struct Region {
    blocks: List<i32>,
    total: i64,
}

fn tick(r: mut Region, scale: i32) {
    for i in 0usize..r.blocks.len() {
        r.blocks[i] = r.blocks[i] * scale + 1
        r.total += i64(r.blocks[i])
    }
}

fn main() {
    var regions = List<Region>()
    for k in 0..16 {
        regions.push(Region { blocks: [k, k + 1, k + 2], total: 0 })
    }
    let scale = 3
    parallel for k in 0usize..regions.len() {
        tick(mut regions[k], scale)
    }
    println("{regions[0].total} {regions[15].total}")
}

struct cx_par_game__main_3_c { cx_list_game__Region* regions; cx_i32 scale; cx_u64 cx__lo; };
static void cx_par_game__main_3(void* cx__v, cx_u64 cx__begin, cx_u64 cx__end) {
    struct cx_par_game__main_3_c* cx__c = (struct cx_par_game__main_3_c*)cx__v;
    cx_list_game__Region* restrict regions = cx__c->regions;
    CX_VIEW(regions);
    const cx_i32 scale = cx__c->scale;
    for (cx_u64 cx__i = cx__begin; cx__i < cx__end; cx__i++) {
        cx_usize k = (cx_usize)(cx__c->cx__lo + cx__i);
        game__tick(&(*regions).ptr[cx_index(k, (*regions).len, "game.calx:20:26")], scale);
        cx_cont3:;
    }
}

// and in main, where the loop was:
struct cx_par_game__main_3_c cx_t10 = {&regions, scale, (cx_u64)cx_t8};
cx_parallel((cx_u64)cx_t9 - (cx_u64)cx_t8, cx_par_game__main_3, &cx_t10);