mismatched types when pattern matching connection result about rust-postgres HOT 5 CLOSED

match foo {
    Ok(e) => e,
    Err(e) => return Err(e),
}

extern crate postgres;

use self::postgres::{PostgresConnection, NoSsl};
use self::postgres::types::ToSql;

pub fn main() {
  println!("main");
  let conn = try!(PostgresConnection::connect("postgres://postgres:unreal122@localhost", &NoSsl));


  conn.execute("CREATE TABLE IF NOT EXISTS users (
                    id              SERIAL PRIMARY KEY,
                    name            VARCHAR NOT NULL,
                    time_created    TIMESTAMP NOT NULL,
                    data            BYTEA
                  )", []).unwrap();
}

Err(e) => return Err(e)

fn main() {
    match real_main() {
        Ok(_) => {}
        Err(e) => /* do something with the error */
    }
}

fn real_main() -> Result<(), Something> {}