@ ProgramNode (location: (1,0)-(5,22))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(5,22))
    └── body: (length: 3)
        ├── @ CallNode (location: (1,0)-(1,12))
        │   ├── flags: ignore_visibility
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :f
        │   ├── message_loc: (1,0)-(1,1) = "f"
        │   ├── opening_loc: (1,1)-(1,2) = "("
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (1,2)-(1,11))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ IfNode (location: (1,2)-(1,11))
        │   │           ├── if_keyword_loc: ∅
        │   │           ├── predicate:
        │   │           │   @ CallNode (location: (1,2)-(1,3))
        │   │           │   ├── flags: variable_call, ignore_visibility
        │   │           │   ├── receiver: ∅
        │   │           │   ├── call_operator_loc: ∅
        │   │           │   ├── name: :a
        │   │           │   ├── message_loc: (1,2)-(1,3) = "a"
        │   │           │   ├── opening_loc: ∅
        │   │           │   ├── arguments: ∅
        │   │           │   ├── closing_loc: ∅
        │   │           │   └── block: ∅
        │   │           ├── then_keyword_loc: (1,4)-(1,5) = "?"
        │   │           ├── statements:
        │   │           │   @ StatementsNode (location: (1,6)-(1,9))
        │   │           │   └── body: (length: 1)
        │   │           │       └── @ StringNode (location: (1,6)-(1,9))
        │   │           │           ├── flags: ∅
        │   │           │           ├── opening_loc: (1,6)-(1,7) = "\""
        │   │           │           ├── content_loc: (1,7)-(1,8) = "a"
        │   │           │           ├── closing_loc: (1,8)-(1,9) = "\""
        │   │           │           └── unescaped: "a"
        │   │           ├── consequent:
        │   │           │   @ ElseNode (location: (1,9)-(1,11))
        │   │           │   ├── else_keyword_loc: (1,9)-(1,10) = ":"
        │   │           │   ├── statements:
        │   │           │   │   @ StatementsNode (location: (1,10)-(1,11))
        │   │           │   │   └── body: (length: 1)
        │   │           │   │       └── @ IntegerNode (location: (1,10)-(1,11))
        │   │           │   │           ├── flags: decimal
        │   │           │   │           └── value: 1
        │   │           │   └── end_keyword_loc: ∅
        │   │           └── end_keyword_loc: ∅
        │   ├── closing_loc: (1,11)-(1,12) = ")"
        │   └── block: ∅
        ├── @ HashNode (location: (3,0)-(3,12))
        │   ├── opening_loc: (3,0)-(3,1) = "{"
        │   ├── elements: (length: 1)
        │   │   └── @ AssocNode (location: (3,2)-(3,10))
        │   │       ├── key:
        │   │       │   @ SymbolNode (location: (3,2)-(3,8))
        │   │       │   ├── flags: forced_us_ascii_encoding
        │   │       │   ├── opening_loc: (3,2)-(3,3) = "'"
        │   │       │   ├── value_loc: (3,3)-(3,6) = "foo"
        │   │       │   ├── closing_loc: (3,6)-(3,8) = "':"
        │   │       │   └── unescaped: "foo"
        │   │       ├── value:
        │   │       │   @ IntegerNode (location: (3,9)-(3,10))
        │   │       │   ├── flags: decimal
        │   │       │   └── value: 2
        │   │       └── operator_loc: ∅
        │   └── closing_loc: (3,11)-(3,12) = "}"
        └── @ HashNode (location: (5,0)-(5,22))
            ├── opening_loc: (5,0)-(5,1) = "{"
            ├── elements: (length: 2)
            │   ├── @ AssocNode (location: (5,2)-(5,10))
            │   │   ├── key:
            │   │   │   @ SymbolNode (location: (5,2)-(5,8))
            │   │   │   ├── flags: forced_us_ascii_encoding
            │   │   │   ├── opening_loc: (5,2)-(5,3) = "'"
            │   │   │   ├── value_loc: (5,3)-(5,6) = "foo"
            │   │   │   ├── closing_loc: (5,6)-(5,8) = "':"
            │   │   │   └── unescaped: "foo"
            │   │   ├── value:
            │   │   │   @ IntegerNode (location: (5,9)-(5,10))
            │   │   │   ├── flags: decimal
            │   │   │   └── value: 2
            │   │   └── operator_loc: ∅
            │   └── @ AssocNode (location: (5,12)-(5,21))
            │       ├── key:
            │       │   @ SymbolNode (location: (5,12)-(5,18))
            │       │   ├── flags: forced_us_ascii_encoding
            │       │   ├── opening_loc: (5,12)-(5,13) = "'"
            │       │   ├── value_loc: (5,13)-(5,16) = "bar"
            │       │   ├── closing_loc: (5,16)-(5,18) = "':"
            │       │   └── unescaped: "bar"
            │       ├── value:
            │       │   @ HashNode (location: (5,19)-(5,21))
            │       │   ├── opening_loc: (5,19)-(5,20) = "{"
            │       │   ├── elements: (length: 0)
            │       │   └── closing_loc: (5,20)-(5,21) = "}"
            │       └── operator_loc: ∅
            └── closing_loc: (5,21)-(5,22) = "}"