Macro me3_framework::function

macro_rules! function {
    (
        $(
            $vs:vis $name:ident: $(extern $($cc:literal)?)? fn($($arg_id:ident: $arg_ty:ty),*) $(-> $ret_ty:ty)? = $lib_name:tt$sep:tt$var:tt$([$add:tt])?;
        )*
    ) => { ... };
}