LLM's think we should have language tuples!

[Nick Treleaven]

On Tuesday, 1 April 2025 at 19:26:53 UTC, Timon Gehr wrote:
>  It is more or less ready (and OpenD already pulled the current 
> state), but there are various small things to finish.

Good to hear.

> E.g.:
>
> - expanding a zero-element tuple does not work properly yet (in 
> general, even unrelated to unpacking)
>   https://github.com/dlang/dmd/issues/20842
>   I though I would have time to maybe fix this, but got 
> sidetracked last time I attempted to see it through.
>
> - Unpacking does not yet support auto-expanding, for example:
>
>   (AliasSeq!(int. int) x, int y) = tuple(1, 2, 3);
>
>   does not work yet.

I built the branch and tried that sample and some variations, but 
they each get:
```
/home/nick/git/dmd/generated/linux/release/64/../../../../../phobos/std/json.d(144): Error: no property `Entry` for type `object.TypeInfo_AssociativeArray`
                 JSONValue[string] unordered;
                                   ^
/home/nick/git/dmd/generated/linux/release/64/../../../../druntime/import/object.d(1289):        class `TypeInfo_AssociativeArray` defined here
class TypeInfo_AssociativeArray : TypeInfo
^
```
And:
```
core.exception.AssertError at src/dmd/typinf.d(112): Assertion 
failure
```
I'm not sure if it's something to do with my setup or not. My 
Phobos is  recent git, probably that's why.

> - I need to write an extensive test suite and address anything 
> it may catch.
>
> - I have to write the DIP and suffer through the bikeshedding 
> on the forum.
>
> Of course, one way to continue would be to just write tests for 
> what works and pull this (e.g., behind a -preview switch) and 
> to allow anyone who can spend the time required to take over 
> the polishing effort.

A `-preview` switch would be great. Then with the tests devs will 
at least keep it up-to-date with master. I think people would be 
more likely to work on it too, or at least file bugs.

> In general, I still fully intend to finish this, but I don't 
> know when I will manage to get it over the finish line at the 
> level of quality I think is perfect. It has already taken way 
> too long, mostly because I have not been able to focus on this 
> for any significant amount of time beside my day job and 
> various other obligations.

Thanks for your work on this!