Validation <Error, CreateRoleCommand> ValidateCreateRoleMsg(CreateRoleCommand msg)
 => from x in ValidateNonNull(msg)
 from y in (
 public Try <Validation <Error, RoleDto> > Execute(CreateRoleCommand msg)
 => ()
 => from x in ValidateCreateRoleMsg(msg)
 let y = _rRepository.Create(x.ToRole())
         select y.ToRoleDTO();