val extension = this.extensions.create<ErrorProneSourceSetExtension>("errorprone", project.objects.property<Boolean>())
        // Enable it only for the main source set by default, as incremental Groovy
        // joint-compilation doesn't work with the Error Prone annotation processor
        extension.enabled.convention(this.name == "main")

        project.dependencies.addProvider(

val spockVersion = if (isGroovy4) "2.2-groovy-4.0" else "2.2-groovy-3.0"
val asmVersion = "9.7"
// To try out better kotlin compilation avoidance and incremental compilation
// with -Pkotlin.incremental.useClasspathSnapshot=true
val kotlinVersion = providers.gradleProperty("buildKotlinVersion")
    .getOrElse(embeddedKotlinVersion)

dependencies {
    constraints {