memchr 2.8.3: memchr::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::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::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:bac9c992e1e64857497580a51aac790166e0ecce61e171ed97dc449f3eecab64","contract":["memchr finds the first occurrence of a byte in a haystack","memchr returns Some with the 0-based index when byte is present","memchr returns None when byte is not present in haystack","memchr returns None when searching in an empty haystack","memchr returns the earliest index when byte occurs multiple times"],"goal":"verify memchr::memchr in pkg:cargo/memchr@2.8.3","kind":"HOW","packages":["pkg:cargo/memchr@2.8.3"],"schemaVersion":1,"symbols":["memchr::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::memchr"],"verifierAdapter":"cargo@1"}

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

//! Clean-room verification sample for memchr.

pub use memchr::*;

use memchr::memchr;

fn main() {
    // 1. memchr finds the first occurrence of a byte in a haystack
    let text = b"hello world";
    assert_eq!(memchr(b'w', text), Some(6));

    // 2. memchr returns Some with the 0-based index when byte is present
    assert_eq!(memchr(b'h', text), Some(0));
    assert_eq!(memchr(b'd', text), Some(10));

    // 3. memchr returns None when byte is not present in haystack
    assert_eq!(memchr(b'z', text), None);

    // 4. memchr returns None when searching in an empty haystack
    assert_eq!(memchr(b'a', b""), None);

    // 5. memchr returns the earliest index when byte occurs multiple times
    let repeated = b"banana";
    assert_eq!(memchr(b'a', repeated), Some(1));

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