bind
fun <I : Any, O, R, U : Any> Parser<I, O, U>.bind(transform: (O) -> Parser<I, R, U>): Parser<I, R, U>
Flat-maps the success value of this parser to a second parser, then runs it.
Sugar for pBind: a.bind { … } is equivalent to pBind(a) { … }.
Prefer trailing-lambda call style over infix to avoid visual ambiguity.