Merged revisions 67689 via svnmerge from

Merged revisions 67689 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r67689 | amaury.forgeotdarc | 2008-12-11 00:49:33 +0100 (jeu., 11 déc. 2008) | 13 lines

  Merged revisions 67688 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r67688 | amaury.forgeotdarc | 2008-12-11 00:22:49 +0100 (jeu., 11 déc. 2008) | 6 lines

    #4559: When a context manager's __exit__() method returns an object whose
    conversion to bool raises an exception, 'with' loses that exception.

    Reviewed by Jeffrey Yasskin.
    Already ported to 2.5, will port to 2.6 and 3.0
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