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# System prepended metadata

title: 錯誤紀錄

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# 錯誤紀錄

### vscode出現小蚯蚓，然後顯示`control-flow-collections`相關錯誤
Ans : 
1) Keep the analysis_options.yaml in your root folder with this code:

```yaml
analyzer:
  enable-experiment:
    - control-flow-collections
```
2) Don't use brackets {} in between your for loops Ex:

```java 
<Widget>[
  for (final category in categories) 
    CategoryWidget(category: category)
],
```

3) Important step which is probably why it's not working for you: Change your Dart version constraint in the pubspec.yml file in your root folder to 2.5.2
```yaml
environment:
  sdk: ">=2.5.2 <3.0.0"
```

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