Language/Expressions/Identifier_Reference/evaluation_variable_or_parameter_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 Evaluation of an identifier expression e of the form id proceeds
/// as follows:
/// Let d be the innermost declaration in the enclosing lexical scope whose name
/// is id or id=. If no such declaration exists in the lexical scope, let d be
/// the declaration of the inherited member named id if it exists.
/// ...
/// • If d is a local variable or formal parameter then e evaluates to the
///   current binding of id.
/// @description Checks that a reference to a local variable is evaluated
/// correctly in closures.
/// @author msyabro
/// @issue 42368

import '../../../Utils/expect.dart';


main() {
  var x = 0;
  var f = () => x;
  x++;
  Expect.equals(1, x);
  Expect.equals(1, f());

  {
    var x = 4;
    var ff = () => x;
    x++;
    Expect.equals(5, x);
    Expect.equals(1, f());
    Expect.equals(5, ff());
  }
}