@ DocumentNode (location: (1:0)-(2:0))
└── children: (2 items)
    ├── @ ERBContentNode (location: (1:0)-(1:41))
    │   ├── tag_opening: "<%" (location: (1:0)-(1:2))
    │   ├── content: " numbers.map { |number| number * 2 } " (location: (1:2)-(1:39))
    │   ├── tag_closing: "%>" (location: (1:39)-(1:41))
    │   ├── parsed: true
    │   └── valid: true
    │
    └── @ HTMLTextNode (location: (1:41)-(2:0))
        └── content: "\n"