syn 3.0.3

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

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dependencies = [
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dependencies = [
 "proc-macro2",
]

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

[[package]]
name = "syn"
version = "3.0.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "53e9bae58849f64dfa4f5d5ae372c8341f7305f82a3868709269343628b659a3"
dependencies = [
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]

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

[dependencies]
syn = { version = "=3.0.3", features = ["full", "extra-traits", "parsing", "printing", "derive", "clone-impls", "proc-macro"] }

[[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/syn@3.0.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/syn@3.0.3

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:f79f0d23c1c7977b89937369430a5e39ac1e52923ce1e34c944917e59575f295","contract":["parse_str parses a complete Rust file AST with items","parse_str parses a function item signature and argument list","parse_str parses a struct definition into DeriveInput","parse_str parses binary expressions into an Expr AST","parse_str parses a generic type path into a Type AST"],"goal":"verify pkg:cargo/syn@3.0.3","kind":"HOW","packages":["pkg:cargo/syn@3.0.3"],"schemaVersion":1},"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/syn@3.0.3"],"schemaVersion":1,"subject":"pkg:cargo/syn@3.0.3","verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/syn@3.0.3",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/syn@3.0.3"
  ]
}

//! Clean-room verification sample for syn.

pub use syn::*;

use syn::{parse_str, DeriveInput, Expr, File, ItemFn, Type};

fn main() {
    // 1. parse_str parses a complete Rust file AST with items
    let file: File = parse_str("fn hello() { println!(\"world\"); }").expect("parse file");
    assert_eq!(file.items.len(), 1);

    // 2. parse_str parses a function item signature and argument list
    let item_fn: ItemFn = parse_str("fn add(a: i32, b: i32) -> i32 { a + b }").expect("parse fn");
    assert_eq!(item_fn.sig.ident.to_string(), "add");
    assert_eq!(item_fn.sig.inputs.len(), 2);

    // 3. parse_str parses a struct definition into DeriveInput
    let derive_input: DeriveInput = parse_str("struct Point { x: f64, y: f64 }").expect("parse struct");
    assert_eq!(derive_input.ident.to_string(), "Point");

    // 4. parse_str parses binary expressions into an Expr AST
    let expr: Expr = parse_str("1 + 2 * 3").expect("parse expr");
    let _ = format!("{:?}", expr);

    // 5. parse_str parses a generic type path into a Type AST
    let ty: Type = parse_str("Option<Vec<String>>").expect("parse type");
    let _ = format!("{:?}", ty);

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