Extra .tupleof field in structs with disabled postblit blocks non-GC-allocation trait

[Meta]

On Wednesday, 9 May 2018 at 18:04:40 UTC, Per Nordlöw wrote:
> On Wednesday, 9 May 2018 at 17:52:48 UTC, Meta wrote:
>> I wasn't able to reproduce it on dmd-nightly: 
>> https://run.dlang.io/is/9wT8tH
>>
>> What version of the compiler are you using?
>
> Ahh, the struct needs to be in a unittest block for it to 
> happen:
>
> struct R
> {
>     @disable this(this);
>     int* _ptr;
> }
> unittest
> {
>     struct S
>     {
>         @disable this(this);
>         int* _ptr;
>     }
>     struct T
>     {
>         int* _ptr;
>     }
>     pragma(msg, "R: ", typeof(R.tupleof));
>     pragma(msg, "S: ", typeof(S.tupleof));
>     pragma(msg, "T: ", typeof(T.tupleof));
> }
>
> prints
>
> R: (int*)
> S: (int*, void*)
> T: (int*)
>
> Why is that?

It's a context pointer to the enclosing function/object/struct. 
Mark the struct as static to get rid of it.