@ ProgramNode (location: (0...7))
├── locals: [:x]
└── statements:
    @ StatementsNode (location: (0...7))
    └── body: (length: 1)
        └── @ LocalVariableWriteNode (location: (0...7))
            ├── name: :x
            ├── depth: 0
            ├── name_loc: (0...1) = "x"
            ├── value:
            │   @ StringNode (location: (4...7))
            │   ├── opening_loc: (4...6) = "%\n"
            │   ├── content_loc: (6...6) = ""
            │   ├── closing_loc: (6...7) = "\n"
            │   └── unescaped: ""
            └── operator_loc: (2...3) = "="
