https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101221
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |DUPLICATE --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- Reduced: namespace x { template<class T> struct S; } template<class T> using S = x::S; Which means this is the same as 104091. This is older, but that one has more info so I'll close this as the dup. *** This bug has been marked as a duplicate of bug 104091 ***