POD is a pretty simple format to write, but it can be a big pain to deal
with reading it and doing anything useful with it. Most existing POD
parsers care about semantics, like whether a '=item' occurred after an
'=over' but before a 'back', figuring out how to link a 'L<>', and other
things like that.

Pod::Eventual is much less ambitious and much more stupid. Fortunately,
stupid is often better. (That's what I keep telling myself, anyway.)

Pod::Eventual reads line-based input and produces events describing each
POD paragraph or directive it finds. Once complete events are immediately
passed to the 'handle_event' method. This method should be implemented by
Pod::Eventual subclasses. If it isn't, Pod::Eventual's own 'handle_event'
will be called, and will raise an exception.