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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() {
test(
Function2<Function2<A, B>, Function2<B, A>> t1,
Function2<AToB, BToA> t2,
Function2<Function2<int, double>, Function2<int, double>> left) {
left = t1;
// ^^
// [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
// [cfe] A value of type 'A Function(B) Function(B Function(A))' can't be assigned to a variable of type 'double Function(int) Function(double Function(int))'.
left = t2;
// ^^
// [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
// [cfe] A value of type 'A Function(B) Function(B Function(A))' can't be assigned to a variable of type 'double Function(int) Function(double Function(int))'.
}
}