@ ProgramNode (location: (1,0)-(1,7))
├── locals: [:a]
└── statements:
    @ StatementsNode (location: (1,0)-(1,7))
    └── body: (length: 1)
        └── @ LocalVariableOrWriteNode (location: (1,0)-(1,7))
            ├── name_loc: (1,0)-(1,1) = "a"
            ├── operator_loc: (1,2)-(1,5) = "||="
            ├── value:
            │   @ IntegerNode (location: (1,6)-(1,7))
            │   ├── flags: decimal
            │   └── value: 1
            ├── name: :a
            └── depth: 0