Option.Monad_infix
val (>>=) : 'a option -> ('a -> 'b option) -> 'b option
t >>= f returns a computation that sequences the computations represented by two monad elements. The resulting computation first does t to yield a value v, and then runs the computation returned by f v.
t >>= f
t
v
f v
val (>>|) : 'a option -> ('a -> 'b) -> 'b option
t >>| f is t >>= (fun a -> return (f a)).
t >>| f
t >>= (fun a -> return (f a))