@ ProgramNode (location: (0...5))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...5))
    └── body: (length: 1)
        └── @ RegularExpressionNode (location: (0...5))
            ├── opening_loc: (0...1) = "/"
            ├── content_loc: (1...3) = "#)"
            ├── closing_loc: (3...5) = "/x"
            ├── unescaped: "#)"
            └── flags: extended
