@ ProgramNode (location: (1,0)-(1,15))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,15))
    └── body: (length: 1)
        └── @ CallNode (location: (1,0)-(1,15))
            ├── flags: ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :a
            ├── message_loc: (1,0)-(1,1) = "a"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (1,2)-(1,15))
            │   ├── flags: ∅
            │   └── arguments: (length: 1)
            │       └── @ ParenthesesNode (location: (1,2)-(1,15))
            │           ├── body:
            │           │   @ StatementsNode (location: (1,3)-(1,14))
            │           │   └── body: (length: 1)
            │           │       └── @ ConstantPathOperatorWriteNode (location: (1,3)-(1,14))
            │           │           ├── target:
            │           │           │   @ ConstantPathNode (location: (1,3)-(1,7))
            │           │           │   ├── parent:
            │           │           │   │   @ ConstantReadNode (location: (1,3)-(1,4))
            │           │           │   │   └── name: :B
            │           │           │   ├── child:
            │           │           │   │   @ ConstantReadNode (location: (1,6)-(1,7))
            │           │           │   │   └── name: :C
            │           │           │   └── delimiter_loc: (1,4)-(1,6) = "::"
            │           │           ├── operator_loc: (1,8)-(1,10) = "*="
            │           │           ├── value:
            │           │           │   @ CallNode (location: (1,11)-(1,14))
            │           │           │   ├── flags: ignore_visibility
            │           │           │   ├── receiver: ∅
            │           │           │   ├── call_operator_loc: ∅
            │           │           │   ├── name: :d
            │           │           │   ├── message_loc: (1,11)-(1,12) = "d"
            │           │           │   ├── opening_loc: ∅
            │           │           │   ├── arguments:
            │           │           │   │   @ ArgumentsNode (location: (1,13)-(1,14))
            │           │           │   │   ├── flags: ∅
            │           │           │   │   └── arguments: (length: 1)
            │           │           │   │       └── @ CallNode (location: (1,13)-(1,14))
            │           │           │   │           ├── flags: variable_call, ignore_visibility
            │           │           │   │           ├── receiver: ∅
            │           │           │   │           ├── call_operator_loc: ∅
            │           │           │   │           ├── name: :e
            │           │           │   │           ├── message_loc: (1,13)-(1,14) = "e"
            │           │           │   │           ├── opening_loc: ∅
            │           │           │   │           ├── arguments: ∅
            │           │           │   │           ├── closing_loc: ∅
            │           │           │   │           └── block: ∅
            │           │           │   ├── closing_loc: ∅
            │           │           │   └── block: ∅
            │           │           └── operator: :*
            │           ├── opening_loc: (1,2)-(1,3) = "("
            │           └── closing_loc: (1,14)-(1,15) = ")"
            ├── closing_loc: ∅
            └── block: ∅
