[Bug c++/104008] [11/12 Regression] New g++ folly compile error since r11-7931-ga2531859bf5bf6cf

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104008

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
            Summary|[11/12 Regression] New g++  |[11/12 Regression] New g++
                   |folly compile error with    |folly compile error since
                   |gcc 11.x. Bisected to       |r11-7931-ga2531859bf5bf6cf
                   |PR99445 c++: Alias template |
                   |in pack expansion           |
           Keywords|needs-reduction             |

--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r11-7931-ga2531859bf5bf6cf.

Test-case:

template <typename...> struct conjunction;
template <typename...> struct disjunction;
template <typename, typename> struct is_same;
template <bool> struct enable_if;
template <bool _Cond> using enable_if_t = typename enable_if<_Cond>::type;
struct B;
struct __uniq_ptr_impl {
  struct _Ptr {
    using type = B *;
  };
  using pointer = _Ptr::type;
};
struct unique_ptr {
  using pointer = __uniq_ptr_impl::pointer;
  unique_ptr(pointer);
};
template <typename, typename... _Args> unique_ptr make_unique(_Args... __args)
{
  return new B(__args...);
}
template <typename T, typename... Ts>
using IsOneOf = disjunction<is_same<T, Ts>...>;
template <typename...> class any_badge;
struct badge {
  badge(any_badge<>);
  badge();
};
template <typename...> struct any_badge {
  template <typename... OtherHolders,
            enable_if_t<conjunction<IsOneOf<OtherHolders>...>::value>>
  any_badge();
};
struct B {
  B(badge);
  unique_ptr b_ = make_unique<B>(badge{});
};