Language/Statements/For/For_in/execution_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 A for statement of the form for (finalConstVarOrType? id in e) s
 * is equivalent to the following code:
 *   var n0 = e.iterator;
 *   while (n0.moveNext()) {
 *     finalConstVarOrType? id = n0.current;
 *     s
 *   }
 * where n0 is an identifier that does not occur anywhere in the program, except
 * that for purposes of static typechecking, it is checked under the assumption
 * that n0 is declared to be of type T, where T is the static type of e.iterator.
 * @description Checks that a [TypeError] is thrown if the type of e
 * does not implement [Iterable].
 * @author vasya
 */
import '../../../../Utils/expect.dart';

class A {}

void check(var e) {
  Expect.throws(() { for (var id in e); }, (e) => e is TypeError);

  Expect.throws(() { for (dynamic id in e); }, (e) => e is TypeError);

  Expect.throws(() {
     var id;
      for (id in e);
    }, (e) => e is TypeError);
}

main() {
  check(1234567);
  check("string");
  check(true);
  check(new A());
}