Migrated test block 13 to Dart 2.0.

tests/corelib_strong/list_for_each_test.dart

-// Copyright (c) 2013, 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.
-
-import "package:expect/expect.dart";
-import "dart:collection";
-
-class MyList extends ListBase {
-  List list;
-  MyList(this.list);
-  get length => list.length;
-  set length(value) {
-    list.length = value;
-  }
-
-  operator [](index) => list[index];
-  operator []=(index, val) {
-    list[index] = val;
-  }
-
-  toString() => list.toString();
-}
-
-void testWithoutModification(List list) {
-  var seen = [];
-  list.forEach(seen.add);
-
-  Expect.listEquals(list, seen);
-}
-
-void testWithModification(List list) {
-  if (list.isEmpty) return;
-  Expect.throws(() => list.forEach((_) => list.add(0)),
-      (e) => e is ConcurrentModificationError);
-}
-
-main() {
-  List fixedLengthList = new List(10);
-  for (int i = 0; i < 10; i++) fixedLengthList[i] = i + 1;
-
-  List growableList = new List();
-  growableList.length = 10;
-  for (int i = 0; i < 10; i++) growableList[i] = i + 1;
-
-  var growableLists = [
-    [],
-    [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
-    new MyList([1, 2, 3, 4, 5]),
-    growableList,
-  ];
-  var fixedLengthLists = [
-    const [],
-    fixedLengthList,
-    const [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
-    new MyList(const [1, 2]),
-  ];
-
-  for (var list in growableLists) {
-    print(list);
-    testWithoutModification(list);
-    testWithModification(list);
-  }
-
-  for (var list in fixedLengthLists) {
-    testWithoutModification(list);
-  }
-}