@ ProgramNode (location: (0...7))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...7))
    └── body: (length: 1)
        └── @ StringNode (location: (0...7))
            ├── opening_loc: (0...7) = "<<'eot'"
            ├── content_loc: (9...15) = "body\r\n"
            ├── closing_loc: (15...19) = "eot\n"
            └── unescaped: "body\r\n"
