[Bug c++/90490] [9/10 Regression] ICE on noexcept with decltype expression

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90490

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And we also started rejecting this:

struct R { constexpr operator bool() { return false;} };

template <typename>
struct S {
  void g() noexcept(decltype(R{ }) { }) {
  }
};