@ ProgramNode (location: (0...20))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...20))
    └── body: (length: 1)
        └── @ ClassNode (location: (0...20))
            ├── locals: []
            ├── class_keyword_loc: (0...5) = "class"
            ├── constant_path:
            │   @ ConstantReadNode (location: (6...9))
            │   └── name: :Foo
            ├── inheritance_operator_loc: (10...11) = "<"
            ├── superclass:
            │   @ ConstantReadNode (location: (12...15))
            │   └── name: :Bar
            ├── body: ∅
            ├── end_keyword_loc: (17...20) = "end"
            └── name: :Foo
