syntax_data: {"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let (_, field_id) = item_and_field_ids[i];
context_before:     for i in 0..show_cycle_len {
context_after:         let (next_item_id, _) = item_and_field_ids[(i + 1) % cycle_len];