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@ ProgramNode (location: (1,0)-(1,23))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(1,23))
└── body: (length: 1)
└── @ DefNode (location: (1,0)-(1,23))
├── name: :foo
├── name_loc: (1,4)-(1,7) = "foo"
├── receiver: ∅
├── parameters:
│ @ ParametersNode (location: (1,8)-(1,9))
│ ├── requireds: (length: 0)
│ ├── optionals: (length: 0)
│ ├── rest: ∅
│ ├── posts: (length: 0)
│ ├── keywords: (length: 0)
│ ├── keyword_rest: ∅
│ └── block:
│ @ BlockParameterNode (location: (1,8)-(1,9))
│ ├── flags: ∅
│ ├── name: ∅
│ ├── name_loc: ∅
│ └── operator_loc: (1,8)-(1,9) = "&"
├── body:
│ @ StatementsNode (location: (1,12)-(1,17))
│ └── body: (length: 1)
│ └── @ CallNode (location: (1,12)-(1,17))
│ ├── flags: ignore_visibility
│ ├── receiver: ∅
│ ├── call_operator_loc: ∅
│ ├── name: :bar
│ ├── message_loc: (1,12)-(1,15) = "bar"
│ ├── opening_loc: (1,15)-(1,16) = "("
│ ├── arguments: ∅
│ ├── closing_loc: (1,17)-(1,18) = ")"
│ └── block:
│ @ BlockArgumentNode (location: (1,16)-(1,17))
│ ├── expression: ∅
│ └── operator_loc: (1,16)-(1,17) = "&"
├── locals: []
├── def_keyword_loc: (1,0)-(1,3) = "def"
├── operator_loc: ∅
├── lparen_loc: (1,7)-(1,8) = "("
├── rparen_loc: (1,9)-(1,10) = ")"
├── equal_loc: ∅
└── end_keyword_loc: (1,20)-(1,23) = "end"
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