compiler support added for precise GC

[Michal Minich]

On Wednesday, 18 April 2012 at 10:07:59 UTC, Robert Clipsham 
wrote:
> // a.d
> class Base { /* whatever magic to get derived classes */ }
> // b.d
> import a;
> class Derived : Base {}
> void main() {}

to find derived classes at runtime:
http://forum.dlang.org/thread/mailman.1052.1292505452.21107.digitalmars-d-learn@puremagic.com#post-op.vns7nfjpvxi10f:40biotronic-pc.lan