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@ ProgramNode (location: (1,0)-(2,1))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(2,1))
└── body: (length: 1)
└── @ CallNode (location: (1,0)-(2,1))
├── receiver:
│ @ CallNode (location: (1,0)-(1,4))
│ ├── receiver: ∅
│ ├── call_operator_loc: ∅
│ ├── message_loc: (1,0)-(1,4) = "_buf"
│ ├── opening_loc: ∅
│ ├── arguments: ∅
│ ├── closing_loc: ∅
│ ├── block: ∅
│ ├── flags: variable_call
│ └── name: "_buf"
├── call_operator_loc: ∅
├── message_loc: (1,5)-(1,7) = "<<"
├── opening_loc: ∅
├── arguments:
│ @ ArgumentsNode (location: (1,8)-(2,1))
│ └── arguments: (length: 1)
│ └── @ StringNode (location: (1,8)-(2,1))
│ ├── flags: ∅
│ ├── opening_loc: (1,8)-(1,9) = "'"
│ ├── content_loc: (1,9)-(1,0) = ":\n"
│ ├── closing_loc: (2,0)-(2,1) = "'"
│ └── unescaped: ":\n"
├── closing_loc: ∅
├── block: ∅
├── flags: ∅
└── name: "<<"
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