fn start_one_thread(a : &mut [i32], children : &mut Vec<thread::JoinHandle<()>>)

{

    match a.split_first_mut()

    {

        Some(val) =>

        {

            let mut x = val.0;

            children.push(thread::spawn(move||

            {

                *x = 42;

            }));

            start_one_thread(val.1, children);

        }

        None => {}

    }

}

main.rs:7:10: 7:25 error: cannot infer an appropriate lifetime for autoref due to conflicting requirements [E0495]

main.rs:7   match a.split_first_mut()

                    ^~~~~~~~~~~~~~~

main.rs:7:8: 7:9 note: first, the lifetime cannot outlive the expression at 7:7...

main.rs:7   match a.split_first_mut()

                  ^

main.rs:7:8: 7:9 note: ...so that auto-reference is valid at the time of borrow

main.rs:7   match a.split_first_mut()

                  ^

main.rs:7:8: 7:27 note: but, the lifetime must be valid for the method call at 7:7...

main.rs:7   match a.split_first_mut()

                  ^~~~~~~~~~~~~~~~~~~

main.rs:7:8: 7:9 note: ...so that method receiver is valid for the method call

main.rs:7   match a.split_first_mut()