@ ProgramNode (location: (1,0)-(7,1))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(7,1))
    └── body: (length: 2)
        ├── @ ArrayNode (location: (1,0)-(2,3))
        │   ├── flags: ∅
        │   ├── elements: (length: 1)
        │   │   └── @ StringNode (location: (1,1)-(2,1))
        │   │       ├── flags: ∅
        │   │       ├── opening_loc: (1,1)-(1,2) = "\""
        │   │       ├── content_loc: (1,2)-(2,0) = "  some text\n"
        │   │       ├── closing_loc: (2,0)-(2,1) = "\""
        │   │       └── unescaped: "  some text\n"
        │   ├── opening_loc: (1,0)-(1,1) = "["
        │   └── closing_loc: (2,2)-(2,3) = "]"
        └── @ ArrayNode (location: (4,0)-(7,1))
            ├── flags: ∅
            ├── elements: (length: 1)
            │   └── @ StringNode (location: (4,1)-(4,8))
            │       ├── flags: ∅
            │       ├── opening_loc: (4,1)-(4,8) = "<<-FILE"
            │       ├── content_loc: (5,0)-(6,0) = "  some text\n"
            │       ├── closing_loc: (6,0)-(7,0) = "FILE\n"
            │       └── unescaped: "  some text\n"
            ├── opening_loc: (4,0)-(4,1) = "["
            └── closing_loc: (7,0)-(7,1) = "]"