You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/wayland-rs/wayland-scanner/src
    
    the code of the file until where you have to start completion: //! Wayland protocol code-generation machinnery
//!
//! This crate provides procedural macros for generating the rust code associated with a
//! Wayland XML protocol specification, for use with the `wayland-client`, `wayland-server`
//! and `wayland-backend` crates.
//!
//! Before trying to use this crate, you may check if the
    
pub fn generate_interfaces(stream: proc_macro::TokenStream) -> proc_macro::TokenStream {
    let path: OsString = token::parse_lit_str_token(stream).into();
    let path = if let Some(manifest_dir) = std::env::var_os("CARGO_MANIFEST_DIR") {
        let mut buf = PathBuf::from(manifest_dir);
        buf.push(path);
        buf
    } else {
        path.into()
    };
    let file = match std::fs::File::open(&path) {
        Ok(file) => file,
        Err(e) => panic!("Failed to open protocol file {}: {}", path.display(), e),
    };
    let protocol = parse::parse(file);
    interfaces::generate(&protocol, true).into()
}