@ ProgramNode (location: (1,0)-(3,4))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(3,4))
    └── body: (length: 2)
        ├── @ ArrayNode (location: (1,0)-(1,4))
        │   ├── flags: ∅
        │   ├── elements: (length: 0)
        │   ├── opening_loc: (1,0)-(1,3) = "%W("
        │   └── closing_loc: (1,3)-(1,4) = ")"
        └── @ ArrayNode (location: (3,0)-(3,4))
            ├── flags: ∅
            ├── elements: (length: 0)
            ├── opening_loc: (3,0)-(3,3) = "%w["
            └── closing_loc: (3,3)-(3,4) = "]"