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

[3dw4rd at verizon dot net]

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

--- Comment #10 from Ed Smith-Rowland <3dw4rd at verizon dot net> ---
No, I remember now.  This code *cannot* be right.

With the addition of user-defined literals in C++11 and DR1473
(http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3675.html#1473)
placing keywords immediately after a string literal forms a valid user-defined
string literal.

As an extension we admit macros so placed with a warning.  We do this not to
break user code with inttypes.h and other user-created string macros.

See http://gcc.gnu.org/ml/gcc/2013-06/msg00119.html and onwards - especially
http://gcc.gnu.org/ml/gcc/2013-06/msg00121.html.

This is not a bug.  I vote close INVALID.