I dun a DIP, possibly the best DIP ever

[Stefan Koch]

On Thursday, 23 April 2020 at 19:27:31 UTC, Steven Schveighoffer 
wrote:
> On 4/23/20 3:02 PM, Stefan Koch wrote:
>> On Thursday, 23 April 2020 at 18:57:04 UTC, Steven 
>> Schveighoffer wrote:
>>>[...]
>> 
>> It's the latter.
>> you cannot re-expand.
>
> Those 2 are contradictory statements.
>
> If it's the latter, then tuple1... is expanded to a tuple that 
> is then used in the outer expansion.
>
> -Steve

k tuples with n elements can only expand to 1 tuple with k*n 
elements.
They can't get more.