pub fn is_missing_authentication_token(&self) -> bool {
        matches!(
            &self.kind,
            PutRecommendationPreferencesErrorKind::MissingAuthenticationToken(_)
        )
    }
/// Returns `true` if the error kind is `PutRecommendationPreferencesErrorKind::MissingAuthenticationToken`.
Returns `true` if the error kind is `PutRecommendationPreferencesErrorKind::MissingAuthenticationToken`.
Returns ` true ` if the error kind is ` PutRecommendationPreferencesErrorKind :: MissingAuthenticationToken ` .
pub fn is_missing_authentication_token(&self) -> bool {
        matches!(
            &self.kind,
            PutRecommendationPreferencesErrorKind::MissingAuthenticationToken(_)
        )
    }
pub fn is_missing_authentication_token ( & self ) -> bool { matches ! ( self kind PutRecommendationPreferencesErrorKind MissingAuthenticationToken ( ) ) }
Returns `true` if the error kind is `PutRecommendationPreferencesErrorKind::MissingAuthenticationToken`.
Returns ` true ` if the error kind is ` PutRecommendationPreferencesErrorKind :: MissingAuthenticationToken ` .
&self
&self