/usr/include/boost/hana/functional/ is in libboost1.65-dev 1.65.1+dfsg-0ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/hana/functional/always.hpp
/usr/include/boost/hana/functional/apply.hpp
/usr/include/boost/hana/functional/arg.hpp
/usr/include/boost/hana/functional/capture.hpp
/usr/include/boost/hana/functional/compose.hpp
/usr/include/boost/hana/functional/curry.hpp
/usr/include/boost/hana/functional/demux.hpp
/usr/include/boost/hana/functional/fix.hpp
/usr/include/boost/hana/functional/flip.hpp
/usr/include/boost/hana/functional/id.hpp
/usr/include/boost/hana/functional/infix.hpp
/usr/include/boost/hana/functional/iterate.hpp
/usr/include/boost/hana/functional/lockstep.hpp
/usr/include/boost/hana/functional/on.hpp
/usr/include/boost/hana/functional/overload.hpp
/usr/include/boost/hana/functional/overload_linearly.hpp
/usr/include/boost/hana/functional/partial.hpp
/usr/include/boost/hana/functional/placeholder.hpp
/usr/include/boost/hana/functional/reverse_partial.hpp