@ ProgramNode (location: (1,0)-(3,25))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(3,25))
    └── body: (length: 2)
        ├── @ HashNode (location: (1,0)-(1,10))
        │   ├── opening_loc: (1,0)-(1,1) = "{"
        │   ├── elements: (length: 1)
        │   │   └── @ AssocNode (location: (1,2)-(1,8))
        │   │       ├── key:
        │   │       │   @ IntegerNode (location: (1,2)-(1,3))
        │   │       │   ├── flags: decimal
        │   │       │   └── value: 1
        │   │       ├── value:
        │   │       │   @ IntegerNode (location: (1,7)-(1,8))
        │   │       │   ├── flags: decimal
        │   │       │   └── value: 2
        │   │       └── operator_loc: (1,4)-(1,6) = "=>"
        │   └── closing_loc: (1,9)-(1,10) = "}"
        └── @ HashNode (location: (3,0)-(3,25))
            ├── opening_loc: (3,0)-(3,1) = "{"
            ├── elements: (length: 2)
            │   ├── @ AssocNode (location: (3,2)-(3,8))
            │   │   ├── key:
            │   │   │   @ IntegerNode (location: (3,2)-(3,3))
            │   │   │   ├── flags: decimal
            │   │   │   └── value: 1
            │   │   ├── value:
            │   │   │   @ IntegerNode (location: (3,7)-(3,8))
            │   │   │   ├── flags: decimal
            │   │   │   └── value: 2
            │   │   └── operator_loc: (3,4)-(3,6) = "=>"
            │   └── @ AssocNode (location: (3,10)-(3,23))
            │       ├── key:
            │       │   @ SymbolNode (location: (3,10)-(3,14))
            │       │   ├── flags: forced_us_ascii_encoding
            │       │   ├── opening_loc: (3,10)-(3,11) = ":"
            │       │   ├── value_loc: (3,11)-(3,14) = "foo"
            │       │   ├── closing_loc: ∅
            │       │   └── unescaped: "foo"
            │       ├── value:
            │       │   @ StringNode (location: (3,18)-(3,23))
            │       │   ├── flags: ∅
            │       │   ├── opening_loc: (3,18)-(3,19) = "\""
            │       │   ├── content_loc: (3,19)-(3,22) = "bar"
            │       │   ├── closing_loc: (3,22)-(3,23) = "\""
            │       │   └── unescaped: "bar"
            │       └── operator_loc: (3,15)-(3,17) = "=>"
            └── closing_loc: (3,24)-(3,25) = "}"