# panic: 关闭已关闭的 channel

- **ID:** `go/channel-close-receive-panic`
- **领域:** go
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

试图关闭一个已经关闭的 channel。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 1.0+ | active | — | — |

## 解决方案

1. **** (98% 成功率)
   ```
   var once sync.Once
closeCh := func() {
    once.Do(func() { close(ch) })
}
   ```
2. **** (95% 成功率)
   ```
   go func() {
    defer close(ch)
    // send values
}()
   ```

## 无效尝试

- **** — Hides double-close bug, may lead to inconsistent state (80% 失败率)
- **** — No built-in way to check if channel is closed without receiving (70% 失败率)