You can search for identifiers within the package.
in-package search v0.2.0
type t = Unix.file_kind =
| S_REG
| S_DIR
| S_CHR
| S_BLK
| S_LNK
| S_FIFO
| S_SOCK
val sexp_of_t : t -> Ppx_sexp_conv_lib.Sexp.t