dune exec dice fails - Error: Unbound type constructor Yojson.json

[rishubn]

Cloning and building the latest commit results with this error:

dune exec dice       
File "bin/dice.ml", line 30, characters 17-28:
30 | let json_res r : Yojson.json =
                      ^^^^^^^^^^^
Error: Unbound type constructor Yojson.json