"clang++-17"   -fvisibility-inlines-hidden -Wno-c99-extensions -std=c++20 -Wall -Wextra -fPIC -pthread -O0 -fno-inline -Wall -fvisibility=hidden -m64 --target=x86_64-pc-linux  -DBOOST_ALL_NO_LIB=1 -DBOOST_COBALT_USE_STD_PMR=1   -I".." -I"/var/boost/run/boost_root/libs/assert/include" -I"/var/boost/run/boost_root/libs/container_hash/include" -I"/var/boost/run/boost_root/libs/core/include" -I"/var/boost/run/boost_root/libs/describe/include" -I"/var/boost/run/boost_root/libs/mp11/include" -I"/var/boost/run/boost_root/libs/throw_exception/include" -I"/var/boost/run/boost_root/libs/type_index/include" -I"/var/boost/run/boost_root/libs/yap/include"  -c -o "/var/boost/run/results/boost/bin.v2/libs/yap/test/reference_returns.test/clang-linux-17~c++20~warn/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/reference_returns.o" "../libs/yap/test/reference_returns.cpp"

In file included from ../libs/yap/test/reference_returns.cpp:6:
In file included from ../boost/yap/expression.hpp:9:
../boost/yap/algorithm.hpp:449:68: warning: unused parameter 'i' [-Wunused-parameter]
    constexpr decltype(auto) argument(Expr && expr, hana::llong<I> i)
                                                                   ^
In file included from ../libs/yap/test/reference_returns.cpp:6:
In file included from ../boost/yap/expression.hpp:9:
In file included from ../boost/yap/algorithm.hpp:614:
../boost/yap/detail/transform.hpp:267:74: warning: unused parameter 'transforms' [-Wunused-parameter]
        constexpr decltype(auto) operator()(Expr && expr, TransformTuple transforms) const
                                                                         ^
../boost/yap/detail/transform.hpp:292:46: warning: unused parameter 'expr' [-Wunused-parameter]
        ExprTemplate<Kind, OldTuple> const & expr, NewTuple && tuple)
                                             ^
../boost/yap/detail/transform.hpp:298:54: warning: unused parameter 'expr' [-Wunused-parameter]
    constexpr auto make_expr_from_tuple(Expr const & expr, NewTuple && tuple)
                                                     ^
../libs/yap/test/reference_returns.cpp:28:37: warning: unused parameter 'a' [-Wunused-parameter]
    number const & operator+(number a, number b) { return the_result; }
                                    ^
../libs/yap/test/reference_returns.cpp:28:47: warning: unused parameter 'b' [-Wunused-parameter]
    number const & operator+(number a, number b) { return the_result; }
                                              ^
../libs/yap/test/reference_returns.cpp:30:31: warning: unused parameter 'a' [-Wunused-parameter]
    number & operator-(number a, number b) { return a_result; }
                              ^
../libs/yap/test/reference_returns.cpp:30:41: warning: unused parameter 'b' [-Wunused-parameter]
    number & operator-(number a, number b) { return a_result; }
                                        ^
../libs/yap/test/reference_returns.cpp:36:43: error: call to constructor of 'term<reference_returning::number>' (aka 'expression<expr_kind::terminal, hana::tuple<number>>') is ambiguous
        term<reference_returning::number> unity = {{1.0}};
                                          ^       ~~~~~~~
../boost/yap/expression.hpp:136:19: note: candidate constructor
        constexpr expression(T && t) : elements(static_cast<T &&>(t)) {}
                  ^
../boost/yap/expression.hpp:142:19: note: candidate constructor
        constexpr expression(hana::tuple<T> && rhs) : elements(std::move(rhs))
                  ^
../boost/yap/expression.hpp:139:19: note: candidate constructor
        constexpr expression(hana::tuple<T> const & rhs) : elements(rhs) {}
                  ^
8 warnings and 1 error generated.