@ ProgramNode (location: (0...5))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...5))
    └── body: (length: 1)
        └── @ ConstantPathNode (location: (0...5))
            ├── parent: ∅
            ├── child:
            │   @ ConstantReadNode (location: (2...5))
            │   └── name: :Foo
            └── delimiter_loc: (0...2) = "::"
