icu_locale_core 2.3.0: icu_locale_core::locale

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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::locale 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::locale

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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  "kind": "HOW",
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  "symbols": [
    "icu_locale_core::locale"
  ]
}

//! Clean-room verification sample for icu_locale_core::locale macro.

pub use icu_locale_core::*;

use icu_locale_core::{
    extensions::unicode::{key, value},
    locale,
    subtags::{language, region, script, variant},
    Locale,
};

fn main() {
    // 1. locale macro constructs Locale at compile time for valid language tags
    const EN_US: Locale = locale!("en-US");
    assert_eq!(EN_US.id.language, language!("en"));
    assert_eq!(EN_US.id.script, None);
    assert_eq!(EN_US.id.region, Some(region!("US")));
    assert!(EN_US.id.variants.is_empty());
    assert!(EN_US.extensions.is_empty());

    // 2. locale macro normalizes casing across language, script, and region subtags
    const NORMALIZED: Locale = locale!("EN-latn-us");
    assert_eq!(NORMALIZED.id.language, language!("en"));
    assert_eq!(NORMALIZED.id.script, Some(script!("Latn")));
    assert_eq!(NORMALIZED.id.region, Some(region!("US")));
    assert_eq!(NORMALIZED.to_string(), "en-Latn-US");

    // 3. locale macro supports single variant subtag
    const WITH_VARIANT: Locale = locale!("en-US-posix");
    assert_eq!(WITH_VARIANT.id.language, language!("en"));
    assert_eq!(WITH_VARIANT.id.region, Some(region!("US")));
    assert_eq!(WITH_VARIANT.id.variants.get(0), Some(&variant!("posix")));
    assert_eq!(WITH_VARIANT.to_string(), "en-US-posix");

    // 4. locale macro supports single unicode extension keyword
    const WITH_KEYWORD: Locale = locale!("zh-Hans-CN-u-nu-thai");
    assert_eq!(WITH_KEYWORD.id.language, language!("zh"));
    assert_eq!(WITH_KEYWORD.id.script, Some(script!("Hans")));
    assert_eq!(WITH_KEYWORD.id.region, Some(region!("CN")));
    assert_eq!(
        WITH_KEYWORD.extensions.unicode.keywords.get(&key!("nu")),
        Some(&value!("thai"))
    );
    assert_eq!(WITH_KEYWORD.to_string(), "zh-Hans-CN-u-nu-thai");

    // 5. locale macro produces Locale matching runtime parsed Locale
    let runtime_loc: Locale = "de-AT-u-ca-buddhist".parse().expect("valid locale");
    let const_loc: Locale = locale!("de-AT-u-ca-buddhist");
    assert_eq!(const_loc, runtime_loc);
    assert!(const_loc.normalizing_eq("DE-at-U-ca-BUDDHIST"));

    // 6. locale macro constructs unknown locale for und tag matching Locale::UNKNOWN
    const UNKNOWN_LOC: Locale = locale!("und");
    assert_eq!(UNKNOWN_LOC, Locale::UNKNOWN);
    assert!(UNKNOWN_LOC.extensions.is_empty());

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