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: psql_as_mysql.rs
    path of file: ./repos/tensorbase/crates/server_mysql/examples
    
    the code of the file until where you have to start completion: //! This example implements a (simple) proxy that allows connecting to PostgreSQL as though it were
//! a MySQL database. To try this out, start a PostgreSQL database at localhost:5432, and then run
//! this example. Notice that `main` does *not* use PostgreSQL bindings, just MySQL ones!

extern crate mysql;
extern crate postgres;
extern crate server_mysql;
extern crate slab;

use mysql::prelude::*;
use server_mysql::*;
use slab::Slab;

use std::io;
use std::net;
use std::thread;

fn main() {
    let listener = net::TcpListener::bind("127.0.0.1:0").unwrap();
    let port = listener.local_addr().unwrap().port();

    let jh = thread::spawn(move || {
        if let Ok((s, _)) = listener.accept() {
            let client = postgres::Client::connect(
                "postgresql://postgres:123456@localhost:5432",
                postgres::NoTls,
            )
            .unwrap();
         
    
fn main() {
    let listener = net::TcpListener::bind("127.0.0.1:0").unwrap();
    let port = listener.local_addr().unwrap().port();

    let jh = thread::spawn(move || {
        if let Ok((s, _)) = listener.accept() {
            let client = postgres::Client::connect(
                "postgresql://postgres:123456@localhost:5432",
                postgres::NoTls,
            )
            .unwrap();
            MysqlIntermediary::run_on_tcp(Postgres::new(client), s).unwrap();
        }
    });

    // we connect using MySQL bindings, but no MySQL server is running!
    let mut db =
        mysql::Conn::new(&format!("mysql://root:123456@127.0.0.1:{}", port)).unwrap();
    assert_eq!(db.ping(), true);
    {
        let mut results = db
            .query_iter("SELECT INT4(1) AS foo, INT8(1) AS bar, 'BAZ' AS baz")
            .unwrap();
        {
            let cols = results.columns();
            let cols = cols.as_ref();
            assert_eq!(cols.len(), 3);
            assert_eq!(cols[0].name_str(), "foo");
            assert_eq!(cols[1].name_str(), "bar");
            assert_eq!(cols[2].name_str(), "baz");
        }
        let one = results.next();
        assert!(one.is_some());
        if let Some(row) = one {
            let row = row.unwrap();
            assert_eq!(row.len(), 3);
            let one = row.get::<i32, _>(0).unwrap();
            assert_eq!(one, 1);
            let one = row.get::<i64, _>(1).unwrap();
            assert_eq!(one, 1);
            let s = row.get::<Vec<u8>, _>(2).unwrap();
            assert_eq!(s, b"BAZ");
        }
        assert_eq!(results.count(), 0);
    }
    {
        let mut results = db
            .exec_iter("SELECT INT4(1) AS foo, INT8(1) AS bar, 'BAZ' AS baz", ())
            .unwrap();
        {
            let cols = results.columns();
            let cols = cols.as_ref();
            assert_eq!(cols.len(), 3);
            assert_eq!(cols[0].name_str(), "foo");
            assert_eq!(cols[1].name_str(), "bar");
            assert_eq!(cols[2].name_str(), "baz");
        }
        let one = results.next();
        assert!(one.is_some());
        if let Some(row) = one {
            let row = row.unwrap();
            assert_eq!(row.len(), 3);
            let one = row.get::<i32, _>(0).unwrap();
            assert_eq!(one, 1);
            let one = row.get::<i64, _>(1).unwrap();
            assert_eq!(one, 1);
            let s = row.get::<Vec<u8>, _>(2).unwrap();
            assert_eq!(s, b"BAZ");
        }
        assert_eq!(results.count(), 0);
    }
    drop(db);
    jh.join().unwrap();
}