# panic: runtime error: index out of range [3] with length 2 (in goroutine)

- **ID:** `go/goroutine-panic-unrecovered`
- **Domain:** go
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

goroutine中访问了超出切片范围的索引，导致panic。

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.21 | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   if i < len(slice) { v := slice[i] }
   ```
2. **** (85% success)
   ```
   go func(){ defer func(){ if r := recover(); r != nil { log.Println(r) } }(); /* ... */ }()
   ```

## Dead Ends

- **** — 检查不充分，可能仍有边界情况。 (60% fail)
- **** — recover只能恢复，但数据可能未处理。 (70% fail)