c++/10627: [diagnostic] improve error message when a template is used without argument list

[bangerth@dealii.org]

Synopsis: [diagnostic] improve error message when a template is used without argument list

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Mon May  5 14:45:58 2003
State-Changed-Why:
    Confirmed. Though I'm not so sure about the whether the
    message is not actually quite good: it just says "A is
    not a type", which is true since A is a template. It's
    the implied knowledge that in this context only a type
    can appear that the message isn't transmitting.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10627