What is your favorite D feature? [Call for snippets]

[Seb via Digitalmars-d]

On Thursday, 22 June 2017 at 06:08:07 UTC, Paulo Pinto wrote:
> On Thursday, 22 June 2017 at 00:48:25 UTC, Seb wrote:
>> Hi,
>>
>> I am currently trying to modernize the D code example roulette 
>> on the dlang.org front page [1]. Hence, I would love to hear 
>> about your favorite feature(s) in D.
>> Ideas:
>> - favorite language construct
>> - favorite code sample
>> - "only possible in D"
>>
>> Before you ask, yes - I want to add a couple of cool examples 
>> to dlang.org (and yep the roulette rotation is currently 
>> broken [2]).
>>
>> [1] 
>> https://github.com/dlang/dlang.org/pulls?q=is%3Apr+is%3Aopen+label%3A%22Frontpage+example%22
>> [2] https://github.com/dlang/dlang.org/pull/1757
>
> Being a GC enabled systems programming language, following the 
> footsteps of Mesa/Cedar and Modula-3.

Yes :)
... but how do we turn this into an example snippet with < 10 LoC?
(I should have been a bit clear on what I was looking for, sorry).