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();
}