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kotlinlang

I've got this warning:
```The DefaultSourceDirectorySet constructor has been deprecated. This is scheduled to be removed in Gradle 5.0. Please use the ObjectFactory service to create instances of SourceDirectorySet instead.```
I have absolutely no idea what it's about and what it means, and I can't find anything about, apart from the source code logging this line

Same for this one:
```The ProjectLayout.fileProperty() method has been deprecated. This is scheduled to be removed in Gradle 5.0. Please use the ObjectFactory.fileProperty() method instead.```

I'm using Gradle 5.0-M1 and I'm not planning to rollback to 4.10