https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80955
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This causes a regression for:
const char* err() { return "Error in "__FILE__; }
file.cc: In function ‘const char* err()’:
file.cc:1:28: error: unable to find string literal operator
‘operator""__FILE__’ with ‘const char [10]’, ‘long unsigned int’ arguments
const char* err() { return "Error in "__FILE__; }
^~~~~~~~~~~~~~~~~~~
With GCC 7 this gave a warning about not finding a literal operator, and then
continued as the author intended, i.e. concatenating the two strings.
