LanguageFeatures/nnbd/static_errors_A30_t03.dart

// 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 Given a switch statement which switches over an expression e of
/// type T, where the cases are dispatched based on expressions e0...ek:
///
/// - It is no longer required that the ei evaluate to instances of the same
///  class.
/// - It is an error if any of the ei evaluate to a value whose static type is
///  not a subtype of T.
/// - If T is an enum type, it is a warning if the switch does not handle all
///  enum cases, either explicitly or via a default.
/// - If T is Q? where Q is an enum type, it is a warning if the switch does not
///  handle all enum cases and null, either explicitly or via a default.
///
/// @description Check that it is not an error if any of the ei evaluate to
/// constants for which equality is not primitive.
/// @author sgrekhov@unipro.ru

class C {
  const C();
  bool operator ==(Object other) => true;
}

main() {
  const c1 = const C();
  C c = new C();
  switch (c) {
    case c1:
      true;
      break;
    default:
      false;
  }
}