{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"MetaVarKind::Ident"}]}
                MetaVarKind::Ident => input.expect_ident().map(drop).map_err(|()| {
            let err = match kind {
                    ExpandError::binding_error(span.unwrap_or(delim_span.close), "expected ident")