@ ProgramNode (location: (0...3))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...3))
    └── body: (length: 1)
        └── @ RangeNode (location: (0...3))
            ├── left: ∅
            ├── right:
            │   @ IntegerNode (location: (2...3))
            │   └── flags: decimal
            ├── operator_loc: (0...2) = ".."
            └── flags: ∅
