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diff --git a/third_party/rust/fluent-langneg/src/lib.rs b/third_party/rust/fluent-langneg/src/lib.rs
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+++ b/third_party/rust/fluent-langneg/src/lib.rs
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+//! fluent-langneg is an API for operating on locales and language tags.
+//! It's part of Project Fluent, a localization framework designed to unleash
+//! the expressive power of the natural language.
+//!
+//! The primary use of fluent-langneg is to parse/modify/serialize language tags
+//! and to perform language negotiation.
+//!
+//! fluent-langneg operates on a subset of [BCP47](http://tools.ietf.org/html/bcp47).
+//! It can parse full BCP47 language tags, and will serialize them back,
+//! but currently only allows for operations on primary subtags and
+//! unicode extension keys.
+//!
+//! In result fluent-langneg is not suited to replace full implementations of
+//! BCP47 like [rust-language-tags](https://github.com/pyfisch/rust-language-tags),
+//! but is arguably a better option for use cases involving operations on
+//! language tags and for language negotiation.
+
+pub mod accepted_languages;
+pub mod negotiate;
+
+pub use accepted_languages::parse as parse_accepted_languages;
+pub use negotiate::negotiate_languages;
+pub use negotiate::NegotiationStrategy;
+
+use unic_langid::{LanguageIdentifier, LanguageIdentifierError};
+
+pub fn convert_vec_str_to_langids<'a, I, J>(
+    input: I,
+) -> Result<Vec<LanguageIdentifier>, LanguageIdentifierError>
+where
+    I: IntoIterator<Item = J>,
+    J: AsRef<[u8]> + 'a,
+{
+    input
+        .into_iter()
+        .map(|s| LanguageIdentifier::from_bytes(s.as_ref()))
+        .collect()
+}
+
+pub fn convert_vec_str_to_langids_lossy<'a, I, J>(input: I) -> Vec<LanguageIdentifier>
+where
+    I: IntoIterator<Item = J>,
+    J: AsRef<[u8]> + 'a,
+{
+    input
+        .into_iter()
+        .filter_map(|t| LanguageIdentifier::from_bytes(t.as_ref()).ok())
+        .collect()
+}