@ ProgramNode (location: (0...17))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...17))
    └── body: (length: 1)
        └── @ HashNode (location: (0...17))
            ├── opening_loc: (0...1) = "{"
            ├── elements: (length: 2)
            │   ├── @ AssocNode (location: (2...8))
            │   │   ├── key:
            │   │   │   @ SymbolNode (location: (2...6))
            │   │   │   ├── opening_loc: ∅
            │   │   │   ├── value_loc: (2...5) = "foo"
            │   │   │   ├── closing_loc: (5...6) = ":"
            │   │   │   └── unescaped: "foo"
            │   │   ├── value:
            │   │   │   @ IntegerNode (location: (7...8))
            │   │   │   └── flags: decimal
            │   │   └── operator_loc: ∅
            │   └── @ AssocSplatNode (location: (10...15))
            │       ├── value:
            │       │   @ CallNode (location: (12...15))
            │       │   ├── receiver: ∅
            │       │   ├── call_operator_loc: ∅
            │       │   ├── message_loc: (12...15) = "bar"
            │       │   ├── opening_loc: ∅
            │       │   ├── arguments: ∅
            │       │   ├── closing_loc: ∅
            │       │   ├── block: ∅
            │       │   ├── flags: variable_call
            │       │   └── name: "bar"
            │       └── operator_loc: (10...12) = "**"
            └── closing_loc: (16...17) = "}"
