fn base_digits<I: Iterator<Item=usize>>(val: usize, mut base: I) -> Vec<usize> {
  let mut digits = Vec::new();
  let mut val = val;
  while val > 0 {
    let base_i = base.next().unwrap();
    digits.push(val % base_i);
    val /= base_i;
  }
  digits
}

fn main() {
    let a = 0b1001100;
    println!("{:?}", base_digits(a, std::iter::repeat(2)));

    let a = 463;
    println!("{:?}", base_digits(a, (1..)));
}