Language/Classes/Instance_Methods/Operators/arity_0_or_1_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  It is a compile-time error if the arity of the user-declared
/// operator - is not 0 or 1.
/// The - operator is unique in that two overloaded versions are permitted.
/// If the operator has no arguments, it denotes unary minus.
/// If it as an argument, it denotes binary subtraction.
/// @description Checks that a compile-time error is produced if a user-defined
/// operator - specifies two parameters.
/// @compile-error
/// @author kaigorodov


class C {
  operator -(var val, var val2) {}
}

main() {
  new C() - new C();
}