11 pub enum Either<A, B> {  enum
18 impl<A, B> Either<A, B> {  implementation
29 impl<A, B, T> Either<(T, A), (T, B)> {  impl
41 impl<A, B, T> Either<(A, T), (B, T)> {  impl
53 impl<T> Either<T, T> {  impl
63 impl<A, B> Future for Either<A, B>  implementation
78 impl<A, B> FusedFuture for Either<A, B>  implementation
91 impl<A, B> Stream for Either<A, B>  implementation
113 impl<A, B> FusedStream for Either<A, B>  implementation
127 impl<A, B, Item> Sink<Item> for Either<A, B>  implementation
176     impl<A, B> AsyncRead for Either<A, B>  implementation
212     impl<A, B> AsyncWrite for Either<A, B>  implementation
254     impl<A, B> AsyncSeek for Either<A, B>  implementation
271     impl<A, B> AsyncBufRead for Either<A, B>  implementation