You can search for identifiers within the package.
in-package search v0.2.0
module I : INPUT
include INPUT with type ic = I.ic
type ic = I.ic
val read : ic -> int -> string Lwt.t
val read_line : ic -> string Lwt.t
val read_char : ic -> char Lwt.t
val read_lexeme : ic -> (lexeme, error) Stdlib.result Lwt.t
val decode : ic -> lexeme -> t Lwt.t