[Bug c++/54420] [4.6/4.7/4.8 Regression] Segmentation fault in decl_mangling_context

[patrik.h.hagglund at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54420

--- Comment #6 from Patrik Hägglund <patrik.h.hagglund at gmail dot com> 
2012-09-19 10:27:37 UTC ---
Jason Merrill wrote:
> In addition, some identifiers are reserved for use by C++ implementations and
> standard libraries (17.6.4.3.2) and shall not be used otherwise; no diagnostic
> is required.

> [...] I don't want to change the release branches.

You seems to imply that "no diagnostic is required" implies "the behavior of
the compiler is undefined". This seems odd.