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@ ProgramNode (location: (1,0)-(1,12))
├── locals: [:foo]
└── statements:
@ StatementsNode (location: (1,0)-(1,12))
└── body: (length: 1)
└── @ LocalVariableOperatorWriteNode (location: (1,0)-(1,12))
├── name_loc: (1,0)-(1,3) = "foo"
├── operator_loc: (1,4)-(1,6) = "+="
├── value:
│ @ CallNode (location: (1,7)-(1,12))
│ ├── receiver: ∅
│ ├── call_operator_loc: ∅
│ ├── message_loc: (1,7)-(1,8) = "m"
│ ├── opening_loc: ∅
│ ├── arguments:
│ │ @ ArgumentsNode (location: (1,9)-(1,12))
│ │ └── arguments: (length: 1)
│ │ └── @ LocalVariableReadNode (location: (1,9)-(1,12))
│ │ ├── name: :foo
│ │ └── depth: 0
│ ├── closing_loc: ∅
│ ├── block: ∅
│ ├── flags: ∅
│ └── name: "m"
├── name: :foo
├── operator: :+
└── depth: 0
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