************* SYNTAX TREE PRINTOUT ***********

        +-[DUMMYnode]
      +-[CommaOp]
      | +-[STRINGNode,12,"hello world
"]
    +-[RoutineCallOp]
    | +-[IDNode,6,"WRITE"]
  +-[StmtOp]
  | +-[DUMMYnode]
R-[ProgramOp]
  +-[DUMMYnode]