syn 3.0.3: syn::ExprMethodCall

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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::ExprMethodCall 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::ExprMethodCall

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.
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  - Keep it under 200 files and 256KB packed.

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  "kind": "HOW",
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  "symbols": [
    "syn::ExprMethodCall"
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}

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

pub use syn::*;

use syn::{parse_str, Expr, ExprField, ExprMethodCall, GenericArgument, Lit, Type};

fn main() {
    // 1. syn::parse_str parses a basic method call into syn::ExprMethodCall with receiver and method ident
    let expr: Expr = parse_str("receiver.do_something()").expect("failed to parse basic method call");
    match expr {
        Expr::MethodCall(call) => {
            assert_eq!(call.method.to_string(), "do_something");
            match *call.receiver {
                Expr::Path(ref p) => assert_eq!(p.path.segments[0].ident.to_string(), "receiver"),
                _ => panic!("expected Expr::Path for receiver"),
            }
            assert!(call.turbofish.is_none());
            assert!(call.args.is_empty());
        }
        _ => panic!("expected Expr::MethodCall"),
    }

    // 2. syn::parse_str parses a method call with turbofish generic arguments into syn::ExprMethodCall with AngleBracketedGenericArguments
    let expr: Expr = parse_str("iter.collect::<Vec<i32>>()").expect("failed to parse turbofish method call");
    match expr {
        Expr::MethodCall(call) => {
            assert_eq!(call.method.to_string(), "collect");
            let turbofish = call.turbofish.expect("expected turbofish generic arguments");
            assert_eq!(turbofish.args.len(), 1);
            match turbofish.args.first().unwrap() {
                GenericArgument::Type(Type::Path(type_path)) => {
                    assert_eq!(type_path.path.segments[0].ident.to_string(), "Vec");
                }
                _ => panic!("expected Type::Path for generic argument"),
            }
        }
        _ => panic!("expected Expr::MethodCall"),
    }

    // 3. syn::parse_str parses chained method calls into nested syn::ExprMethodCall receivers
    let expr: Expr = parse_str("builder.step_one().step_two()").expect("failed to parse chained method calls");
    match expr {
        Expr::MethodCall(outer) => {
            assert_eq!(outer.method.to_string(), "step_two");
            match *outer.receiver {
                Expr::MethodCall(inner) => {
                    assert_eq!(inner.method.to_string(), "step_one");
                    match *inner.receiver {
                        Expr::Path(p) => assert_eq!(p.path.segments[0].ident.to_string(), "builder"),
                        _ => panic!("expected Expr::Path for base receiver"),
                    }
                }
                _ => panic!("expected Expr::MethodCall for outer receiver"),
            }
        }
        _ => panic!("expected Expr::MethodCall"),
    }

    // 4. syn::parse_str parses method calls with multiple arguments preserving argument order
    let expr: Expr = parse_str("map.insert(\"key\", 42)").expect("failed to parse method call with arguments");
    match expr {
        Expr::MethodCall(call) => {
            assert_eq!(call.method.to_string(), "insert");
            assert_eq!(call.args.len(), 2);
            match (&call.args[0], &call.args[1]) {
                (Expr::Lit(lit0), Expr::Lit(lit1)) => {
                    match (&lit0.lit, &lit1.lit) {
                        (Lit::Str(s), Lit::Int(i)) => {
                            assert_eq!(s.value(), "key");
                            assert_eq!(i.base10_parse::<i32>().unwrap(), 42);
                        }
                        _ => panic!("expected Lit::Str and Lit::Int arguments"),
                    }
                }
                _ => panic!("expected Expr::Lit arguments"),
            }
        }
        _ => panic!("expected Expr::MethodCall"),
    }

    // 5. syn::parse_str parses method calls with outer attributes into syn::ExprMethodCall with attrs
    let expr: Expr = parse_str("#[inline] target.run()").expect("failed to parse method call with attribute");
    match expr {
        Expr::MethodCall(call) => {
            assert_eq!(call.attrs.len(), 1);
            assert_eq!(call.method.to_string(), "run");
        }
        _ => panic!("expected Expr::MethodCall"),
    }

    // 6. syn::parse_str distinguishes method calls from field access returning Expr::MethodCall vs Expr::Field
    let field_expr: Expr = parse_str("obj.field").expect("failed to parse field access");
    assert!(matches!(field_expr, Expr::Field(ExprField { .. })));
    let method_expr: Expr = parse_str("obj.method()").expect("failed to parse method call");
    assert!(matches!(method_expr, Expr::MethodCall(ExprMethodCall { .. })));

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