@ ProgramNode (location: (1,0)-(1,6))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,6))
    └── body: (length: 1)
        └── @ XStringNode (location: (1,0)-(1,6))
            ├── flags: ∅
            ├── opening_loc: (1,0)-(1,1) = "`"
            ├── content_loc: (1,1)-(1,5) = "f\\oo"
            ├── closing_loc: (1,5)-(1,6) = "`"
            └── unescaped: "foo"