LanguageFeatures/Control-flow-collections/type_promotion_A01_t01.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 As with the if statement, the condition expression of an if
 * element induces type promotion in the "then" element of the if when the
 * condition expression shows that a variable has some type and promotion isn't
 * otherwise aborted.
 *
 * @description Checks that the condition expression of an if element induces
 * type promotion in the "then" element of the if when the condition expression
 * shows that a variable has some type.
 * @author sgrekhov@unipro.ru
 */
// SharedOptions=--enable-experiment=constant-update-2018
import "../../Utils/expect.dart";

class A {
  int get a => 0;
}
class C extends A {
  int get c => 1;
}


main() {
  A a = new A();
  A c = new C();
  var v1 = [
    if (a is C) a.c,
    if (c is C) c.c
  ];
  Expect.listEquals([1], v1);
}