Language/Generics/parameter_A04_t05.dart

/*
 * Copyright (c) 2019, 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.
 */
/**
 * @assertion
 *    typeParameter ::= metadata identifier (extends typeNotVoid)?
 *    typeParameters ::= ‘<’ typeParameter (‘,’ typeParameter)* ‘>’
 * ...
 * Type parameters are declared in the type parameter scope of a class or
 * function. The type parameters of a generic [G] are in scope in the bounds of
 * all of the type parameters of [G].
 * @description Checks that function type parameter is in the type parameter
 * scope.
 * @author iarkh@unipro.ru
 */

import "../../Utils/expect.dart";

class A {}
class B extends A {}

check<X extends A, Y extends X>(exp1, exp2) {
  Expect.equals(exp1, X);
  Expect.equals(exp2, Y);
}

main() {
  check(A, A);
  check<A, A>(A, A);
  check<A, B>(A, B);
  check<B, B>(B, B);
}