https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41723
Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[8/9/10/11 Regression] |[8/9/10 Regression] Error |Error when using a |when using a qualified name |qualified name to declare a |to declare a nested |nested template |template instantiation as a |instantiation as a friend |friend of the containing |of the containing template |template Known to work| |11.0 --- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> --- Fixed for 11 so far.