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@ ProgramNode (location: (1,0)-(3,2))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(3,2))
└── body: (length: 1)
└── @ CallNode (location: (1,0)-(3,2))
├── receiver:
│ @ CallNode (location: (1,0)-(2,2))
│ ├── receiver:
│ │ @ CallNode (location: (1,0)-(1,1))
│ │ ├── receiver: ∅
│ │ ├── call_operator_loc: ∅
│ │ ├── message_loc: (1,0)-(1,1) = "a"
│ │ ├── opening_loc: ∅
│ │ ├── arguments: ∅
│ │ ├── closing_loc: ∅
│ │ ├── block: ∅
│ │ ├── flags: variable_call
│ │ └── name: "a"
│ ├── call_operator_loc: (2,0)-(2,1) = "."
│ ├── message_loc: (2,1)-(2,2) = "b"
│ ├── opening_loc: ∅
│ ├── arguments: ∅
│ ├── closing_loc: ∅
│ ├── block: ∅
│ ├── flags: ∅
│ └── name: "b"
├── call_operator_loc: (3,0)-(3,1) = "."
├── message_loc: (3,1)-(3,2) = "c"
├── opening_loc: ∅
├── arguments: ∅
├── closing_loc: ∅
├── block: ∅
├── flags: ∅
└── name: "c"
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