@ ProgramNode (location: (0...43))
├── locals: [:a, :rest]
└── statements:
    @ StatementsNode (location: (0...43))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...43))
            ├── predicate:
            │   @ HashNode (location: (5...11))
            │   ├── opening_loc: (5...6) = "{"
            │   ├── elements: (length: 1)
            │   │   └── @ AssocNode (location: (6...10))
            │   │       ├── key:
            │   │       │   @ SymbolNode (location: (6...8))
            │   │       │   ├── opening_loc: ∅
            │   │       │   ├── value_loc: (6...7) = "a"
            │   │       │   ├── closing_loc: (7...8) = ":"
            │   │       │   └── unescaped: "a"
            │   │       ├── value:
            │   │       │   @ IntegerNode (location: (9...10))
            │   │       │   └── flags: decimal
            │   │       └── operator_loc: ∅
            │   └── closing_loc: (10...11) = "}"
            ├── conditions: (length: 1)
            │   └── @ InNode (location: (12...39))
            │       ├── pattern:
            │       │   @ HashPatternNode (location: (15...27))
            │       │   ├── constant: ∅
            │       │   ├── assocs: (length: 2)
            │       │   │   ├── @ AssocNode (location: (16...18))
            │       │   │   │   ├── key:
            │       │   │   │   │   @ SymbolNode (location: (16...18))
            │       │   │   │   │   ├── opening_loc: ∅
            │       │   │   │   │   ├── value_loc: (16...17) = "a"
            │       │   │   │   │   ├── closing_loc: (17...18) = ":"
            │       │   │   │   │   └── unescaped: "a"
            │       │   │   │   ├── value: ∅
            │       │   │   │   └── operator_loc: ∅
            │       │   │   └── @ AssocSplatNode (location: (20...26))
            │       │   │       ├── value:
            │       │   │       │   @ LocalVariableTargetNode (location: (22...26))
            │       │   │       │   ├── name: :rest
            │       │   │       │   └── depth: 0
            │       │   │       └── operator_loc: (20...22) = "**"
            │       │   ├── kwrest: ∅
            │       │   ├── opening_loc: (15...16) = "{"
            │       │   └── closing_loc: (26...27) = "}"
            │       ├── statements:
            │       │   @ StatementsNode (location: (30...39))
            │       │   └── body: (length: 1)
            │       │       └── @ ArrayNode (location: (30...39))
            │       │           ├── elements: (length: 2)
            │       │           │   ├── @ LocalVariableReadNode (location: (31...32))
            │       │           │   │   ├── name: :a
            │       │           │   │   └── depth: 0
            │       │           │   └── @ LocalVariableReadNode (location: (34...38))
            │       │           │       ├── name: :rest
            │       │           │       └── depth: 0
            │       │           ├── opening_loc: (30...31) = "["
            │       │           └── closing_loc: (38...39) = "]"
            │       ├── in_loc: (12...14) = "in"
            │       └── then_loc: ∅
            ├── consequent: ∅
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (40...43) = "end"
