# 错误[E0277]：`std::cell::Cell<i32>` 无法在线程间安全共享

- **ID:** `rust/e0277-send-not-satisfied-for-arc-cell`
- **领域:** rust
- **类别:** type_error
- **错误码:** `E0277`
- **验证级别:** ai_generated
- **修复率:** 85%

## 根因

在期望为 Send 的共享所有权容器（如 Arc）中使用了非 Send 类型（如 Cell）。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 1.70 | active | — | — |
| 1.75 | active | — | — |
| 1.80 | active | — | — |

## 解决方案

1. ```
   Replace Cell with Mutex inside Arc: `Arc<Mutex<i32>>` instead of `Arc<Cell<i32>>`
   ```
2. ```
   Use `RwLock` if read-heavy workload: `Arc<RwLock<i32>>`
   ```
3. ```
   For single-threaded context, use `Rc<RefCell<i32>>` instead of Arc
   ```

## 无效尝试

- **Wrapping Cell in Arc directly without any synchronization** — Arc<Cell<T>> is not Send because Cell is !Send. The compiler correctly rejects this. (95% 失败率)
- **Using Mutex<Cell<T>> but forgetting to implement Send manually** — Mutex<Cell<T>> is Send if T: Send, but Cell is !Send, so it still fails. Need to switch to Mutex<T> directly. (70% 失败率)