What are the unused but useful feature you know in D?

[Mike Parker via Digitalmars-d]

On Monday, 26 June 2017 at 14:17:26 UTC, Adam D. Ruppe wrote:

>
> So here's how I'd do it:
>
> 1) Add the opposite attributes: `impure`, `throws`, `@gc`, etc.
> 2) Add the module version thing that changes defaults on request
> 3) imagine more potential going forward
>
>
> It isn't even hard.

And along with that a compiler switch to enable strict mode by 
default.

If you, or anyone else, is willing to put this in DIP form, I'll 
gladly do what I can to help minimize the effort required to 
write it up. This is something I'd love to see.