docs: public static <T, U> Collection<T> findResults(Iterator<U> self, @ClosureParams(FirstParam.FirstGenericType.class) Closure<T> filteringTransform) {
          List<T> result = new ArrayList<T>();
          while (self.hasNext()) {
              U value = self.next();
              T transformed = filteringTransform.call(value);
              if (transformed != null) {
                  result.add(transformed);
              }
          }
          return result;
      }