Not only that. It can also cause NPE to be thrown. That would happen if there
is such a rule:
rule "Update Recording"
when
$m : Motion()
$r : Recording()
then
System.err.println("Recording: " + $r);
retract($r);
end
then this rule may be executed multiple times and $r could be NULL (since
there should be only one instance of a Recording at most). I would call it a
bug.
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