@ 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:
            │       │   @ HashPatternNode (location: (11...23))
            │       │   ├── constant:
            │       │   │   @ ConstantReadNode (location: (11...17))
            │       │   │   └── name: :Object
            │       │   ├── assocs: (length: 1)
            │       │   │   └── @ AssocNode (location: (18...22))
            │       │   │       ├── key:
            │       │   │       │   @ SymbolNode (location: (18...20))
            │       │   │       │   ├── opening_loc: ∅
            │       │   │       │   ├── value_loc: (18...19) = "b"
            │       │   │       │   ├── closing_loc: (19...20) = ":"
            │       │   │       │   └── unescaped: "b"
            │       │   │       ├── value:
            │       │   │       │   @ IntegerNode (location: (21...22))
            │       │   │       │   └── flags: decimal
            │       │   │       └── operator_loc: ∅
            │       │   ├── kwrest: ∅
            │       │   ├── opening_loc: (17...18) = "["
            │       │   └── closing_loc: (22...23) = "]"
            │       ├── statements:
            │       │   @ StatementsNode (location: (26...27))
            │       │   └── body: (length: 1)
            │       │       └── @ IntegerNode (location: (26...27))
            │       │           └── flags: decimal
            │       ├── in_loc: (8...10) = "in"
            │       └── then_loc: ∅
            ├── consequent: ∅
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (28...31) = "end"
