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kotlinlang

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This doesn't seem to go away, any body know how to create experimental annotation

What is the complaint about `+=` on the right side?

Its just complaining that it is reassigning a list (as list is not mutable and adding element through creating a new list), so says explicitly put like `freeCompilerArgs = freeCompilerArgs + listOf(...)`

And does it only warn in the ide or also if you are building from the command line?

It ran away putting it under sourcesets.all
```all {
    languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
}```

instead of targets.all and specifying it like on the jvm

Ah, so the free args are not parsed for content when importing the project, but you need to use the proper model option

Yes, this is a popular problem <https://youtrack.jetbrains.com/issue/KT-28611>, please vote