https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67594
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> --- The partial specialization C<float> uses the default template argument, so is identical to C<float, 1>, so you have tried to make it its own base class.