https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80451
Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jason at gcc dot gnu.org Summary|[6/7/8 Regression] return |[6/7 Regression] return |implicit type conversion to |implicit type conversion to |std::experimental::optional |std::experimental::optional |does not compile |does not compile --- Comment #12 from Jason Merrill <jason at gcc dot gnu.org> --- Fixed for GCC 8 by the patch for bug 80452.