#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn simple_fold<A, T>(
    iter: impl Iterator<Item = T>,
    mut accum: A,
    mut f: impl FnMut(A, T) -> A,
) -> A {
    for x in iter {
        accum = f(accum, x);
    }
    accum
}
fn main() {}