[Issue 23620] 'alias this' is not respected in static array length position

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23620

--- Comment #7 from Max Samukha <maxsamukha at gmail.com> ---
(In reply to Salih Dincer from comment #6)
>   // because :
>     
>   enum index1 = Index();
>   assert(
>     is(typeof(index1) == struct)
>   );
> 
>   auto index2 = Index();
>   assert(
>     !is(typeof(index1) == size_t) &&
>     !is(typeof(index2) == size_t)
>   );
>   
>   // but:
>     
>   enum index = Index();
>   int[index + 1] d; // automatic conversion
>   d[0] = 42; // yeah
> 
> SDB at 79

I still don't understand. Static array declaration expects an integer. 'Index'
implicitly converts to an integer. Why should casts or other hacks be required?

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