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diff --git a/third_party/rust/png/src/lib.rs b/third_party/rust/png/src/lib.rs
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+++ b/third_party/rust/png/src/lib.rs
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+//! # PNG encoder and decoder
+//! This crate contains a PNG encoder and decoder. It supports reading of single lines or whole frames.
+//! ## The decoder
+//! The most important types for decoding purposes are [`Decoder`](struct.Decoder.html) and
+//! [`Reader`](struct.Reader.html). They both wrap a `std::io::Read`.
+//! `Decoder` serves as a builder for `Reader`. Calling `Decoder::read_info` reads from the `Read` until the
+//! image data is reached.
+//! ### Using the decoder
+//!     use std::fs::File;
+//!
+//!     // The decoder is a build for reader and can be used to set various decoding options
+//!     // via `Transformations`. The default output transformation is `Transformations::EXPAND
+//!     // | Transformations::STRIP_ALPHA`.
+//!     let decoder = png::Decoder::new(File::open("tests/pngsuite/basi0g01.png").unwrap());
+//!     let (info, mut reader) = decoder.read_info().unwrap();
+//!     // Allocate the output buffer.
+//!     let mut buf = vec![0; info.buffer_size()];
+//!     // Read the next frame. Currently this function should only called once.
+//!     // The default options
+//!     reader.next_frame(&mut buf).unwrap();
+//! ## Encoder
+//! ### Using the encoder
+//! ```no_run
+//! # #[cfg(feature = "png-encoding")] {
+//! // For reading and opening files
+//! use std::path::Path;
+//! use std::fs::File;
+//! use std::io::BufWriter;
+//!
+//! let path = Path::new(r"/path/to/image.png");
+//! let file = File::create(path).unwrap();
+//! let ref mut w = BufWriter::new(file);
+//!
+//! let mut encoder = png::Encoder::new(w, 2, 1); // Width is 2 pixels and height is 1.
+//! encoder.set_color(png::ColorType::RGBA);
+//! encoder.set_depth(png::BitDepth::Eight);
+//! let mut writer = encoder.write_header().unwrap();
+//!
+//! let data = [255, 0, 0, 255, 0, 0, 0, 255]; // An array containing a RGBA sequence. First pixel is red and second pixel is black.
+//! writer.write_image_data(&data).unwrap(); // Save
+//! # }
+//! ```
+//!
+//#![cfg_attr(test, feature(test))]
+
+#[macro_use] extern crate bitflags;
+
+pub mod chunk;
+mod decoder;
+#[cfg(feature = "png-encoding")]
+mod encoder;
+mod filter;
+mod traits;
+mod common;
+mod utils;
+
+pub use crate::common::*;
+pub use crate::decoder::{Decoder, Reader, OutputInfo, StreamingDecoder, Decoded, DecodingError, Limits};
+#[cfg(feature = "png-encoding")]
+pub use crate::encoder::{Encoder, Writer, StreamWriter, EncodingError};
+pub use crate::filter::FilterType;