Things that keep D from evolving?

[ZombineDev via Digitalmars-d-learn]

On Saturday, 6 February 2016 at 15:14:06 UTC, Kagamin wrote:
> On Saturday, 6 February 2016 at 08:07:42 UTC, NX wrote:
>> What language semantics prevent precise
>
> Lack of resources. Precise GC needs to know which fields are 
> pointers. Somebody must generate that map. AFAIK there was an 
> experiment on that.

That information has already been present for a couple of releases
(http://dlang.org/spec/traits.html#getPointerBitmap), however 
currently the precise GC is slower than the conservative one, 
because of the overhead the the extra metadata has. For more 
info, you can read the comments on these two PRs:
https://github.com/D-Programming-Language/druntime/pull/1022
https://github.com/D-Programming-Language/druntime/pull/1057