@ ProgramNode (location: (1,0)-(3,9))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(3,9))
    └── body: (length: 2)
        ├── @ ParenthesesNode (location: (1,0)-(1,2))
        │   ├── body: ∅
        │   ├── opening_loc: (1,0)-(1,1) = "("
        │   └── closing_loc: (1,1)-(1,2) = ")"
        └── @ BeginNode (location: (3,0)-(3,9))
            ├── begin_keyword_loc: (3,0)-(3,5) = "begin"
            ├── statements: ∅
            ├── rescue_clause: ∅
            ├── else_clause: ∅
            ├── ensure_clause: ∅
            └── end_keyword_loc: (3,6)-(3,9) = "end"