On Tuesday, 8 July 2014 at 21:22:31 UTC, Walter Bright wrote:
5. Precise and Concurrent GCThere's been a lot of work on this, but I don't know where we stand on it.
The precise work is held up by: https://github.com/D-Programming-Language/dmd/pull/2480
The GC is due for a redesign / reimplementation.