Android Studio 3.0.1 started to produced warnings like this one:

Warning: Stripped invalid locals information from 1 method.

Methods with invalid locals information:
  java.lang.Object kotlin.collections.SlidingWindowKt$windowedIterator$1.doResume(java.lang.Object, java.lang.Throwable)
Some warnings are typically a sign of using an outdated Java toolchain. To fix, recompile the source with an updated toolchain.

Cannot figure out what changed…

D8 dexer?

Yes, dexer is D8. I guess it is safe to ignore this?

I went ahead and created an issue to track it https://youtrack.jetbrains.com/issue/KT-22154