You can search for identifiers within the package.
in-package search v0.2.0
module Infix : sig ... end
val errorf : ('a, unit, string, ('b, [> `Msg of string ]) Stdlib.result) Stdlib.format4 -> 'a
val to_error_list : ('a, 'err) Stdlib.result -> ('a, 'err list) Stdlib.result
module List : sig ... end