@ ProgramNode (location: (1,0)-(2,15))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(2,15))
    └── body: (length: 2)
        ├── @ AliasGlobalVariableNode (location: (1,0)-(1,15))
        │   ├── new_name:
        │   │   @ GlobalVariableReadNode (location: (1,6)-(1,10))
        │   │   └── name: :$foo
        │   ├── old_name:
        │   │   @ GlobalVariableReadNode (location: (1,11)-(1,15))
        │   │   └── name: :$bar
        │   └── keyword_loc: (1,0)-(1,5) = "alias"
        └── @ AliasMethodNode (location: (2,0)-(2,15))
            ├── new_name:
            │   @ SymbolNode (location: (2,6)-(2,10))
            │   ├── flags: forced_us_ascii_encoding
            │   ├── opening_loc: (2,6)-(2,7) = ":"
            │   ├── value_loc: (2,7)-(2,10) = "foo"
            │   ├── closing_loc: ∅
            │   └── unescaped: "foo"
            ├── old_name:
            │   @ SymbolNode (location: (2,11)-(2,15))
            │   ├── flags: forced_us_ascii_encoding
            │   ├── opening_loc: (2,11)-(2,12) = ":"
            │   ├── value_loc: (2,12)-(2,15) = "bar"
            │   ├── closing_loc: ∅
            │   └── unescaped: "bar"
            └── keyword_loc: (2,0)-(2,5) = "alias"