@NotNull
  protected static <T extends PyElement> Collection<T> fetchElements(@NotNull final Collection<? extends PyMemberInfo<T>> memberInfos) {
    return memberInfos.stream().map(o -> o.getMember()).filter(o -> o != null).collect(Collectors.toList());
  }
@NotNull
  protected static <T extends PyElement> Collection<T> fetchElements(@NotNull final Collection<? extends PyMemberInfo<T>> memberInfos)