@ ProgramNode (location: (0...19))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...19))
    └── body: (length: 2)
        ├── @ LambdaNode (location: (0...12))
        │   ├── locals: [:scope]
        │   ├── operator_loc: (0...2) = "->"
        │   ├── opening_loc: (10...11) = "{"
        │   ├── closing_loc: (11...12) = "}"
        │   ├── parameters:
        │   │   @ BlockParametersNode (location: (2...9))
        │   │   ├── parameters:
        │   │   │   @ ParametersNode (location: (3...8))
        │   │   │   ├── requireds: (length: 1)
        │   │   │   │   └── @ RequiredParameterNode (location: (3...8))
        │   │   │   │       └── name: :scope
        │   │   │   ├── optionals: (length: 0)
        │   │   │   ├── rest: ∅
        │   │   │   ├── posts: (length: 0)
        │   │   │   ├── keywords: (length: 0)
        │   │   │   ├── keyword_rest: ∅
        │   │   │   └── block: ∅
        │   │   ├── locals: (length: 0)
        │   │   ├── opening_loc: (2...3) = "("
        │   │   └── closing_loc: (8...9) = ")"
        │   └── body: ∅
        └── @ CallNode (location: (14...19))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (14...19) = "scope"
            ├── opening_loc: ∅
            ├── arguments: ∅
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: variable_call
            └── name: "scope"
