logilab-astng #18186 astng crash on python2.6 [validation pending]

__bases__ modification produces a crash with python2.6 : traceback

$ python2.6 ~/src/pylint/lint.py t.py
Traceback (most recent call last):
File "src/pylint/lint.py", line 31, in <module>
  from pylint.checkers import utils
File "src/pylint/checkers/__init__.py", line 39, in <module>
  from logilab.astng.utils import ASTWalker
File "src/logilab/astng/__init__.py", line 58, in <module>
  from logilab.astng.nodes import *
File "src/logilab/astng/nodes.py", line 133, in <module>
  cls.__bases__ = (StmtMixIn, NodeNG) + cls.__bases__
TypeError: __bases__ assignment: 'StmtMixIn' object layout differs from 'stmt'
priorityimportant
typebug
done in0.20.0
load3.000
load left0.000
closed by<not specified>