A couple of namespace+template bugs.

[Jason Merrill]

>>>>> Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de> writes:

> - support using-directives.

I figured that this would be implemented via a new tree code USING_DECL,
which just points to the decl being used.  Lookup would find the USING_DECL
and return the target.

> Since I don't have a grasp on how g++ represents templates, yet, I'm
> not sure how it would fit into this schedule. Since C++ is quite
> restrictive as to how template names can be overloaded with something
> else, it should be an independent matter.

Class template names can't be overloaded with anything else.

Jason