@ ProgramNode (location: (1,0)-(1,11))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,11))
    └── body: (length: 1)
        └── @ CallOrWriteNode (location: (1,0)-(1,11))
            ├── flags: ∅
            ├── receiver:
            │   @ ConstantReadNode (location: (1,0)-(1,1))
            │   └── name: :A
            ├── call_operator_loc: (1,1)-(1,2) = "."
            ├── message_loc: (1,2)-(1,3) = "B"
            ├── read_name: :B
            ├── write_name: :B=
            ├── operator_loc: (1,4)-(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)
                │       └── @ IntegerNode (location: (1,10)-(1,11))
                │           └── flags: decimal
                ├── closing_loc: ∅
                └── block: ∅
