Update charted to 0.4.8 and roll

packages/quiver_iterables/lib/src/generating_iterable.dart

Index: packages/quiver_iterables/lib/src/generating_iterable.dart
diff --git a/packages/quiver_iterables/lib/src/generating_iterable.dart b/packages/quiver_iterables/lib/src/generating_iterable.dart
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-// Copyright 2014 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-part of quiver.iterables;
-
-Iterable generate(initial(), next(o)) => new GeneratingIterable(initial, next);
-
-/// An Iterable who's first value is [object] and who's subsequent values are
-/// generated by passing the current value to the [next] function.
-///
-/// The class is useful for creating lazy iterables from object hierarchies and
-/// graphs.
-///
-/// It's important that for the given initial value and next function that the
-/// sequence of items eventually terminates. Otherwise calling methods that
-/// expect a finite sequence, like `length` or `last`, will cause an infinite
-/// loop.
-///
-/// Example:
-///
-///     class Node {
-///       Node parent;
-///
-///       /// An iterable of node and all ancestors up to the root.
-///       Iterable<Node> ancestors =
-///           new GeneratingIterable<Node>(() => this, (n) => n.parent);
-///
-///       /// An iterable of the root and the path of nodes to this. The
-///       /// reverse of ancestors.
-///       Iterable<Node> path = ancestors.toList().reversed();
-///     }
-///
-class GeneratingIterable<T> extends IterableBase<T> {
-  final initial;
-  final next;
-
-  GeneratingIterable(T this.initial(), T this.next(T o));
-
-  @override
-  Iterator<T> get iterator => new _GeneratingIterator(initial(), next);
-}
-
-class _GeneratingIterator<T> implements Iterator<T> {
-  final next;
-  T object;
-  bool started = false;
-
-  _GeneratingIterator(T this.object, T this.next(T o));
-
-  @override
-  T get current => started ? object : null;
-
-  @override
-  bool moveNext() {
-    if (object == null) return false;
-    if (started) {
-      object = next(object);
-    } else {
-      started = true;
-    }
-    return object != null;
-  }
-}