@ ProgramNode (location: (0...5))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...5))
    └── body: (length: 1)
        └── @ StringNode (location: (0...5))
            ├── opening_loc: (0...5) = "<<EOS"
            ├── content_loc: (6...14) = "\r\n\r\r\n\\r\n"
            ├── closing_loc: (14...18) = "EOS\n"
            └── unescaped: "\r\n\r\r\n\r\n"
