{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"for"}]}
                    for metavar_idx in next_metavar..next_metavar + num_metavar_decls {
                    // Install an empty vec for each metavar within the sequence.
                        mp.push_match(metavar_idx, seq_depth, MatchedSeq(vec![]));