rust learning puzzle #1

channeltype.rs

use std::thread;
use std::sync::mpsc::channel;

fn main() {
    let (tx, rx) = channel();

    // How to modify closure so only tx is captured? (without extra struct)
    thread::spawn(move |tx| {
        tx.send(String::from("hi")).unwrap();
    });
    
    println!("Got: {}", rx.recv().unwrap());
}

Capturing tx:

error[E0619]: the type of this value must be known in this context
 --> ticket.rs:9:9
  |
9 |         tx.send(String::from("hi")).unwrap();
  |         ^^

error: aborting due to previous error