D Editions

[Quirin Schroll]

On Thursday, 16 January 2025 at 17:01:40 UTC, Paul Backus wrote:
> On Thursday, 16 January 2025 at 01:08:17 UTC, Quirin Schroll 
> wrote:
>> This. There is something implicitly said in your post, though: 
>> Medium-scale breaking changes with non-trivial migration 
>> paths. For those, editions shine. A simple example might be 
>> the introduction of a new keyword.
>
> "Medium" is what "large" calls itself when it doesn't want to 
> admit it's gained weight. If it's disruptive enough to require 
> an edition bump, it's "large."
>
> For something like a new keyword, whether it's feasible or not 
> depends *entirely* on what the keyword is. For example, we just 
> added [`__rvalue`][1] without an edition bump or even a preview 
> switch, and nobody expects it to cause any problems. OTOH, if 
> you wanted to add a `match` keyword, I do not think you could 
> do it even with an edition bump.
>
> [1]: https://github.com/dlang/dmd/pull/17050

Well, `__rvalue` essentially was a keyword as all `__stuff` are 
reserved.
Why we couldn’t add `match` as a keyword in an edition is beyond 
me.
You can always rename your variables in old code when you decide 
you’re ready for the next edition.