Can we enable -preview=rvaluereference now?

[IchorDev]

On Tuesday, 13 August 2024 at 10:43:18 UTC, Nicholas Wilson wrote:
> On Tuesday, 13 August 2024 at 09:11:22 UTC, Nicholas Wilson 
> wrote:
>> On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
>>> So this preview has been available for more than 5 years.
>>> Can we un-preview this now?
>>
>> https://github.com/dlang/dmd/pull/16778
>
> at the moment, no because it doesn't pass CI. Templates with 
> `ref T` with `T==void` (misrecognised untyped lambdas e.g. `str 
> => dst.put(str)` which should be a delegate) give e.g.:
>     std/bigint.d(1280): Error: cannot have parameter of type 
> `void`

That’s feels like the silliest reason to not un-preview 
something, and I bet if we just did it anyway then someone would 
actually fix that.