File "src/A/B.ml", line 1:
Error: The implementation src/A/B.ml
       does not match the interface src/A/.A.objs/byte/B.cmi:
        ... ... ... ... ...
       The second module type is not included in the first ...
       The value `to_hex' is required but not provided
       File "src/C/s.ml", line 66, characters 2-25:
         Expected declaration
       The value `of_hex' is required but not provided
       File "src/C/s.ml", line 68, characters 2-34:
         Expected declaration
       The value `of_hex_opt' is required but not provided
       File "src/C/s.ml", line 70, characters 2-36:
         Expected declaration
       At position
         module Make :
           sig module S : sig module type DATA = <here> end end
       The value `of_bytes' is required but not provided
       File "src/C/s.ml", line 84, characters 2-38:
         Expected declaration