[Bug c++/99844] [9/10/11 Regression] ICE: unexpected expression 'B' of kind template_parm_index

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99844

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We also ICE on

template <bool... B>
struct S {
 void fn() noexcept(B);
};

void fn ()
{
  S<true> s;
  s.fn();
}

so this needs to be fixed more generally than just in explicit().