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Signal a condition by raising it with raise-continuable. Perform
what is needed to handle the restarts protocol. cnd must be a
condition object (simple or compound).
As defined by Common Lisp: signal should return if no handler
accepting the condition is found; in this implementation this normal
return will not happen by default. To implement such behaviour
we have to wrap the whole code in a form like this:
(with-return-to-signal-on-unhandled-exception ?body0 ?body …)
Do what is needed to allow signal to just return if all the
installed condition handlers decline to handle the signalled condition.