@ ProgramNode (location: (0...31))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...31))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...31))
            ├── predicate:
            │   @ SymbolNode (location: (5...7))
            │   ├── opening_loc: (5...6) = ":"
            │   ├── value_loc: (6...7) = "a"
            │   ├── closing_loc: ∅
            │   └── unescaped: "a"
            ├── conditions: (length: 1)
            │   └── @ InNode (location: (8...27))
            │       ├── pattern:
            │       │   @ ArrayPatternNode (location: (11...22))
            │       │   ├── constant: ∅
            │       │   ├── requireds: (length: 0)
            │       │   ├── rest:
            │       │   │   @ SplatNode (location: (12...13))
            │       │   │   ├── operator_loc: (12...13) = "*"
            │       │   │   └── expression: ∅
            │       │   ├── posts: (length: 2)
            │       │   │   ├── @ SymbolNode (location: (15...17))
            │       │   │   │   ├── opening_loc: (15...16) = ":"
            │       │   │   │   ├── value_loc: (16...17) = "b"
            │       │   │   │   ├── closing_loc: ∅
            │       │   │   │   └── unescaped: "b"
            │       │   │   └── @ SymbolNode (location: (19...21))
            │       │   │       ├── opening_loc: (19...20) = ":"
            │       │   │       ├── value_loc: (20...21) = "c"
            │       │   │       ├── closing_loc: ∅
            │       │   │       └── unescaped: "c"
            │       │   ├── opening_loc: (11...12) = "["
            │       │   └── closing_loc: (21...22) = "]"
            │       ├── statements:
            │       │   @ StatementsNode (location: (25...27))
            │       │   └── body: (length: 1)
            │       │       └── @ SymbolNode (location: (25...27))
            │       │           ├── opening_loc: (25...26) = ":"
            │       │           ├── value_loc: (26...27) = "d"
            │       │           ├── closing_loc: ∅
            │       │           └── unescaped: "d"
            │       ├── in_loc: (8...10) = "in"
            │       └── then_loc: ∅
            ├── consequent: ∅
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (28...31) = "end"
