[Bug c++/60249] [c++11] Compiler goes into semi-infinite loop with wrong usage of user defined string literals

["3dw4rd at verizon dot net" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60249

--- Comment #6 from Ed Smith-Rowland <3dw4rd at verizon dot net> ---
On 06/27/2014 05:39 PM, paolo.carlini at oracle dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60249
>
> --- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
> Patch looks *great*. If it works, please send it to mailing list ASAP.
>
I think I finally got these weird user-defined string literal bugs. 
"Don't cross the streams!"

Dr. Egon Spengler

PR C++/58781  <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58781>  - Unicode
strings broken in a strange way
PR C++/59867  <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59867>  - Template
string literal loses first symbol
PR C++/60249  <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60249>  - Compiler
goes into semi-infinite loop with wrong usage of user defined string literals
Plus I fixed an misleading error message for string literal operator templates
(not available in C++11).

Built and tested clean on x86_64-linux.

OK?

I would also like to apply this to 4.9.