@ ProgramNode (location: (0...4))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...4))
    └── body: (length: 1)
        └── @ StringNode (location: (0...4))
            ├── opening_loc: (0...4) = "<<~A"
            ├── content_loc: (4...5) = "\n"
            ├── closing_loc: (5...7) = "A\n"
            └── unescaped: ""
