memchr 2.8.3: memchr

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

[[package]]
name = "memchr"
version = "2.8.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cf8baf1c55e62ffcace7a9f06f4bd9cd3f0c4beb022d3b367256b91b87513d98"

[[package]]
name = "sample-memchr"
version = "1.0.0"
dependencies = [
 "memchr",
]

[package]
name = "sample-memchr"
version = "1.0.0"
edition = "2021"
publish = false

[dependencies]
memchr = "=2.8.3"

[[bin]]
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 memchr in pkg:cargo/memchr@2.8.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/memchr@2.8.3
Demonstrate these symbols/APIs:
  - memchr

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:eb5323f41102eac257e405f8d6d5382d5fabfc2a32079be53267a2f989460d8e","contract":["memchr finds first occurrence of a byte in byte slice","memchr returns None when byte is not found","memchr returns None on empty slice","memchr returns earliest index when byte occurs multiple times"],"goal":"verify memchr in pkg:cargo/memchr@2.8.3","kind":"HOW","packages":["pkg:cargo/memchr@2.8.3"],"schemaVersion":1,"symbols":["memchr"]},"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/memchr@2.8.3"],"schemaVersion":1,"subject":"pkg:cargo/memchr@2.8.3","symbols":["memchr"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify memchr in pkg:cargo/memchr@2.8.3",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/memchr@2.8.3"
  ],
  "symbols": [
    "memchr"
  ]
}

//! Clean-room verification sample for memchr.

pub use memchr::*;

use memchr::memchr;

fn main() {
    let text = b"the quick brown fox jumps over the lazy dog";

    // 1. memchr finds first occurrence of a byte
    assert_eq!(memchr(b'q', text), Some(4));
    assert_eq!(memchr(b'z', text), Some(37));
    assert_eq!(memchr(b'!', text), None);

    // 2. memchr returns None on empty haystack
    assert_eq!(memchr(b'a', b""), None);

    // 3. memchr returns earliest index when byte occurs multiple times
    assert_eq!(memchr(b'e', text), Some(2));

    println!("All memchr contract assertions passed successfully.");
}