@ ProgramNode (location: (1,0)-(1,38))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,38))
    └── body: (length: 1)
        └── @ IfNode (location: (1,0)-(1,38))
            ├── if_keyword_loc: (1,0)-(1,2) = "if"
            ├── predicate:
            │   @ CallNode (location: (1,3)-(1,6))
            │   ├── flags: variable_call
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── name: :foo
            │   ├── message_loc: (1,3)-(1,6) = "foo"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   └── block: ∅
            ├── then_keyword_loc: ∅
            ├── statements:
            │   @ StatementsNode (location: (1,8)-(1,11))
            │   └── body: (length: 1)
            │       └── @ CallNode (location: (1,8)-(1,11))
            │           ├── flags: variable_call
            │           ├── receiver: ∅
            │           ├── call_operator_loc: ∅
            │           ├── name: :bar
            │           ├── message_loc: (1,8)-(1,11) = "bar"
            │           ├── opening_loc: ∅
            │           ├── arguments: ∅
            │           ├── closing_loc: ∅
            │           └── block: ∅
            ├── consequent:
            │   @ IfNode (location: (1,13)-(1,38))
            │   ├── if_keyword_loc: (1,13)-(1,18) = "elsif"
            │   ├── predicate:
            │   │   @ CallNode (location: (1,19)-(1,22))
            │   │   ├── flags: variable_call
            │   │   ├── receiver: ∅
            │   │   ├── call_operator_loc: ∅
            │   │   ├── name: :baz
            │   │   ├── message_loc: (1,19)-(1,22) = "baz"
            │   │   ├── opening_loc: ∅
            │   │   ├── arguments: ∅
            │   │   ├── closing_loc: ∅
            │   │   └── block: ∅
            │   ├── then_keyword_loc: ∅
            │   ├── statements:
            │   │   @ StatementsNode (location: (1,24)-(1,25))
            │   │   └── body: (length: 1)
            │   │       └── @ IntegerNode (location: (1,24)-(1,25))
            │   │           └── flags: decimal
            │   ├── consequent:
            │   │   @ ElseNode (location: (1,27)-(1,38))
            │   │   ├── else_keyword_loc: (1,27)-(1,31) = "else"
            │   │   ├── statements:
            │   │   │   @ StatementsNode (location: (1,32)-(1,33))
            │   │   │   └── body: (length: 1)
            │   │   │       └── @ IntegerNode (location: (1,32)-(1,33))
            │   │   │           └── flags: decimal
            │   │   └── end_keyword_loc: (1,35)-(1,38) = "end"
            │   └── end_keyword_loc: (1,35)-(1,38) = "end"
            └── end_keyword_loc: (1,35)-(1,38) = "end"
