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// Copyright (c) 2020, 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 The definitions of least and greatest closure are changed in null
/// safe libraries to substitute [Never] in positions where previously [Null
/// would have been substituted, and [Object?] in positions where previously
/// [Object] or [dynamic] would have been substituted.
/// @description Check that [Object?] type is substituted for typedef C<X> = A<X>.
/// @note Read more about the least and greatest closure test template:
/// @author
// Requirements=nnbd-strong
import "../../../../Utils/expect.dart";
class A<X> {}
typedef C<X> = A<X>;
void main() {
void f<X>(C<X> Function() g) => g();
Expect.throws(() { f(() => captureTypeArgument()); });
Expect.equals(typeOf<C<Object?>>(), capturedTypeArgument);