@ ProgramNode (location: (1,0)-(9,3))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(9,3))
    └── body: (length: 1)
        └── @ BeginNode (location: (1,0)-(9,3))
            ├── begin_keyword_loc: (1,0)-(1,5) = "begin"
            ├── statements:
            │   @ StatementsNode (location: (2,2)-(2,3))
            │   └── body: (length: 1)
            │       └── @ IntegerNode (location: (2,2)-(2,3))
            │           ├── flags: decimal
            │           └── value: 1
            ├── rescue_clause:
            │   @ RescueNode (location: (3,0)-(4,3))
            │   ├── keyword_loc: (3,0)-(3,6) = "rescue"
            │   ├── exceptions: (length: 0)
            │   ├── operator_loc: ∅
            │   ├── reference: ∅
            │   ├── statements:
            │   │   @ StatementsNode (location: (4,2)-(4,3))
            │   │   └── body: (length: 1)
            │   │       └── @ IntegerNode (location: (4,2)-(4,3))
            │   │           ├── flags: decimal
            │   │           └── value: 2
            │   └── consequent: ∅
            ├── else_clause:
            │   @ ElseNode (location: (5,0)-(7,6))
            │   ├── else_keyword_loc: (5,0)-(5,4) = "else"
            │   ├── statements:
            │   │   @ StatementsNode (location: (6,2)-(6,3))
            │   │   └── body: (length: 1)
            │   │       └── @ IntegerNode (location: (6,2)-(6,3))
            │   │           ├── flags: decimal
            │   │           └── value: 3
            │   └── end_keyword_loc: (7,0)-(7,6) = "ensure"
            ├── ensure_clause:
            │   @ EnsureNode (location: (7,0)-(9,3))
            │   ├── ensure_keyword_loc: (7,0)-(7,6) = "ensure"
            │   ├── statements:
            │   │   @ StatementsNode (location: (8,2)-(8,3))
            │   │   └── body: (length: 1)
            │   │       └── @ IntegerNode (location: (8,2)-(8,3))
            │   │           ├── flags: decimal
            │   │           └── value: 4
            │   └── end_keyword_loc: (9,0)-(9,3) = "end"
            └── end_keyword_loc: (9,0)-(9,3) = "end"