C++ err msgs

[Jason Merrill]

>>>>> Nathan Myers <ncm@cantrip.org> writes:

 > The reason for using this-> only on functions is that the naming
 > convention requires an _M_ prefix on members and an _S_ prefix 
 > on statics and globals, so the only remaining non-dependent names 
 > subject to hijacking are public member functions.

>From discussion at the Tokyo meeting, it sounds like people are leaning
towards preventing unqualified name lookup from finding members of a
dependent base at all.

Jason