@ ProgramNode (location: (1,0)-(1,13))
├── locals: [:t]
└── statements:
    @ StatementsNode (location: (1,0)-(1,13))
    └── body: (length: 2)
        ├── @ LocalVariableWriteNode (location: (1,0)-(1,3))
        │   ├── name: :t
        │   ├── depth: 0
        │   ├── name_loc: (1,0)-(1,1) = "t"
        │   ├── value:
        │   │   @ IntegerNode (location: (1,2)-(1,3))
        │   │   └── flags: decimal
        │   └── operator_loc: (1,1)-(1,2) = "="
        └── @ IfNode (location: (1,4)-(1,13))
            ├── if_keyword_loc: ∅
            ├── predicate:
            │   @ ParenthesesNode (location: (1,4)-(1,9))
            │   ├── body:
            │   │   @ StatementsNode (location: (1,5)-(1,8))
            │   │   └── body: (length: 1)
            │   │       └── @ CallNode (location: (1,5)-(1,8))
            │   │           ├── flags: variable_call
            │   │           ├── receiver: ∅
            │   │           ├── call_operator_loc: ∅
            │   │           ├── name: :foo
            │   │           ├── message_loc: (1,5)-(1,8) = "foo"
            │   │           ├── opening_loc: ∅
            │   │           ├── arguments: ∅
            │   │           ├── closing_loc: ∅
            │   │           └── block: ∅
            │   ├── opening_loc: (1,4)-(1,5) = "("
            │   └── closing_loc: (1,8)-(1,9) = ")"
            ├── then_keyword_loc: (1,9)-(1,10) = "?"
            ├── statements:
            │   @ StatementsNode (location: (1,10)-(1,11))
            │   └── body: (length: 1)
            │       └── @ LocalVariableReadNode (location: (1,10)-(1,11))
            │           ├── name: :t
            │           └── depth: 0
            ├── consequent:
            │   @ ElseNode (location: (1,11)-(1,13))
            │   ├── else_keyword_loc: (1,11)-(1,12) = ":"
            │   ├── statements:
            │   │   @ StatementsNode (location: (1,12)-(1,13))
            │   │   └── body: (length: 1)
            │   │       └── @ ConstantReadNode (location: (1,12)-(1,13))
            │   │           └── name: :T
            │   └── end_keyword_loc: ∅
            └── end_keyword_loc: ∅
