Merged revisions 70378 via svnmerge from

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

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  r70378 | nick.coghlan | 2009-03-15 13:24:46 +1000 (Sun, 15 Mar 2009) | 1 line

  Make marshalling errors a little more informative as to what went wrong
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