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);
}