LanguageFeatures/Abstract-external-fields/static_analysis_external_A04_t02.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 An external variable declaration D is treated as an external
/// getter declaration and possibly an external setter declaration. The setter is
/// included if and only if D is non-final. The return type of the getter and the
/// parameter type of the setter, if present, is the type of D (which may be
/// declared explicitly, obtained by override inference, or defaulted to dynamic).
/// The parameter of the setter, if present, has the modifier covariant if and
/// only if D has the modifier covariant (the grammar only allows this modifier
/// on external instance variables).
///
/// @description Checks that declaration
///  class A {
///    external covariant int i1;
///    external covariant var i2;
/// desugared as
///  class A {
///    external int get i1;
///    external void set i1(covariant int _);
///    external int get i2;
///    external void set i2(covariant int _);
/// @author sgrekhov@unipro.ru

class A {
  external covariant num i1;
  external covariant var i2;
}

class C1 extends A {
  int i1 = 0;
  String i2 = "";

  test() {
    int j = i1;
    i1 = 42;
    String s = i2;
    i2 = "Lily was here";
  }
}

class C2 extends A {
  int get i1 => 0;
  void set i1(int v) {}
  String get i2 => "";
  void set i2(String v) {}

  test() {
    int j = i1;
    i1 = 42;
    String s = i2;
    i2 = "Lily was here";
  }
}

main() {
  new C1().test();
  new C2().test();
}