@ ProgramNode (location: (0...19))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...19))
    └── body: (length: 4)
        ├── @ FalseNode (location: (0...5))
        ├── @ NilNode (location: (6...9))
        ├── @ SelfNode (location: (10...14))
        └── @ TrueNode (location: (15...19))
