syn 3.0.3: syn::Type

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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::Type 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::Type

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:sha256:1c5e15e05a1ef5078dc5c3af1fedf6cd7e5bbe709233367193e7df8e034ea6e5","contract":["syn::parse_str parses path types into Type::Path with path segments","syn::parse_str parses reference types with lifetimes into Type::Reference","syn::parse_str parses fixed-size array types into Type::Array","syn::parse_str parses dynamically-sized slice types into Type::Slice","syn::parse_str parses tuple types into Type::Tuple","syn::parse_str parses raw pointer types into Type::Ptr with PointerMutability","syn::parse_str parses function pointer types into Type::FnPtr","syn::parse_str parses the never type into Type::Never","syn::parse_str rejects invalid type syntax with a parse error"],"goal":"verify syn::Type in pkg:cargo/syn@3.0.3","kind":"HOW","packages":["pkg:cargo/syn@3.0.3"],"schemaVersion":1,"symbols":["syn::Type"]},"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","symbols":["syn::Type"],"verifierAdapter":"cargo@1"}

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

//! Clean-room verification sample for syn::Type.

pub use syn::*;

use syn::{
    parse_str, PointerMutability, Type, TypeArray, TypeFnPtr, TypePath, TypePtr, TypeReference,
    TypeSlice, TypeTuple,
};

fn main() {
    // 1. syn::parse_str parses path types into Type::Path with path segments
    let path_ty: Type = parse_str("std::collections::HashMap<String, i32>").expect("valid path type");
    match path_ty {
        Type::Path(TypePath { ref qself, ref path, .. }) => {
            assert!(qself.is_none());
            assert_eq!(path.segments.len(), 3);
            assert_eq!(path.segments.last().unwrap().ident.to_string(), "HashMap");
        }
        _ => panic!("expected Type::Path"),
    }

    // 2. syn::parse_str parses reference types with lifetimes into Type::Reference
    let ref_ty: Type = parse_str("&'a mut [u8]").expect("valid reference type");
    match ref_ty {
        Type::Reference(TypeReference { ref lifetime, ref mutability, .. }) => {
            assert_eq!(lifetime.as_ref().unwrap().ident.to_string(), "a");
            assert!(mutability.is_some());
        }
        _ => panic!("expected Type::Reference"),
    }

    // 3. syn::parse_str parses fixed-size array types into Type::Array
    let array_ty: Type = parse_str("[u8; 64]").expect("valid array type");
    match array_ty {
        Type::Array(TypeArray { ref elem, .. }) => {
            assert!(matches!(**elem, Type::Path(_)));
        }
        _ => panic!("expected Type::Array"),
    }

    // 4. syn::parse_str parses dynamically-sized slice types into Type::Slice
    let slice_ty: Type = parse_str("[i32]").expect("valid slice type");
    match slice_ty {
        Type::Slice(TypeSlice { ref elem, .. }) => {
            assert!(matches!(**elem, Type::Path(_)));
        }
        _ => panic!("expected Type::Slice"),
    }

    // 5. syn::parse_str parses tuple types into Type::Tuple
    let tuple_ty: Type = parse_str("(i32, String, bool)").expect("valid tuple type");
    match tuple_ty {
        Type::Tuple(TypeTuple { ref elems, .. }) => {
            assert_eq!(elems.len(), 3);
        }
        _ => panic!("expected Type::Tuple"),
    }

    // 6. syn::parse_str parses raw pointer types into Type::Ptr with PointerMutability
    let ptr_ty: Type = parse_str("*const u8").expect("valid pointer type");
    match ptr_ty {
        Type::Ptr(TypePtr { mutability, .. }) => {
            assert!(matches!(mutability, PointerMutability::Const(_)));
        }
        _ => panic!("expected Type::Ptr"),
    }

    // 7. syn::parse_str parses function pointer types into Type::FnPtr
    let fn_ty: Type = parse_str("fn(i32, bool) -> usize").expect("valid fn pointer type");
    match fn_ty {
        Type::FnPtr(TypeFnPtr { ref inputs, .. }) => {
            assert_eq!(inputs.len(), 2);
        }
        _ => panic!("expected Type::FnPtr"),
    }

    // 8. syn::parse_str parses the never type into Type::Never
    let never_ty: Type = parse_str("!").expect("valid never type");
    assert!(matches!(never_ty, Type::Never(_)));

    // 9. syn::parse_str rejects invalid type syntax with a parse error
    let invalid = parse_str::<Type>("fn(invalid syntax !!!");
    assert!(invalid.is_err());

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