@ ProgramNode (location: (1,0)-(7,1))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(7,1))
    ├── flags: ∅
    └── body: (length: 3)
        ├── @ PreExecutionNode (location: (1,0)-(3,1))
        │   ├── flags: newline
        │   ├── statements:
        │   │   @ StatementsNode (location: (2,2)-(2,5))
        │   │   ├── flags: ∅
        │   │   └── body: (length: 1)
        │   │       └── @ CallNode (location: (2,2)-(2,5))
        │   │           ├── flags: newline, variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :foo
        │   │           ├── message_loc: (2,2)-(2,5) = "foo"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── keyword_loc: (1,0)-(1,5) = "BEGIN"
        │   ├── opening_loc: (1,6)-(1,7) = "{"
        │   └── closing_loc: (3,0)-(3,1) = "}"
        ├── @ CallNode (location: (4,0)-(4,3))
        │   ├── flags: newline, variable_call, ignore_visibility
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :bar
        │   ├── message_loc: (4,0)-(4,3) = "bar"
        │   ├── opening_loc: ∅
        │   ├── arguments: ∅
        │   ├── closing_loc: ∅
        │   └── block: ∅
        └── @ PostExecutionNode (location: (5,0)-(7,1))
            ├── flags: newline
            ├── statements:
            │   @ StatementsNode (location: (6,2)-(6,5))
            │   ├── flags: ∅
            │   └── body: (length: 1)
            │       └── @ CallNode (location: (6,2)-(6,5))
            │           ├── flags: newline, variable_call, ignore_visibility
            │           ├── receiver: ∅
            │           ├── call_operator_loc: ∅
            │           ├── name: :baz
            │           ├── message_loc: (6,2)-(6,5) = "baz"
            │           ├── opening_loc: ∅
            │           ├── arguments: ∅
            │           ├── closing_loc: ∅
            │           └── block: ∅
            ├── keyword_loc: (5,0)-(5,3) = "END"
            ├── opening_loc: (5,4)-(5,5) = "{"
            └── closing_loc: (7,0)-(7,1) = "}"
