slab 0.4.12: slab::Slab

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

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

[[package]]
name = "slab"
version = "0.4.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0c790de23124f9ab44544d7ac05d60440adc586479ce501c1d6d7da3cd8c9cf5"

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

[dependencies]
slab = "=0.4.12"

[[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 pkg:cargo/slab@0.4.12
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/slab@0.4.12
Demonstrate these symbols/APIs:
  - slab::Slab

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:b21df9f26e49841cc81683dfc2f6ebba9a18d0da90366e9d2c1a8c37fab82033","contract":["Slab stores values and returns stable usize keys","Slab supports retrieval, mutation, and removal by key","Slab tracks capacity, length, and entry vacation"],"goal":"verify pkg:cargo/slab@0.4.12","kind":"HOW","packages":["pkg:cargo/slab@0.4.12"],"schemaVersion":1,"symbols":["slab::Slab"]},"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/slab@0.4.12"],"schemaVersion":1,"subject":"pkg:cargo/slab@0.4.12","symbols":["slab::Slab"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/slab@0.4.12",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/slab@0.4.12"
  ],
  "symbols": [
    "slab::Slab"
  ]
}

//! Clean-room verification sample for slab.

pub use slab::*;

use slab::Slab;

fn main() {
    // 1. Slab stores values and returns stable usize keys
    let mut slab = Slab::new();
    let k0 = slab.insert("first");
    let k1 = slab.insert("second");
    assert_eq!(slab[k0], "first");
    assert_eq!(slab[k1], "second");
    assert_eq!(slab.len(), 2);
    assert!(!slab.is_empty());

    // 2. Slab supports retrieval, mutation, and removal by key
    if let Some(val) = slab.get_mut(k0) {
        *val = "first_modified";
    }
    assert_eq!(slab.get(k0), Some(&"first_modified"));
    assert_eq!(slab.contains(k0), true);
    let removed = slab.remove(k0);
    assert_eq!(removed, "first_modified");
    assert_eq!(slab.contains(k0), false);
    assert_eq!(slab.get(k0), None);
    assert_eq!(slab.len(), 1);

    // 3. Slab tracks capacity, length, and entry vacation
    let entry = slab.vacant_entry();
    assert_eq!(entry.key(), k0);
    let val_ref = entry.insert("reused_slot");
    assert_eq!(*val_ref, "reused_slot");
    assert_eq!(slab[k0], "reused_slot");
    assert_eq!(slab.len(), 2);

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