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