@ ProgramNode (location: (0...22))
├── locals: [:测试]
└── statements:
    @ StatementsNode (location: (0...22))
    └── body: (length: 2)
        ├── @ GlobalVariableWriteNode (location: (0...11))
        │   ├── name: :$测试
        │   ├── name_loc: (0...7) = "$测试"
        │   ├── value:
        │   │   @ IntegerNode (location: (10...11))
        │   │   └── flags: decimal
        │   └── operator_loc: (8...9) = "="
        └── @ LocalVariableWriteNode (location: (12...22))
            ├── name: :测试
            ├── depth: 0
            ├── name_loc: (12...18) = "测试"
            ├── value:
            │   @ IntegerNode (location: (21...22))
            │   └── flags: decimal
            └── operator_loc: (19...20) = "="
