@ ProgramNode (location: (0...4))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...4))
    └── body: (length: 1)
        └── @ ArrayNode (location: (0...4))
            ├── elements: (length: 0)
            ├── opening_loc: (0...3) = "%i("
            └── closing_loc: (3...4) = ")"
