@ ProgramNode (location: (1,0)-(5,3))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(5,3))
    └── body: (length: 1)
        └── @ CallNode (location: (1,0)-(5,3))
            ├── flags: ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :tap
            ├── message_loc: (1,0)-(1,3) = "tap"
            ├── opening_loc: ∅
            ├── arguments: ∅
            ├── closing_loc: ∅
            └── block:
                @ BlockNode (location: (1,4)-(5,3))
                ├── locals: []
                ├── parameters: ∅
                ├── body:
                │   @ BeginNode (location: (1,4)-(5,3))
                │   ├── begin_keyword_loc: ∅
                │   ├── statements:
                │   │   @ StatementsNode (location: (2,2)-(2,7))
                │   │   └── body: (length: 1)
                │   │       └── @ CallNode (location: (2,2)-(2,7))
                │   │           ├── flags: variable_call, ignore_visibility
                │   │           ├── receiver: ∅
                │   │           ├── call_operator_loc: ∅
                │   │           ├── name: :raise
                │   │           ├── message_loc: (2,2)-(2,7) = "raise"
                │   │           ├── opening_loc: ∅
                │   │           ├── arguments: ∅
                │   │           ├── closing_loc: ∅
                │   │           └── block: ∅
                │   ├── rescue_clause: ∅
                │   ├── else_clause: ∅
                │   ├── ensure_clause:
                │   │   @ EnsureNode (location: (3,0)-(5,3))
                │   │   ├── ensure_keyword_loc: (3,0)-(3,6) = "ensure"
                │   │   ├── statements:
                │   │   │   @ StatementsNode (location: (4,2)-(4,9))
                │   │   │   └── body: (length: 1)
                │   │   │       └── @ SymbolNode (location: (4,2)-(4,9))
                │   │   │           ├── flags: forced_us_ascii_encoding
                │   │   │           ├── opening_loc: (4,2)-(4,3) = ":"
                │   │   │           ├── value_loc: (4,3)-(4,9) = "ensure"
                │   │   │           ├── closing_loc: ∅
                │   │   │           └── unescaped: "ensure"
                │   │   └── end_keyword_loc: (5,0)-(5,3) = "end"
                │   └── end_keyword_loc: (5,0)-(5,3) = "end"
                ├── opening_loc: (1,4)-(1,6) = "do"
                └── closing_loc: (5,0)-(5,3) = "end"