No ty_of_yojson_exn defined?

[mars0i]

The README says that three functions are defined, including ty_of_yojson_exn. I am only getting the other two functions:

~$ opam list | grep yojson
ppx_deriving_yojson     3.1         JSON codec generator for OCaml >=4.02
yojson                  1.4.1       Yojson is an optimized parsing and printing library for the JSON format
~$ utop
...
# #require "ppx_deriving_yojson";;
# type foo = {a : int} [@@deriving yojson];;
type foo = { a : int; }
val foo_to_yojson : foo -> Yojson.Safe.json = <fun>
val foo_of_yojson : Yojson.Safe.json -> foo Ppx_deriving_yojson_runtime.error_or = <fun>

Is the README out of date, or is something going wrong?

[whitequark]

This isn't present in a released version (and is blocked by #76).

[mars0i]

Ah, OK. So the README is currently wrong for the latest opam release but this is a temporary issue that may be resolved in the code rather than in the README. Thanks.