Editions Ideas

[Richard (Rikki) Andrew Cattermole]

On 17/12/2025 9:35 AM, Nick Treleaven wrote:
> On Monday, 15 December 2025 at 16:59:07 UTC, Lance Bachmeier wrote:
>> On Monday, 15 December 2025 at 12:26:04 UTC, Nick Treleaven wrote:
>>> For structs, I think there was some plan to replace it, but I never 
>>> saw details.
>>
>> Walter has indicated a desire to not use editions as an excuse to ruin 
>> the language.
>>
>> alias this with structs is very useful. There is no reason to remove 
>> it or make it unusable just because a few people think it can be 
>> dangerous. One might also argue that pointers are dangerous, but 
>> that's not an argument for removing them. Removal of alias this would 
>> make the language unusable for me.
> 
> I don't know if there is a plan now to replace it, I'd guess not. I am 
> not aware of any reason why `alias this` should be removed (for structs 
> at least). If there was a replacement feature, it should be capable of 
> everything `alias this` can currently do IMO, so that there would be an 
> upgrade path.
> 
> There was a project item to 'Explore a replacement for alias this':
> https://github.com/orgs/dlang/projects/22/views/1? 
> pane=issue&itemId=29572699
> 
> Though that was part of a set which was closed (maybe last year).

I have my own plans, but they'll need to be discussed next month.

https://forum.dlang.org/post/llqcjziyurwmyhzseonm@forum.dlang.org

We don't need alias this semantic, but we do need a fallback lookup via 
a method.

Get rid of the overriding capability, and let things stay single 
inheritance.