stackTracePtr

            fn stackTracePtr(
                bucket: *BucketHeader,
                slot_count: usize,
                slot_index: SlotIndex,
                trace_kind: TraceKind,
            ) *[stack_n]usize {
                const start_ptr = @as([*]u8, @ptrCast(bucket)) + bucketStackFramesStart(slot_count);
                const addr = start_ptr + one_trace_size * traces_per_slot * slot_index +
                    @backingInt(trace_kind) * @as(usize, one_trace_size);
                return @ptrCast(@alignCast(addr));
            }