@ ProgramNode (location: (1,0)-(16,3))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(16,3))
    └── body: (length: 4)
        ├── @ ModuleNode (location: (1,0)-(2,3))
        │   ├── locals: []
        │   ├── module_keyword_loc: (1,0)-(1,6) = "module"
        │   ├── constant_path:
        │   │   @ ConstantReadNode (location: (1,7)-(1,8))
        │   │   └── name: :A
        │   ├── body: ∅
        │   ├── end_keyword_loc: (2,0)-(2,3) = "end"
        │   └── name: :A
        ├── @ ModuleNode (location: (4,0)-(5,3))
        │   ├── locals: []
        │   ├── module_keyword_loc: (4,0)-(4,6) = "module"
        │   ├── constant_path:
        │   │   @ ConstantPathNode (location: (4,7)-(4,11))
        │   │   ├── parent:
        │   │   │   @ ConstantReadNode (location: (4,7)-(4,8))
        │   │   │   └── name: :A
        │   │   ├── name: :B
        │   │   ├── delimiter_loc: (4,8)-(4,10) = "::"
        │   │   └── name_loc: (4,10)-(4,11) = "B"
        │   ├── body: ∅
        │   ├── end_keyword_loc: (5,0)-(5,3) = "end"
        │   └── name: :B
        ├── @ ModuleNode (location: (7,0)-(8,3))
        │   ├── locals: []
        │   ├── module_keyword_loc: (7,0)-(7,6) = "module"
        │   ├── constant_path:
        │   │   @ ConstantPathNode (location: (7,7)-(7,14))
        │   │   ├── parent:
        │   │   │   @ ConstantPathNode (location: (7,7)-(7,11))
        │   │   │   ├── parent:
        │   │   │   │   @ ConstantReadNode (location: (7,7)-(7,8))
        │   │   │   │   └── name: :A
        │   │   │   ├── name: :B
        │   │   │   ├── delimiter_loc: (7,8)-(7,10) = "::"
        │   │   │   └── name_loc: (7,10)-(7,11) = "B"
        │   │   ├── name: :C
        │   │   ├── delimiter_loc: (7,11)-(7,13) = "::"
        │   │   └── name_loc: (7,13)-(7,14) = "C"
        │   ├── body: ∅
        │   ├── end_keyword_loc: (8,0)-(8,3) = "end"
        │   └── name: :C
        └── @ ModuleNode (location: (10,0)-(16,3))
            ├── locals: []
            ├── module_keyword_loc: (10,0)-(10,6) = "module"
            ├── constant_path:
            │   @ ConstantReadNode (location: (10,7)-(10,8))
            │   └── name: :A
            ├── body:
            │   @ StatementsNode (location: (11,2)-(15,5))
            │   └── body: (length: 2)
            │       ├── @ CallNode (location: (11,2)-(11,16))
            │       │   ├── flags: ignore_visibility
            │       │   ├── receiver: ∅
            │       │   ├── call_operator_loc: ∅
            │       │   ├── name: :include
            │       │   ├── message_loc: (11,2)-(11,9) = "include"
            │       │   ├── opening_loc: (11,9)-(11,10) = "("
            │       │   ├── arguments:
            │       │   │   @ ArgumentsNode (location: (11,10)-(11,15))
            │       │   │   ├── flags: ∅
            │       │   │   └── arguments: (length: 1)
            │       │   │       └── @ CallNode (location: (11,10)-(11,15))
            │       │   │           ├── flags: ∅
            │       │   │           ├── receiver:
            │       │   │           │   @ ConstantReadNode (location: (11,10)-(11,11))
            │       │   │           │   └── name: :B
            │       │   │           ├── call_operator_loc: (11,11)-(11,12) = "."
            │       │   │           ├── name: :new
            │       │   │           ├── message_loc: (11,12)-(11,15) = "new"
            │       │   │           ├── opening_loc: ∅
            │       │   │           ├── arguments: ∅
            │       │   │           ├── closing_loc: ∅
            │       │   │           └── block: ∅
            │       │   ├── closing_loc: (11,15)-(11,16) = ")"
            │       │   └── block: ∅
            │       └── @ DefNode (location: (13,2)-(15,5))
            │           ├── name: :foo
            │           ├── name_loc: (13,6)-(13,9) = "foo"
            │           ├── receiver: ∅
            │           ├── parameters: ∅
            │           ├── body:
            │           │   @ StatementsNode (location: (14,4)-(14,8))
            │           │   └── body: (length: 1)
            │           │       └── @ SymbolNode (location: (14,4)-(14,8))
            │           │           ├── flags: forced_us_ascii_encoding
            │           │           ├── opening_loc: (14,4)-(14,5) = ":"
            │           │           ├── value_loc: (14,5)-(14,8) = "bar"
            │           │           ├── closing_loc: ∅
            │           │           └── unescaped: "bar"
            │           ├── locals: []
            │           ├── def_keyword_loc: (13,2)-(13,5) = "def"
            │           ├── operator_loc: ∅
            │           ├── lparen_loc: ∅
            │           ├── rparen_loc: ∅
            │           ├── equal_loc: ∅
            │           └── end_keyword_loc: (15,2)-(15,5) = "end"
            ├── end_keyword_loc: (16,0)-(16,3) = "end"
            └── name: :A