BToB); //# 04: ok
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Expect.isFalse(d is NullToObject); //# 05: ok
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Expect.isFalse(d is Function); //# 06: ok
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}
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