[Bug c++/100997] [c++20] parse error when id-expression of constructor is simple-template-id

[mpolacek at gcc dot gnu.org]

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>() {}.