@ ProgramNode (location: (1,0)-(1,10))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,10))
    └── body: (length: 1)
        └── @ ConstantPathWriteNode (location: (1,0)-(1,10))
            ├── target:
            │   @ ConstantPathNode (location: (1,0)-(1,5))
            │   ├── parent: ∅
            │   ├── child:
            │   │   @ ConstantReadNode (location: (1,2)-(1,5))
            │   │   └── name: :Foo
            │   └── delimiter_loc: (1,0)-(1,2) = "::"
            ├── operator_loc: (1,6)-(1,7) = "="
            └── value:
                @ IntegerNode (location: (1,8)-(1,10))
                ├── flags: decimal
                └── value: 10