{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"}"}]}
        } else if ast::TupleField::can_cast(syntax.kind()) {
            <ast::RecordField as AstNode>::cast(syntax).map(FieldSource::Named)
            <ast::TupleField as AstNode>::cast(syntax).map(FieldSource::Pos)