https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70213
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to work| |10.1.0 Known to fail| |9.4.0 Target Milestone|--- |10.0 Resolution|--- |FIXED Status|UNCONFIRMED |RESOLVED Keywords| |accepts-invalid --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Fixed in GCC 10, There was a huge rewrite of the concepts for GCC 10 which most likely fixed this.