@ ProgramNode (location: (0...16))
├── locals: [:foo, :bar]
└── statements:
    @ StatementsNode (location: (0...16))
    └── body: (length: 1)
        └── @ MultiWriteNode (location: (0...16))
            ├── targets: (length: 2)
            │   ├── @ LocalVariableTargetNode (location: (0...3))
            │   │   ├── name: :foo
            │   │   └── depth: 0
            │   └── @ LocalVariableTargetNode (location: (5...8))
            │       ├── name: :bar
            │       └── depth: 0
            ├── lparen_loc: ∅
            ├── rparen_loc: ∅
            ├── operator_loc: (9...10) = "="
            └── value:
                @ CallNode (location: (11...16))
                ├── receiver: ∅
                ├── call_operator_loc: ∅
                ├── message_loc: (11...12) = "m"
                ├── opening_loc: ∅
                ├── arguments:
                │   @ ArgumentsNode (location: (13...16))
                │   └── arguments: (length: 1)
                │       └── @ LocalVariableReadNode (location: (13...16))
                │           ├── name: :foo
                │           └── depth: 0
                ├── closing_loc: ∅
                ├── block: ∅
                ├── flags: ∅
                └── name: "m"
