An instance of ThreadDeath is thrown in the victim
thread when the stop method with zero arguments in
class Thread is called.
An application should catch instances of this class only if it
must clean up after being terminated asynchronously. If
ThreadDeath is caught by a method, it is important
that it be rethrown so that the thread actually dies.
The top-level error handler does not print out a message if
ThreadDeath is never caught.
The class ThreadDeath is specifically a subclass of
Error rather than Exception, even though
it is a "normal occurrence", because many applications
catch all occurrences of Exception and then discard
the exception.
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