What template features are still lacking in g++?

[JDonner]

Hi,

  What are the template features still lacking that keep g++ 
from doing things like Andrei Alexandrescu's 'Loki' without 
special adaptations?  (I do know that someone's adapted 
Loki to gcc2.95). 

I think it'd be nice to put a list of the features lacking 
on the features page, just to make it easier to know where 
g++ stands. 

JDonner