Recorded merge of revisions 74226,74249 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r74226 | raymond.hettinger | 2009-07-27 16:16:37 -0400 (Mon, 27 Jul 2009) | 1 line

  Issue 6573: Fix set.union() for cases where self is in the argument chain.
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  r74249 | r.david.murray | 2009-07-29 10:12:23 -0400 (Wed, 29 Jul 2009) | 11 lines

  Recorded merge of revisions 74228 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  Applied in r74226.

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    r74228 | raymond.hettinger | 2009-07-27 16:32:04 -0400 (Mon, 27 Jul 2009) | 1 line

    Issue 6573: Fix set.union() for cases where self is in the argument chain.
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