@ ProgramNode (location: (0...24))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...24))
    └── body: (length: 1)
        └── @ CallNode (location: (0...24))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (0...1) = "a"
            ├── opening_loc: (1...2) = "("
            ├── arguments:
            │   @ ArgumentsNode (location: (2...23))
            │   └── arguments: (length: 1)
            │       └── @ KeywordHashNode (location: (2...23))
            │           └── elements: (length: 1)
            │               └── @ AssocNode (location: (2...23))
            │                   ├── key:
            │                   │   @ SymbolNode (location: (2...4))
            │                   │   ├── opening_loc: ∅
            │                   │   ├── value_loc: (2...3) = "b"
            │                   │   ├── closing_loc: (3...4) = ":"
            │                   │   └── unescaped: "b"
            │                   ├── value:
            │                   │   @ IfNode (location: (5...23))
            │                   │   ├── if_keyword_loc: (5...7) = "if"
            │                   │   ├── predicate:
            │                   │   │   @ SymbolNode (location: (8...10))
            │                   │   │   ├── opening_loc: (8...9) = ":"
            │                   │   │   ├── value_loc: (9...10) = "c"
            │                   │   │   ├── closing_loc: ∅
            │                   │   │   └── unescaped: "c"
            │                   │   ├── statements:
            │                   │   │   @ StatementsNode (location: (11...12))
            │                   │   │   └── body: (length: 1)
            │                   │   │       └── @ IntegerNode (location: (11...12))
            │                   │   │           └── flags: decimal
            │                   │   ├── consequent:
            │                   │   │   @ ElseNode (location: (13...23))
            │                   │   │   ├── else_keyword_loc: (13...17) = "else"
            │                   │   │   ├── statements:
            │                   │   │   │   @ StatementsNode (location: (18...19))
            │                   │   │   │   └── body: (length: 1)
            │                   │   │   │       └── @ IntegerNode (location: (18...19))
            │                   │   │   │           └── flags: decimal
            │                   │   │   └── end_keyword_loc: (20...23) = "end"
            │                   │   └── end_keyword_loc: (20...23) = "end"
            │                   └── operator_loc: ∅
            ├── closing_loc: (23...24) = ")"
            ├── block: ∅
            ├── flags: ∅
            └── name: "a"
