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@ ProgramNode (location: (1,0)-(1,18))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(1,18))
└── body: (length: 1)
└── @ DefNode (location: (1,0)-(1,18))
├── name: :f
├── name_loc: (1,4)-(1,5) = "f"
├── receiver: ∅
├── parameters:
│ @ ParametersNode (location: (1,6)-(1,12))
│ ├── requireds: (length: 0)
│ ├── optionals: (length: 0)
│ ├── rest: ∅
│ ├── posts: (length: 0)
│ ├── keywords: (length: 0)
│ ├── keyword_rest: ∅
│ └── block:
│ @ BlockParameterNode (location: (1,6)-(1,12))
│ ├── flags: ∅
│ ├── name: :block
│ ├── name_loc: (1,7)-(1,12) = "block"
│ └── operator_loc: (1,6)-(1,7) = "&"
├── body: ∅
├── locals: [:block]
├── def_keyword_loc: (1,0)-(1,3) = "def"
├── operator_loc: ∅
├── lparen_loc: (1,5)-(1,6) = "("
├── rparen_loc: (1,12)-(1,13) = ")"
├── equal_loc: ∅
└── end_keyword_loc: (1,15)-(1,18) = "end"
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