{"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"SyntaxElement::Token(tok)"}]}
            SyntaxElement::Token(tok) => {
            SyntaxElement::Node(node) => ast::Attr::cast(node).map(Either::Left),
                ast::Comment::cast(tok).filter(ast::Comment::is_doc).map(Either::Right)