https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79686
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2017-02-23 Ever confirmed|0 |1 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- There used to be a similar error for class templates like X<T, U...> so the concepts branch might have inherited that bug and then not got fixed when the class template case was fixed.