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