https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100997
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- To make it work just remove the "<int>" in A<int>() {}.
mpolacek at gcc dot gnu.org via Gcc-bugs Wed, 09 Jun 2021 10:22:54 -0700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100997
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- To make it work just remove the "<int>" in A<int>() {}.