https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84282
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- Yes, this is invalid. Obviously you can't convert class a to bool.