Given this code:

abstract class A
{
    package @property void x(int x);
    package @property int x();
}

class B : A
{
    package @property override void x(int x) {}
    package @property override int x() { return 0; }
}

void main() {}

I get the following message:

onlineapp.d(9): Error: function `onlineapp.B.x` package method is not virtual and cannot override
onlineapp.d(10): Error: function `onlineapp.B.x` package method is not virtual and cannot override

Why is that? If the access specifier is private, I can perfectly understand it - subclasses can't call the private method of parent class, so there's no need in making it virtual. For protected/public the code compiles. However, for the package protection it may happen that a subclass is in the same package (and just happened to me).

Should I file a bug or is there a reason for such behavior?

On Thursday, May 10, 2018 11:52:38 Piotr Mitana via Digitalmars-d-learn wrote:
> Given this code:
>
> abstract class A
> {
>      package @property void x(int x);
>      package @property int x();
> }
>
> class B : A
> {
>      package @property override void x(int x) {}
>      package @property override int x() { return 0; }
> }
>
> void main() {}
>
> I get the following message:
>
> onlineapp.d(9): Error: function `onlineapp.B.x` package method is
> not virtual and cannot override
> onlineapp.d(10): Error: function `onlineapp.B.x` package method
> is not virtual and cannot override
>
> Why is that? If the access specifier is private, I can perfectly understand it - subclasses can't call the private method of parent class, so there's no need in making it virtual. For protected/public the code compiles. However, for the package protection it may happen that a subclass is in the same package (and just happened to me).
>
> Should I file a bug or is there a reason for such behavior?

I don't rememeber the reasoning at the moment, but it's most definitely not a bug and is on purpose. There's probably a "won't fix" bug in bugzilla for it if you go digging.

- Jonathan M Davis