@ ProgramNode (location: (1,0)-(4,3))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(4,3))
    └── body: (length: 1)
        └── @ CaseMatchNode (location: (1,0)-(4,3))
            ├── predicate:
            │   @ CallNode (location: (1,5)-(1,8))
            │   ├── flags: variable_call, ignore_visibility
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── name: :obj
            │   ├── message_loc: (1,5)-(1,8) = "obj"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   └── block: ∅
            ├── conditions: (length: 1)
            │   └── @ InNode (location: (2,0)-(3,6))
            │       ├── pattern:
            │       │   @ ArrayPatternNode (location: (2,3)-(2,11))
            │       │   ├── constant:
            │       │   │   @ ConstantReadNode (location: (2,3)-(2,9))
            │       │   │   └── name: :Object
            │       │   ├── requireds: (length: 0)
            │       │   ├── rest: ∅
            │       │   ├── posts: (length: 0)
            │       │   ├── opening_loc: (2,9)-(2,10) = "["
            │       │   └── closing_loc: (2,10)-(2,11) = "]"
            │       ├── statements:
            │       │   @ StatementsNode (location: (3,2)-(3,6))
            │       │   └── body: (length: 1)
            │       │       └── @ TrueNode (location: (3,2)-(3,6))
            │       ├── in_loc: (2,0)-(2,2) = "in"
            │       └── then_loc: ∅
            ├── consequent: ∅
            ├── case_keyword_loc: (1,0)-(1,4) = "case"
            └── end_keyword_loc: (4,0)-(4,3) = "end"