tuple not part of core language

[Nick Treleaven]

On Tuesday, 20 January 2026 at 19:51:33 UTC, Timon Gehr wrote:
> Whether there is a druntime component is an implementation 
> detail (and a lot of existing features require druntime 
> support). However, semantically, I don't think it makes that 
> much sense to add tuples to D that don't behave like `struct`s 
> (except maybe there can be some magic for things like reverse 
> type deduction through tuple literals).

Yes, and compatibility with `std.typecons.Tuple` would be useful. 
Though it would be nice if slicing produced a tuple rather than a 
sequence.

> Anyway, the unpacking DIP did get accepted recently (and 
> pragmatically, unpacking is really the main thing that is 
> missing in D), so we should try to get the implementation ready 
> to merge. (IIRC there is still a known issue involving an ICE 
> on unpack if a tuple component type has both move and copy 
> constructors.)

I suggest submitting a PR to merge your unpacking branch if you 
have time. It's already behind a preview flag, so it doesn't have 
to be perfect. It's easier to test, file bugs and get people to 
see and fix them when it's in the main repo.