@ ProgramNode (location: (1,0)-(1,17))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,17))
    └── body: (length: 1)
        └── @ CallNode (location: (1,0)-(1,17))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (1,0)-(1,3) = "tap"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (1,4)-(1,17))
            │   ├── arguments: (length: 1)
            │   │   └── @ ParenthesesNode (location: (1,4)-(1,17))
            │   │       ├── body:
            │   │       │   @ StatementsNode (location: (1,5)-(1,16))
            │   │       │   └── body: (length: 1)
            │   │       │       └── @ CallNode (location: (1,5)-(1,16))
            │   │       │           ├── receiver: ∅
            │   │       │           ├── call_operator_loc: ∅
            │   │       │           ├── message_loc: (1,5)-(1,9) = "proc"
            │   │       │           ├── opening_loc: ∅
            │   │       │           ├── arguments: ∅
            │   │       │           ├── closing_loc: ∅
            │   │       │           ├── block:
            │   │       │           │   @ BlockNode (location: (1,10)-(1,16))
            │   │       │           │   ├── locals: []
            │   │       │           │   ├── parameters: ∅
            │   │       │           │   ├── body: ∅
            │   │       │           │   ├── opening_loc: (1,10)-(1,12) = "do"
            │   │       │           │   └── closing_loc: (1,13)-(1,16) = "end"
            │   │       │           ├── flags: ∅
            │   │       │           └── name: :proc
            │   │       ├── opening_loc: (1,4)-(1,5) = "("
            │   │       └── closing_loc: (1,16)-(1,17) = ")"
            │   └── flags: ∅
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: ∅
            └── name: :tap
