https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97358
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Slightly modified testcase where bar is surely instantiated and clang++ still
accepts it. It actually ICEs in all of -std=c++{11,14,17,20}.
struct A;
struct B { A foo (); };
enum C { E };
struct A { template <typename... T> void bar (T... x) { int v {[x...] { x;
}...}; } };
template <typename, C> using F = B;
struct G { F<int, E> baz (); };
enum H { J };
struct D { using K = G; };
template <H> struct I : D { void qux (); };
template <H h> void I<h>::qux () { K a; a.baz ().foo ().bar (); }
void
test ()
{
I<J> i;
i.qux ();
}
