Something's wrong

gistfile1.rs

use std::net;

fn main() {
//    let hostname = &"example.com";
//    let lookup = std::net::lookup_host(hostname);
//    for address in lookup{
//      println!("Found this:{}", address);
//    }

    for host in try!(net::lookup_host("rust-lang.org")) {
            println!("found address: {}", try!(host));
    }
}

Compiler's reaction to the official example code:
<std macros>:5:8: 6:42 error: mismatched types:
 expected `()`,
    found `core::result::Result<_, _>`
(expected (),
    found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
<std macros>:1:1: 6:48 note: in expansion of try!
src/main.rs:17:17: 17:56 note: expansion site
<std macros>:5:8: 6:42 error: mismatched types:
 expected `()`,
    found `core::result::Result<_, _>`
(expected (),
    found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
<std macros>:1:1: 6:48 note: in expansion of try!
src/main.rs:18:43: 18:53 note: expansion site
note: in expansion of format_args!
<std macros>:2:25: 2:56 note: expansion site
<std macros>:1:1: 2:62 note: in expansion of print!
<std macros>:3:1: 3:54 note: expansion site
<std macros>:1:1: 3:58 note: in expansion of println!
src/main.rs:18:13: 18:55 note: expansion site
error: aborting due to 2 previous errors
Could not compile `rust_network`.



An to the commented code:
src/main.rs:14:33: 14:40 error: the trait `core::fmt::Display` is not implemented for the type `std::net::LookupHost` [E0277]
src/main.rs:14       println!("Found this:{}", address);