@ ProgramNode (location: (1,0)-(2,5))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(2,5))
    └── body: (length: 2)
        ├── @ CallNode (location: (1,0)-(1,3))
        │   ├── flags: variable_call
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :foo
        │   ├── message_loc: (1,0)-(1,3) = "foo"
        │   ├── opening_loc: ∅
        │   ├── arguments: ∅
        │   ├── closing_loc: ∅
        │   └── block: ∅
        └── @ RangeNode (location: (2,0)-(2,5))
            ├── flags: ∅
            ├── left: ∅
            ├── right:
            │   @ IntegerNode (location: (2,2)-(2,5))
            │   └── flags: decimal
            └── operator_loc: (2,0)-(2,2) = ".."
