@ ProgramNode (location: (0...38))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...38))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...38))
            ├── predicate:
            │   @ ConstantReadNode (location: (5...10))
            │   └── name: :Array
            ├── conditions: (length: 1)
            │   └── @ InNode (location: (11...24))
            │       ├── pattern:
            │       │   @ ConstantReadNode (location: (14...19))
            │       │   └── name: :Class
            │       ├── statements:
            │       │   @ StatementsNode (location: (22...24))
            │       │   └── body: (length: 1)
            │       │       └── @ SymbolNode (location: (22...24))
            │       │           ├── opening_loc: (22...23) = ":"
            │       │           ├── value_loc: (23...24) = "b"
            │       │           ├── closing_loc: ∅
            │       │           └── unescaped: "b"
            │       ├── in_loc: (11...13) = "in"
            │       └── then_loc: ∅
            ├── consequent:
            │   @ ElseNode (location: (25...38))
            │   ├── else_keyword_loc: (25...29) = "else"
            │   ├── statements:
            │   │   @ StatementsNode (location: (32...34))
            │   │   └── body: (length: 1)
            │   │       └── @ SymbolNode (location: (32...34))
            │   │           ├── opening_loc: (32...33) = ":"
            │   │           ├── value_loc: (33...34) = "c"
            │   │           ├── closing_loc: ∅
            │   │           └── unescaped: "c"
            │   └── end_keyword_loc: (35...38) = "end"
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (35...38) = "end"