@ ProgramNode (location: (1,0)-(5,1))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(5,1))
    └── body: (length: 2)
        ├── @ ArrayNode (location: (1,0)-(4,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 2)
        │   │   ├── @ SymbolNode (location: (2,0)-(2,1))
        │   │   │   ├── flags: forced_us_ascii_encoding
        │   │   │   ├── opening_loc: ∅
        │   │   │   ├── value_loc: (2,0)-(2,1) = "a"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "a"
        │   │   └── @ SymbolNode (location: (3,0)-(3,1))
        │   │       ├── flags: forced_us_ascii_encoding
        │   │       ├── opening_loc: ∅
        │   │       ├── value_loc: (3,0)-(3,1) = "b"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "b"
        │   ├── opening_loc: (1,0)-(1,3) = "%I("
        │   └── closing_loc: (4,0)-(4,1) = ")"
        └── @ IntegerNode (location: (5,0)-(5,1))
            └── flags: decimal
