val string_of_op : op -> stringmodule type PROTOCOL_IMPLEMENTATION = sig ... endmodule Proto_32 : PROTOCOL_IMPLEMENTATIONmodule Proto_64 : PROTOCOL_IMPLEMENTATIONBlkproto.Reqval string_of_op : op -> stringmodule type PROTOCOL_IMPLEMENTATION = sig ... endmodule Proto_32 : PROTOCOL_IMPLEMENTATIONmodule Proto_64 : PROTOCOL_IMPLEMENTATION