28 pub enum Either<A, B> {  enum
35 impl<A, B> Either<A, B> {  impl
46 impl<A, B, T> Either<(T, A), (T, B)> {  impl
58 impl<A, B, T> Either<(A, T), (B, T)> {  impl
70 impl<T> Either<T, T> {  implementation
80 impl<A, B> Future for Either<A, B>  implementation
95 impl<A, B> FusedFuture for Either<A, B>  implementation
108 impl<A, B> Stream for Either<A, B>  implementation
130 impl<A, B> FusedStream for Either<A, B>  implementation
144 impl<A, B, Item> Sink<Item> for Either<A, B>  implementation
193     impl<A, B> AsyncRead for Either<A, B>  implementation
229     impl<A, B> AsyncWrite for Either<A, B>  implementation
271     impl<A, B> AsyncSeek for Either<A, B>  implementation
288     impl<A, B> AsyncBufRead for Either<A, B>  implementation