syn 3.0.3: syn::ExprBinary

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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::ExprBinary 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::ExprBinary

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.

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  "kind": "HOW",
  "packages": [
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  "symbols": [
    "syn::ExprBinary"
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}

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

pub use syn::*;

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

fn main() {
    // 1. syn::parse_str parses binary arithmetic expressions into ExprBinary with BinOp::Add and BinOp::Mul
    let expr_add: Expr = syn::parse_str("x + y").expect("parse add");
    match expr_add {
        Expr::Binary(ExprBinary { op: BinOp::Add(_), left, right, .. }) => {
            assert!(matches!(*left, Expr::Path(_)));
            assert!(matches!(*right, Expr::Path(_)));
        }
        _ => panic!("expected ExprBinary with Add"),
    }
    let expr_mul: Expr = syn::parse_str("x * y").expect("parse mul");
    match expr_mul {
        Expr::Binary(ExprBinary { op: BinOp::Mul(_), .. }) => {}
        _ => panic!("expected ExprBinary with Mul"),
    }

    // 2. syn::parse_str parses binary comparison operations into ExprBinary with BinOp::Eq and BinOp::Lt
    let expr_eq: Expr = syn::parse_str("a == b").expect("parse eq");
    match expr_eq {
        Expr::Binary(ExprBinary { op: BinOp::Eq(_), .. }) => {}
        _ => panic!("expected ExprBinary with Eq"),
    }
    let expr_lt: Expr = syn::parse_str("a < b").expect("parse lt");
    match expr_lt {
        Expr::Binary(ExprBinary { op: BinOp::Lt(_), .. }) => {}
        _ => panic!("expected ExprBinary with Lt"),
    }

    // 3. syn::parse_str parses logical AND and OR operations into ExprBinary with BinOp::And and BinOp::Or
    let expr_and: Expr = syn::parse_str("cond1 && cond2").expect("parse and");
    match expr_and {
        Expr::Binary(ExprBinary { op: BinOp::And(_), .. }) => {}
        _ => panic!("expected ExprBinary with And"),
    }
    let expr_or: Expr = syn::parse_str("cond1 || cond2").expect("parse or");
    match expr_or {
        Expr::Binary(ExprBinary { op: BinOp::Or(_), .. }) => {}
        _ => panic!("expected ExprBinary with Or"),
    }

    // 4. ExprBinary preserves left and right operands as Box<Expr>
    let expr_lit: Expr = syn::parse_str("10 + 20").expect("parse int addition");
    if let Expr::Binary(ExprBinary { left, right, .. }) = expr_lit {
        match (*left, *right) {
            (Expr::Lit(l), Expr::Lit(r)) => {
                match (l.lit, r.lit) {
                    (syn::Lit::Int(li), syn::Lit::Int(ri)) => {
                        assert_eq!(li.base10_parse::<i32>().unwrap(), 10);
                        assert_eq!(ri.base10_parse::<i32>().unwrap(), 20);
                    }
                    _ => panic!("expected Lit::Int"),
                }
            }
            _ => panic!("expected Expr::Lit operands"),
        }
    } else {
        panic!("expected ExprBinary");
    }

    // 5. syn::parse_str parses bitwise operations into ExprBinary with BinOp::BitXor and BinOp::BitAnd
    let expr_xor: Expr = syn::parse_str("flags ^ mask").expect("parse xor");
    match expr_xor {
        Expr::Binary(ExprBinary { op: BinOp::BitXor(_), .. }) => {}
        _ => panic!("expected ExprBinary with BitXor"),
    }
    let expr_bitand: Expr = syn::parse_str("flags & mask").expect("parse bitand");
    match expr_bitand {
        Expr::Binary(ExprBinary { op: BinOp::BitAnd(_), .. }) => {}
        _ => panic!("expected ExprBinary with BitAnd"),
    }

    // 6. syn::parse_str parses nested binary expressions preserving left-associative tree structure
    let expr_nested: Expr = syn::parse_str("a + b + c").expect("parse chained addition");
    match expr_nested {
        Expr::Binary(ExprBinary { op: BinOp::Add(_), left, right, .. }) => {
            match *right {
                Expr::Path(p) => assert_eq!(p.path.segments[0].ident.to_string(), "c"),
                _ => panic!("expected right operand to be c"),
            }
            match *left {
                Expr::Binary(ExprBinary { op: BinOp::Add(_), left: inner_left, right: inner_right, .. }) => {
                    match (*inner_left, *inner_right) {
                        (Expr::Path(p1), Expr::Path(p2)) => {
                            assert_eq!(p1.path.segments[0].ident.to_string(), "a");
                            assert_eq!(p2.path.segments[0].ident.to_string(), "b");
                        }
                        _ => panic!("expected inner operands to be a and b"),
                    }
                }
                _ => panic!("expected left operand to be ExprBinary"),
            }
        }
        _ => panic!("expected ExprBinary"),
    }

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