@ ProgramNode (location: (4,0)-(7,1))
├── locals: []
└── statements:
    @ StatementsNode (location: (4,0)-(7,1))
    └── body: (length: 3)
        ├── @ CallNode (location: (4,0)-(4,1))
        │   ├── flags: variable_call, ignore_visibility
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :a
        │   ├── message_loc: (4,0)-(4,1) = "a"
        │   ├── opening_loc: ∅
        │   ├── arguments: ∅
        │   ├── closing_loc: ∅
        │   └── block: ∅
        ├── @ CallNode (location: (5,0)-(5,1))
        │   ├── flags: variable_call, ignore_visibility
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :b
        │   ├── message_loc: (5,0)-(5,1) = "b"
        │   ├── opening_loc: ∅
        │   ├── arguments: ∅
        │   ├── closing_loc: ∅
        │   └── block: ∅
        └── @ CallNode (location: (7,0)-(7,1))
            ├── flags: variable_call, ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :c
            ├── message_loc: (7,0)-(7,1) = "c"
            ├── opening_loc: ∅
            ├── arguments: ∅
            ├── closing_loc: ∅
            └── block: ∅