@ ProgramNode (location: (1,0)-(1,5))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,5))
    └── body: (length: 1)
        └── @ LambdaNode (location: (1,0)-(1,5))
            ├── locals: []
            ├── operator_loc: (1,0)-(1,2) = "->"
            ├── opening_loc: (1,2)-(1,3) = "{"
            ├── closing_loc: (1,4)-(1,5) = "}"
            ├── parameters: ∅
            └── body: ∅