LanguageFeatures/nnbd/static_errors_A14_t05.dart

/*
 * 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 For the purposes of errors and warnings, the null aware operators
 * ?., ?.., and ?[] are checked as if the receiver of the operator had
 * non-nullable type. More specifically, if the type of the receiver of a null
 * aware operator is T, then the operator is checked as if the receiver had type
 * NonNull(T).
 *
 * @description Check that if the type of the receiver of a null aware operator
 * is T, then the operator is checked as if the receiver had type NonNull(T).
 * Test some type A
 * @issue 38715
 * @issue 39598
 * @static-warning
 * @author sgrekhov@unipro.ru
 */
// Requirements=nnbd-strong
class A {
  void test() {}
  int operator[](int index) => 0;
}

main() {
  A a = new A();
  a?.test();      /// static type warning
  a ?.. test();   /// static type warning
  a?[0];         /// static type warning
}