PVS-Studio warning V519 for QT

void Moc::parse()
{
  ....
  index = def.begin + 1;
  namespaceList += def;
  index = rewind;
  ....
}

This suspicious code was found in QT project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'index' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 568, 570. moc.cpp 570

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