buildSet {
                // Add an empty scope to the shadowed set to give GlobalSearchScope.union something
                // to work with if there are no extension tools.
                // If there are extension tools, any empty scopes, whether from shadowedSearchScope
                // on the extension tools or from this add() call, will be ignored.
                add(GlobalSearchScope.EMPTY_SCOPE)

`Dependency verification failed` errors when local artifacts are absent or have different hashes listed in the
[verification-metadata.xml](https://github.com/JetBrains/kotlin/blob/master/gradle/verification-metadata.xml) file.

It's expected that `verification-metadata.xml` should only be updated with the commits that modify the build. There are some tips how
to perform such updates:

 * stub-indexing binary libraries). And in general, querying the symbol names provider might be faster since its sets are cached, which is
 * not necessarily the case for declaration providers (e.g. the IDE declaration provider hitting the index without caching).
 *

import org.jetbrains.kotlin.psi.KtElement
import java.util.concurrent.ConcurrentMap
import kotlin.reflect.KClass

/**
 * [KtFirAnalysisSessionProvider] keeps [KtFirAnalysisSession]s in a cache, which are actively invalidated with their associated underlying
 * [LLFirSession][org.jetbrains.kotlin.analysis.low.level.api.fir.sessions.LLFirSession]s.
 */