@ ProgramNode (location: (0...27))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...27))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...27))
            ├── predicate:
            │   @ SymbolNode (location: (5...7))
            │   ├── opening_loc: (5...6) = ":"
            │   ├── value_loc: (6...7) = "a"
            │   ├── closing_loc: ∅
            │   └── unescaped: "a"
            ├── conditions: (length: 1)
            │   └── @ InNode (location: (8...23))
            │       ├── pattern:
            │       │   @ RangeNode (location: (11...14))
            │       │   ├── left:
            │       │   │   @ IntegerNode (location: (11...12))
            │       │   │   └── flags: decimal
            │       │   ├── right: ∅
            │       │   ├── operator_loc: (12...14) = ".."
            │       │   └── flags: ∅
            │       ├── statements:
            │       │   @ StatementsNode (location: (20...23))
            │       │   └── body: (length: 1)
            │       │       └── @ NilNode (location: (20...23))
            │       ├── in_loc: (8...10) = "in"
            │       └── then_loc: (15...19) = "then"
            ├── consequent: ∅
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (24...27) = "end"
