@ ProgramNode (location: (0...14))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...14))
    └── body: (length: 1)
        └── @ InterpolatedStringNode (location: (0...14))
            ├── opening_loc: (0...1) = "\""
            ├── parts: (length: 1)
            │   └── @ EmbeddedStatementsNode (location: (1...13))
            │       ├── opening_loc: (1...3) = "\#{"
            │       ├── statements:
            │       │   @ StatementsNode (location: (3...12))
            │       │   └── body: (length: 1)
            │       │       └── @ LambdaNode (location: (3...12))
            │       │           ├── locals: [:foo]
            │       │           ├── operator_loc: (3...5) = "->"
            │       │           ├── opening_loc: (10...11) = "{"
            │       │           ├── closing_loc: (11...12) = "}"
            │       │           ├── parameters:
            │       │           │   @ BlockParametersNode (location: (6...9))
            │       │           │   ├── parameters:
            │       │           │   │   @ ParametersNode (location: (6...9))
            │       │           │   │   ├── requireds: (length: 1)
            │       │           │   │   │   └── @ RequiredParameterNode (location: (6...9))
            │       │           │   │   │       └── name: :foo
            │       │           │   │   ├── optionals: (length: 0)
            │       │           │   │   ├── rest: ∅
            │       │           │   │   ├── posts: (length: 0)
            │       │           │   │   ├── keywords: (length: 0)
            │       │           │   │   ├── keyword_rest: ∅
            │       │           │   │   └── block: ∅
            │       │           │   ├── locals: (length: 0)
            │       │           │   ├── opening_loc: ∅
            │       │           │   └── closing_loc: ∅
            │       │           └── body: ∅
            │       └── closing_loc: (12...13) = "}"
            └── closing_loc: (13...14) = "\""
