syn 3.0.3: syn

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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dependencies = [
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publish = false

[dependencies]
syn = { version = "=3.0.3", 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 syn in pkg:cargo/syn@3.0.3
Kind: HOW

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

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:sha256:00dd79a5f86df50f85cd806c657c508faeb93763902daf3c65f2784452745cc2","contract":["syn::parse_str parses a function definition into an ItemFn with signature and visibility","syn::parse_str parses a struct definition with derive attributes into a DeriveInput","syn::parse_str parses arithmetic binary expressions into an Expr","syn::parse_str parses reference and generic types into a Type","syn::parse_str parses variable let bindings into a Stmt","syn::parse_file parses full Rust source code with multiple items into a File"],"goal":"verify syn in pkg:cargo/syn@3.0.3","kind":"HOW","packages":["pkg:cargo/syn@3.0.3"],"schemaVersion":1,"symbols":["syn"]},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","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","symbols":["syn"],"verifierAdapter":"cargo@1"}

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

//! Clean-room verification sample for syn.

pub use syn::*;

use syn::{parse_str, BinOp, Data, DeriveInput, Expr, File, ItemFn, Stmt, Type, Visibility};

fn main() {
    // 1. syn::parse_str parses a function definition into an ItemFn with signature and visibility
    let fn_code = "pub fn add(a: i32, b: i32) -> i32 { a + b }";
    let parsed_fn: ItemFn = parse_str(fn_code).expect("failed to parse ItemFn");
    assert_eq!(parsed_fn.sig.ident.to_string(), "add");
    assert_eq!(parsed_fn.sig.inputs.len(), 2);
    assert!(matches!(parsed_fn.vis, Visibility::Public(_)));

    // 2. syn::parse_str parses a struct definition with derive attributes into a DeriveInput
    let struct_code = r#"
        #[derive(Debug, Clone)]
        pub struct Point {
            pub x: f64,
            pub y: f64,
        }
    "#;
    let parsed_struct: DeriveInput = parse_str(struct_code).expect("failed to parse DeriveInput");
    assert_eq!(parsed_struct.ident.to_string(), "Point");
    assert_eq!(parsed_struct.attrs.len(), 1);
    if let Data::Struct(data_struct) = &parsed_struct.data {
        assert_eq!(data_struct.fields.len(), 2);
    } else {
        panic!("expected struct data");
    }

    // 3. syn::parse_str parses arithmetic binary expressions into an Expr
    let expr_code = "a * 2 + b";
    let parsed_expr: Expr = parse_str(expr_code).expect("failed to parse Expr");
    if let Expr::Binary(bin) = &parsed_expr {
        assert!(matches!(bin.op, BinOp::Add(_)));
    } else {
        panic!("expected binary expression");
    }

    // 4. syn::parse_str parses reference and generic types into a Type
    let type_code = "&'a mut Vec<String>";
    let parsed_type: Type = parse_str(type_code).expect("failed to parse Type");
    if let Type::Reference(type_ref) = &parsed_type {
        assert!(type_ref.mutability.is_some());
        assert_eq!(type_ref.lifetime.as_ref().unwrap().ident.to_string(), "a");
    } else {
        panic!("expected reference type");
    }

    // 5. syn::parse_str parses variable let bindings into a Stmt
    let stmt_code = "let x: i32 = 42;";
    let parsed_stmt: Stmt = parse_str(stmt_code).expect("failed to parse Stmt");
    if let Stmt::Local(local) = &parsed_stmt {
        assert!(local.init.is_some());
    } else {
        panic!("expected local let statement");
    }

    // 6. syn::parse_file parses full Rust source code with multiple items into a File
    let file_code = r#"
        use std::collections::HashMap;

        fn helper() -> bool { true }

        struct State {
            count: usize,
        }
    "#;
    let parsed_file: File = syn::parse_file(file_code).expect("failed to parse File");
    assert_eq!(parsed_file.items.len(), 3);

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