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@ ProgramNode (location: (1,0)-(2,3))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(2,3))
└── body: (length: 1)
└── @ DefNode (location: (1,0)-(2,3))
├── name: :x
├── name_loc: (1,4)-(1,5) = "x"
├── receiver: ∅
├── parameters:
│ @ ParametersNode (location: (1,6)-(1,12))
│ ├── requireds: (length: 0)
│ ├── optionals: (length: 0)
│ ├── rest: ∅
│ ├── posts: (length: 0)
│ ├── keywords: (length: 2)
│ │ ├── @ RequiredKeywordParameterNode (location: (1,6)-(1,8))
│ │ │ ├── flags: ∅
│ │ │ ├── name: :a
│ │ │ └── name_loc: (1,6)-(1,8) = "a:"
│ │ └── @ RequiredKeywordParameterNode (location: (1,10)-(1,12))
│ │ ├── flags: ∅
│ │ ├── name: :b
│ │ └── name_loc: (1,10)-(1,12) = "b:"
│ ├── keyword_rest: ∅
│ └── block: ∅
├── body: ∅
├── locals: [:a, :b]
├── def_keyword_loc: (1,0)-(1,3) = "def"
├── operator_loc: ∅
├── lparen_loc: ∅
├── rparen_loc: ∅
├── equal_loc: ∅
└── end_keyword_loc: (2,0)-(2,3) = "end"
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