public abstract fun getInvalidationReason(): String

    public abstract fun isAccessible(): Boolean
    public abstract fun getInaccessibilityReason(): String
}

public typealias KtLifetimeToken = KaLifetimeToken

public abstract class KaLifetimeTokenFactory {
    public abstract val identifier: KClass<out KaLifetimeToken>

import com.intellij.openapi.project.Project
import org.jetbrains.kotlin.analysis.api.lifetime.KtLifetimeToken
import org.jetbrains.kotlin.analysis.api.platform.KaEngineService

/**
 * [KaLifetimeTracker] is an *engine service* which tracks the current [KtLifetimeToken].
 *
 * It can be used in the implementation of custom lifetime tokens to check that the accessed token is in scope.
 */

import org.jetbrains.kotlin.analysis.api.lifetime.KtLifetimeToken
import org.jetbrains.kotlin.analysis.api.platform.lifetime.KaLifetimeTracker

internal class KaBaseLifetimeTracker : KaLifetimeTracker {
    private val lifetimeOwnersStack = ThreadLocal.withInitial<PersistentList<KtLifetimeToken>> { persistentListOf() }

    override val currentToken: KtLifetimeToken? get() = lifetimeOwnersStack.get().lastOrNull()