text: #include "DataFormats/TrackerRecHit2D/interface/FastTrackerRecHit.h"
  #include "DataFormats/TrackerRecHit2D/interface/OmniClusterRef.h"
  
  namespace {
    const OmniClusterRef nullRef;
  }
  
  OmniClusterRef const& FastTrackerRecHit::firstClusterRef() const { return nullRef; }
  