private static boolean areNullabilityCompatible(final PsiMethod oldTargetMethod,
                                                  final PsiMethod newTargetMethod) {
    // the cast may be for the @NotNull which newTargetMethod has whereas the oldTargetMethod doesn't
    Nullability oldNullability = NullableNotNullManager.getNullability(oldTargetMethod);
    Nullability newNullability = NullableNotNullManager.getNullability(newTargetMethod);
    return oldNullability == newNullability;
  }
private static boolean areNullabilityCompatible(final PsiMethod oldTargetMethod,
                                                  final PsiMethod newTargetMethod)