@ ProgramNode (location: (0...22))
├── locals: [:foo]
└── statements:
    @ StatementsNode (location: (0...22))
    └── body: (length: 1)
        └── @ LocalVariableOperatorWriteNode (location: (0...22))
            ├── name_loc: (0...3) = "foo"
            ├── operator_loc: (4...6) = "+="
            ├── value:
            │   @ RescueModifierNode (location: (7...22))
            │   ├── expression:
            │   │   @ CallNode (location: (7...11))
            │   │   ├── receiver: ∅
            │   │   ├── call_operator_loc: ∅
            │   │   ├── message_loc: (7...11) = "meth"
            │   │   ├── opening_loc: ∅
            │   │   ├── arguments: ∅
            │   │   ├── closing_loc: ∅
            │   │   ├── block: ∅
            │   │   ├── flags: variable_call
            │   │   └── name: "meth"
            │   ├── keyword_loc: (12...18) = "rescue"
            │   └── rescue_expression:
            │       @ CallNode (location: (19...22))
            │       ├── receiver: ∅
            │       ├── call_operator_loc: ∅
            │       ├── message_loc: (19...22) = "bar"
            │       ├── opening_loc: ∅
            │       ├── arguments: ∅
            │       ├── closing_loc: ∅
            │       ├── block: ∅
            │       ├── flags: variable_call
            │       └── name: "bar"
            ├── name: :foo
            ├── operator: :+
            └── depth: 0
