Improvements to switch

[Basile B.]

On Tuesday, 16 April 2024 at 10:34:21 UTC, ryuukk_ wrote:
> It is time to make them nice to use
>
>
> - allow them as expression
>
> ```D
> int myvalue = switch(code) {
>     // ...
> };
>
> ```

About this, the main point is rather

```d
/*-->*/ const /*<--*/ int myvalue = switch(code) {
     // ...
};
```

"ah finally you can define a const var decl that relies on 
branching" (without using the conditional expression...)

Then there's something you must think about, that's the fallback, 
i.e the default
clause. If you use the default clause to error you're lucky 
because D has noreturn now.