From the D Blog -- GSoC Report: Step

[Yuxuan Shui via Digitalmars-d-announce]

On Friday, 9 September 2016 at 18:46:30 UTC, jmh530 wrote:
> On Friday, 9 September 2016 at 18:22:02 UTC, ciechowoj wrote:
>>
>>> I'm not sure about any special syntax which is expected for 
>>> languages which have built-in sets. It would probably be 
>>> overkill to add syntax support, but I'm not sure how often 
>>> people use set literals or not.
>>
>> E.g. Python has build in literals for sets. C++ has sets in 
>> standard library. I see the points against adding something 
>> like this to the core of language, but it should be at least 
>> in the standard library.
>
> You might find the following SO question informative.
>
> http://stackoverflow.com/questions/7162274/why-is-d-missing-container-classes

That was 5 years ago! Why do things move so slowly...