Function transducers::reduce_iter

pub fn reduce_iter<'t, R, T, U, I: Iterator<Item = U>, Fold: Fn(R, T) -> R + 't, Trans: Transducer<'t, R, T, U>>(
    iter: I, 
    seed: R, 
    fold: Fold, 
    trans: Trans
) -> R where
    Trans::Step: 't, 

Applies the fold reduction operation on iter transformed by trans.