@ ProgramNode (location: (0...10))
├── locals: [:a]
└── statements:
    @ StatementsNode (location: (0...10))
    └── body: (length: 1)
        └── @ MultiWriteNode (location: (0...10))
            ├── targets: (length: 2)
            │   ├── @ LocalVariableTargetNode (location: (0...1))
            │   │   ├── name: :a
            │   │   └── depth: 0
            │   └── @ CallNode (location: (3...6))
            │       ├── receiver:
            │       │   @ CallNode (location: (3...4))
            │       │   ├── receiver: ∅
            │       │   ├── call_operator_loc: ∅
            │       │   ├── message_loc: (3...4) = "b"
            │       │   ├── opening_loc: ∅
            │       │   ├── arguments: ∅
            │       │   ├── closing_loc: ∅
            │       │   ├── block: ∅
            │       │   ├── flags: variable_call
            │       │   └── name: "b"
            │       ├── call_operator_loc: (4...5) = "."
            │       ├── message_loc: (5...6) = "C"
            │       ├── opening_loc: ∅
            │       ├── arguments: ∅
            │       ├── closing_loc: ∅
            │       ├── block: ∅
            │       ├── flags: ∅
            │       └── name: "C="
            ├── lparen_loc: ∅
            ├── rparen_loc: ∅
            ├── operator_loc: (7...8) = "="
            └── value:
                @ CallNode (location: (9...10))
                ├── receiver: ∅
                ├── call_operator_loc: ∅
                ├── message_loc: (9...10) = "d"
                ├── opening_loc: ∅
                ├── arguments: ∅
                ├── closing_loc: ∅
                ├── block: ∅
                ├── flags: variable_call
                └── name: "d"
