LanguageFeatures/Constant-update-2018/ShortCircuitOperators_A01_t03.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 The [&&] operator is now short-circuit in constant and potentially
 * constant expressions. It only attempts to evaluate the second operand if the
 * first operand evaluates to [true]. This makes [false && (null as
 * String).length] a valid constant expression. The second operand expression
 * still needs to be a potentially constant expression, which is a new use of
 * potentially constant expressions outside of [const] constructor initializer
 * lists.
 * @description Checks that [&&] throws error if the first operand of [&&]
 * operation is [true] and the second one is not valid in the constant
 * expression.
 * @author iarkh@unipro.ru
 */

const dynamic d = 0;

class MyClass1 {
  final bool b;
  const MyClass1() : b = true && (null as String).length < 25;
}

class MyClass2 {
  final bool b;
  const MyClass2() : b = true && d;
}

main() {
  const inst1 = MyClass1();
//              ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

  const inst2 = MyClass2();
//              ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

}