@ ProgramNode (location: (1,0)-(6,3))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(6,3))
    ├── flags: ∅
    └── body: (length: 2)
        ├── @ StringNode (location: (1,0)-(1,8))
        │   ├── flags: newline
        │   ├── opening_loc: (1,0)-(1,8) = "<<-EOFOO"
        │   ├── content_loc: (2,0)-(3,0) = "\\n\\n\\n\\n\\n\\n\\n\\n\\n\n"
        │   ├── closing_loc: (3,0)-(4,0) = "EOFOO\n"
        │   └── unescaped: "\n\n\n\n\n\n\n\n\n\n"
        └── @ ClassNode (location: (5,0)-(6,3))
            ├── flags: newline
            ├── locals: []
            ├── class_keyword_loc: (5,0)-(5,5) = "class"
            ├── constant_path:
            │   @ ConstantReadNode (location: (5,6)-(5,9))
            │   ├── flags: ∅
            │   └── name: :Foo
            ├── inheritance_operator_loc: ∅
            ├── superclass: ∅
            ├── body: ∅
            ├── end_keyword_loc: (6,0)-(6,3) = "end"
            └── name: :Foo
