Update charted to 0.4.8 and roll

packages/quiver/lib/src/iterables/infinite_iterable.dart

Index: packages/quiver/lib/src/iterables/infinite_iterable.dart
diff --git a/packages/quiver/lib/src/iterables/infinite_iterable.dart b/packages/quiver/lib/src/iterables/infinite_iterable.dart
index cfe0bd2cf21b65e7795f357b4689683dfed15cb8..2a7eb9c05f6a3ee467f4b7609558d622ed23692b 100644
--- a/packages/quiver/lib/src/iterables/infinite_iterable.dart
+++ b/packages/quiver/lib/src/iterables/infinite_iterable.dart
@@ -14,10 +14,9 @@
 
 part of quiver.iterables;
 
-/**
- * A base class for [Iterable]s of infinite length that throws
- * [UnsupportedError] for methods that would require the Iterable to terminate.
- */
+/// A base class for [Iterable]s of infinite length that throws
+/// [UnsupportedError] for methods that would require the Iterable to
+/// terminate.
 abstract class InfiniteIterable<T> extends IterableBase<T> {
   bool get isEmpty => false;
 
@@ -31,7 +30,7 @@ abstract class InfiniteIterable<T> extends IterableBase<T> {
 
   bool every(bool f(T element)) => throw new UnsupportedError('every');
 
-  bool fold(initialValue, combine(previousValue, T element)) =>
+  T1 fold<T1>(T1 initialValue, T1 combine(T1 previousValue, T element)) =>
       throw new UnsupportedError('fold');
 
   void forEach(void f(T element)) => throw new UnsupportedError('forEach');