@ ProgramNode (location: (1,0)-(2,6))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(2,6))
    └── body: (length: 1)
        └── @ SymbolNode (location: (1,0)-(2,6))
            ├── flags: forced_us_ascii_encoding
            ├── opening_loc: (1,0)-(1,2) = ":\""
            ├── value_loc: (1,2)-(2,5) = "foo\n  bar"
            ├── closing_loc: (2,5)-(2,6) = "\""
            └── unescaped: "foo\n  bar"
