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@ ProgramNode (location: (1,0)-(2,1))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(2,1))
└── body: (length: 1)
└── @ CallOrWriteNode (location: (1,0)-(2,1))
├── 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: (1,1)-(1,3) = "&."
├── message_loc: (1,3)-(1,4) = "b"
├── opening_loc: ∅
├── arguments: ∅
├── closing_loc: ∅
├── flags: safe_navigation
├── read_name: "b"
├── write_name: "b="
├── operator_loc: (1,5)-(1,8) = "||="
└── value:
@ CallNode (location: (2,0)-(2,1))
├── receiver: ∅
├── call_operator_loc: ∅
├── message_loc: (2,0)-(2,1) = "x"
├── opening_loc: ∅
├── arguments: ∅
├── closing_loc: ∅
├── block: ∅
├── flags: variable_call
└── name: "x"
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