CodeSampleX

Sample

icu_locale_core 2.3.0: icu_locale_core::Locale

Verified sample for cargo icu_locale_core 2.3.0: icu_locale_core::Locale. The contract ran on rust 1 · linux alpine/x64 · docker and passed.

sha256:b26610fedecb59e969bf06347f7a63df8a79cc89793ebbfd07264d04de1d261b

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux · alpine · musl x64 cargo

Verification-run environments

Environment Contract Stages Run
rust 1 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · cargo@1rust:1-alpine@sha256:a10e64dd139b…		 2026-09-20

Case

HOW
Goal
verify icu_locale_core::Locale in pkg:cargo/icu_locale_core@2.3.0
Packages
Symbols
  • icu_locale_core::Locale
Created
2026-09-20T14:03:14Z

Contract

  1. locale macro constructs Locale at compile time for valid BCP-47 tags
  2. Locale parses valid language tags with unicode extensions and subtags using try_from_str
  3. Locale rejects invalid language tags and duplicated extensions returning ParseError
  4. Locale normalizes casing across language, script, region and extension subtags
  5. Locale supports normalizing equality, strict byte comparison, and total struct ordering
  6. Locale converts to and from LanguageIdentifier preserving base language tags

Files

  • Cargo.lock
  • Cargo.toml
  • PROMPT.md
  • csx.json
  • spec.json
  • src/lib.rs
  • test/contract.rs

Download the source artifact (tar.gz)

Source

Cargo.lock
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

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dependencies = [
 "proc-macro2",
 "quote",
 "syn",
]

[[package]]
name = "icu_locale_core"
version = "2.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d56e28588da92eee5c3201a6eff33fabdd49b62269c8938d4ff050ce4d900deb"
dependencies = [
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 "serde",
 "tinystr",
 "writeable",
]

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dependencies = [
 "unicode-ident",
]

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dependencies = [
 "proc-macro2",
]

[[package]]
name = "sample-icu-locale-core"
version = "1.0.0"
dependencies = [
 "icu_locale_core",
]

[[package]]
name = "serde"
version = "1.0.229"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4148590afebada386688f18773da617792bf2ef03ffc1e4cbd2b1d45b023e0ba"
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]

[[package]]
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dependencies = [
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dependencies = [
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[[package]]
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checksum = "d245f478577f809a851594d02313b640fb437e0bb33866753cff937863096954"

[[package]]
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[[package]]
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checksum = "0ec05a11813ea801ff6d75110ad09cd0824ddba17dfe17128ea0d5f68e6c5272"

[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bb0464e17806c1d976d5cba29399c7f08e516e279e2ba493f63123b5fca67dd8"
dependencies = [
 "serde",
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]
Cargo.toml
[package]
name = "sample-icu-locale-core"
version = "1.0.0"
edition = "2021"
publish = false

[dependencies]
icu_locale_core = { version = "=2.3.0", features = ["alloc"] }

[[bin]]
name = "contract"
path = "test/contract.rs"
PROMPT.md
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.
csx.json
{"case":{"caseId":"case:sha256:1e0ea075a671a5c86d2eca30293c9cf407a4fb09956bcac281eba4fd09c149c5","contract":["locale macro constructs Locale at compile time for valid BCP-47 tags","Locale parses valid language tags with unicode extensions and subtags using try_from_str","Locale rejects invalid language tags and duplicated extensions returning ParseError","Locale normalizes casing across language, script, region and extension subtags","Locale supports normalizing equality, strict byte comparison, and total struct ordering","Locale converts to and from LanguageIdentifier preserving base language tags"],"goal":"verify icu_locale_core::Locale in pkg:cargo/icu_locale_core@2.3.0","kind":"HOW","packages":["pkg:cargo/icu_locale_core@2.3.0"],"schemaVersion":1,"symbols":["icu_locale_core::Locale"]},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/icu_locale_core@2.3.0"],"schemaVersion":1,"subject":"pkg:cargo/icu_locale_core@2.3.0","symbols":["icu_locale_core::Locale"],"verifierAdapter":"cargo@1"}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify icu_locale_core::Locale in pkg:cargo/icu_locale_core@2.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/icu_locale_core@2.3.0"
  ],
  "symbols": [
    "icu_locale_core::Locale"
  ]
}
src/lib.rs
//! Clean-room verification sample for icu_locale_core Locale.

pub use icu_locale_core::*;
test/contract.rs
use core::cmp::Ordering;
use icu_locale_core::{
    extensions::unicode::{key, value},
    locale,
    subtags::{language, region, script},
    LanguageIdentifier, Locale, ParseError,
};

fn main() {
    // 1. locale macro constructs Locale at compile time for valid BCP-47 tags
    let loc: Locale = locale!("en-US-u-ca-buddhist");
    assert_eq!(loc.id.language, language!("en"));
    assert_eq!(loc.id.script, None);
    assert_eq!(loc.id.region, Some(region!("US")));
    assert_eq!(
        loc.extensions.unicode.keywords.get(&key!("ca")),
        Some(&value!("buddhist"))
    );

    const UNKNOWN_LOC: Locale = Locale::UNKNOWN;
    assert_eq!(UNKNOWN_LOC, locale!("und"));
    assert!(UNKNOWN_LOC.extensions.is_empty());

    // 2. Locale parses valid language tags with unicode extensions and subtags using try_from_str
    let parsed = Locale::try_from_str("zh-Hans-CN-u-nu-thai");
    assert!(parsed.is_ok());
    let parsed_loc = parsed.unwrap();
    assert_eq!(parsed_loc.id.language, language!("zh"));
    assert_eq!(parsed_loc.id.script, Some(script!("Hans")));
    assert_eq!(parsed_loc.id.region, Some(region!("CN")));
    assert_eq!(
        parsed_loc.extensions.unicode.keywords.get(&key!("nu")),
        Some(&value!("thai"))
    );

    let from_bytes = Locale::try_from_utf8(b"fr-CA");
    assert!(from_bytes.is_ok());
    assert_eq!(from_bytes.unwrap().to_string(), "fr-CA");

    // 3. Locale rejects invalid language tags and duplicated extensions returning ParseError
    let invalid_lang = Locale::try_from_str("toolonglanguage");
    assert_eq!(invalid_lang, Err(ParseError::InvalidLanguage));

    let invalid_subtag = Locale::try_from_str("en-??");
    assert_eq!(invalid_subtag, Err(ParseError::InvalidSubtag));

    let dup_ext = Locale::try_from_str("und-u-hc-h12-u-ca-calendar");
    assert_eq!(dup_ext, Err(ParseError::DuplicatedExtension));

    // 4. Locale normalizes casing across language, script, region and extension subtags
    let normalized = Locale::normalize("pL-lAtN-pL-U-HC-H12");
    assert!(normalized.is_ok());
    assert_eq!(normalized.unwrap(), "pl-Latn-PL-u-hc-h12");

    let mixed = Locale::try_from_str("EN-latn-US-u-CA-BUDDHIST").expect("valid");
    assert_eq!(mixed.to_string(), "en-Latn-US-u-ca-buddhist");

    // 5. Locale supports normalizing equality, strict byte comparison, and total struct ordering
    assert!(loc.normalizing_eq("EN-us-U-ca-BUDDHIST"));
    assert!(!loc.normalizing_eq("en-GB"));

    let en_us = locale!("en-US");
    assert_eq!(en_us.strict_cmp(b"en-US"), Ordering::Equal);
    assert_eq!(en_us.strict_cmp(b"ar-SA"), Ordering::Greater);
    assert_eq!(en_us.strict_cmp(b"zh-TW"), Ordering::Less);

    let mut list = vec![
        locale!("zh-TW"),
        locale!("ar-SA"),
        locale!("en-US"),
    ];
    list.sort_by(Locale::total_cmp);
    assert_eq!(list[0], locale!("ar-SA"));
    assert_eq!(list[1], locale!("en-US"));
    assert_eq!(list[2], locale!("zh-TW"));

    // 6. Locale converts to and from LanguageIdentifier preserving base language tags
    let lang_id: LanguageIdentifier = loc.clone().into();
    assert_eq!(lang_id.language, language!("en"));
    assert_eq!(lang_id.region, Some(region!("US")));

    let loc_from_lid: Locale = lang_id.into();
    assert_eq!(loc_from_lid, locale!("en-US"));

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

Origin Seeder

anonymous