private static PsiElement getStubPsi(List<? extends StubbedSpine> spines, int index) {
    if (spines.size() == 1) return spines.get(0).getStubPsi(index);

    for (StubbedSpine spine : spines) {
      int count = spine.getStubCount();
      if (index < count) {
        return spine.getStubPsi(index);
      }
      index -= count;
    }
    return null;
  }
private static PsiElement getStubPsi(List<? extends StubbedSpine> spines, int index)