@ ProgramNode (location: (0...43))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...43))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...43))
            ├── predicate:
            │   @ ArrayNode (location: (5...13))
            │   ├── elements: (length: 2)
            │   │   ├── @ SymbolNode (location: (6...8))
            │   │   │   ├── opening_loc: (6...7) = ":"
            │   │   │   ├── value_loc: (7...8) = "a"
            │   │   │   ├── closing_loc: ∅
            │   │   │   └── unescaped: "a"
            │   │   └── @ SymbolNode (location: (10...12))
            │   │       ├── opening_loc: (10...11) = ":"
            │   │       ├── value_loc: (11...12) = "b"
            │   │       ├── closing_loc: ∅
            │   │       └── unescaped: "b"
            │   ├── opening_loc: (5...6) = "["
            │   └── closing_loc: (12...13) = "]"
            ├── conditions: (length: 1)
            │   └── @ InNode (location: (14...39))
            │       ├── pattern:
            │       │   @ ArrayPatternNode (location: (17...30))
            │       │   ├── constant: ∅
            │       │   ├── requireds: (length: 1)
            │       │   │   └── @ ConstantPathNode (location: (17...27))
            │       │   │       ├── parent: ∅
            │       │   │       ├── child:
            │       │   │       │   @ ConstantReadNode (location: (19...27))
            │       │   │       │   └── name: :NilClass
            │       │   │       └── delimiter_loc: (17...19) = "::"
            │       │   ├── rest:
            │       │   │   @ SplatNode (location: (29...30))
            │       │   │   ├── operator_loc: (29...30) = "*"
            │       │   │   └── expression: ∅
            │       │   ├── posts: (length: 0)
            │       │   ├── opening_loc: ∅
            │       │   └── closing_loc: ∅
            │       ├── statements:
            │       │   @ StatementsNode (location: (36...39))
            │       │   └── body: (length: 1)
            │       │       └── @ NilNode (location: (36...39))
            │       ├── in_loc: (14...16) = "in"
            │       └── then_loc: (31...35) = "then"
            ├── consequent: ∅
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (40...43) = "end"
