val pp_question_mark :
Ppx_deriving_runtime.Format.formatter ->
question_mark ->
Ppx_deriving_runtime.unit
val show_question_mark : question_mark -> Ppx_deriving_runtime.string
val yojson_of_question_mark :
question_mark ->
Ppx_yojson_conv_lib.Yojson.Safe.t
val question_mark_of_yojson :
Ppx_yojson_conv_lib.Yojson.Safe.t ->
question_mark
val hash_fold_question_mark :
Ppx_hash_lib.Std.Hash.state ->
question_mark ->
Ppx_hash_lib.Std.Hash.state
val hash_question_mark : question_mark -> Ppx_hash_lib.Std.Hash.hash_value