Mq_server.enqueue_after_timeout: catch all exns (might get e.g. broken pipe).
Mq_server.enqueue_after_timeout: catch all exns (might get e.g. broken pipe).

Failing to do so could kill the server, as the exception would be thrown
inside Lwt.ignore_result.

ahrefs/ocamlmq,mfp/ocamlmq