https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89612
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #2)
> Reduced (invalid):
>
> template <int> bool b;
>
> template <typename>
> struct C {
> template <typename> friend int foo() noexcept(b<1>);
> };
>
> template <typename> int foo() noexcept(b<1>);
>
> auto a = C<int>();
Started to ICE with r214396.
