@ ProgramNode (location: (4,0)-(9,3))
├── locals: []
└── statements:
    @ StatementsNode (location: (4,0)-(9,3))
    └── body: (length: 1)
        └── @ ClassNode (location: (4,0)-(9,3))
            ├── locals: []
            ├── class_keyword_loc: (4,0)-(4,5) = "class"
            ├── constant_path:
            │   @ ConstantReadNode (location: (4,6)-(4,7))
            │   └── name: :X
            ├── inheritance_operator_loc: ∅
            ├── superclass: ∅
            ├── body:
            │   @ StatementsNode (location: (6,2)-(8,5))
            │   └── body: (length: 1)
            │       └── @ DefNode (location: (6,2)-(8,5))
            │           ├── name: :blah
            │           ├── name_loc: (6,6)-(6,10) = "blah"
            │           ├── receiver: ∅
            │           ├── parameters: ∅
            │           ├── body: ∅
            │           ├── locals: []
            │           ├── def_keyword_loc: (6,2)-(6,5) = "def"
            │           ├── operator_loc: ∅
            │           ├── lparen_loc: ∅
            │           ├── rparen_loc: ∅
            │           ├── equal_loc: ∅
            │           └── end_keyword_loc: (8,2)-(8,5) = "end"
            ├── end_keyword_loc: (9,0)-(9,3) = "end"
            └── name: :X