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

}