sakura-3 opened a new issue, #1200:
URL: https://github.com/apache/rocketmq-client-go/issues/1200
**BUG REPORT**
1. Please describe the issue you observed:
- What did you do (The steps to reproduce)?
尝试向一个已存在的非空文件写入内容。
- What did you expect to see?
内容成功写入指定位置,原文件内容写入到备份文件中。
- What did you see instead?
备份文件内容为空
2. Please tell us about your environment:
3. Other information (e.g. detailed explanation, logs, related issues,
suggestions on how to fix, etc):
应该是`err==nil` 时写入

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