@ ProgramNode (location: (0...9))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...9))
    └── body: (length: 1)
        └── @ StringNode (location: (0...9))
            ├── opening_loc: (0...9) = "<<OOTPÜT"
            ├── content_loc: (10...12) = ".\n"
            ├── closing_loc: (12...20) = "OOTPÜT\n"
            └── unescaped: ".\n"
