You can search for identifiers within the package.
in-package search v0.2.0
val return : 'a -> ('a, 'i, 'i) t
val bind : ('a, 'i, 'j) t -> f:('a -> ('b, 'j, 'k) t) -> ('b, 'i, 'k) t
val map : ('a, 'i, 'j) t -> f:('a -> 'b) -> ('b, 'i, 'j) t
val both : ('a, 'i, 'j) t -> ('b, 'j, 'k) t -> ('a * 'b, 'i, 'k) t
module Open_on_rhs : sig ... end