protected @Nullable List<? extends PsiElement> getCommentsFor(@NotNull PsiElement container) {
    PsiElement prev = PsiTreeUtil.skipWhitespacesBackward(container);
    if (prev == null) {
      return null;
    }
    return Collections.singletonList(prev);
  }
protected @Nullable List<? extends PsiElement> getCommentsFor(@NotNull PsiElement container)