dennisschagt [1] filed a deletion request for foonathan_memory-shared [2]: Duplicate/Superseded by foonathan_memory [1] I've updated eprosima-fast-dds and eprosima-micro-xrce-dds-agent to depend on that package instead.
[1] https://aur.archlinux.org/packages/foonathan_memory [1] https://aur.archlinux.org/account/dennisschagt/ [2] https://aur.archlinux.org/pkgbase/foonathan_memory-shared/