rust do while loop

do-while-loop.rs

macro_rules! do_loop {(
    $body:block while $cond:expr
) => ({
    let mut first = true;
    while ::core::mem::replace(&mut first, false) || $cond
        $body
})}

let mut x = 6;
do_loop!({
    if x == 6 {
        x = 0;
        continue;
    }
    x += 1;
    println!("{}", x);
} while x < 6);