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@ ProgramNode (location: (1,0)-(3,11))
├── locals: []
└── statements:
@ StatementsNode (location: (1,0)-(3,11))
└── body: (length: 2)
├── @ AliasGlobalVariableNode (location: (1,0)-(1,11))
│ ├── new_name:
│ │ @ GlobalVariableReadNode (location: (1,6)-(1,8))
│ │ └── name: :$a
│ ├── old_name:
│ │ @ BackReferenceReadNode (location: (1,9)-(1,11))
│ │ └── name: :$+
│ └── keyword_loc: (1,0)-(1,5) = "alias"
└── @ AliasGlobalVariableNode (location: (3,0)-(3,11))
├── new_name:
│ @ GlobalVariableReadNode (location: (3,6)-(3,8))
│ └── name: :$a
├── old_name:
│ @ GlobalVariableReadNode (location: (3,9)-(3,11))
│ └── name: :$b
└── keyword_loc: (3,0)-(3,5) = "alias"
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