docs: func (s *S3AccessControlList) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "S3AccessControlList"}
  	if s.Owner == nil {
  		invalidParams.Add(request.NewErrParamRequired("Owner"))
  	}
  	if s.Grants != nil {
  		for i, v := range s.Grants {
  			if v == nil {
  				continue
  			}
  			if err := v.Validate(); err != nil {
  				invalidParams.AddNested(fmt.Sprintf("%s[%v]", "Grants", i), err.(request.ErrInvalidParams))
  			}
  		}
  	}
  	if s.Owner != nil {
  		if err := s.Owner.Validate(); err != nil {
  			invalidParams.AddNested("Owner", err.(request.ErrInvalidParams))
  		}
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }