https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81043
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed|2019-08-12 00:00:00 |2019-10-15 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- Trunk now says: 81043.cc:5:24: error: 'A<T>' does not match original declaration 5 | template <C1 T> struct A<T>; | ^~~~ 81043.cc:3:30: note: original template declaration here 3 | template <typename T> struct A; | ^ That's not much better.