12345678910111213openPpxliblet()=letname="decoders"inletstr_type_decl=Deriving.Generator.make_noargDecoders_deriver.str_gensin(* let sig_type_decl = Deriving.Generator.make_noarg sig_gen in *)Deriving.addname~str_type_decl(* ~sig_type_decl *)|>Deriving.ignorelet()=letname="encoders"inletstr_type_decl=Deriving.Generator.make_noargEncoders_deriver.str_gensin(* let sig_type_decl = Deriving.Generator.make_noarg sig_gen in *)Deriving.addname~str_type_decl(* ~sig_type_decl *)|>Deriving.ignore