@ ProgramNode (location: (0...14))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...14))
    └── body: (length: 1)
        └── @ AliasMethodNode (location: (0...14))
            ├── new_name:
            │   @ SymbolNode (location: (6...10))
            │   ├── opening_loc: (6...7) = ":"
            │   ├── value_loc: (7...10) = "foo"
            │   ├── closing_loc: ∅
            │   └── unescaped: "foo"
            ├── old_name:
            │   @ SymbolNode (location: (11...14))
            │   ├── opening_loc: ∅
            │   ├── value_loc: (11...14) = "bar"
            │   ├── closing_loc: ∅
            │   └── unescaped: "bar"
            └── keyword_loc: (0...5) = "alias"
