Recorded merge of revisions 74429 via svnmerge from

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  r74429 | brett.cannon | 2009-08-13 21:27:12 +0200 (Do, 13 Aug 2009) | 5 lines

  Expat could crash if given the wrong kind of input by never stopping its
  tokenizing step.

  Thanks to Ivan Krstić for the patch.
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