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