// 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.

// Implements Function which is not allowed in Dart 3.
// @dart=2.19

// Dart test program to test arithmetic operations.

import "package:expect/expect.dart";

class C1 {
  int call(int i) => 2 * i;
}

class C2 implements Function {
  int call(int i) => 2 * i;
}

C1 c1 = new C1();
dynamic d1 = new C1();
C2 c2 = new C2();
dynamic d2 = new C2();

main() {
  // Implicitly invokes c1.call(1)
  Expect.equals(c1(1), 2); //# 01: ok
  // Implicitly invokes d1.call(1)
  Expect.equals(d1(1), 2); //# 02: ok
  // Implicitly invokes c2.call(1)
  Expect.equals(c2(1), 2); //# 03: ok
  // Implicitly invokes d2.call(1)
  Expect.equals(d2(1), 2); //# 04: ok
}