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: mod.rs
    path of file: ./repos/zmq.rs/src/endpoint
    
    the code of the file until where you have to start completion: mod error;
mod host;
mod transport;

use once_cell::sync::Lazy;
use regex::Regex;

use std::fmt;
use std::net::SocketAddr;
use std::path::PathBuf;
use std::str::FromStr;

pub use error::EndpointError;
pub use host::Host;
pub use transport::Transport;

pub type Port = u16;

static TRANSPORT_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^([[:lower:]]+)://(.+)$").unwrap());
static HOST_PORT_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^(.+):(\d+)$").unwrap());

/// Represents a ZMQ Endpoint.
///
/// # Examples
/// ```
/// # use zeromq::{Endpoint, Host};
/// # fn main() -> Result<(), zeromq::ZmqError> {
/// assert_eq!(
///     "tcp://example.com:4567".parse::<Endpoint>()?,
///     Endpoint::Tcp(Host::Domain("example.com".to_string()), 4567)
/// );
/// # Ok(()) }
/// ```
#[non_exhaustive]
#[derive(Debug, Clone, PartialEq, Hash, Eq)]
pub enum Endpoint {
    // TODO: Add endpoints for the other transport variants
    Tcp(Host, Port),
    Ipc(Option<PathBuf>),
}

impl Endpoint {
    pub fn transport(&self) -> Transport {
        match self {
            Self::Tcp(_, _) => Transport::Tcp,
            Self::Ipc(_) => Transport::Ipc,
        }
    }

    /// Creates an
    
    fn test_endpoint_parse() {
        use std::mem::discriminant as disc;

        // Test example 1:1 pairs
        for (e, s) in PAIRS.iter() {
            assert_eq!(&s.parse::<Endpoint>().unwrap(), e);
        }

        let exact_counter_examples = vec![(
            "abc://127.0.0.1:1234",
            EndpointError::UnknownTransport("abc".to_string()),
        )];

        for (s, target_err) in exact_counter_examples {
            let parse_err = s.parse::<Endpoint>().unwrap_err();
            assert_eq!(parse_err.to_string(), target_err.to_string());
            assert_eq!(disc(&parse_err), disc(&target_err));
        }

        // Examples where we only care about matching variants, rather than contents of
        // those variants
        let inexact_counter_examples = vec![
            ("://127.0.0.1:1234", EndpointError::Syntax("")),
            ("tcp://127.0.0.1:", EndpointError::Syntax("")),
            ("tcp://:1234", EndpointError::Syntax("")),
            ("tcp://127.0.0.1", EndpointError::Syntax("")),
            ("tcp://127.0.0.1:65536", EndpointError::Syntax("")),
            ("TCP://127.0.0.1:1234", EndpointError::Syntax("")),
        ];

        for (s, target_variant) in inexact_counter_examples {
            let parse_err = s.parse::<Endpoint>().unwrap_err();
            assert_eq!(disc(&parse_err), disc(&target_variant));
        }
    }