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@ ProgramNode (location: (1,0)-(1,23))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(1,23))
└── body: (length: 1)
└── @ WhileNode (location: (1,0)-(1,23))
├── flags: ∅
├── keyword_loc: (1,0)-(1,5) = "while"
├── closing_loc: (1,20)-(1,23) = "end"
├── predicate:
│ @ CallNode (location: (1,6)-(1,16))
│ ├── flags: ∅
│ ├── receiver:
│ │ @ ParenthesesNode (location: (1,10)-(1,16))
│ │ ├── body:
│ │ │ @ StatementsNode (location: (1,11)-(1,15))
│ │ │ └── body: (length: 1)
│ │ │ └── @ TrueNode (location: (1,11)-(1,15))
│ │ ├── opening_loc: (1,10)-(1,11) = "("
│ │ └── closing_loc: (1,15)-(1,16) = ")"
│ ├── call_operator_loc: ∅
│ ├── name: :!
│ ├── message_loc: (1,6)-(1,9) = "not"
│ ├── opening_loc: ∅
│ ├── arguments: ∅
│ ├── closing_loc: ∅
│ └── block: ∅
└── statements: ∅
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