private boolean isNullable(@Nullable PsiModifierListOwner owner) {
    if (owner == null) return false;
    if (NullableNotNullManager.isNullable(owner)) {
      return true;
    }
    final SmartPsiElementPointer<PsiModifierListOwner> pointer = myPointerManager.createSmartPsiElementPointer(owner);
    return myNullableSet.contains(pointer);
  }
private boolean isNullable(@Nullable PsiModifierListOwner owner)