java.lang.IllegalAccessError with ProGuard enabled

Hey,

I’m executing a simple coroutine:

launch {
  delay(300, MILLISECONDS)
  launch(UI) { view.doStuff() }
}

which works fine without running ProGuard.

However, when it’s enabled, it’s crashing with:

Fatal Exception: java.lang.IllegalAccessError
Final field 'c.c.a.a.c.a' cannot be written to by method 'void c.c.a.a.d.<clinit>()' (declaration of 'c.c.a.a.d' appears in /data/app/de.memorian.gzg-vqA1ApwTLUsJNJy9FqbjTw==/base.apk)
kotlin.coroutines.experimental.intrinsics.IntrinsicsKt__IntrinsicsKt__Clinit.
kotlin.coroutines.experimental.intrinsics.IntrinsicsKt__IntrinsicsKt__Clinit. (Unknown Source:1060)
kotlin.coroutines.experimental.intrinsics.IntrinsicsKt__IntrinsicsKt__Clinit.$$clinitTrigger (Unknown Source)
de.memorian.gzg.presentation.actions.ActionsPresenter$scrollDelayedToTop$1.invoke (Unknown Source)
kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume (CoroutineImpl.kt:42)
kotlinx.coroutines.experimental.DispatchedTask$DefaultImpls.run (Dispatched.kt:162)
kotlinx.coroutines.experimental.DispatchedContinuation.run (Dispatched.kt:26)

Kotlin version: 1.2.50 Coroutine version: 0.23.3

ProGuard:

-keepclassmembernames class kotlinx.** {
    volatile <fields>;
}

[max-kammerer]

Could use check your build with

-keepclassmembers class  *  {
    void $$clinit();
}

[Syex]

Closing this issue then as it’s not related to coroutines.