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diff --git a/third_party/rust/yaml-rust/src/lib.rs b/third_party/rust/yaml-rust/src/lib.rs
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+// Copyright 2015, Yuheng Chen. See the LICENSE file at the top-level
+// directory of this distribution.
+
+//! YAML 1.2 implementation in pure Rust.
+//!
+//! # Usage
+//!
+//! This crate is [on github](https://github.com/chyh1990/yaml-rust) and can be
+//! used by adding `yaml-rust` to the dependencies in your project's `Cargo.toml`.
+//!
+//! ```toml
+//! [dependencies.yaml-rust]
+//! git = "https://github.com/chyh1990/yaml-rust.git"
+//! ```
+//!
+//! And this in your crate root:
+//!
+//! ```rust
+//! extern crate yaml_rust;
+//! ```
+//!
+//! Parse a string into `Vec<Yaml>` and then serialize it as a YAML string.
+//!
+//! # Examples
+//!
+//! ```
+//! use yaml_rust::{YamlLoader, YamlEmitter};
+//!
+//! let docs = YamlLoader::load_from_str("[1, 2, 3]").unwrap();
+//! let doc = &docs[0]; // select the first document
+//! assert_eq!(doc[0].as_i64().unwrap(), 1); // access elements by index
+//!
+//! let mut out_str = String::new();
+//! let mut emitter = YamlEmitter::new(&mut out_str);
+//! emitter.dump(doc).unwrap(); // dump the YAML object to a String
+//!
+//! ```
+
+#![doc(html_root_url = "https://docs.rs/yaml-rust/0.4.5")]
+#![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
+#![cfg_attr(feature = "cargo-clippy", warn(cyclomatic_complexity))]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    allow(match_same_arms, should_implement_trait)
+)]
+
+extern crate linked_hash_map;
+
+pub mod emitter;
+pub mod parser;
+pub mod scanner;
+pub mod yaml;
+
+// reexport key APIs
+pub use crate::emitter::{EmitError, YamlEmitter};
+pub use crate::parser::Event;
+pub use crate::scanner::ScanError;
+pub use crate::yaml::{Yaml, YamlLoader};
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_api() {
+        let s = "
+# from yaml-cpp example
+- name: Ogre
+  position: [0, 5, 0]
+  powers:
+    - name: Club
+      damage: 10
+    - name: Fist
+      damage: 8
+- name: Dragon
+  position: [1, 0, 10]
+  powers:
+    - name: Fire Breath
+      damage: 25
+    - name: Claws
+      damage: 15
+- name: Wizard
+  position: [5, -3, 0]
+  powers:
+    - name: Acid Rain
+      damage: 50
+    - name: Staff
+      damage: 3
+";
+        let docs = YamlLoader::load_from_str(s).unwrap();
+        let doc = &docs[0];
+
+        assert_eq!(doc[0]["name"].as_str().unwrap(), "Ogre");
+
+        let mut writer = String::new();
+        {
+            let mut emitter = YamlEmitter::new(&mut writer);
+            emitter.dump(doc).unwrap();
+        }
+
+        assert!(!writer.is_empty());
+    }
+
+    fn try_fail(s: &str) -> Result<Vec<Yaml>, ScanError> {
+        let t = YamlLoader::load_from_str(s)?;
+        Ok(t)
+    }
+
+    #[test]
+    fn test_fail() {
+        let s = "
+# syntax error
+scalar
+key: [1, 2]]
+key1:a2
+";
+        assert!(YamlLoader::load_from_str(s).is_err());
+        assert!(try_fail(s).is_err());
+    }
+
+}