[issue3437] robotparser.py missing one line

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

Perhaps more important than a test case, can you explain what states 0, 1 
and 2 are (maybe give them some symbolic names I can at least put in a 
comment)?  This is not my code.  Though I wrote the first version of the 
robotparser module and I served as the person who checked this version 
into the repo, as I recall this is a complete rewrite.

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<http://bugs.python.org/issue3437>
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