You can search for identifiers within the package.
in-package search v0.2.0
minicaml
Minicaml.Lexer
val next_line : Lexing.lexbuf -> unit
val __ocaml_lex_tables : Lexing.lex_tables
val token : Lexing.lexbuf -> Parser.token
val __ocaml_lex_token_rec : Lexing.lexbuf -> int -> Parser.token