docs: public ValidationMatcher getValidationMatcher(String validationMatcherName) throws NoSuchValidationMatcherException {
          if (!members.containsKey(validationMatcherName)) {
              throw new NoSuchValidationMatcherException("Can not find validation matcher " + validationMatcherName + " in library " + name + " (" + prefix + ")");
          }
  
          return members.get(validationMatcherName);
      }