Can't access primitives in v0.16.0

[yongrenjie]

Since upgrading to v0.16.0 (released yesterday on OPAM), primitives such as int_of_yojson aren't visible. (Downgrading to v0.15.1 works!)

Minimal working example:

type t = {
  id: int;
}
[@@deriving of_yojson]

let () =
  let json = "{\"id\": 1}" in
  let t = t_of_yojson (Yojson.Safe.from_string json) in
  Printf.printf "id is: %d\n" t.id

Error:

File "bin/main.ml", line 2, characters 6-9:
2 |   id: int;
          ^^^
Error: Unbound value int_of_yojson

[W95Psp]

I have the same issue, but looking at commit 6a0456d, this breaking change seems intentional. The solution is thus to add an explicit open Ppx_yojson_conv_lib.Yojson_conv.Primitives. I guess this change was made because a PPX cannot distinguish between i.e. a user-defined option and OCaml's option...

[Lupus]

Can this be added into README? I have to lookup this library name in other projects where I have figured it out already. Would be awesome to have minimal set of steps to get one going with this ppx right in README...