ProgramNode(0...11)(
  [],
  StatementsNode(0...11)(
    [ArrayNode(0...9)(
       [SymbolNode(4...5)(nil, (4...5), nil, "a"),
        SymbolNode(6...7)(nil, (6...7), nil, "b")],
       (0...3),
       (8...9)
     ),
     IntegerNode(10...11)()]
  )
)
