Sample

icu_locale_core 2.3.0: icu_locale_core::langid

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

sha256:24801454efa0614108c2cb94c3aef200f2634f174ed1a858a4bdff04b6491568

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::langid in pkg:cargo/icu_locale_core@2.3.0
Packages: icu_locale_core 2.3.0
Symbols: icu_locale_core::langid
Created: 2026-09-20T14:30:43Z

Contract

langid macro constructs LanguageIdentifier at compile time for valid BCP-47 literals
langid macro normalizes casing across language, script, region, and single variant subtags
LanguageIdentifier created by langid correctly identifies the undefined language tag
LanguageIdentifier supports normalizing equality comparison against unnormalized BCP-47 strings
LanguageIdentifier instances support equality, hashing, and total structural ordering

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

[[package]]
name = "displaydoc"
version = "0.2.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c6232dd377dcc64799954cbd3a9bb882e9cdc1308ccd87b1c098f1fb2eaf82a8"
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 = [
 "displaydoc",
 "litemap",
 "tinystr",
 "writeable",
]

[[package]]
name = "litemap"
version = "0.8.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "47d9d19d1d6efa0109d2f65ff4c85cddd50bd572e5a00127ab10987290bcefae"

[[package]]
name = "proc-macro2"
version = "1.0.107"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "985e7ec9bb745e6ce6535b544d84d6cd6f7ad8bd711c398938ae983b91a766d9"
dependencies = [
 "unicode-ident",
]

[[package]]
name = "quote"
version = "1.0.47"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1fbf4db142a473a8d80c26bbf18454ed458bf8d26c8219c331daecfdbd079001"
dependencies = [
 "proc-macro2",
]

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

[[package]]
name = "syn"
version = "3.0.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8593e8e72159ed2257d083c7a454a85cbf854f37a0966d8d483aff8c8a3ebcee"
dependencies = [
 "proc-macro2",
 "quote",
 "unicode-ident",
]

[[package]]
name = "tinystr"
version = "0.8.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b1e27c91459209c2986af3dcf603a5a74a4368754ce37414f59acc971167f643"
dependencies = [
 "displaydoc",
]

[[package]]
name = "unicode-ident"
version = "1.0.26"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d245f478577f809a851594d02313b640fb437e0bb33866753cff937863096954"

[[package]]
name = "writeable"
version = "0.6.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3ad82d2a33cdc9674dc7465672f271e096168fcdbe0f799d9e6db8c5892679dc"

Cargo.toml

[package]
name = "sample-icu-locale-core"
version = "1.0.0"
edition = "2021"
publish = false

[dependencies]
icu_locale_core = "=2.3.0"

[[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::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.

csx.json

{"case":{"caseId":"case:sha256:93e8bea5e36270af707569d2ba961a602e47b70a04da28233860032c3d82f376","contract":["langid macro constructs LanguageIdentifier at compile time for valid BCP-47 literals","langid macro normalizes casing across language, script, region, and single variant subtags","LanguageIdentifier created by langid correctly identifies the undefined language tag","LanguageIdentifier supports normalizing equality comparison against unnormalized BCP-47 strings","LanguageIdentifier instances support equality, hashing, and total structural ordering"],"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"],"schemaVersion":1,"symbols":["icu_locale_core::langid"]},"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::langid"],"verifierAdapter":"cargo@1"}

spec.json

{
  "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"
  ]
}

src/lib.rs

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

pub use icu_locale_core::*;

test/contract.rs

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.");
}

Origin Seeder

anonymous