@ ProgramNode (location: (0...40))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...40))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...40))
            ├── predicate:
            │   @ CallNode (location: (5...8))
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── message_loc: (5...8) = "foo"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   ├── block: ∅
            │   ├── flags: variable_call
            │   └── name: "foo"
            ├── conditions: (length: 1)
            │   └── @ WhenNode (location: (10...25))
            │       ├── keyword_loc: (10...14) = "when"
            │       ├── conditions: (length: 1)
            │       │   └── @ StringNode (location: (15...20))
            │       │       ├── opening_loc: (15...16) = "'"
            │       │       ├── content_loc: (16...19) = "bar"
            │       │       ├── closing_loc: (19...20) = "'"
            │       │       └── unescaped: "bar"
            │       └── statements:
            │           @ StatementsNode (location: (22...25))
            │           └── body: (length: 1)
            │               └── @ CallNode (location: (22...25))
            │                   ├── receiver: ∅
            │                   ├── call_operator_loc: ∅
            │                   ├── message_loc: (22...25) = "bar"
            │                   ├── opening_loc: ∅
            │                   ├── arguments: ∅
            │                   ├── closing_loc: ∅
            │                   ├── block: ∅
            │                   ├── flags: variable_call
            │                   └── name: "bar"
            ├── consequent:
            │   @ ElseNode (location: (27...40))
            │   ├── else_keyword_loc: (27...31) = "else"
            │   ├── statements:
            │   │   @ StatementsNode (location: (32...35))
            │   │   └── body: (length: 1)
            │   │       └── @ CallNode (location: (32...35))
            │   │           ├── receiver: ∅
            │   │           ├── call_operator_loc: ∅
            │   │           ├── message_loc: (32...35) = "baz"
            │   │           ├── opening_loc: ∅
            │   │           ├── arguments: ∅
            │   │           ├── closing_loc: ∅
            │   │           ├── block: ∅
            │   │           ├── flags: variable_call
            │   │           └── name: "baz"
            │   └── end_keyword_loc: (37...40) = "end"
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (37...40) = "end"
