@ ProgramNode (location: (1,0)-(3,9))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(3,9))
    ├── flags: ∅
    └── body: (length: 2)
        ├── @ IfNode (location: (1,0)-(1,9))
        │   ├── flags: newline
        │   ├── if_keyword_loc: ∅
        │   ├── predicate:
        │   │   @ CallNode (location: (1,0)-(1,1))
        │   │   ├── flags: variable_call, ignore_visibility
        │   │   ├── receiver: ∅
        │   │   ├── call_operator_loc: ∅
        │   │   ├── name: :a
        │   │   ├── message_loc: (1,0)-(1,1) = "a"
        │   │   ├── opening_loc: ∅
        │   │   ├── arguments: ∅
        │   │   ├── closing_loc: ∅
        │   │   └── block: ∅
        │   ├── then_keyword_loc: (1,2)-(1,3) = "?"
        │   ├── statements:
        │   │   @ StatementsNode (location: (1,4)-(1,6))
        │   │   ├── flags: ∅
        │   │   └── body: (length: 1)
        │   │       └── @ StringNode (location: (1,4)-(1,6))
        │   │           ├── flags: newline
        │   │           ├── opening_loc: (1,4)-(1,5) = "\""
        │   │           ├── content_loc: (1,5)-(1,5) = ""
        │   │           ├── closing_loc: (1,5)-(1,6) = "\""
        │   │           └── unescaped: ""
        │   ├── subsequent:
        │   │   @ ElseNode (location: (1,6)-(1,9))
        │   │   ├── flags: ∅
        │   │   ├── else_keyword_loc: (1,6)-(1,7) = ":"
        │   │   ├── statements:
        │   │   │   @ StatementsNode (location: (1,8)-(1,9))
        │   │   │   ├── flags: ∅
        │   │   │   └── body: (length: 1)
        │   │   │       └── @ CallNode (location: (1,8)-(1,9))
        │   │   │           ├── flags: newline, variable_call, ignore_visibility
        │   │   │           ├── receiver: ∅
        │   │   │           ├── call_operator_loc: ∅
        │   │   │           ├── name: :b
        │   │   │           ├── message_loc: (1,8)-(1,9) = "b"
        │   │   │           ├── opening_loc: ∅
        │   │   │           ├── arguments: ∅
        │   │   │           ├── closing_loc: ∅
        │   │   │           └── block: ∅
        │   │   └── end_keyword_loc: ∅
        │   └── end_keyword_loc: ∅
        └── @ IfNode (location: (3,0)-(3,9))
            ├── flags: newline
            ├── if_keyword_loc: ∅
            ├── predicate:
            │   @ CallNode (location: (3,0)-(3,1))
            │   ├── flags: variable_call, ignore_visibility
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── name: :a
            │   ├── message_loc: (3,0)-(3,1) = "a"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   └── block: ∅
            ├── then_keyword_loc: (3,2)-(3,3) = "?"
            ├── statements:
            │   @ StatementsNode (location: (3,4)-(3,6))
            │   ├── flags: ∅
            │   └── body: (length: 1)
            │       └── @ StringNode (location: (3,4)-(3,6))
            │           ├── flags: newline
            │           ├── opening_loc: (3,4)-(3,5) = "'"
            │           ├── content_loc: (3,5)-(3,5) = ""
            │           ├── closing_loc: (3,5)-(3,6) = "'"
            │           └── unescaped: ""
            ├── subsequent:
            │   @ ElseNode (location: (3,6)-(3,9))
            │   ├── flags: ∅
            │   ├── else_keyword_loc: (3,6)-(3,7) = ":"
            │   ├── statements:
            │   │   @ StatementsNode (location: (3,8)-(3,9))
            │   │   ├── flags: ∅
            │   │   └── body: (length: 1)
            │   │       └── @ CallNode (location: (3,8)-(3,9))
            │   │           ├── flags: newline, variable_call, ignore_visibility
            │   │           ├── receiver: ∅
            │   │           ├── call_operator_loc: ∅
            │   │           ├── name: :b
            │   │           ├── message_loc: (3,8)-(3,9) = "b"
            │   │           ├── opening_loc: ∅
            │   │           ├── arguments: ∅
            │   │           ├── closing_loc: ∅
            │   │           └── block: ∅
            │   └── end_keyword_loc: ∅
            └── end_keyword_loc: ∅
