[MacPorts] #66440: py27-m2r @0.2.1: AttributeError: 'module' object has no attribute 'BlockGrammar'

[MacPorts]

#66440: py27-m2r @0.2.1: AttributeError: 'module' object has no attribute
'BlockGrammar'
---------------------------------+---------------------------------
  Reporter:  ryandesign          |      Owner:  MarcusCalhoun-Lopez
      Type:  defect              |     Status:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.8.0
Resolution:                      |   Keywords:
      Port:  py-m2r, py-mistune  |
---------------------------------+---------------------------------

Comment (by ryandesign):

 [changeset:d5d588b0d9e483b8a91030c8107b4ee013facd0a/macports-ports py-
 mistune was updated to 2.0.5 on February 15] but as I said above nobody
 who had the downgraded 0.8.4 is receiving these updates because the
 `epoch` was decreased (which it never can be). Please either increase the
 `epoch` back to what it was and fix py-m2r to be compatible with this new
 py-mistune, or else increase the `epoch` to greater than what it was
 before and downgrade back to 0.8.4 once more to fix py-m2r.

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Ticket URL: <https://trac.macports.org/ticket/66440#comment:4>
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