https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81933
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |mpolacek at gcc dot gnu.org
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
With -std=c++17 the error is gone and we only warn:
w.cc: In instantiation of ‘struct std::_Tuple_impl<0, any_udt, any_udt>’:
w.cc:26:40: required from ‘class std::tuple<any_udt, any_udt>’
w.cc:44:29: required from ‘constexpr auto flatten(Tuples ...) [with Tuples =
{any_udt, any_udt}]’
w.cc:48:51: required from here
w.cc:9:8: warning: direct base ‘std::_Head_base<any_udt>’ inaccessible in
‘std::_Tuple_impl<0, any_udt, any_udt>’ due to ambiguity
struct _Tuple_impl<_Idx, _Head, _Tail...> : _Tuple_impl<1, _Tail...>,
clang++ warns the same.
