syn 3.0.3: syn::BinOp

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[[bin]]
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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::BinOp 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::BinOp
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:cbf9f4a37f1797cd1c8360997c93cafe9595bc02941f0cdf78e6c3c282ef5bc7","contract":["parse_str parses binary addition into ExprBinary with BinOp::Add","parse_str parses binary multiplication into ExprBinary with BinOp::Mul","parse_str parses compound assignment into ExprBinary with BinOp::AddAssign","parse_str parses equality comparison into ExprBinary with BinOp::Eq","parse_str parses binary operator token directly into BinOp"],"goal":"verify syn::BinOp in pkg:cargo/syn@3.0.3","kind":"HOW","packages":["pkg:cargo/syn@3.0.3"],"schemaVersion":1,"symbols":["syn::BinOp"]},"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::BinOp"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify syn::BinOp in pkg:cargo/syn@3.0.3",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/syn@3.0.3"
  ],
  "symbols": [
    "syn::BinOp"
  ],
  "runtimeConditions": {
    "ecosystem": "cargo",
    "language": "rust",
    "packageManager": "cargo"
  }
}

//! Clean-room verification sample for syn.

pub use syn::*;

use syn::{parse_str, BinOp, Expr, ExprBinary};

fn main() {
    // 1. parse_str parses binary addition into ExprBinary with BinOp::Add
    let expr: Expr = parse_str("a + b").expect("parse addition expression");
    match expr {
        Expr::Binary(ExprBinary { op: BinOp::Add(_), .. }) => {}
        _ => panic!("expected Expr::Binary with BinOp::Add"),
    }

    // 2. parse_str parses binary multiplication into ExprBinary with BinOp::Mul
    let expr: Expr = parse_str("x * y").expect("parse multiplication expression");
    match expr {
        Expr::Binary(ExprBinary { op: BinOp::Mul(_), .. }) => {}
        _ => panic!("expected Expr::Binary with BinOp::Mul"),
    }

    // 3. parse_str parses compound assignment into ExprBinary with BinOp::AddAssign
    let expr: Expr = parse_str("counter += 1").expect("parse compound addition assignment");
    match expr {
        Expr::Binary(ExprBinary { op: BinOp::AddAssign(_), .. }) => {}
        _ => panic!("expected Expr::Binary with BinOp::AddAssign"),
    }

    // 4. parse_str parses equality comparison into ExprBinary with BinOp::Eq
    let expr: Expr = parse_str("a == b").expect("parse equality expression");
    match expr {
        Expr::Binary(ExprBinary { op: BinOp::Eq(_), .. }) => {}
        _ => panic!("expected Expr::Binary with BinOp::Eq"),
    }

    // 5. parse_str parses binary operator token directly into BinOp
    let op_add: BinOp = parse_str("+").expect("parse BinOp::Add token");
    assert!(matches!(op_add, BinOp::Add(_)));

    let op_sub: BinOp = parse_str("-").expect("parse BinOp::Sub token");
    assert!(matches!(op_sub, BinOp::Sub(_)));

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