PVS-Studio warning V558 for SeqAn

template <typename TStringSet, typename TSpec>
inline Iter<TStringSet, ConcatVirtual<TSpec> > const &
operator++(Iter<TStringSet, ConcatVirtual<TSpec> > & me, int)
{
    Iter<TStringSet, ConcatVirtual<TSpec> > before = me;
    goNext(me);
    return before;
}

This suspicious code was found in SeqAn project by PVS-Studio static code analyzer.
Warning message is:
V558 Function returns the reference to temporary local object: before. iter_concat_virtual.h 277

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/