futures-enum 0.1.18

#[derive(Future, Stream, Sink, AsyncRead, AsyncWrite, AsyncSeek, AsyncBufRead)] for enums.
Documentation 
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use futures_enum::*;
enum Enum<A, B> {
    A(A),
    B(B),
}
#[allow(unsafe_code)]
impl<A, B> ::futures::stream::Stream for Enum<A, B>
where
    A: ::futures::stream::Stream,
    B: ::futures::stream::Stream<Item = <A as ::futures::stream::Stream>::Item>,
{
    type Item = <A as ::futures::stream::Stream>::Item;
    #[inline]
    fn poll_next(
        self: ::core::pin::Pin<&mut Self>,
        cx: &mut ::core::task::Context<'_>,
    ) -> ::core::task::Poll<::core::option::Option<Self::Item>> {
        unsafe {
            match self.get_unchecked_mut() {
                Enum::A(x) => {
                    ::futures::stream::Stream::poll_next(
                        ::core::pin::Pin::new_unchecked(x),
                        cx,
                    )
                }
                Enum::B(x) => {
                    ::futures::stream::Stream::poll_next(
                        ::core::pin::Pin::new_unchecked(x),
                        cx,
                    )
                }
            }
        }
    }
    #[inline]
    fn size_hint(&self) -> (usize, ::core::option::Option<usize>) {
        match self {
            Enum::A(x) => ::futures::stream::Stream::size_hint(x),
            Enum::B(x) => ::futures::stream::Stream::size_hint(x),
        }
    }
}
fn main() {}