@ ProgramNode (location: (1,0)-(1,15))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,15))
    └── body: (length: 1)
        └── @ ModuleNode (location: (1,0)-(1,15))
            ├── locals: []
            ├── module_keyword_loc: (1,0)-(1,6) = "module"
            ├── constant_path:
            │   @ ConstantReadNode (location: (1,7)-(1,10))
            │   └── name: :Foo
            ├── body: ∅
            ├── end_keyword_loc: (1,12)-(1,15) = "end"
            └── name: :Foo