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+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+//! Parsing, manipulating, and serializing Unicode Language and Locale Identifiers.
+//!
+//! This module is published as its own crate ([`icu_locid`](https://docs.rs/icu_locid/latest/icu_locid/))
+//! and as part of the [`icu`](https://docs.rs/icu/latest/icu/) crate. See the latter for more details on the ICU4X project.
+//!
+//! The module provides algorithms for parsing a string into a well-formed language or locale identifier
+//! as defined by [`UTS #35: Unicode LDML 3. Unicode Language and Locale Identifiers`].
+//!
+//! [`Locale`] is the most common structure to use for storing information about a language,
+//! script, region, variants and extensions. In almost all cases, this struct should be used as the
+//! base unit for all locale management operations.
+//!
+//! [`LanguageIdentifier`] is a strict subset of [`Locale`] which can be useful in a narrow range of
+//! cases where [`Unicode Extensions`] are not relevant.
+//!
+//! If in doubt, use [`Locale`].
+//!
+//! # Examples
+//!
+//! ```
+//! use icu::locid::subtags::{Language, Region};
+//! use icu::locid::Locale;
+//!
+//! let mut loc: Locale = "en-US".parse().expect("Parsing failed.");
+//!
+//! let lang: Language = "en".parse().expect("Parsing failed.");
+//! let region: Region = "US".parse().expect("Parsing failed.");
+//!
+//! assert_eq!(loc.id.language, lang);
+//! assert_eq!(loc.id.script, None);
+//! assert_eq!(loc.id.region, Some(region));
+//! assert_eq!(loc.id.variants.len(), 0);
+//!
+//! let region: Region = "GB".parse().expect("Parsing failed.");
+//! loc.id.region = Some(region);
+//!
+//! assert_eq!(loc.to_string(), "en-GB");
+//! ```
+//!
+//! ## Macros
+//!
+//! ```rust
+//! use icu::locid::{
+//!     langid, subtags_language as language, subtags_region as region,
+//! };
+//!
+//! let lid = langid!("EN_US");
+//!
+//! assert_eq!(lid.language, language!("en"));
+//! assert_eq!(lid.region, Some(region!("US")));
+//! ```
+
+//!
+//! For more details, see [`Locale`] and [`LanguageIdentifier`].
+//!
+//! [`UTS #35: Unicode LDML 3. Unicode Language and Locale Identifiers`]: https://unicode.org/reports/tr35/tr35.html#Unicode_Language_and_Locale_Identifiers
+//! [`ICU4X`]: ../icu/index.html
+//! [`Unicode Extensions`]: extensions
+
+// https://github.com/unicode-org/icu4x/blob/main/docs/process/boilerplate.md#library-annotations
+#![cfg_attr(not(any(test, feature = "std")), no_std)]
+#![cfg_attr(
+    not(test),
+    deny(
+        clippy::indexing_slicing,
+        clippy::unwrap_used,
+        clippy::expect_used,
+        clippy::panic,
+        clippy::exhaustive_structs,
+        clippy::exhaustive_enums,
+        // TODO(#2266): enable missing_debug_implementations,
+    )
+)]
+#![warn(missing_docs)]
+
+extern crate alloc;
+
+#[macro_use]
+mod helpers;
+
+mod langid;
+mod locale;
+mod macros;
+mod ordering;
+mod parser;
+
+pub use langid::LanguageIdentifier;
+pub use locale::Locale;
+pub use ordering::SubtagOrderingResult;
+pub use parser::errors::ParserError;
+
+pub mod extensions;
+pub mod subtags;
+pub mod zerovec;
+
+#[cfg(feature = "serde")]
+mod serde;