[Bug c++/99809] ICE: sorry, unimplemented: unexpected AST of kind nontype_argument_pack

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99809

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-03-29
                 CC|                            |mpolacek at gcc dot gnu.org
           Keywords|ice-on-invalid-code         |ice-on-valid-code
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed, clang++ compiles it.  Reduced:

namespace std {
template <typename> bool is_same_v;
namespace __detail {
template <typename, typename _Up> concept __same_as = is_same_v<_Up>;
}
template <typename _Tp, typename _Up>
concept same_as = __detail::__same_as<_Up, _Tp>;
} // namespace std
void f(auto... args) {
  [](std::same_as<decltype(args)> auto) {};
}
int main() { f(); }