Looks like Compose currently is incompatible with ...

# compose

[Sergey Y.]

Looks like Compose currently is incompatible with the Android Kotlin Extensions. Once you enable kotlin-android-extensions plugin and use kotlinx.android.synthetic in the code your project will not compile.
Kotlin compiler throws the error:

This build uses unsafe internal compiler arguments:

-XXLanguage:+NonParenthesizedAnnotationsOnFunctionalTypes

This mode is not recommended for production use,
as no stability/compatibility guarantees are given on
compiler or generated code. Use it at your own risk!

e: java.lang.AssertionError: Unbound symbols not allowed
  Unbound public symbol for public kotlinx.android.synthetic.main.activity_main/main_nav_host.<get-main_nav_host>|-3528664450170310972[0]
  Unbound public symbol for public kotlinx.android.synthetic.main.activity_main/main_bottom_bar.<get-main_bottom_bar>|4532161378387945271[0]
  at org.jetbrains.kotlin.psi2ir.Psi2IrTranslator.generateModuleFragment(Psi2IrTranslator.kt:96)
...

Adding Compose to existing projects can be difficult right now.
I will file an issue on this.