ppv-lite86 0.2.21: ppv_lite86::vec128_storage

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# ppv-lite86 0.2.21 vec128_storage Contracts

## What `search_known_solution` answered
`search_known_solution` returned `NO_SAFE_MATCH` for ppv_lite86::vec128_storage in pkg:cargo/ppv-lite86@0.2.21.

## What a model would have written instead
A model may expect `vec128_storage` to implement `Debug` or `Display` and attempt to use `assert_eq!(v1, v2)`, which fails to compile with `error[E0277]: vec128_storage doesn't implement Debug`. Furthermore, a model might assume constructor methods like `new` exist, whereas conversion is implemented via `From<[u32; 4]>`, `From<&vec128_storage> for &[u32; 4]`, and `Default`.

## How the wrong version fails
Using `assert_eq!(v1, v2)` causes compilation error E0277 because `vec128_storage` is a union and does not implement `Debug`. Direct equality comparison via `PartialEq` (`assert!(v1 == v2)`) works correctly without requiring `Debug`.

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 ppv_lite86::vec128_storage in pkg:cargo/ppv-lite86@0.2.21
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/ppv-lite86@0.2.21
Demonstrate these symbols/APIs:
  - ppv_lite86::vec128_storage

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.

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  "kind": "HOW",
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  "symbols": [
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//! Clean-room verification sample for ppv-lite86.

pub use ppv_lite86::*;

use ppv_lite86::vec128_storage;

fn main() {
    // 1. vec128_storage converts from and into [u32; 4]
    let raw = [10u32, 20, 30, 40];
    let v: vec128_storage = raw.into();
    let out: [u32; 4] = v.into();
    assert_eq!(out, [10, 20, 30, 40]);

    // 2. vec128_storage converts from reference into &[u32; 4]
    let slice: &[u32; 4] = (&v).into();
    assert_eq!(slice, &[10, 20, 30, 40]);

    // 3. vec128_storage converts into [u64; 2]
    let q: [u64; 2] = v.into();
    let expected_q0 = (10u64) | ((20u64) << 32);
    let expected_q1 = (30u64) | ((40u64) << 32);
    assert_eq!(q, [expected_q0, expected_q1]);

    // 4. vec128_storage converts into [u128; 1]
    let o: [u128; 1] = v.into();
    let expected_o = (expected_q0 as u128) | ((expected_q1 as u128) << 64);
    assert_eq!(o, [expected_o]);

    // 5. vec128_storage implements Default initialized to zero
    let def: vec128_storage = Default::default();
    let def_arr: [u32; 4] = def.into();
    assert_eq!(def_arr, [0, 0, 0, 0]);

    // 6. vec128_storage supports equality comparison with PartialEq and Eq
    let same: vec128_storage = raw.into();
    let diff: vec128_storage = [10u32, 20, 30, 41].into();
    assert!(v == same);
    assert!(v != diff);

    // 7. vec128_storage implements Copy and Clone
    let copied = v;
    assert!(copied == v);

    println!("All ppv_lite86 vec128_storage contract assertions passed successfully.");
}