[Bug c++/16564] g++ seems to go into an infinite loop after errors

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16564

--- Comment #22 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Volker Reichelt from comment #18)
> The first error message about exceeding the maximum template instantiation
> depth appears rather quickly. So maybe we could make the first error message
> a fatal one to avoid further processing of potentially bogus nested classes.

This is a patch doing exactly that:
https://gcc.gnu.org/ml/gcc-patches/2014-08/msg01709.html

However, I probably won't have time until the Christmas holidays to work on it,
so please anyone feel free to take it and get it reviewed and applied. Thanks!