"g++-12"   -fvisibility-inlines-hidden -std=c++17 -fPIC -m64 -pthread -O0 -fno-inline -Wall -fvisibility=hidden  -DBOOST_ALL_NO_LIB=1 -DBOOST_COBALT_USE_STD_PMR=1   -I".." -I"../libs/hana/test/_include" -I"/var/boost/run/boost_root/libs/assert/include" -I"/var/boost/run/boost_root/libs/core/include" -I"/var/boost/run/boost_root/libs/hana/include" -I"/var/boost/run/boost_root/libs/throw_exception/include" -I"/var/boost/run/boost_root/libs/tuple/include"  -c -o "/var/boost/run/results/boost/bin.v2/libs/hana/test/test~ext~std~array~issue_304.test/gcc-12~c++17/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/ext/std/array/issue_304.o" "../libs/hana/test/ext/std/array/issue_304.cpp"

In file included from ../boost/hana/basic_tuple.hpp:28,
                 from ../boost/hana/functional/partial.hpp:13,
                 from ../boost/hana/fold_left.hpp:19,
                 from ../boost/hana/concept/foldable.hpp:19,
                 from ../boost/hana/core/to.hpp:16,
                 from ../boost/hana/bool.hpp:17,
                 from ../boost/hana/ext/std/array.hpp:13,
                 from ../libs/hana/test/ext/std/array/issue_304.cpp:6:
../boost/hana/fwd/unpack.hpp: In instantiation of 'struct boost::hana::unpack_impl<boost::hana::ext::std::array_tag, void>':
../boost/hana/core/default.hpp:26:9:   required by substitution of 'template<class Method> struct boost::hana::is_default<Method, decltype ((void)(static_cast<boost::hana::default_>((*(Method*)(0)))))> [with Method = boost::hana::unpack_impl<boost::hana::ext::std::array_tag, void>]'
../boost/hana/concept/foldable.hpp:28:65:   required from 'struct boost::hana::Foldable<boost::hana::ext::std::array_tag>'
../boost/hana/core/to.hpp:188:28:   required by substitution of 'template<class S, class F> struct boost::hana::to_impl<S, F, boost::hana::when<(boost::hana::Sequence<S>::value && boost::hana::Foldable<F>::value)> > [with S = boost::hana::tuple_tag; F = boost::hana::ext::std::array_tag]'
../boost/hana/core/to.hpp:36:12:   required from 'struct boost::hana::to_impl<boost::hana::tuple_tag, boost::hana::ext::std::array_tag, void>'
../boost/hana/core/to.hpp:78:40:   required from 'constexpr decltype(auto) boost::hana::to_t<To>::operator()(X&&) const [with X = std::array<Foo, 2>; To = boost::hana::tuple_tag]'
../libs/hana/test/ext/std/array/issue_304.cpp:18:36:   required from here
../boost/hana/fwd/unpack.hpp:84:12: error: ambiguous template instantiation for 'struct boost::hana::unpack_impl<boost::hana::ext::std::array_tag, boost::hana::when<true> >'
   84 |     struct unpack_impl : unpack_impl<T, when<true>> { };
      |            ^~~~~~~~~~~
In file included from ../boost/hana/fold_left.hpp:20:
../boost/hana/unpack.hpp:52:12: note: candidates are: 'template<class T, bool condition> struct boost::hana::unpack_impl<T, boost::hana::when<condition> > [with T = boost::hana::ext::std::array_tag; bool condition = true]'
   52 |     struct unpack_impl<T, when<condition>> : default_ {
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../boost/hana/unpack.hpp:62:12: note:                 'template<class It> struct boost::hana::unpack_impl<It, boost::hana::when<(boost::hana::Iterable<It>::value && (! boost::hana::is_default<boost::hana::length_impl<It> >::value))> > [with It = boost::hana::ext::std::array_tag]'
   62 |     struct unpack_impl<It, when<
      |            ^~~~~~~~~~~~~~~~~~~~~
   63 |         hana::Iterable<It>::value && !is_default<length_impl<It>>::value
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   64 |     >> {
      |     ~~      
../boost/hana/fwd/unpack.hpp:84:12: error: invalid use of incomplete type 'struct boost::hana::unpack_impl<boost::hana::ext::std::array_tag, boost::hana::when<true> >'
   84 |     struct unpack_impl : unpack_impl<T, when<true>> { };
      |            ^~~~~~~~~~~
../boost/hana/fwd/unpack.hpp:84:12: note: declaration of 'struct boost::hana::unpack_impl<boost::hana::ext::std::array_tag, boost::hana::when<true> >'
../boost/hana/core/to.hpp: In instantiation of 'struct boost::hana::to_impl<boost::hana::tuple_tag, boost::hana::ext::std::array_tag, void>':
../boost/hana/core/to.hpp:78:40:   required from 'constexpr decltype(auto) boost::hana::to_t<To>::operator()(X&&) const [with X = std::array<Foo, 2>; To = boost::hana::tuple_tag]'
../libs/hana/test/ext/std/array/issue_304.cpp:18:36:   required from here
../boost/hana/core/to.hpp:36:12: error: ambiguous template instantiation for 'struct boost::hana::to_impl<boost::hana::tuple_tag, boost::hana::ext::std::array_tag, boost::hana::when<true> >'
   36 |     struct to_impl : to_impl<To, From, when<true>> { };
      |            ^~~~~~~
../boost/hana/core/to.hpp:62:12: note: candidates are: 'template<class To, class From, bool condition> struct boost::hana::to_impl<To, From, boost::hana::when<condition> > [with To = boost::hana::tuple_tag; From = boost::hana::ext::std::array_tag; bool condition = true]'
   62 |     struct to_impl<To, From, when<condition>>
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../boost/hana/core/to.hpp:186:12: note:                 'template<class S, class F> struct boost::hana::to_impl<S, F, boost::hana::when<(boost::hana::Sequence<S>::value && boost::hana::Foldable<F>::value)> > [with S = boost::hana::tuple_tag; F = boost::hana::ext::std::array_tag]'
  186 |     struct to_impl<S, F, when<
      |            ^~~~~~~~~~~~~~~~~~~
  187 |         hana::Sequence<S>::value &&
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~
  188 |         hana::Foldable<F>::value
      |         ~~~~~~~~~~~~~~~~~~~~~~~~
  189 |     >> : embedding<Sequence<F>::value> {
      |     ~~      
../boost/hana/core/to.hpp:36:12: error: invalid use of incomplete type 'struct boost::hana::to_impl<boost::hana::tuple_tag, boost::hana::ext::std::array_tag, boost::hana::when<true> >'
   36 |     struct to_impl : to_impl<To, From, when<true>> { };
      |            ^~~~~~~
../boost/hana/core/to.hpp:36:12: note: declaration of 'struct boost::hana::to_impl<boost::hana::tuple_tag, boost::hana::ext::std::array_tag, boost::hana::when<true> >'
../boost/hana/core/to.hpp: In instantiation of 'constexpr decltype(auto) boost::hana::to_t<To>::operator()(X&&) const [with X = std::array<Foo, 2>; To = boost::hana::tuple_tag]':
../libs/hana/test/ext/std/array/issue_304.cpp:18:36:   required from here
../boost/hana/core/to.hpp:78:40: error: 'apply' is not a member of 'boost::hana::to_impl<boost::hana::tuple_tag, boost::hana::ext::std::array_tag, void>'
   78 |         return to_impl<To, From>::apply(static_cast<X&&>(x));
      |                ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~