nltk/nltk — pull request #292 by heatherleaf (2012-09-07 21:17:13+00:00)
Title: Fix to #229

I hope this finally fixes #229.

I had to do some minor hacks in `ParentedTree.__init__` and `MultiParentedTree.__init__`, for fixing broken parent pointers.

Maybe it was a bad idea to remove `__new__` in 8284903. But on the other hand, that code was not very nice either...