void test_circular()
{
  TFile *_file0 = TFile::Open("circular.root");
  TTree *t = 0;
  _file0->GetObject("T",t);

  t->SetScanField(1);
  t->Print();
  printf("t->FindLeaf(\"px\"): %p\nt->FindLeaf(\"ROOT\"): %p\n",
         t->FindLeaf("px"),
         t->FindLeaf("pROOT"));

  t->Scan("px.px:py.px:pz.px:random:i");
  t->Scan("px:py:pz:random:i");
  t->Scan("px:py.ROOT:pz:random:i");
  t->Scan("px:pm:pz:random:i");

return ;
}