icu_locale_core 2.3.0: icu_locale_core::langid

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify icu_locale_core::langid in pkg:cargo/icu_locale_core@2.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/icu_locale_core@2.3.0
Demonstrate these symbols/APIs:
  - icu_locale_core::langid

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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{
  "schemaVersion": 1,
  "goal": "verify icu_locale_core::langid in pkg:cargo/icu_locale_core@2.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/icu_locale_core@2.3.0"
  ],
  "symbols": [
    "icu_locale_core::langid"
  ]
}

//! Clean-room verification sample for icu_locale_core::langid.

pub use icu_locale_core::*;

use icu_locale_core::{langid, LanguageIdentifier};
use icu_locale_core::subtags::{language, region, script, variant};

fn main() {
    // 1. langid macro constructs LanguageIdentifier at compile time for valid BCP-47 literals
    const EN_US: LanguageIdentifier = langid!("en-US");
    assert_eq!(EN_US.language, language!("en"));
    assert_eq!(EN_US.script, None);
    assert_eq!(EN_US.region, Some(region!("US")));
    assert_eq!(EN_US.variants.len(), 0);

    // 2. langid macro normalizes casing across language, script, region, and single variant subtags
    const NORMALIZED: LanguageIdentifier = langid!("eN-latn-Us-Valencia");
    assert_eq!(NORMALIZED.language, language!("en"));
    assert_eq!(NORMALIZED.script, Some(script!("Latn")));
    assert_eq!(NORMALIZED.region, Some(region!("US")));
    assert_eq!(NORMALIZED.variants.first(), Some(&variant!("valencia")));

    // 3. LanguageIdentifier created by langid correctly identifies the undefined language tag
    const UND: LanguageIdentifier = langid!("und");
    assert!(UND.is_unknown());
    assert_eq!(UND, LanguageIdentifier::UNKNOWN);

    // 4. LanguageIdentifier supports normalizing equality comparison against unnormalized BCP-47 strings
    let zh_hant_tw = langid!("zh-Hant-TW");
    assert!(zh_hant_tw.normalizing_eq("ZH-hant-tw"));
    assert!(zh_hant_tw.normalizing_eq("zh-Hant-TW"));
    assert!(!zh_hant_tw.normalizing_eq("zh-Hans-CN"));

    // 5. LanguageIdentifier instances support equality, hashing, and total structural ordering
    let id1 = langid!("de-AT");
    let id2 = langid!("de-AT");
    let id3 = langid!("de-DE");
    assert_eq!(id1, id2);
    assert_ne!(id1, id3);
    assert_eq!(id1.total_cmp(&id2), core::cmp::Ordering::Equal);
    assert_ne!(id1.total_cmp(&id3), core::cmp::Ordering::Equal);

    println!("All icu_locale_core::langid contract assertions passed successfully.");
}