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.

sha256:0c15e861645a7080723e9431ab5fcbc16820d624a856b72ad0bf249ec892da7b

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
2026-09-20T15:07:11Z

Contract

  1. locale macro constructs Locale at compile time for valid language tags
  2. locale macro normalizes casing across language, script, and region subtags
  3. locale macro supports single variant subtag
  4. locale macro supports single unicode extension keyword
  5. locale macro produces Locale matching runtime parsed Locale
  6. locale macro constructs unknown locale for und tag matching Locale::UNKNOWN

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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 "litemap",
 "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"
dependencies = [
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 "serde_derive",
]

[[package]]
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version = "1.0.229"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "67dca2c9c51e58a4791a4b1ed58308b39c64224d349a935ab5039aa360942a48"
dependencies = [
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dependencies = [
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]

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

[[package]]
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checksum = "3ad82d2a33cdc9674dc7465672f271e096168fcdbe0f799d9e6db8c5892679dc"

[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0ec05a11813ea801ff6d75110ad09cd0824ddba17dfe17128ea0d5f68e6c5272"

[[package]]
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version = "0.11.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bb0464e17806c1d976d5cba29399c7f08e516e279e2ba493f63123b5fca67dd8"
dependencies = [
 "serde",
 "zerofrom",
]
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:sha256:4c277dc0ddfd131f15959dbd95f1903dece3179a1d1b482e03d0d3821405c210","contract":["locale macro constructs Locale at compile time for valid language tags","locale macro normalizes casing across language, script, and region subtags","locale macro supports single variant subtag","locale macro supports single unicode extension keyword","locale macro produces Locale matching runtime parsed Locale","locale macro constructs unknown locale for und tag matching Locale::UNKNOWN"],"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 macro.

pub use icu_locale_core::*;
test/contract.rs
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.");
}

Origin Seeder

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