@ ProgramNode (location: (1,0)-(8,3))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(8,3))
    └── body: (length: 1)
        └── @ CallNode (location: (1,0)-(8,3))
            ├── flags: ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :a
            ├── message_loc: (1,0)-(1,1) = "a"
            ├── opening_loc: ∅
            ├── arguments: ∅
            ├── closing_loc: ∅
            └── block:
                @ BlockNode (location: (1,2)-(8,3))
                ├── locals: [:v]
                ├── parameters: ∅
                ├── body:
                │   @ StatementsNode (location: (2,2)-(7,5))
                │   └── body: (length: 2)
                │       ├── @ LocalVariableWriteNode (location: (2,2)-(2,9))
                │       │   ├── name: :v
                │       │   ├── depth: 0
                │       │   ├── name_loc: (2,2)-(2,3) = "v"
                │       │   ├── value:
                │       │   │   @ NilNode (location: (2,6)-(2,9))
                │       │   └── operator_loc: (2,4)-(2,5) = "="
                │       └── @ BeginNode (location: (3,2)-(7,5))
                │           ├── begin_keyword_loc: (3,2)-(3,7) = "begin"
                │           ├── statements:
                │           │   @ StatementsNode (location: (4,4)-(4,9))
                │           │   └── body: (length: 1)
                │           │       └── @ YieldNode (location: (4,4)-(4,9))
                │           │           ├── keyword_loc: (4,4)-(4,9) = "yield"
                │           │           ├── lparen_loc: ∅
                │           │           ├── arguments: ∅
                │           │           └── rparen_loc: ∅
                │           ├── rescue_clause:
                │           │   @ RescueNode (location: (5,2)-(6,9))
                │           │   ├── keyword_loc: (5,2)-(5,8) = "rescue"
                │           │   ├── exceptions: (length: 1)
                │           │   │   └── @ ConstantReadNode (location: (5,9)-(5,18))
                │           │   │       └── name: :Exception
                │           │   ├── operator_loc: (5,19)-(5,21) = "=>"
                │           │   ├── reference:
                │           │   │   @ LocalVariableTargetNode (location: (5,22)-(5,23))
                │           │   │   ├── name: :v
                │           │   │   └── depth: 0
                │           │   ├── statements:
                │           │   │   @ StatementsNode (location: (6,4)-(6,9))
                │           │   │   └── body: (length: 1)
                │           │   │       └── @ BreakNode (location: (6,4)-(6,9))
                │           │   │           ├── arguments: ∅
                │           │   │           └── keyword_loc: (6,4)-(6,9) = "break"
                │           │   └── consequent: ∅
                │           ├── else_clause: ∅
                │           ├── ensure_clause: ∅
                │           └── end_keyword_loc: (7,2)-(7,5) = "end"
                ├── opening_loc: (1,2)-(1,4) = "do"
                └── closing_loc: (8,0)-(8,3) = "end"