@ ProgramNode (location: (1,0)-(1,16))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,16))
    ├── flags: ∅
    └── body: (length: 1)
        └── @ BeginNode (location: (1,0)-(1,16))
            ├── flags: newline
            ├── begin_keyword_loc: (1,0)-(1,5) = "begin"
            ├── statements: ∅
            ├── rescue_clause: ∅
            ├── else_clause: ∅
            ├── ensure_clause:
            │   @ EnsureNode (location: (1,6)-(1,16))
            │   ├── flags: ∅
            │   ├── ensure_keyword_loc: (1,6)-(1,12) = "ensure"
            │   ├── statements: ∅
            │   └── end_keyword_loc: (1,13)-(1,16) = "end"
            └── end_keyword_loc: (1,13)-(1,16) = "end"
