public @Nullable PsiAnnotation copyNullableAnnotation(@NotNull PsiModifierListOwner original, @NotNull PsiModifierListOwner generated) {
    NullabilityAnnotationInfo info = findOwnNullabilityInfo(original);
    if (info == null || info.getNullability() != Nullability.NULLABLE) return null;
    return copyAnnotation(info.getAnnotation(), generated);
  }
public @Nullable PsiAnnotation copyNullableAnnotation(@NotNull PsiModifierListOwner original, @NotNull PsiModifierListOwner generated)