pub fn register_rule(_: TokenStream, item: TokenStream) -> TokenStream {

    let func = parse_macro_input!(item as ItemFn);

    let rule_ident = &func.sig.ident;

    let static_name = format!("CONJURE_GEN_RULE_{}", rule_ident).to_uppercase();

    let static_ident = Ident::new(&static_name, rule_ident.span());

    let expanded = quote! {

        #func

        #[::conjure_rules::_dependencies::distributed_slice(::conjure_rules::RULES_DISTRIBUTED_SLICE)]

        pub static #static_ident: ::conjure_rules::_dependencies::Rule = ::conjure_rules::_dependencies::Rule {

            name: stringify!(#rule_ident),

            application: #rule_ident,

        };

    };

    TokenStream::from(expanded)

}