@ ProgramNode (location: (1,0)-(1,9))
├── flags: ∅
├── locals: [:a, :b]
└── statements:
    @ StatementsNode (location: (1,0)-(1,9))
    ├── flags: ∅
    └── body: (length: 1)
        └── @ MultiWriteNode (location: (1,0)-(1,9))
            ├── flags: newline
            ├── lefts: (length: 1)
            │   └── @ MultiTargetNode (location: (1,1)-(1,6))
            │       ├── flags: ∅
            │       ├── lefts: (length: 2)
            │       │   ├── @ LocalVariableTargetNode (location: (1,2)-(1,3))
            │       │   │   ├── flags: ∅
            │       │   │   ├── name: :a
            │       │   │   └── depth: 0
            │       │   └── @ LocalVariableTargetNode (location: (1,4)-(1,5))
            │       │       ├── flags: ∅
            │       │       ├── name: :b
            │       │       └── depth: 0
            │       ├── rest: ∅
            │       ├── rights: (length: 0)
            │       ├── lparen_loc: (1,1)-(1,2) = "("
            │       └── rparen_loc: (1,5)-(1,6) = ")"
            ├── rest: ∅
            ├── rights: (length: 0)
            ├── lparen_loc: (1,0)-(1,1) = "("
            ├── rparen_loc: (1,6)-(1,7) = ")"
            ├── operator_loc: (1,7)-(1,8) = "="
            └── value:
                @ CallNode (location: (1,8)-(1,9))
                ├── flags: variable_call, ignore_visibility
                ├── receiver: ∅
                ├── call_operator_loc: ∅
                ├── name: :c
                ├── message_loc: (1,8)-(1,9) = "c"
                ├── opening_loc: ∅
                ├── arguments: ∅
                ├── closing_loc: ∅
                └── block: ∅
