A couple of extensions to `with` that would be worthwhile

[Mathias LANG]

On Wednesday, 13 October 2021 at 19:30:43 UTC, Andrei 
Alexandrescu wrote:
> On 2021-10-13 15:28, Adam D Ruppe wrote:
>> On Wednesday, 13 October 2021 at 19:18:55 UTC, Andrei 
>> Alexandrescu wrote:
>>> The point is that with keeps the entire expression live, even 
>>> if you only care about a part of it:
>> 
>> OK, that explains things now. I see what you're going for.
>> 
>> Not in love with it being `with` that works differently than 
>> the other `with`s but it kinda makes sense anyway.
>> 
>> The lambda pattern though does have a few other advantages... 
>> I think it is generally easier to use... but gotta chew on it 
>> a bit.
>
> One major issue with the lambda pattern is composition. Every 
> layer of composition introduces yet another scope AND 
> parenthesis level. That doesn't scale well at all.

The lack of composability is annoying, but how often is it 
practically a problem ? Those functions are used for D to C 
string conversion, so in practice they are always at the end of 
the pipeline (just like `each` is). I don't really see how those 
could justify a new language feature.