https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88294
--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> --- A similar test crashes: bool b; template<typename> struct A { void g () noexcept (b) { } }; int main () { A<int> a; a.g (); } but that's PR88987.