Function gluon_base::merge::merge_tuple_iter

pub fn merge_tuple_iter<'a, I, F, T, R>(types: I, f: F) -> Option<R> where
    I: IntoIterator<Item = (&'a T, &'a T)>,
    I::IntoIter: FusedIterator + Clone,
    F: FnMut(&'a T, &'a T) -> Option<T>,
    T: Clone + 'a,
    R: FromIterator<T>,