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/rustler/rustler_codegen/src
    
    the code of the file until where you have to start completion: #![recursion_limit = "128"]

use proc_macro::TokenStream;

mod context;
mod encode_decode_templates;
mod ex_struct;
mod init;
mod map;
mod nif;
mod record;
mod tagged_enum;
mod tuple;
mod unit_enum;
mod untagged_enum;

#[derive(Debug)]
enu
    
pub fn nif(args: TokenStream, input: TokenStream) -> TokenStream {
    let mut nif_attributes = nif::NifAttributes::default();

    if !args.is_empty() {
        let nif_macro_parser = syn::meta::parser(|meta| nif_attributes.parse(meta));

        syn::parse_macro_input!(args with nif_macro_parser);
    }

    let input = syn::parse_macro_input!(input as syn::ItemFn);

    nif::transcoder_decorator(nif_attributes, input).into()
}