[Bug c++/58057] gcc lexer cannot parse extern "\x43" void blah() with option -std=c++0x;

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58057

--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Ed, your analysis matches my intuition, but the error message is still very
poor: to the user something like "... before STRING_USERDEF..." makes no sense
at all. Can we improve it?