Function beagle::scalar_array::vec_array::fold2

pub fn fold2<S, R, T, F0, F, O>(
    s: <R as Array<S>>::Type, 
    t: <R as Array<T>>::Type, 
    f0: F0, 
    f: F
) -> O where
    R: Dim<S> + Dim<T>,
    F0: FnOnce(S, T) -> O,
    F: FnMut(O, S, T) -> O,
    R::Smaller: Array<S> + Array<T>, 

Fold all the elements of two 1d arrays. The first elements are mapped with f0, then folding continues with f for other elements.