dip1000 + pure is a DEADLY COMBO

[Paul Backus]

On Wednesday, 12 May 2021 at 22:51:24 UTC, MoonlightSentinel 
wrote:
> On Wednesday, 12 May 2021 at 22:11:36 UTC, Paul Backus wrote:
>> Short answer: yes, but it requires a lot of difficult and 
>> tedious debugging work, and nobody has volunteered yet.
>
> ... and will probably break code in several other libraries.

If they're using -preview=dip1000, yes. Do preview flags come 
with a stability guarantee?