Merged revisions 71984 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r71984 | walter.doerwald | 2009-04-26 22:51:44 +0200 (So, 26 Apr 2009) | 2 lines

  Use test.test_support.EnvironmentVarGuard where tests change environment vars.
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