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diff --git a/vendor/xz2/src/lib.rs b/vendor/xz2/src/lib.rs
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+//! LZMA/XZ encoding and decoding streams
+//!
+//! This library is a binding to liblzma currently to provide LZMA and xz
+//! encoding/decoding streams. I/O streams are provided in the `read`, `write`,
+//! and `bufread` modules (same types, different bounds). Raw in-memory
+//! compression/decompression is provided via the `stream` module and contains
+//! many of the raw APIs in liblzma.
+//!
+//! # Examples
+//!
+//! ```
+//! use std::io::prelude::*;
+//! use xz2::read::{XzEncoder, XzDecoder};
+//!
+//! // Round trip some bytes from a byte source, into a compressor, into a
+//! // decompressor, and finally into a vector.
+//! let data = "Hello, World!".as_bytes();
+//! let compressor = XzEncoder::new(data, 9);
+//! let mut decompressor = XzDecoder::new(compressor);
+//!
+//! let mut contents = String::new();
+//! decompressor.read_to_string(&mut contents).unwrap();
+//! assert_eq!(contents, "Hello, World!");
+//! ```
+//!
+//! # Async I/O
+//!
+//! This crate optionally can support async I/O streams with the Tokio stack via
+//! the `tokio` feature of this crate:
+//!
+//! ```toml
+//! xz2 = { version = "0.3", features = ["tokio"] }
+//! ```
+//!
+//! All methods are internally capable of working with streams that may return
+//! `ErrorKind::WouldBlock` when they're not ready to perform the particular
+//! operation.
+//!
+//! Note that care needs to be taken when using these objects, however. The
+//! Tokio runtime, in particular, requires that data is fully flushed before
+//! dropping streams. For compatibility with blocking streams all streams are
+//! flushed/written when they are dropped, and this is not always a suitable
+//! time to perform I/O. If I/O streams are flushed before drop, however, then
+//! these operations will be a noop.
+
+#![deny(missing_docs)]
+#![doc(html_root_url = "https://docs.rs/xz2/0.1")]
+
+extern crate lzma_sys;
+
+#[cfg(test)]
+extern crate rand;
+#[cfg(test)]
+extern crate quickcheck;
+#[cfg(feature = "tokio")]
+#[macro_use]
+extern crate tokio_io;
+#[cfg(feature = "tokio")]
+extern crate futures;
+
+pub mod stream;
+
+pub mod bufread;
+pub mod read;
+pub mod write;