@ ProgramNode (location: (0...10))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...10))
    └── body: (length: 2)
        ├── @ ArrayNode (location: (0...4))
        │   ├── elements: (length: 0)
        │   ├── opening_loc: (0...3) = "%W("
        │   └── closing_loc: (3...4) = ")"
        └── @ ArrayNode (location: (6...10))
            ├── elements: (length: 0)
            ├── opening_loc: (6...9) = "%w["
            └── closing_loc: (9...10) = "]"
