@ ProgramNode (location: (0...12))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...12))
    └── body: (length: 1)
        └── @ AliasMethodNode (location: (0...12))
            ├── new_name:
            │   @ SymbolNode (location: (6...8))
            │   ├── opening_loc: ∅
            │   ├── value_loc: (6...8) = "in"
            │   ├── closing_loc: ∅
            │   └── unescaped: "in"
            ├── old_name:
            │   @ SymbolNode (location: (9...12))
            │   ├── opening_loc: ∅
            │   ├── value_loc: (9...12) = "out"
            │   ├── closing_loc: ∅
            │   └── unescaped: "out"
            └── keyword_loc: (0...5) = "alias"
