wasm-bindgen-macro-support 0.2.127

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# wasm-bindgen-macro-support 0.2.127 API Contracts

## What `search_known_solution` answered
`search_known_solution` returned an empty scaffold with unverified contract. This sample verifies the actual 0.2.127 expansion contracts.

## What a model would have written instead
A model may confuse `wasm-bindgen-macro-support` (the library crate) with `wasm-bindgen-macro` (the procedural macro attribute crate) or pass relative module paths to `expand_link_to` which fails with "relative module paths aren't supported yet".

## How the wrong version fails
Calling `expand_link_to` with relative paths results in a Diagnostic error. In addition, macro expansion requires syn 2.0 and proc-macro2 token streams rather than standard strings.

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 pkg:cargo/wasm-bindgen-macro-support@0.2.127
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/wasm-bindgen-macro-support@0.2.127

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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  "goal": "verify pkg:cargo/wasm-bindgen-macro-support@0.2.127",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/wasm-bindgen-macro-support@0.2.127"
  ]
}

//! Clean-room verification sample for wasm-bindgen-macro-support.

pub use wasm_bindgen_macro_support::*;

use quote::quote;
use wasm_bindgen_macro_support::{expand, expand_link_to};

fn main() {
    // 1. expand expands a public function into bindings tokens
    let fn_attr = quote!();
    let fn_item = quote!(
        pub fn add(a: u32, b: u32) -> u32 {
            a + b
        }
    );
    let fn_tokens = expand(fn_attr, fn_item).expect("expand function should succeed");
    let fn_str = fn_tokens.to_string();
    assert!(fn_str.contains("add"), "generated tokens should contain function name");

    // 2. expand expands a struct into BindgenedStruct derive tokens
    let struct_attr = quote!();
    let struct_item = quote!(
        pub struct User {
            pub id: u32,
        }
    );
    let struct_tokens = expand(struct_attr, struct_item).expect("expand struct should succeed");
    let struct_str = struct_tokens.to_string();
    assert!(struct_str.contains("BindgenedStruct"), "struct output should contain BindgenedStruct");

    // 3. expand expands an enum and preserves enum variants
    let enum_attr = quote!();
    let enum_item = quote!(
        pub enum Status {
            Active,
            Inactive,
        }
    );
    let enum_tokens = expand(enum_attr, enum_item).expect("expand enum should succeed");
    let enum_str = enum_tokens.to_string();
    assert!(enum_str.contains("Status"), "enum output should contain enum identifier");

    // 4. expand returns Err(Diagnostic) on invalid input syntax
    let invalid_attr = quote!();
    let invalid_item = quote!(
        not a valid rust item syntax !!!
    );
    let err_res = expand(invalid_attr, invalid_item);
    assert!(err_res.is_err(), "expand should fail on invalid syntax");

    // 5. expand_link_to generates link module bindings tokens for an absolute raw_module path
    let link_input = quote!(raw_module = "/bundle.js");
    let link_tokens = expand_link_to(link_input).expect("expand_link_to should succeed");
    let link_str = link_tokens.to_string();
    assert!(!link_str.is_empty(), "link_to tokens should not be empty");

    println!("All wasm-bindgen-macro-support contract assertions passed successfully.");
}