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kotlinlang

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Looks like upgrading the kotlin plugin to 1.4 rc broke my project :slightly_smiling_face:

```android {
    buildFeatures {
        compose true
    }
    composeOptions {
        kotlinCompilerExtensionVersion "${compose_version}"
        kotlinCompilerVersion "1.4.0-dev-withExperimentalGoogleExtensions-20200720"
    }
}```
Did you update the compiler version?

Having the same issue when adding Jetpack Compose to my project. I have the compiler version in my configuration.

is your project single module or multi? It has to be applied to all modules

Single (just `app` included). You can view my current experimentation here: <https://github.com/fredagsdeploy/cheer-with-me/tree/feature/jetpack-compose/android> if that's any help. I've more or less copied the sample here <https://github.com/romainguy/sample-materials-shop> for the gradle configuration

And I'm running Android Studio Canary :
```Android Studio 4.2 Canary 5
Build #AI-201.7846.76.42.6682321, built on July 15, 2020
Runtime version: 1.8.0_242-release-1644-b01 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 10 10.0
GC: ParNew, ConcurrentMarkSweep
Memory: 1237M
Cores: 24
Non-Bundled Plugins: org.jetbrains.kotlin```

interesting next question was gonna be the compiler arg to skip pre release checks but you have that too

```tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
    kotlinOptions {
        jvmTarget = "1.8"
        freeCompilerArgs += ["-Xallow-jvm-ir-dependencies", "-Xskip-prerelease-check"]
    }
}```

wondering if we need an updated compiler version

Hmm, I didn't change anything (just fiddled back and forth with Kotlin-plugin settings etc) and now the Android Studio errors are gone.

Still stuck on compiler error when trying to build though.

Or nevermind. Just doing any code change re-triggered the Android studio errors

Changing kotlin version in buildscript to 1.4.0-rc fixed it

Ah, nice!

Now I just need to find out how to debug my internal compilation error. :confused:

&gt; Changing kotlin version in buildscript to 1.4.0-rc fixed it
Awesome find, seems the problem occured due to this recent kotlin plugin update.
Compose should probably update the instructions here:
<https://developer.android.com/jetpack/androidx/releases/compose>

probably should update coroutines as well to `1.3.8-1.4.0-rc`