Function combine::parser::combinator::and_then

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

Equivalent to p.and_then(f).