override fun misses(vararg cachedScripts: CachedScript) =
        cachedScripts.forEach { assertCompilations(it, 1) }

    override fun hits(vararg cachedScripts: CachedScript) =
        cachedScripts.forEach { assertCompilations(it, 0) }

    private
    fun assertCompilations(cachedScript: CachedScript, count: Int) =
        when (cachedScript) {
            is CachedScript.WholeFile -> cachedScript.stages.forEach { assertCompilations(it, count) }

    override fun misses(vararg cachedScripts: CachedScript) =
        cachedScripts.forEach { assertClassLoads(it, 1) }

    override fun hits(vararg cachedScripts: CachedScript) =
        cachedScripts.forEach { assertClassLoads(it, 0) }

    private
    fun assertClassLoads(cachedScript: CachedScript, count: Int) =
        when (cachedScript) {
            is CachedScript.WholeFile -> cachedScript.stages.forEach { assertClassLoads(it, count) }

import java.io.File


internal
interface KotlinDslCacheFixture {
    fun misses(vararg cachedScripts: CachedScript)
    fun hits(vararg cachedScripts: CachedScript)
}


sealed class CachedScript {

    class WholeFile(
        val stage1: CompilationStage,
        val stage2: CompilationStage
    ) : CachedScript() {

        val stages = listOf(stage1, stage2)
    }

    class CompilationStage(

class CompileTrace(private val operations: List<String>) {

    fun assertScriptCompile(stage: CachedScript.CompilationStage) {
        val description = operationDescription(stage)
        require(operations.any { it.contains(description) }) {
            "Expecting operation `$description`!"
        }
    }

    fun assertNoScriptCompile(stage: CachedScript.CompilationStage) {
        val description = operationDescription(stage)

        it is Program.Script || it is Program.Staged
    }


private
data class MultiProjectCachedScripts(
    val settingsFile: CachedScript.WholeFile,
    val rootBuildFile: CachedScript.WholeFile,
    val leftBuildFile: CachedScript.WholeFile,
    val rightBuildFile: CachedScript.WholeFile