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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: :f
├── name_loc: (1,4)-(1,5) = "f"
├── receiver: ∅
├── parameters:
│ @ ParametersNode (location: (1,6)-(1,18))
│ ├── requireds: (length: 1)
│ │ └── @ RequiredParameterNode (location: (1,6)-(1,7))
│ │ ├── flags: ∅
│ │ └── name: :a
│ ├── optionals: (length: 1)
│ │ └── @ OptionalParameterNode (location: (1,9)-(1,15))
│ │ ├── flags: ∅
│ │ ├── name: :b
│ │ ├── name_loc: (1,9)-(1,10) = "b"
│ │ ├── operator_loc: (1,11)-(1,12) = "="
│ │ └── value:
│ │ @ SymbolNode (location: (1,13)-(1,15))
│ │ ├── flags: forced_us_ascii_encoding
│ │ ├── opening_loc: (1,13)-(1,14) = ":"
│ │ ├── value_loc: (1,14)-(1,15) = "c"
│ │ ├── closing_loc: ∅
│ │ └── unescaped: "c"
│ ├── rest: ∅
│ ├── posts: (length: 1)
│ │ └── @ RequiredParameterNode (location: (1,17)-(1,18))
│ │ ├── flags: ∅
│ │ └── name: :d
│ ├── keywords: (length: 0)
│ ├── keyword_rest: ∅
│ └── block: ∅
├── body: ∅
├── locals: [:a, :b, :d]
├── def_keyword_loc: (1,0)-(1,3) = "def"
├── operator_loc: ∅
├── lparen_loc: (1,5)-(1,6) = "("
├── rparen_loc: (1,18)-(1,19) = ")"
├── equal_loc: ∅
└── end_keyword_loc: (1,20)-(1,23) = "end"
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