Hof in Rust

hof-reordered.rs

fn double(a: int) -> int { a * 2 }

fn ntimes(f: proc(int) -> int, times: int) -> proc(int) -> int {
    proc(x: int) { 
       match times {
         0 => { x },
         _ => { f(ntimes(f, times - 1)(x)) }   // swap the order relative to the original example
       }
    }
}

fn main() {
    let quadruple = ntimes(double, 3);
    println!("quad: {:d}", quadruple(3));
}