@ ProgramNode (location: (1,0)-(1,11))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,11))
    └── body: (length: 1)
        └── @ CallOperatorWriteNode (location: (1,0)-(1,11))
            ├── flags: ∅
            ├── receiver:
            │   @ ConstantReadNode (location: (1,0)-(1,1))
            │   └── name: :A
            ├── call_operator_loc: (1,1)-(1,3) = "::"
            ├── message_loc: (1,3)-(1,4) = "b"
            ├── read_name: :b
            ├── write_name: :b=
            ├── operator: :*
            ├── operator_loc: (1,5)-(1,7) = "*="
            └── value:
                @ CallNode (location: (1,8)-(1,11))
                ├── flags: ignore_visibility
                ├── receiver: ∅
                ├── call_operator_loc: ∅
                ├── name: :c
                ├── message_loc: (1,8)-(1,9) = "c"
                ├── opening_loc: ∅
                ├── arguments:
                │   @ ArgumentsNode (location: (1,10)-(1,11))
                │   ├── flags: ∅
                │   └── arguments: (length: 1)
                │       └── @ CallNode (location: (1,10)-(1,11))
                │           ├── flags: variable_call, ignore_visibility
                │           ├── receiver: ∅
                │           ├── call_operator_loc: ∅
                │           ├── name: :d
                │           ├── message_loc: (1,10)-(1,11) = "d"
                │           ├── opening_loc: ∅
                │           ├── arguments: ∅
                │           ├── closing_loc: ∅
                │           └── block: ∅
                ├── closing_loc: ∅
                └── block: ∅