"clang++-16"   -fvisibility-inlines-hidden -Wno-c99-extensions -std=c++20 -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".."  -c -o "/var/boost/run/results/boost/bin.v2/libs/yap/test/reference_returns.test/clang-linux-16~c++20/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/reference_returns.o" "../libs/yap/test/reference_returns.cpp"

../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) {}
                  ^
1 error generated.