Function combine::combinator::and_then

pub fn and_then<P, F, O, E>(p: P, f: F) -> AndThen<P, F> where
    P: Parser,
    F: FnMut(P::Output) -> Result<O, E>,
    E: Into<Error<<P::Input as StreamOnce>::Item, <P::Input as StreamOnce>::Range>>, 

Equivalent to p.and_then(f).