The stately := operator feature proposal

[MrzlganeE]

Ok, Diggory, thanks for your consideration. I want to keep the 
code clean and direct, with reliable error messages, with 
consistent output line numbers, with standard semantic highlight 
support in D editors, etc. I do not want to use a level of 
indirection or CTFE all of my code. I would rather write auto 
than have all my code go through CTFE just for one operator. As 
mentioned, I want it available on dpaste too.

I'd just like to say that my intention here specifically is to 
request a feature for the D programming language, that we can all 
use -- it's not just for me and my macro.