Language/Classes/Constructors/Constant_Constructors/invalid_constant_initializer_t02.dart

// Copyright (c) 2011, 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  When invoked from a constant object expression, a constant
/// constructor must throw an exception if any of its actual parameters is a
/// value that would prevent one of the potentially constant expressions within
/// it from being a valid compile-time constant.
/// @description Checks that compile-time error is produced if actual parameters
/// passed to the constructor make the constant initializer invalid. Note: this
/// mechanism is described in Classes.Constructors.Constant_Constructors.
/// @author iefremov


class A {
  final x;
  const A(var p) : x = p + 42;
}

class IntPair {
  const IntPair(this.x, this.y);
  final int x;
  final int y;
  operator +(int v) => new IntPair(x + v, y + v);
}

main() {
  var a = const A(const IntPair(1, 2)); // parameter does not evaluate to int/bool/String, despite implementing the plus operator
//              ^
// [analyzer] unspecified
// [cfe] unspecified
}