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@ ProgramNode (location: (1,0)-(2,14))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(2,14))
└── body: (length: 2)
├── @ UndefNode (location: (1,0)-(1,9))
│ ├── names: (length: 1)
│ │ └── @ SymbolNode (location: (1,6)-(1,9))
│ │ ├── opening_loc: ∅
│ │ ├── value_loc: (1,6)-(1,9) = "foo"
│ │ ├── closing_loc: ∅
│ │ └── unescaped: "foo"
│ └── keyword_loc: (1,0)-(1,5) = "undef"
└── @ UndefNode (location: (2,0)-(2,14))
├── names: (length: 2)
│ ├── @ SymbolNode (location: (2,6)-(2,9))
│ │ ├── opening_loc: ∅
│ │ ├── value_loc: (2,6)-(2,9) = "foo"
│ │ ├── closing_loc: ∅
│ │ └── unescaped: "foo"
│ └── @ SymbolNode (location: (2,11)-(2,14))
│ ├── opening_loc: ∅
│ ├── value_loc: (2,11)-(2,14) = "bar"
│ ├── closing_loc: ∅
│ └── unescaped: "bar"
└── keyword_loc: (2,0)-(2,5) = "undef"
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