Language/Expressions/Assignable_Expressions/getter_invocation_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 An assignable expression of the form e.id or e?.id is evaluated
/// as a property extraction.
/// @description Checks that expression of the form e?.id is evaluated as
/// ((x) => x == null ? null : x.id)(e).
/// @author ngl@unipro.ru


import '../../../Utils/expect.dart';

class A {
  var _x;
  var y;

  A(): _x = 1, y = 1;

  get x {
    y = 20;
    return _x;
  }
}

main() {
  A a = new A();
  A? b = null;
  Expect.equals(1, a?.x);
//                  ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
//                 ^
// [cfe] Operand of null-aware operation '?.' has type 'A' which excludes null.
  Expect.equals(20, a?.y);
//                   ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
//                  ^
// [cfe] Operand of null-aware operation '?.' has type 'A' which excludes null.
  Expect.isNull(b?.x);
  Expect.isNull(b?.y);
}