@ ProgramNode (location: (0...37))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...37))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...37))
            ├── predicate:
            │   @ SymbolNode (location: (5...7))
            │   ├── opening_loc: (5...6) = ":"
            │   ├── value_loc: (6...7) = "a"
            │   ├── closing_loc: ∅
            │   └── unescaped: "a"
            ├── conditions: (length: 2)
            │   ├── @ InNode (location: (8...20))
            │   │   ├── pattern:
            │   │   │   @ ConstantPathNode (location: (11...15))
            │   │   │   ├── parent:
            │   │   │   │   @ ConstantReadNode (location: (11...12))
            │   │   │   │   └── name: :A
            │   │   │   ├── child:
            │   │   │   │   @ ConstantReadNode (location: (14...15))
            │   │   │   │   └── name: :B
            │   │   │   └── delimiter_loc: (12...14) = "::"
            │   │   ├── statements:
            │   │   │   @ StatementsNode (location: (18...20))
            │   │   │   └── body: (length: 1)
            │   │   │       └── @ SymbolNode (location: (18...20))
            │   │   │           ├── opening_loc: (18...19) = ":"
            │   │   │           ├── value_loc: (19...20) = "C"
            │   │   │           ├── closing_loc: ∅
            │   │   │           └── unescaped: "C"
            │   │   ├── in_loc: (8...10) = "in"
            │   │   └── then_loc: ∅
            │   └── @ InNode (location: (21...33))
            │       ├── pattern:
            │       │   @ ConstantPathNode (location: (24...28))
            │       │   ├── parent:
            │       │   │   @ ConstantReadNode (location: (24...25))
            │       │   │   └── name: :D
            │       │   ├── child:
            │       │   │   @ ConstantReadNode (location: (27...28))
            │       │   │   └── name: :E
            │       │   └── delimiter_loc: (25...27) = "::"
            │       ├── statements:
            │       │   @ StatementsNode (location: (31...33))
            │       │   └── body: (length: 1)
            │       │       └── @ SymbolNode (location: (31...33))
            │       │           ├── opening_loc: (31...32) = ":"
            │       │           ├── value_loc: (32...33) = "F"
            │       │           ├── closing_loc: ∅
            │       │           └── unescaped: "F"
            │       ├── in_loc: (21...23) = "in"
            │       └── then_loc: ∅
            ├── consequent: ∅
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (34...37) = "end"
