When attempting to build the LaTeX for the documentation provided with 
Python 3.0b1, the following error is produced while writing the Library 
documentation (full backtrace provided). I am running Sphinx on Python 
2.5. 

Traceback (most recent call last):
  File "/Users/vmanis/myenv/py3k/Doc/tools/sphinx/__init__.py", line 
135, in main
    app.builder.build_update()
  File "/Users/vmanis/myenv/py3k/Doc/tools/sphinx/builder.py", line 194, 
in build_update
    self.build(['__all__'], to_build)
  File "/Users/vmanis/myenv/py3k/Doc/tools/sphinx/builder.py", line 238, 
in build
    self.write(docnames, updated_docnames, method)
  File "/Users/vmanis/myenv/py3k/Doc/tools/sphinx/builder.py", line 852, 
in write
    docwriter.write(doctree, destination)
  File 
"/Users/vmanis/myenv/py3k/Doc/tools/docutils/writers/__init__.py", line 
78, in write
    self.translate()
  File "/Users/vmanis/myenv/py3k/Doc/tools/sphinx/latexwriter.py", line 
70, in translate
    self.document.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 159, 
in walkabout
    child.walkabout(visitor)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 151, 
in walkabout
    visitor.dispatch_visit(self)
  File "/Users/vmanis/myenv/py3k/Doc/tools/docutils/nodes.py", line 
1502, in dispatch_visit
    return method(node)
  File "/Users/vmanis/myenv/py3k/Doc/tools/sphinx/latexwriter.py", line 
1012, in unknown_visit
    raise NotImplementedError("Unknown node: " + 
node.__class__.__name__)
NotImplementedError: Unknown node: subscript