@ ProgramNode (location: (0...13))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...13))
    └── body: (length: 1)
        └── @ HashNode (location: (0...13))
            ├── opening_loc: (0...1) = "{"
            ├── elements: (length: 1)
            │   └── @ AssocNode (location: (2...10))
            │       ├── key:
            │       │   @ SymbolNode (location: (2...5))
            │       │   ├── opening_loc: (2...3) = ":"
            │       │   ├── value_loc: (3...5) = "s1"
            │       │   ├── closing_loc: ∅
            │       │   └── unescaped: "s1"
            │       ├── value:
            │       │   @ IntegerNode (location: (9...10))
            │       │   └── flags: decimal
            │       └── operator_loc: (6...8) = "=>"
            └── closing_loc: (12...13) = "}"
