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@ ProgramNode (location: (1,0)-(2,3))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(2,3))
└── body: (length: 1)
└── @ IfNode (location: (1,0)-(2,3))
├── if_keyword_loc: (1,0)-(1,2) = "if"
├── predicate:
│ @ CallNode (location: (1,3)-(1,15))
│ ├── flags: ∅
│ ├── receiver:
│ │ @ CallNode (location: (1,7)-(1,15))
│ │ ├── flags: ∅
│ │ ├── receiver:
│ │ │ @ CallNode (location: (1,7)-(1,10))
│ │ │ ├── flags: variable_call, ignore_visibility
│ │ │ ├── receiver: ∅
│ │ │ ├── call_operator_loc: ∅
│ │ │ ├── name: :var
│ │ │ ├── message_loc: (1,7)-(1,10) = "var"
│ │ │ ├── opening_loc: ∅
│ │ │ ├── arguments: ∅
│ │ │ ├── closing_loc: ∅
│ │ │ └── block: ∅
│ │ ├── call_operator_loc: (1,10)-(1,11) = "."
│ │ ├── name: :nil?
│ │ ├── message_loc: (1,11)-(1,15) = "nil?"
│ │ ├── opening_loc: ∅
│ │ ├── arguments: ∅
│ │ ├── closing_loc: ∅
│ │ └── block: ∅
│ ├── call_operator_loc: ∅
│ ├── name: :!
│ ├── message_loc: (1,3)-(1,6) = "not"
│ ├── opening_loc: ∅
│ ├── arguments: ∅
│ ├── closing_loc: ∅
│ └── block: ∅
├── then_keyword_loc: (1,16)-(1,20) = "then"
├── statements:
│ @ StatementsNode (location: (1,21)-(1,26))
│ └── body: (length: 1)
│ └── @ StringNode (location: (1,21)-(1,26))
│ ├── flags: ∅
│ ├── opening_loc: (1,21)-(1,22) = "'"
│ ├── content_loc: (1,22)-(1,25) = "foo"
│ ├── closing_loc: (1,25)-(1,26) = "'"
│ └── unescaped: "foo"
├── consequent:
│ @ ElseNode (location: (1,27)-(2,3))
│ ├── else_keyword_loc: (1,27)-(1,31) = "else"
│ ├── statements:
│ │ @ StatementsNode (location: (1,32)-(1,37))
│ │ └── body: (length: 1)
│ │ └── @ StringNode (location: (1,32)-(1,37))
│ │ ├── flags: ∅
│ │ ├── opening_loc: (1,32)-(1,33) = "'"
│ │ ├── content_loc: (1,33)-(1,36) = "bar"
│ │ ├── closing_loc: (1,36)-(1,37) = "'"
│ │ └── unescaped: "bar"
│ └── end_keyword_loc: (2,0)-(2,3) = "end"
└── end_keyword_loc: (2,0)-(2,3) = "end"
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