/*
 * Copyright (c) 2011, 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 A type T is more specific than a type S, written T << S, if T is S.
 * << is a partial order on types. T is a subtype of S, written T <: S, iff [⊥/Dynamic]T << S.
 * A type T may be assigned to a type S, written T <=> S, if either T <: S or S <: T.
 * @description Checks that a generic type T with several type parameters is a subtype of itself and
 * T is assignable to itself.
 * @author iefremov
 * @reviewer rodionov
 */
import "../../Utils/expect.dart";

class A<T, S, U> {
}

main() {
  //trivial check
  A a = new A();
  Expect.isTrue(a is A);
  A b = a;
  a = new A();
  Expect.isFalse(identical(a, b));

  //check with type parameters
  A<int, double, A> n = new A<int, double, A>();
  Expect.isTrue(a is A<int, double, A>);
  Expect.isTrue(n is A);

  a = n;
  n = new A();

  //type parameters are also generic
  a = new A();
  A<A<A, int, double>, List<String>, A> n2 = new A<A<A, int, double>, List<String>, A>();
  Expect.isTrue(a is A<A<A, int, double>, List<String>, A>);
  Expect.isTrue(n2 is A);

  a = n2;
  n2 = new A();

  Map m = new Map();
  Expect.isTrue(m is Map);
  Map m2 = m;
  m = new Map();

  Map<int, Object> mio = new Map<int, Object>();
  Expect.isTrue(mio is Map<int, Object>);
  Map<int, Object> mio2 = mio;
  mio = new Map<int, Object>();
}