@NotNull
  private static Collection<PsiElement> suggestCandidates(@Nullable PsiReference reference) {
    if (reference == null) {
      return Collections.emptyList();
    }
    return TargetElementUtil.getInstance().getTargetCandidates(reference);
  }
@NotNull
  private static Collection<PsiElement> suggestCandidates(@Nullable PsiReference reference)