{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"Either::Left(it)"}]}
                Either::Left(it) => ast::Param::cast(it.syntax().parent()?)?.syntax().parent(),
            let it = match Either::<ast::Pat, ast::Name>::cast(container.value)? {
                Either::Right(it) => ast::SelfParam::cast(it.syntax().parent()?)?.syntax().parent(),