28 pub enum Either<A, B> {  enum
35 impl<A, B> Either<A, B> {  implementation
66 impl<A, B, T> Either<(T, A), (T, B)> {  impl
78 impl<A, B, T> Either<(A, T), (B, T)> {  impl
90 impl<T> Either<T, T> {  impl
100 impl<A, B> Future for Either<A, B>  implementation
115 impl<A, B> FusedFuture for Either<A, B>  implementation
128 impl<A, B> Stream for Either<A, B>  implementation
150 impl<A, B> FusedStream for Either<A, B>  implementation
164 impl<A, B, Item> Sink<Item> for Either<A, B>  implementation
211     impl<A, B> AsyncRead for Either<A, B>  implementation
239     impl<A, B> AsyncWrite for Either<A, B>  implementation
281     impl<A, B> AsyncSeek for Either<A, B>  implementation
298     impl<A, B> AsyncBufRead for Either<A, B>  implementation