{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"SliceKind::FixedLen(len)"}]}
                    SliceKind::FixedLen(len) => (len, false),
                let (prefix_len, has_dot_dot) = match slice.kind {
                    SliceKind::VarLen(prefix_len, _) => (prefix_len, true),