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For remote references, it can be useful to know when the connection to
be the remote peer has broken (intentionally or otherwise). In
Goblins, this is known as a sever event.
Severence can be detected using on-sever which is provided by
the (goblins) module.
Register handler to be called when connection to remote-refr is severed.
The remote-refr should be a reference to an object on a remote peer, if the connection between the remote peer that the object is located on, the handler is informed. The handler is either a procedure or Goblins object. handler is called with two arguments: the severance type (a symbol) and the reason (a string).
on-sever returns to the caller a Goblins object which when
invoked cancels the interest in severence.
NOTE: If severance has already occured when calling on-sever,
the handler will be informed immediately.