When running a distutils installation of Cython (which uses lib2to3) as "python3.2 -O setup.py bdist", I get this:

Skipping implicit fixer: buffer
Skipping implicit fixer: idioms
Skipping implicit fixer: set_literal
Skipping implicit fixer: ws_comma
Traceback (most recent call last):
  File "setup.py", line 319, in <module>
    **setup_args
  File "/opt/python3.2-opt/lib/python3.2/distutils/core.py", line 149, in setup
    dist.run_commands()
  File "/opt/python3.2-opt/lib/python3.2/distutils/dist.py", line 919, in run_commands
    self.run_command(cmd)
  File "/opt/python3.2-opt/lib/python3.2/distutils/dist.py", line 938, in run_command
    cmd_obj.run()
  File "/opt/python3.2-opt/lib/python3.2/distutils/command/bdist.py", line 132, in run
    self.run_command(cmd_name)
  File "/opt/python3.2-opt/lib/python3.2/distutils/cmd.py", line 315, in run_command
    self.distribution.run_command(command)
  File "/opt/python3.2-opt/lib/python3.2/distutils/dist.py", line 938, in run_command
    cmd_obj.run()
  File "/opt/python3.2-opt/lib/python3.2/distutils/command/bdist_dumb.py", line 74, in run
    self.run_command('build')
  File "/opt/python3.2-opt/lib/python3.2/distutils/cmd.py", line 315, in run_command
    self.distribution.run_command(command)
  File "/opt/python3.2-opt/lib/python3.2/distutils/dist.py", line 938, in run_command
    cmd_obj.run()
  File "/opt/python3.2-opt/lib/python3.2/distutils/command/build.py", line 128, in run
    self.run_command(cmd_name)
  File "/opt/python3.2-opt/lib/python3.2/distutils/cmd.py", line 315, in run_command
    self.distribution.run_command(command)
  File "/opt/python3.2-opt/lib/python3.2/distutils/dist.py", line 938, in run_command
    cmd_obj.run()
  File "/opt/python3.2-opt/lib/python3.2/distutils/command/build_py.py", line 404, in run
    self.run_2to3(self.updated_files)
  File "/opt/python3.2-opt/lib/python3.2/distutils/util.py", line 649, in run_2to3
    return run_2to3(files, self.fixer_names, self.options, self.explicit)
  File "/opt/python3.2-opt/lib/python3.2/distutils/util.py", line 597, in run_2to3
    r.refactor(files, write=True)
  File "/opt/python3.2-opt/lib/python3.2/lib2to3/refactor.py", line 296, in refactor
    self.refactor_file(dir_or_file, write, doctests_only)
  File "/opt/python3.2-opt/lib/python3.2/lib2to3/refactor.py", line 349, in refactor_file
    tree = self.refactor_string(input, filename)
  File "/opt/python3.2-opt/lib/python3.2/lib2to3/refactor.py", line 381, in refactor_string
    self.refactor_tree(tree, name)
  File "/opt/python3.2-opt/lib/python3.2/lib2to3/refactor.py", line 442, in refactor_tree
    find_root(node)
  File "/opt/python3.2-opt/lib/python3.2/lib2to3/fixer_util.py", line 276, in find_root
    while node.type != syms.file_input:
AttributeError: 'NoneType' object has no attribute 'type'