You can search for identifiers within the package.
in-package search v0.2.0
val error : Cstruct.t -> ('a, Format.formatter, unit, unit, unit, 'b) Pervasives.format6 -> 'a
val ck_redundant : Cstruct.t -> config -> int -> int -> unit
val big_tag : Cstruct.t -> int * int
val big_len : config -> Cstruct.t -> int -> int
val parse : config -> Cstruct.t -> Asn_core.Tag.t * int * coding