@ ProgramNode (location: (0...26))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...26))
    └── body: (length: 2)
        ├── @ CallNode (location: (0...9))
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── message_loc: (0...3) = "fun"
        │   ├── opening_loc: (3...4) = "("
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (4...8))
        │   │   └── arguments: (length: 1)
        │   │       └── @ SplatNode (location: (4...8))
        │   │           ├── operator_loc: (4...5) = "*"
        │   │           └── expression:
        │   │               @ CallNode (location: (5...8))
        │   │               ├── receiver: ∅
        │   │               ├── call_operator_loc: ∅
        │   │               ├── message_loc: (5...8) = "bar"
        │   │               ├── opening_loc: ∅
        │   │               ├── arguments: ∅
        │   │               ├── closing_loc: ∅
        │   │               ├── block: ∅
        │   │               ├── flags: variable_call
        │   │               └── name: "bar"
        │   ├── closing_loc: (8...9) = ")"
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "fun"
        └── @ CallNode (location: (11...26))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (11...14) = "fun"
            ├── opening_loc: (14...15) = "("
            ├── arguments:
            │   @ ArgumentsNode (location: (15...25))
            │   └── arguments: (length: 2)
            │       ├── @ SplatNode (location: (15...19))
            │       │   ├── operator_loc: (15...16) = "*"
            │       │   └── expression:
            │       │       @ CallNode (location: (16...19))
            │       │       ├── receiver: ∅
            │       │       ├── call_operator_loc: ∅
            │       │       ├── message_loc: (16...19) = "bar"
            │       │       ├── opening_loc: ∅
            │       │       ├── arguments: ∅
            │       │       ├── closing_loc: ∅
            │       │       ├── block: ∅
            │       │       ├── flags: variable_call
            │       │       └── name: "bar"
            │       └── @ BlockArgumentNode (location: (21...25))
            │           ├── expression:
            │           │   @ CallNode (location: (22...25))
            │           │   ├── receiver: ∅
            │           │   ├── call_operator_loc: ∅
            │           │   ├── message_loc: (22...25) = "baz"
            │           │   ├── opening_loc: ∅
            │           │   ├── arguments: ∅
            │           │   ├── closing_loc: ∅
            │           │   ├── block: ∅
            │           │   ├── flags: variable_call
            │           │   └── name: "baz"
            │           └── operator_loc: (21...22) = "&"
            ├── closing_loc: (25...26) = ")"
            ├── block: ∅
            ├── flags: ∅
            └── name: "fun"
