ProgramNode(0...24)(
  [],
  StatementsNode(0...24)(
    [InterpolatedStringNode(0...24)(
       (0...5),
       [StringNode(7...12)(nil, (7...12), nil, "foo\r"),
        EmbeddedVariableNode(12...17)(
          (12...13),
          InstanceVariableReadNode(13...17)()
        ),
        StringNode(17...19)(nil, (17...19), nil, "\r\n")],
       (19...24)
     )]
  )
)
