Comment 2 for bug 239212

The actual error message was missing:
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While:
  Initializing.
  Getting section buildout.
  Initializing section buildout.
  Getting option buildout:foo.
  Getting section python.
  Initializing section python.
  Installing recipe zc.recipe.egg.

An internal error occured due to a bug in either zc.buildout or in a
recipe being used:

AttributeError:
Buildout instance has no attribute '_allow_hosts'
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