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Changing the summary of this issue to reflect the real
problem.   The attachment 1072623.py illustrates that if the
end boundary of a string being parsed by the FeedParser does
not have a trailing newline, the parser doesn't recognize
this as an end boundary.  It just so happens that your
example produces a message string with that property (which
isn't a bug).

The fix is about as trivial as you can get: one character.