unicode-ident 1.0.24: unicode_ident::is_xid_continue

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

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

[[package]]
name = "unicode-ident"
version = "1.0.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"

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

[dependencies]
unicode-ident = "=1.0.24"

[[bin]]
name = "contract"
path = "test/contract.rs"

# Notes on unicode-ident Unicode Property Classification

- **What `search_known_solution` answered**: Returned `NO_SAFE_MATCH` — no safe verified match existed for `verify unicode_ident::is_xid_continue in pkg:cargo/unicode-ident@1.0.24`.
- **What a model would have written instead**: A model often assumes that an underscore (`_`) is rejected by identifier continuation checks, or confuses `is_xid_start` with `is_xid_continue`, or assumes non-ASCII combining characters (e.g. `\u{0300}`) are punctuation and thus rejected, or assumes characters like `$` or `-` are valid continuation characters without syntax escapes.
- **How the wrong version fails**: Under UAX #31, `is_xid_continue` accepts ASCII alphanumeric characters, underscore `_`, and combining marks, while rejecting punctuation (`$`, `-`, `+`, etc.) and symbols. Assuming otherwise leads to incorrect token boundaries and syntax errors during lexing.

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_continue 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_continue

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:ef06e595fd37b036ccb49e01fb4a51fe30b8b4609e130daee6fc5038f80c6616","contract":["is_xid_continue classifies ASCII alphabetic characters and underscore as valid identifier continuation characters","is_xid_continue classifies ASCII decimal digits as valid identifier continuation characters","is_xid_continue rejects ASCII whitespace, control characters, and punctuation","is_xid_continue classifies non-ASCII Unicode alphabetic and ideographic characters as valid identifier continuation characters","is_xid_continue classifies non-ASCII continuation characters such as combining marks as valid identifier continuation characters","is_xid_continue rejects Unicode symbols and punctuation characters"],"goal":"verify unicode_ident::is_xid_continue 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_continue"]},"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/unicode-ident@1.0.24"],"schemaVersion":1,"subject":"pkg:cargo/unicode-ident@1.0.24","symbols":["unicode_ident::is_xid_continue"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify unicode_ident::is_xid_continue in pkg:cargo/unicode-ident@1.0.24",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/unicode-ident@1.0.24"
  ],
  "symbols": [
    "unicode_ident::is_xid_continue"
  ]
}

//! Clean-room verification sample for unicode-ident.

pub use unicode_ident::*;

use unicode_ident::is_xid_continue;

fn main() {
    // 1. ASCII alphabetic characters and underscore
    assert!(is_xid_continue('a'));
    assert!(is_xid_continue('z'));
    assert!(is_xid_continue('A'));
    assert!(is_xid_continue('Z'));
    assert!(is_xid_continue('_'));

    // 2. ASCII decimal digits
    for ch in '0'..='9' {
        assert!(is_xid_continue(ch));
    }

    // 3. ASCII whitespace, control characters, and punctuation
    assert!(!is_xid_continue(' '));
    assert!(!is_xid_continue('\t'));
    assert!(!is_xid_continue('\n'));
    assert!(!is_xid_continue('\r'));
    assert!(!is_xid_continue('\0'));
    assert!(!is_xid_continue('-'));
    assert!(!is_xid_continue('+'));
    assert!(!is_xid_continue('*'));
    assert!(!is_xid_continue('/'));
    assert!(!is_xid_continue('='));
    assert!(!is_xid_continue('$'));
    assert!(!is_xid_continue('@'));
    assert!(!is_xid_continue('!'));
    assert!(!is_xid_continue('#'));
    assert!(!is_xid_continue('%'));
    assert!(!is_xid_continue('^'));
    assert!(!is_xid_continue('&'));
    assert!(!is_xid_continue('('));
    assert!(!is_xid_continue(')'));
    assert!(!is_xid_continue('['));
    assert!(!is_xid_continue(']'));
    assert!(!is_xid_continue('{'));
    assert!(!is_xid_continue('}'));
    assert!(!is_xid_continue(';'));
    assert!(!is_xid_continue(':'));
    assert!(!is_xid_continue(','));
    assert!(!is_xid_continue('.'));
    assert!(!is_xid_continue('<'));
    assert!(!is_xid_continue('>'));
    assert!(!is_xid_continue('?'));
    assert!(!is_xid_continue('~'));
    assert!(!is_xid_continue('`'));
    assert!(!is_xid_continue('|'));
    assert!(!is_xid_continue('\\'));
    assert!(!is_xid_continue('\''));
    assert!(!is_xid_continue('"'));

    // 4. Non-ASCII Unicode alphabetic and ideographic characters
    assert!(is_xid_continue('α')); // Greek lowercase alpha
    assert!(is_xid_continue('Ω')); // Greek uppercase omega
    assert!(is_xid_continue('д')); // Cyrillic lowercase de
    assert!(is_xid_continue('Д')); // Cyrillic uppercase de
    assert!(is_xid_continue('中')); // CJK unified ideograph
    assert!(is_xid_continue('文')); // CJK unified ideograph
    assert!(is_xid_continue('あ')); // Hiragana
    assert!(is_xid_continue('ア')); // Katakana
    assert!(is_xid_continue('한')); // Hangul syllable

    // 5. Non-ASCII continuation characters such as combining marks
    assert!(is_xid_continue('\u{0300}')); // Combining grave accent (Mn)
    assert!(is_xid_continue('\u{0301}')); // Combining acute accent (Mn)
    assert!(is_xid_continue('\u{0902}')); // Devanagari sign anusvara (Mn)
    assert!(is_xid_continue('\u{0903}')); // Devanagari sign visarga (Mc)

    // 6. Non-ASCII punctuation and symbols
    assert!(!is_xid_continue('©')); // Copyright sign (So)
    assert!(!is_xid_continue('•')); // Bullet (Po)
    assert!(!is_xid_continue('§')); // Section sign (Po)
    assert!(!is_xid_continue('→')); // Rightwards arrow (Sm)
    assert!(!is_xid_continue('€')); // Euro sign (Sc)
    assert!(!is_xid_continue('✓')); // Check mark (So)
    assert!(!is_xid_continue('★')); // Black star (So)

    println!("All unicode_ident::is_xid_continue assertions passed.");
}