How do you test whether a variable is static or not?

[DigitalDesigns]

On Saturday, 16 June 2018 at 21:41:37 UTC, Jonathan M Davis wrote:
> On Saturday, June 16, 2018 14:55:51 Steven Schveighoffer via 
> Digitalmars-d- learn wrote:
>> On 7/30/16 8:47 AM, Jonathan M Davis via Digitalmars-d-learn 
>> wrote:
>> > I'm writing some serialization code where I need to skip 
>> > static variables. So, I have a symbol from a struct, and I'd 
>> > like to test whether it's static or not. Ideally, I'd be 
>> > able to do something like
>> >
>> > is(field == static)
>>
>> std.traits.hasStaticMember ?
>>
>> https://dlang.org/phobos/std_traits.html#hasStaticMember
>
> Yeah. I wrote that, and it got added to Phobos. If you'll note, 
> my post in this thread was from almost two years ago.
>
> - Jonathan M Davis

doesn't work:

..\..\src\phobos\std\traits.d(3823): Error: class `app.A` member 
`z` is not accessible.

What is the point of introspection if one can't get information 
about a type due to it's protection level?

For example, how is one suppose to serialize a class that has 
protected and private members, which are common, when using 
properties?