@ ProgramNode (location: (1,0)-(1,12))
├── locals: [:a]
└── statements:
    @ StatementsNode (location: (1,0)-(1,12))
    └── body: (length: 1)
        └── @ MultiWriteNode (location: (1,0)-(1,12))
            ├── lefts: (length: 0)
            ├── rest:
            │   @ SplatNode (location: (1,0)-(1,2))
            │   ├── operator_loc: (1,0)-(1,1) = "*"
            │   └── expression:
            │       @ LocalVariableTargetNode (location: (1,1)-(1,2))
            │       ├── name: :a
            │       └── depth: 0
            ├── rights: (length: 0)
            ├── lparen_loc: ∅
            ├── rparen_loc: ∅
            ├── operator_loc: (1,3)-(1,4) = "="
            └── value:
                @ ArrayNode (location: (1,5)-(1,12))
                ├── flags: ∅
                ├── elements: (length: 3)
                │   ├── @ IntegerNode (location: (1,5)-(1,6))
                │   │   ├── flags: decimal
                │   │   └── value: 1
                │   ├── @ IntegerNode (location: (1,8)-(1,9))
                │   │   ├── flags: decimal
                │   │   └── value: 2
                │   └── @ IntegerNode (location: (1,11)-(1,12))
                │       ├── flags: decimal
                │       └── value: 3
                ├── opening_loc: ∅
                └── closing_loc: ∅