Bring back foreach int indexes

[bachmeier]

On Wednesday, 29 November 2023 at 16:25:55 UTC, Steven 
Schveighoffer wrote:
> On Wednesday, 29 November 2023 at 16:06:32 UTC, bachmeier wrote:

>> foreach(int idx; 0..arr.length) {
>> }
>> ```
>>
>> Apparently someone decided the explicit `int` is an implicit 
>> conversion.
>
> I don't think that ever compiled, even in D1 (64-bit). What 
> happens here is the two ends are converted to a common type (in 
> this case size_t), and you can't assign size_t to int.
>
> But it's easy to fix, just change the top condition via a cast 
> or conversion. The same is not available to a foreach over an 
> array with an index.

Yeah, but it's a matter of ugliness. This looks awful

```
foreach(idx; 0..(cast(int) arr.length)) {
}
```

In the case you're talking about, you could do

```
foreach(_idx, v; arr) {
   int idx = cast(int) _idx;
}
```

I don't mind ugly and verbose code if there's sufficient benefit. 
There's no benefit in this case.