@ ProgramNode (location: (1,0)-(2,1))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(2,1))
    └── body: (length: 2)
        ├── @ StringNode (location: (1,0)-(1,6))
        │   ├── flags: ∅
        │   ├── opening_loc: (1,0)-(1,1) = "\""
        │   ├── content_loc: (1,1)-(1,5) = "a\\nb"
        │   ├── closing_loc: (1,5)-(1,6) = "\""
        │   └── unescaped: "a\nb"
        └── @ IntegerNode (location: (2,0)-(2,1))
            ├── flags: decimal
            └── value: 1