@ ProgramNode (location: (0...6))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...6))
    └── body: (length: 1)
        └── @ StringNode (location: (0...6))
            ├── opening_loc: (0...6) = "<<-EOE"
            ├── content_loc: (7...23) = " some\n heredocs\n"
            ├── closing_loc: (23...26) = "EOE"
            └── unescaped: " some\n heredocs\n"
