PVS-Studio warning V519 for IT++

ifstream &operator>>(ifstream &ifs, vec &v)
{
  ...
  flag = true;
  flag = false;
  ...
}

Strange code. The 'flag' variable is not used further at all.

This suspicious code was found in IT++ project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'flag' object is assigned values twice successively. Perhaps this is a mistake. itpp_mkl vq.cpp 170

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/