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`onReceiveOrNull` defined on `ReceiveChannel` interface is now deprecated, and `onReceiveOrNull` extension function defined on `ReceiveChannel` is now `ExperimentalCoroutinesApi`. I'm trying to use extension version of onReceiveOrNull but I can't. Is there anything wrong?

I'm using `kotlinx-coroutines-core:1.3.2`

As real non extension functions are preferred over extension functions you can't call it with that name. You could do:
```
import kotlinx.coroutines.channels.onRecieveOrNull as onRecieveOrNullExtension
```
And use `onRecieveOrNullExtension` instead of `onRecieveOrNull`

Oh, it's Kotlin's grammatical rule,,,, Thanks!  It works fine for me!