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

[Per Nordlöw]

On Wednesday, 9 May 2018 at 14:20:41 UTC, Per Nordlöw wrote:
> If so, we can temporarily modify the trait to exclude the last 
> `void*` member of the `S.tuple`. Given that it's always added 
> as the last member.

Also note that

     pragma(msg, __traits(isDisabled, S.this(this)));

fails to compile as

     Error: identifier expected following `.`, not `this`