anchor.diff:        return _kernelContext.library.documentationComment;
       }
       if (_unlinkedDefiningUnit != null) {
  -      return _unlinkedDefiningUnit?.libraryDocumentationComment?.text;
  +      return _unlinkedDefiningUnit.libraryDocumentationComment?.text;
       }
       return super.documentationComment;
     }
  
positive.code:       return _kernel.documentationComment;
      }
      if (serializedExecutable != null) {
        return serializedExecutable?.documentationComment?.text;
      }
      return super.documentationComment;
    }
  
negative.code:       return _kernel.documentationComment;
      }
      if (_unlinkedVariable != null) {
        return _unlinkedVariable.documentationComment?.text;
      }
      return super.documentationComment;
    }
  