You can search for identifiers within the package.
in-package search v0.2.0
val from_gen : char Gen.t -> lexbuf
val from_stream : char Stream.t -> lexbuf
val from_channel : in_channel -> lexbuf
val from_string : string -> lexbuf
val lexeme : lexbuf -> string
val sub_lexeme : lexbuf -> int -> int -> string