ProgramNode(0...8)(
  [],
  StatementsNode(0...8)(
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       ConstantReadNode(0...1)(),
       (1...3),
       (3...4),
       nil,
       ArgumentsNode(7...8)([IntegerNode(7...8)()]),
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       nil,
       0,
       "b="
     )]
  )
)
