c++/7721: Very simple (but incorrect) template chokes g++

[Gabriel Dos Reis]

Pop Sébastian <pop@gauvain.u-strasbg.fr> writes:

[...]

| Maybe we could give a better diagnostic for this error...
| Gaby, can you help to fix this error?

Yes, actually there are several instances of this ICE in tthe GNATS --
sorry I can't tell you off hand which ones (but I know there are more
than two :-).  I should submit a patch this week -- I've been gotten
busy by more pressing things.

-- Gaby