Flutter - " control-flow-collections' experiment to be enabled "

-

environment sdk 改成2.6.0 後，重啟就不會出現錯誤了。

environment:
  sdk: ">=2.8.0 <3.0.0"
items: [
  for (var i in currenciesList)
    DropdownMenuItem(
      child: Text('$i'),
      value: '$i',
    )], 

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