syntax_data: {"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let (next_item_id, _) = item_and_field_ids[(i + 1) % cycle_len];
context_before:         let (_, field_id) = item_and_field_ids[i];
context_after:         // Find the span(s) that contain the next item in the cycle