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diff --git a/third_party/rust/tokio-0.1.22/src/io.rs b/third_party/rust/tokio-0.1.22/src/io.rs
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+//! Asynchronous I/O.
+//!
+//! This module is the asynchronous version of `std::io`. Primarily, it
+//! defines two traits, [`AsyncRead`] and [`AsyncWrite`], which extend the
+//! `Read` and `Write` traits of the standard library.
+//!
+//! # AsyncRead and AsyncWrite
+//!
+//! [`AsyncRead`] and [`AsyncWrite`] must only be implemented for
+//! non-blocking I/O types that integrate with the futures type system. In
+//! other words, these types must never block the thread, and instead the
+//! current task is notified when the I/O resource is ready.
+//!
+//! # Standard input and output
+//!
+//! Tokio provides asynchronous APIs to standard [input], [output], and [error].
+//! These APIs are very similar to the ones provided by `std`, but they also
+//! implement [`AsyncRead`] and [`AsyncWrite`].
+//!
+//! Unlike *most* other Tokio APIs, the standard input / output APIs
+//! **must** be used from the context of the Tokio runtime as they require
+//! Tokio specific features to function.
+//!
+//! [input]: fn.stdin.html
+//! [output]: fn.stdout.html
+//! [error]: fn.stderr.html
+//!
+//! # Utility functions
+//!
+//! Utilities functions are provided for working with [`AsyncRead`] /
+//! [`AsyncWrite`] types. For example, [`copy`] asynchronously copies all
+//! data from a source to a destination.
+//!
+//! # `std` re-exports
+//!
+//! Additionally, [`Read`], [`Write`], [`Error`], [`ErrorKind`], and
+//! [`Result`] are re-exported from `std::io` for ease of use.
+//!
+//! [`AsyncRead`]: trait.AsyncRead.html
+//! [`AsyncWrite`]: trait.AsyncWrite.html
+//! [`copy`]: fn.copy.html
+//! [`Read`]: trait.Read.html
+//! [`Write`]: trait.Write.html
+//! [`Error`]: struct.Error.html
+//! [`ErrorKind`]: enum.ErrorKind.html
+//! [`Result`]: type.Result.html
+
+pub use tokio_io::{AsyncRead, AsyncWrite};
+
+// standard input, output, and error
+#[cfg(feature = "fs")]
+pub use tokio_fs::{stderr, stdin, stdout, Stderr, Stdin, Stdout};
+
+// Utils
+pub use tokio_io::io::{
+    copy, flush, lines, read, read_exact, read_to_end, read_until, shutdown, write_all, Copy,
+    Flush, Lines, ReadExact, ReadHalf, ReadToEnd, ReadUntil, Shutdown, WriteAll, WriteHalf,
+};
+
+// Re-export io::Error so that users don't have to deal
+// with conflicts when `use`ing `futures::io` and `std::io`.
+pub use std::io::{Error, ErrorKind, Read, Result, Write};