Big merge from experimental to bleeding edge.

tests/corelib/iterable_skip_test.dart

+// Copyright (c) 2012, 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.
+
+main() {
+  List<int> list1 = <int>[1, 2, 3];
+  List<int> list2 = const <int>[4, 5];
+  List<String> list3 = <String>[];
+  Set<int> set1 = new Set<int>();
+  set1..add(11)
+      ..add(12)
+      ..add(13);
+  Set set2 = new Set();
+
+  Iterable<int> skip0 = list1.skip(0);
+  Iterator<int> it = skip0.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(1, it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(2, it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(3, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  Iterable<int> skip1 = list1.skip(1);
+  it = skip1.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(2, it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(3, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  Iterable<int> skip2 = list1.skip(2);
+  it = skip2.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(3, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  Iterable<int> skip3 = list1.skip(3);
+  it = skip3.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  Iterable<int> skip4 = list1.skip(4);
+  it = skip4.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip0 = list1.skip(0);
+  skip1 = skip0.skip(1);
+  skip2 = skip1.skip(1);
+  skip3 = skip2.skip(1);
+  skip4 = skip3.skip(1);
+  it = skip0.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(1, it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(2, it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(3, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+  it = skip1.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(2, it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(3, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+  it = skip2.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(3, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+  it = skip3.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+  it = skip4.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip0 = list2.skip(0);
+  it = skip0.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(4, it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(5, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip1 = list2.skip(1);
+  it = skip1.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.equals(5, it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip2 = list2.skip(2);
+  it = skip2.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip3 = list2.skip(3);
+  it = skip3.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  Iterable<String> skip02 = list3.skip(0);
+  Iterator<String> it2 = skip02.iterator;
+  Expect.isNull(it2.current);
+  Expect.isFalse(it2.moveNext());
+  Expect.isNull(it2.current);
+
+  Iterable<String> skip12 = list3.skip(1);
+  it2 = skip12.iterator;
+  Expect.isNull(it2.current);
+  Expect.isFalse(it2.moveNext());
+  Expect.isNull(it2.current);
+
+  skip0 = set1.skip(0);
+  List<int> copied = skip0.toList();
+  Expect.equals(3, copied.length);
+  Expect.isTrue(set1.contains(copied[0]));
+  Expect.isTrue(set1.contains(copied[1]));
+  Expect.isTrue(set1.contains(copied[2]));
+  Expect.isTrue(copied[0] != copied[1]);
+  Expect.isTrue(copied[0] != copied[2]);
+  Expect.isTrue(copied[1] != copied[2]);
+  it = skip0.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.isNotNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.isNotNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.isNotNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip1 = set1.skip(1);
+  copied = skip1.toList();
+  Expect.equals(2, copied.length);
+  Expect.isTrue(set1.contains(copied[0]));
+  Expect.isTrue(set1.contains(copied[1]));
+  Expect.isTrue(copied[0] != copied[1]);
+  it = skip1.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.isNotNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.isNotNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip2 = set1.skip(2);
+  copied = skip2.toList();
+  Expect.equals(1, copied.length);
+  Expect.isTrue(set1.contains(copied[0]));
+  it = skip2.iterator;
+  Expect.isNull(it.current);
+  Expect.isTrue(it.moveNext());
+  Expect.isNotNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip3 = set1.skip(3);
+  it = skip3.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip4 = set1.skip(4);
+  it = skip4.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip0 = set2.skip(0);
+  it = skip0.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+
+  skip1 = set2.skip(1);
+  it = skip1.iterator;
+  Expect.isNull(it.current);
+  Expect.isFalse(it.moveNext());
+  Expect.isNull(it.current);
+}