add server type (`Listening_socket of Lwt_unix.file_descr) #282
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Fixes #281 . The variant had to be of type
sexp_opaque
becausefile_descr
is abstract. That would cause a runtime error trying to serialize one of these, but I assume it won't break other variants.(network buffs: is "listening socket" the right description for an inherited systemd socket? AFAIK you don't need to call
listen
but you do need to callaccept
on such a socket, so it sounds right to me)