@ ProgramNode (location: (1,0)-(1,14))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,14))
    └── body: (length: 1)
        └── @ CallNode (location: (1,0)-(1,14))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (1,0)-(1,1) = "a"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (1,2)-(1,14))
            │   └── arguments: (length: 1)
            │       └── @ ParenthesesNode (location: (1,2)-(1,14))
            │           ├── body:
            │           │   @ StatementsNode (location: (1,3)-(1,13))
            │           │   └── body: (length: 1)
            │           │       └── @ RescueModifierNode (location: (1,3)-(1,13))
            │           │           ├── expression:
            │           │           │   @ CallNode (location: (1,3)-(1,4))
            │           │           │   ├── receiver: ∅
            │           │           │   ├── call_operator_loc: ∅
            │           │           │   ├── message_loc: (1,3)-(1,4) = "b"
            │           │           │   ├── opening_loc: ∅
            │           │           │   ├── arguments: ∅
            │           │           │   ├── closing_loc: ∅
            │           │           │   ├── block: ∅
            │           │           │   ├── flags: variable_call
            │           │           │   └── name: "b"
            │           │           ├── keyword_loc: (1,5)-(1,11) = "rescue"
            │           │           └── rescue_expression:
            │           │               @ CallNode (location: (1,12)-(1,13))
            │           │               ├── receiver: ∅
            │           │               ├── call_operator_loc: ∅
            │           │               ├── message_loc: (1,12)-(1,13) = "c"
            │           │               ├── opening_loc: ∅
            │           │               ├── arguments: ∅
            │           │               ├── closing_loc: ∅
            │           │               ├── block: ∅
            │           │               ├── flags: variable_call
            │           │               └── name: "c"
            │           ├── opening_loc: (1,2)-(1,3) = "("
            │           └── closing_loc: (1,13)-(1,14) = ")"
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: ∅
            └── name: "a"