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// Copyright (c) 2015, 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.
// Regression test for issue 21912.
class A {}
class B extends A {}
typedef T Function2<S, T>(S z);
typedef B AToB(A x);
typedef A BToA(B x);
void main() {
Function2<Function2<A, B>, Function2<B, A>> t1;
Function2<AToB, BToA> t2;
Function2<Function2<int, double>, Function2<int, double>> left;
left = t1; //# 01: compile-time error
left = t2; //# 02: compile-time error