@ ProgramNode (location: (0...18))
├── locals: [:a, :b]
└── statements:
    @ StatementsNode (location: (0...18))
    └── body: (length: 1)
        └── @ MultiWriteNode (location: (0...18))
            ├── targets: (length: 2)
            │   ├── @ LocalVariableTargetNode (location: (0...1))
            │   │   ├── name: :a
            │   │   └── depth: 0
            │   └── @ LocalVariableTargetNode (location: (3...4))
            │       ├── name: :b
            │       └── depth: 0
            ├── lparen_loc: ∅
            ├── rparen_loc: ∅
            ├── operator_loc: (5...6) = "="
            └── value:
                @ RescueModifierNode (location: (7...18))
                ├── expression:
                │   @ CallNode (location: (7...8))
                │   ├── receiver: ∅
                │   ├── call_operator_loc: ∅
                │   ├── message_loc: (7...8) = "f"
                │   ├── opening_loc: ∅
                │   ├── arguments: ∅
                │   ├── closing_loc: ∅
                │   ├── block: ∅
                │   ├── flags: variable_call
                │   └── name: "f"
                ├── keyword_loc: (9...15) = "rescue"
                └── rescue_expression:
                    @ IntegerNode (location: (16...18))
                    └── flags: decimal
