Demo app to reproduce Kotlin bug KT-24825
Running the app as it is in this repo will give you the following crash on startup:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: conorodonnell.kotlinbug, PID: 19963
java.lang.NoClassDefFoundError: Failed resolution of: Lconorodonnell/kotlinbug/BugView$sam$rx_functions_Action1$0;
at conorodonnell.kotlinbug.BugView.<init>(MainActivity.kt:36)
at conorodonnell.kotlinbug.MainActivity.onCreate(MainActivity.kt:23)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.ClassNotFoundException: Didn't find class "conorodonnell.kotlinbug.BugView$sam$rx_functions_Action1$0" on path: DexPathList[[zip file "/data/app/conorodonnell.kotlinbug-6ln_4Ne9XRRgS-TXh7SB9Q==/base.apk"],nativeLibraryDirectories=[/data/app/conorodonnell.kotlinbug-6ln_4Ne9XRRgS-TXh7SB9Q==/lib/x86, /system/lib, /vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at conorodonnell.kotlinbug.BugView.<init>(MainActivity.kt:36)
at conorodonnell.kotlinbug.MainActivity.onCreate(MainActivity.kt:23)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
If you search in the subdirectories of your app/build/tmp/kotlin-classes directory after a build, you'll see a number of BugView*.class files. The BugView$sam$rx_functions_Action1$0 one will be missing.
If you follow the instructions in BugView class, commenting out A and uncommenting B, you'll see the app compiles and runs fine.
You can also switch the Kotlin version from 1.2.40 to 1.2.31 in the root build.gradle file and the app will compile and run fine.
In either case, the corresponding .class file for the missing class will be present with the other ones.