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