{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
                let bitmap_index = bx.const_u32(bitmap_idx);
                let hash = bx.const_u64(function_coverage_info.function_source_hash);
                bx.mcdc_tvbitmap_update(fn_name, hash, bitmap_index, cond_bitmap);