You can search for identifiers within the package.
in-package search v0.2.0
type token =
| SEMICOLON
| PERCENT
| OPEN
| LT
| INT of int
| GT
| EQ
| EOF
| DIRECTIVE of char
| DASH
| CLOSE
| CHAR of char
exception Error
val main : (Lexing.lexbuf -> token) -> Lexing.lexbuf -> Duration_private.O.t -> Duration_private.O.t -> string