Function std::result::fold

pub fn fold<T, V, E, F, Iter>(iterator: Iter, init: V, f: F) -> Result<V, E> where F: FnMut(V, T) -> V, Iter: Iterator<Item=Result<T, E>>

Unstable

Performs a fold operation over the result values from an iterator.

If an Err is encountered, it is immediately returned. Otherwise, the folded value is returned.