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