compile_warning

/[...]/lager/detail/xform_nodes.hpp:176: warning: ‘lager::detail::xform_cursor_node<zug::composed<zug::map_t<lager::zoom(LensT&&, const lager::writer_mixin<CursorTs>& ...) [with LensT = zug::composed<lager::lens::attr(Member) [with Member = Volume VolumeTree::*]::<lambda(auto:29&&)> >&; CursorTs = {lager::cursor_base<lager::detail::cursor_node<VolumeTree> >}]::<lambda(auto:47&& ...)> > >, lager::update(UpdateT&&) [with UpdateT = lager::zoom(LensT&&, const lager::writer_mixin<CursorTs>& ...) [with LensT = zug::composed<lager::lens::attr(Member) [with Member = Volume VolumeTree::*]::<lambda(auto:29&&)> >&; CursorTs = {lager::cursor_base<lager::detail::cursor_node<VolumeTree> >}]::<lambda(auto:48&&, auto:49&& ...)>]::<lambda(auto:43&&)>, zug::meta::pack<lager::detail::cursor_node<VolumeTree> >, lager::detail::cursor_node>’ has a field ‘lager::detail::xform_cursor_node<zug::composed<zug::map_t<lager::zoom(LensT&&, const lager::writer_mixin<CursorTs>& ...) [with LensT = zug::composed<lager::lens::attr(Member) [with Member = Volume VolumeTree::*]::<lambda(auto:29&&)> >&; CursorTs = {lager::cursor_base<lager::detail::cursor_node<VolumeTree> >}]::<lambda(auto:47&& ...)> > >, lager::update(UpdateT&&) [with UpdateT = lager::zoom(LensT&&, const lager::writer_mixin<CursorTs>& ...) [with LensT = zug::composed<lager::lens::attr(Member) [with Member = Volume VolumeTree::*]::<lambda(auto:29&&)> >&; CursorTs = {lager::cursor_base<lager::detail::cursor_node<VolumeTree> >}]::<lambda(auto:48&&, auto:49&& ...)>]::<lambda(auto:43&&)>, zug::meta::pack<lager::detail::cursor_node<VolumeTree> >, lager::detail::cursor_node>::up_step_’ whose type has no linkage [-Wsubobject-linkage]
  176 | class xform_cursor_node<XForm, SetXForm, zug::meta::pack<Parents...>, Base>
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~