Language/Reference/Operator_Precedence/precedence_16_unary_postfix_t02.dart

// Copyright (c) 2016, 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
/// Description    Operator                          Associativity Precedence
/// Unary postfix  ., ?., e++, e–-, e1[e2], e1(), ()  None           16
/// @description Test that '?.' unary postfix operator has highest
/// precedence (16). Compare with Unary prefix (precedence 15). Test that
/// '?.' has priority higher than ~
/// @compile-error
/// @author sgrekhov@unipro.ru
/// @issue 42379


class C {
  C operator ~() {
    return this;
  }

  C e() {
    return this;
  }
}

main() {
  C c = new C();
  ~c?.e();      // With NNBD we are unable to run ~c?.e(); because c?.e() returns C?
}