Package and virtual functions

[BLM768]

I guess that another solution to this whole mess is to just start 
requiring the use of override; then everyone would be educated 
and it would be obvious where the bug is in the code I posted. 
Since we don't want to break code, though, maybe there should be 
a message prominently displayed on the D homepage telling people 
to use the -w switch until the requirement is actually enforced 
for all code. If that requirement is going to be enforced, 
though, I can't think of a better time than now; otherwise, 
people are going to write code without "override" and eventually 
end up making the same mistakes that I did.