ProgramNode(0...9)(
  [],
  StatementsNode(0...9)(
    [CallOperatorWriteNode(0...9)(
       CallNode(0...4)(
         ConstantReadNode(0...1)(),
         (1...3),
         (3...4),
         nil,
         nil,
         nil,
         nil,
         0,
         "b="
       ),
       (5...7),
       IntegerNode(8...9)(),
       :+
     )]
  )
)
