input/trackDbLoop/composite.ra
  comp
    compSubA
    compSubB
  loneTrack
input/trackDbLoop/self.ra
  error: Track selfLoop lists itself as its own parent
input/trackDbLoop/loop2.ra
  error: Track loopA is its own ancestor through its parent loopB
input/trackDbLoop/loop3.ra
  error: Track loopA is its own ancestor through its parent loopB
