syn 3.0.6

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

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

[dependencies]
syn = { version = "=3.0.6", features = ["full", "extra-traits"] }

[[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@3.0.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/syn@3.0.6
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

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:sha256:99ab8b2406b414858e6c8de0353b9e9e92fc4e7d254dd07d1f73e94b777f20c0","contract":["syn::parse_str parses a basic function into syn::ItemFn with ident and return type","syn::parse_str parses a struct definition into syn::DeriveInput with Data::Struct","syn::parse_str parses a method call into syn::ExprMethodCall with receiver and method ident","syn::parse_str parses a type into syn::Type::Path with segment ident","syn::parse_file parses source code into syn::File with items","syn::parse_str returns an error when Rust syntax is invalid"],"goal":"verify pkg:cargo/syn@3.0.6","kind":"HOW","packages":["pkg:cargo/syn@3.0.6"],"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@3.0.6"],"schemaVersion":1,"subject":"pkg:cargo/syn@3.0.6","verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/syn@3.0.6",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/syn@3.0.6"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

//! Clean-room verification sample for pkg:cargo/syn@3.0.6.

pub use syn::*;

use syn::{parse_file, parse_str, Data, DeriveInput, Expr, File, Item, ItemFn, ReturnType, Type};

fn main() {
    // 1. syn::parse_str parses a basic function into syn::ItemFn with ident and return type
    let item: ItemFn = parse_str("fn compute() -> u32 { 42 }").expect("failed to parse ItemFn");
    assert_eq!(item.sig.ident.to_string(), "compute");
    match item.sig.output {
        ReturnType::Type(_, ref ty) => match **ty {
            Type::Path(ref tp) => {
                assert_eq!(tp.path.segments[0].ident.to_string(), "u32");
            }
            _ => panic!("expected Type::Path for return type"),
        },
        _ => panic!("expected ReturnType::Type"),
    }

    // 2. syn::parse_str parses a struct definition into syn::DeriveInput with Data::Struct
    let input: DeriveInput =
        parse_str("pub struct Config { pub port: u16, pub host: String }")
            .expect("failed to parse DeriveInput");
    assert_eq!(input.ident.to_string(), "Config");
    match input.data {
        Data::Struct(ref s) => {
            assert_eq!(s.fields.len(), 2);
        }
        _ => panic!("expected Data::Struct"),
    }

    // 3. syn::parse_str parses a method call into syn::ExprMethodCall with receiver and method ident
    let expr: Expr = parse_str("service.start()").expect("failed to parse ExprMethodCall");
    match expr {
        Expr::MethodCall(ref call) => {
            assert_eq!(call.method.to_string(), "start");
            assert!(call.args.is_empty());
        }
        _ => panic!("expected Expr::MethodCall"),
    }

    // 4. syn::parse_str parses a type into syn::Type::Path with segment ident
    let ty: Type = parse_str("Option<String>").expect("failed to parse Type");
    match ty {
        Type::Path(ref tp) => {
            assert_eq!(tp.path.segments[0].ident.to_string(), "Option");
        }
        _ => panic!("expected Type::Path"),
    }

    // 5. syn::parse_file parses source code into syn::File with items
    let file: File = parse_file("fn alpha() {} fn beta() {}").expect("failed to parse File");
    assert_eq!(file.items.len(), 2);
    match (&file.items[0], &file.items[1]) {
        (Item::Fn(f1), Item::Fn(f2)) => {
            assert_eq!(f1.sig.ident.to_string(), "alpha");
            assert_eq!(f2.sig.ident.to_string(), "beta");
        }
        _ => panic!("expected Item::Fn"),
    }

    // 6. syn::parse_str returns an error when Rust syntax is invalid
    let invalid = parse_str::<Expr>("fn invalid syntax +++");
    assert!(invalid.is_err(), "expected error for invalid syntax");

    println!("All pkg:cargo/syn@3.0.6 contract assertions passed successfully.");
}