Expression.OptionalMemberSourceval pp :
(Ppx_deriving_runtime.Format.formatter -> 'M -> Ppx_deriving_runtime.unit) ->
(Ppx_deriving_runtime.Format.formatter -> 'T -> Ppx_deriving_runtime.unit) ->
Ppx_deriving_runtime.Format.formatter ->
('M, 'T) t ->
Ppx_deriving_runtime.unitval show :
(Ppx_deriving_runtime.Format.formatter -> 'M -> Ppx_deriving_runtime.unit) ->
(Ppx_deriving_runtime.Format.formatter -> 'T -> Ppx_deriving_runtime.unit) ->
('M, 'T) t ->
Ppx_deriving_runtime.string