https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82506
--- Comment #1 from Nathan Sidwell <nathan at gcc dot gnu.org> --- We fail to stringize raw string literals containing \n chars: ./xg++ -B./ q.cc -E gives: "R\"( )\"" (snipping line markers). That's a regular string literal with a naked LF char in it. This is like the recent fix for __FILE__ dying with filenames containing LF.
