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@ ProgramNode (location: (1,0)-(1,7))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(1,7))
└── body: (length: 1)
└── @ CallNode (location: (1,0)-(1,7))
├── receiver:
│ @ CallNode (location: (1,2)-(1,7))
│ ├── receiver:
│ │ @ CallNode (location: (1,2)-(1,3))
│ │ ├── receiver: ∅
│ │ ├── call_operator_loc: ∅
│ │ ├── message_loc: (1,2)-(1,3) = "a"
│ │ ├── opening_loc: ∅
│ │ ├── arguments: ∅
│ │ ├── closing_loc: ∅
│ │ ├── block: ∅
│ │ ├── flags: variable_call
│ │ └── name: :a
│ ├── call_operator_loc: (1,3)-(1,4) = "."
│ ├── message_loc: (1,4)-(1,5) = "b"
│ ├── opening_loc: ∅
│ ├── arguments:
│ │ @ ArgumentsNode (location: (1,6)-(1,7))
│ │ ├── arguments: (length: 1)
│ │ │ └── @ IntegerNode (location: (1,6)-(1,7))
│ │ │ └── flags: decimal
│ │ └── flags: ∅
│ ├── closing_loc: ∅
│ ├── block: ∅
│ ├── flags: ∅
│ └── name: :b
├── call_operator_loc: ∅
├── message_loc: (1,0)-(1,1) = "!"
├── opening_loc: ∅
├── arguments: ∅
├── closing_loc: ∅
├── block: ∅
├── flags: ∅
└── name: :!
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