code: func (f *File) Normalize() error {
  	for tempName, t := range f.Template {
  		if err := t.Normalize(); err != nil {
  			return fmt.Errorf("template %q: %s", tempName, err)
  		}
  	}
  	return nil
  }
docs: // Normalize will normalize all of the Templates in this message, returning an
  // error if any are invalid.