From the D Blog -- GSoC Report: Step

[jmh530 via Digitalmars-d-announce]

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