Sample
unicode-ident 1.0.24: unicode_ident::is_xid_start
Verified sample for cargo unicode-ident 1.0.24: unicode_ident::is_xid_start. The contract ran on rust 1 · linux alpine/x64 · docker and passed.
sha256:efdb4b85662da43c3c80076d885bb1dd799eca46e2c0ab58e849e1ea319fbf29
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 · 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… |
2026-09-19 |
Case
HOW- Goal
- verify unicode_ident::is_xid_start in pkg:cargo/unicode-ident@1.0.24
- Packages
- Symbols
-
- unicode_ident::is_xid_start
- Created
- 2026-09-17T17:22:20Z
Contract
- unicode_ident::is_xid_start('a') == true
- unicode_ident::is_xid_start('Z') == true
- unicode_ident::is_xid_start('α') == true
- unicode_ident::is_xid_start('_') == false
- unicode_ident::is_xid_start('0') == false
- unicode_ident::is_xid_start(' ') == false
Files
- Cargo.lock
- Cargo.toml
- PROMPT.md
- csx.json
- spec.json
- src/main.rs
- test/contract.rs
Source
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
[[package]]
name = "unicode-ident"
version = "1.0.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
[[package]]
name = "unicode-ident-sample"
version = "0.1.0"
dependencies = [
"unicode-ident",
]
[package]
name = "unicode-ident-sample"
version = "0.1.0"
edition = "2021"
[dependencies]
unicode-ident = "=1.0.24"
[[test]]
name = "contract"
path = "test/contract.rs"
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 unicode_ident::is_xid_start in pkg:cargo/unicode-ident@1.0.24
Kind: HOW
Use EXACTLY these public packages and versions:
- pkg:cargo/unicode-ident@1.0.24
Demonstrate these symbols/APIs:
- unicode_ident::is_xid_start
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.
{"case":{"caseId":"case:sha256:9cc7c7fbc3fb5663c32b1e825064f10806b37fe735885dd00969cdef09534feb","contract":["unicode_ident::is_xid_start('a') == true","unicode_ident::is_xid_start('Z') == true","unicode_ident::is_xid_start('α') == true","unicode_ident::is_xid_start('_') == false","unicode_ident::is_xid_start('0') == false","unicode_ident::is_xid_start(' ') == false"],"goal":"verify unicode_ident::is_xid_start in pkg:cargo/unicode-ident@1.0.24","kind":"HOW","packages":["pkg:cargo/unicode-ident@1.0.24"],"schemaVersion":1,"symbols":["unicode_ident::is_xid_start"]},"contractCommand":["cargo","test","--offline"],"environment":{"arch":"x64","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/unicode-ident@1.0.24"],"schemaVersion":1,"subject":"pkg:cargo/unicode-ident@1.0.24","symbols":["unicode_ident::is_xid_start"],"verifierAdapter":"cargo@1"}
{
"schemaVersion": 1,
"goal": "verify unicode_ident::is_xid_start in pkg:cargo/unicode-ident@1.0.24",
"kind": "HOW",
"packages": [
"pkg:cargo/unicode-ident@1.0.24"
],
"symbols": [
"unicode_ident::is_xid_start"
]
}
use unicode_ident::is_xid_start;
fn main() {
assert!(is_xid_start('a'));
assert!(is_xid_start('Z'));
assert!(is_xid_start('α'));
assert!(!is_xid_start('_'));
assert!(!is_xid_start('0'));
assert!(!is_xid_start(' '));
}
use unicode_ident::is_xid_start;
#[test]
fn contract_is_xid_start() {
assert!(is_xid_start('a'));
assert!(is_xid_start('Z'));
assert!(is_xid_start('α'));
assert!(!is_xid_start('_'));
assert!(!is_xid_start('0'));
assert!(!is_xid_start(' '));
}
Origin Seeder
anonymous