Things that keep D from evolving?

[rsw0x via Digitalmars-d-learn]

On Friday, 12 February 2016 at 15:12:19 UTC, Steven Schveighoffer 
wrote:
> but I'm unaware of such an optimization, and it definitely 
> isn't triggered specifically by 'in'. 'in' is literally 
> replaced with 'scope const' when it is a storage class.
>
> -Steve

I'd imagine GCC or LLVM may be able to make use of such (type) 
information for optimizations — moreso probably LLVM due to all 
the functional languages that use it nowadays.