how is this array subtyping inside struct (bug?) possible?

[Avrina]

On Monday, 10 August 2020 at 21:15:58 UTC, mw wrote:
> On Monday, 10 August 2020 at 20:34:33 UTC, kinke wrote:
>>> This does not work:
>>
>> This does and prints the desired output:
>>
>> class SharedArray(T)
>> {
>>   T[] array;
>>   alias array this;
>>
>>   final @disable:
>>   T front();
>>   void popFront();
>>   bool empty();
>> }
>>
>> https://run.dlang.io/is/5ciCue
>
> Thanks. I will accept this as the proper work-around.

There really shouldn't be a workaround, this just outlines that 
there's an ordering problem in writeln. It should be using 
front/popfront as a last resort if it isn't able to use another 
(better) method.