I wonder why calling Composable function from regular one doesn't yield any compiler error? (I'm using 1.3.61 Kotlin and latest dev05 compose lib)

That does not sound right. Do you have these enabled in your build.gradle

composeOptions {
        kotlinCompilerExtensionVersion = "0.1.0-dev05"
    }

    buildFeatures {
        compose = true
    }

Thanks! No I don't have such options enabled in my gradle script (surprisingly everything works without these flags). I've failed to add these options to my script because I use Gradle Kotlin DSL. But your example in Groovy. If you know how to convert your code to Kotlin DSL I would much appreciate.

This is in kotlin dsl not groovy. if it was in groovy it would be

buildFeatures{
  compose true
}

note that in the next release things will fail much earlier if you’re not using our compiler plugin