Asynchronous I/O
This crate contains the `AsyncRead`, `AsyncWrite`, `AsyncSeek`, and
`AsyncBufRead` traits, the asynchronous analogs to
`std::io::{Read, Write, Seek, BufRead}`. The primary difference is
that these traits integrate with the asynchronous task system.
All items of this library are only available when the `std` feature of this
library is activated, and it is activated by default.