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then

jaq_core::box_iter

Function then 

Source 
pub fn then<'a, T, U: 'a, E: 'a>(
    x: Result<T, E>,
    f: impl FnOnce(T) -> Results<'a, U, E>,
) -> Results<'a, U, E>
Expand description

If x is an Err, return it as iterator, else apply f to x and return its output.