@ ProgramNode (location: (1,0)-(1,16))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,16))
    ├── flags: ∅
    └── body: (length: 1)
        └── @ DefNode (location: (1,0)-(1,16))
            ├── flags: newline
            ├── name: :f
            ├── name_loc: (1,4)-(1,5) = "f"
            ├── receiver: ∅
            ├── parameters:
            │   @ ParametersNode (location: (1,6)-(1,10))
            │   ├── flags: ∅
            │   ├── requireds: (length: 0)
            │   ├── optionals: (length: 0)
            │   ├── rest:
            │   │   @ RestParameterNode (location: (1,6)-(1,10))
            │   │   ├── flags: ∅
            │   │   ├── name: :foo
            │   │   ├── name_loc: (1,7)-(1,10) = "foo"
            │   │   └── operator_loc: (1,6)-(1,7) = "*"
            │   ├── posts: (length: 0)
            │   ├── keywords: (length: 0)
            │   ├── keyword_rest: ∅
            │   └── block: ∅
            ├── body: ∅
            ├── locals: [:foo]
            ├── def_keyword_loc: (1,0)-(1,3) = "def"
            ├── operator_loc: ∅
            ├── lparen_loc: (1,5)-(1,6) = "("
            ├── rparen_loc: (1,10)-(1,11) = ")"
            ├── equal_loc: ∅
            └── end_keyword_loc: (1,13)-(1,16) = "end"
