https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81589
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #8) > (In reply to Martin Sebor from comment #2) > > Confirmed with GCC 6 and 7. GCC 8 compiles the translation unit without an > > error. Bisection points to r248153 as the revision that made it work. > > FWIW r248153 also fixed Bug 81190 for gcc-8, and r257981 for this bug fixed > that on gcc-7-branch too. And Bug 80654 was also fixed by the same commits.