Precise GC state

[Nordlöw]

On Wednesday, 22 November 2017 at 13:44:22 UTC, Nicholas Wilson 
wrote:
> Thats a linker(?) limitation for OMF (or whatever is the win32 
> object file format).

Was just fixed!

What improvements to D's concurrency model is made possible with 
this precise GC?

I recall Martin Nowak saying at DConf 2016 that

a precise GC will enable data with isolated or immutable 
indirections to be safely moved between threads