q about slices, strings

[ag0aep6g]

On 13.07.19 22:35, Kevin Bailey wrote:
>      int[char[2]] aa;
>      auto arr = "ABBBA";
> 
>      foreach (i; 0 .. arr.length - 1)
>          aa[arr[i .. $][0 .. 2]]++;
> 
> which I changed to:
> 
>          aa[arr[i .. i+2][0 .. 2]]++;
> 
> in the hopes of only doing:
> 
>          aa[arr[i .. i+2]]++;
> 
> The question is: Why is the [0..2] still necessary?
> 
[...]
> 
> So why isn't arr[i .. i+2] convertible? Is dmd behind the spec here?

Looks like it. It works in the most basic context:

     char[2] sa = arr[i .. i + 2];

And it works in the AA context when you use the most basic kind of 
expression:

     aa[arr[0 .. 2]]++;

So as far as I can tell, it's just a bug that more complex expressions 
fail in more complex contexts. It should work the same.