@ ProgramNode (location: (0...12))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...12))
    └── body: (length: 2)
        ├── @ CallNode (location: (0...6))
        │   ├── receiver:
        │   │   @ ArrayNode (location: (0...4))
        │   │   ├── elements: (length: 0)
        │   │   ├── opening_loc: (0...3) = "%w["
        │   │   └── closing_loc: (3...4) = "]"
        │   ├── call_operator_loc: (4...5) = "."
        │   ├── message_loc: (5...6) = "b"
        │   ├── opening_loc: ∅
        │   ├── arguments: ∅
        │   ├── closing_loc: ∅
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "b"
        └── @ CallNode (location: (8...12))
            ├── receiver:
            │   @ ArrayNode (location: (8...10))
            │   ├── elements: (length: 0)
            │   ├── opening_loc: (8...9) = "["
            │   └── closing_loc: (9...10) = "]"
            ├── call_operator_loc: (10...11) = "."
            ├── message_loc: (11...12) = "b"
            ├── opening_loc: ∅
            ├── arguments: ∅
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: ∅
            └── name: "b"
