tests/language/this/conditional_operator_test.dart

// Copyright (c) 2015, 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.

// Verify that the ?. operator cannot be used for forwarding "this"
// constructors.

class B {
  B();
  B.namedConstructor();
  var field = 1;
  method() => 1;

  B.forward()
    : this?.namedConstructor()
    //^^^^
    // [analyzer] COMPILE_TIME_ERROR.INVALID_REFERENCE_TO_THIS
    // [cfe] Expected an assignment after the field name.
    //^^^^
    // [analyzer] SYNTACTIC_ERROR.MISSING_ASSIGNMENT_IN_INITIALIZER
    //^^^^^^^^^^^^^^^^^^^^^^^^
    // [analyzer] COMPILE_TIME_ERROR.INITIALIZER_FOR_NON_EXISTENT_FIELD
    // [error line 15, column 11, length 0]
    // [cfe] Expected '.' before this.
    //    ^^
    // [analyzer] SYNTACTIC_ERROR.EXPECTED_TOKEN
    // [cfe] Expected an identifier, but got ''.
  ;

  test() {
    this?.field = 1;
//  ^
// [cfe] The receiver 'this' cannot be null.
//      ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
    this?.field += 1;
//  ^
// [cfe] The receiver 'this' cannot be null.
//      ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
    this?.field;
//  ^
// [cfe] The receiver 'this' cannot be null.
//      ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
    this?.method();
//  ^
// [cfe] The receiver 'this' cannot be null.
//      ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
  }
}

main() {
  new B.forward().test();
}