{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"ExpandError::binding_error(span.unwrap_or(delim_span.close),"}]}
                    ExpandError::binding_error(span.unwrap_or(delim_span.close), "expected ident")
                MetaVarKind::Ident => input.expect_ident().map(drop).map_err(|()| {
                }),