use quick_error::quick_error;use std::path::Path; quick_error! {    #[derive(Debug)]    pub enum Error {        Tbd {            display("tbd")        }    }} pub struct Transport {} impl crate::client::Transport for Transport {    fn set_service(&self) -> &[&str] {        unimplemented!("cached capabilities")    }     fn command_capabilities(&self, _command: &str, _out: &mut Vec<&str>) -> bool {        unimplemented!("command capabilities")    }} pub fn connect(    _host: &str,    _path: &Path,    _version: crate::Protocol,    _user: Option<&str>,    _port: Option<u16>,    _secure: bool,) -> Result<Transport, Error> {    unimplemented!("file connection")}