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// 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 We say that a type T is nullable if Null <: T and not T <: Object.
/// This is equivalent to the syntactic criterion that T is any of:
/// Null
/// S? for some S
/// S* for some S where S is nullable
/// FutureOr<S> for some S where S is nullable
/// dynamic
/// void
/// @description Check that null can be assigned to nullable type. Test S? for
/// some S. Test type aliases
/// @author
// Requirements=nnbd-strong
class C {}
typedef CAlias = C?;
typedef IntAlias = int?;
typedef StringAlias = String?;
main() {
CAlias c = C();
c = null;
IntAlias i = null;
StringAlias s = "";
s = null;