document:
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    - object: block
      type: code_block
      nodes:
        - object: block
          type: code_line
          nodes:
            - object: text
              leaves:
                - text: 'function compare(a, b) {'
        - object: block
          type: code_line
          nodes:
            - object: text
              leaves:
                - text: '    return a < b;'
        - object: block
          type: code_line
          nodes:
            - object: text
              leaves:
                - text: '}'