code: func (sb *SchemeBuilder) AddToScheme(s *Scheme) error {
  	for _, f := range *sb {
  		if err := f(s); err != nil {
  			return err
  		}
  	}
  	return nil
  }
docs: // AddToScheme applies all the stored functions to the scheme. A non-nil error
  // indicates that one function failed and the attempt was abandoned.