Preview features status?

[evilrat]

On Tuesday, 13 July 2021 at 15:51:26 UTC, Tejas wrote:
>
> Shouldn't this be a bug? Isn't this still ```const - 
> non-const```?
> Do you think this is worth filing?

Definitely a bug from usability point. But...

Well, seems like it is just yet another half baked feature 
according to this GH issue, also it seems like it was supposed to 
be superseded by relevant "in" qualifier for extern(C++) but that 
DIP seems to be abandoned as well.

https://github.com/dlang/dmd/pull/12064

> Also, where did you find out how to represent rvalue references 
> as parameters? I couldn't find any info on that. Just learned 
> that these are available under a preview switch.

Can't find it anywhere in release notes, it was just silently 
showed up around Apr 2019.