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

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On Wednesday, 9 May 2018 at 14:07:37 UTC, Per Nordlöw wrote:
> Why (on earth) does
>
>     struct S
>     {
>         @disable this(this);
>         int* _ptr;
>     }
>     pragma(msg, typeof(S.tupleof));
>
> prints
>
> (int*, void*)
>
> when
>
>     struct S
>     {
>         int* _ptr;
>     }
>     pragma(msg, typeof(S.tupleof));
>
> prints
>
> (int*)
>
> ?!!!

I wasn't able to reproduce it on dmd-nightly: 
https://run.dlang.io/is/9wT8tH

What version of the compiler are you using?