diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirScopeProvider.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirScopeProvider.kt
index a4393c00414..1454861c3f9 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirScopeProvider.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirScopeProvider.kt
@@ -199,8 +199,8 @@ internal class KtFirScopeProvider(
     }
 }
 
-private class KtFirDelegatingScopeImpl<S>(
+private class KtFirDelegatingScopeImpl<S : FirContainingNamesAwareScope>(
     override val firScope: S,
     builder: KtSymbolByFirBuilder,
     token: ValidityToken
-) : KtFirDelegatingScope<S>(builder, token), ValidityTokenOwner where S : FirContainingNamesAwareScope, S : FirScope
\ No newline at end of file
+) : KtFirDelegatingScope<S>(builder, token), ValidityTokenOwner
diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirDelegatingScope.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirDelegatingScope.kt
index f2cd670661d..1caf6a00f36 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirDelegatingScope.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirDelegatingScope.kt
@@ -21,10 +21,10 @@ import org.jetbrains.kotlin.analysis.api.symbols.KtConstructorSymbol
 import org.jetbrains.kotlin.analysis.api.withValidityAssertion
 import org.jetbrains.kotlin.name.Name
 
-internal abstract class KtFirDelegatingScope<S>(
+internal abstract class KtFirDelegatingScope<S : FirContainingNamesAwareScope>(
     private val builder: KtSymbolByFirBuilder,
     final override val token: ValidityToken
-) : KtScope where S : FirContainingNamesAwareScope, S : FirScope {
+) : KtScope {
 
     abstract val firScope: S
 
@@ -79,11 +79,11 @@ internal fun FirScope.getCallableSymbols(callableNames: Collection<Name>, builde
     }
 }
 
-internal class KtFirDelegatingScopeImpl<S>(
+internal class KtFirDelegatingScopeImpl<S : FirContainingNamesAwareScope>(
     override val firScope: S,
     builder: KtSymbolByFirBuilder,
     token: ValidityToken
-) : KtFirDelegatingScope<S>(builder, token) where S : FirContainingNamesAwareScope, S : FirScope
+) : KtFirDelegatingScope<S>(builder, token)
 
 
 internal fun FirScope.getClassifierSymbols(classLikeNames: Collection<Name>, builder: KtSymbolByFirBuilder): Sequence<KtClassifierSymbol> =
@@ -104,4 +104,4 @@ internal fun FirScope.getConstructors(builder: KtSymbolByFirBuilder): Sequence<K
             constructorSymbols.add(builder.functionLikeBuilder.buildConstructorSymbol(firSymbol.fir))
         }
         yieldAll(constructorSymbols)
-    }
\ No newline at end of file
+    }
diff --git a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticEnhancementScope.kt b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticEnhancementScope.kt
index 0970e5b8845..b6c35f01487 100644
--- a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticEnhancementScope.kt
+++ b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticEnhancementScope.kt
@@ -9,7 +9,6 @@ import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.java.enhancement.FirSignatureEnhancement
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.scopes.FirContainingNamesAwareScope
-import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.symbols.impl.*
 import org.jetbrains.kotlin.name.Name
 
@@ -17,7 +16,7 @@ class JavaClassStaticEnhancementScope(
     session: FirSession,
     owner: FirRegularClassSymbol,
     private val useSiteStaticScope: JavaClassStaticUseSiteScope,
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
     private val signatureEnhancement = FirSignatureEnhancement(owner.fir, session) {
         emptyList()
     }
diff --git a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticUseSiteScope.kt b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticUseSiteScope.kt
index 802ae9a7a58..917680c47f8 100644
--- a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticUseSiteScope.kt
+++ b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassStaticUseSiteScope.kt
@@ -22,7 +22,7 @@ class JavaClassStaticUseSiteScope internal constructor(
     private val superClassScope: FirScope,
     private val superTypesScopes: List<FirScope>,
     javaTypeParameterStack: JavaTypeParameterStack,
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
     private val functions = hashMapOf<Name, Collection<FirNamedFunctionSymbol>>()
     private val properties = hashMapOf<Name, Collection<FirVariableSymbol<*>>>()
     private val overrideChecker = JavaOverrideChecker(session, javaTypeParameterStack)
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt
index be4f0bbfbfe..6c03e074cc4 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt
@@ -38,7 +38,7 @@ class FirSyntheticFunctionSymbol(
 class FirSyntheticPropertiesScope(
     val session: FirSession,
     private val baseScope: FirTypeScope
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
     private val syntheticNamesProvider = session.syntheticNamesProvider
 
     override fun processPropertiesByName(name: Name, processor: (FirVariableSymbol<*>) -> Unit) {
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/FirTypeParameterScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/FirTypeParameterScope.kt
index e4aa000c4a9..05644389e51 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/FirTypeParameterScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/FirTypeParameterScope.kt
@@ -10,7 +10,7 @@ import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassifierSymbol
 import org.jetbrains.kotlin.name.Name
 
-abstract class FirTypeParameterScope : FirScope(), FirContainingNamesAwareScope {
+abstract class FirTypeParameterScope : FirContainingNamesAwareScope() {
     abstract val typeParameters: Map<Name, List<FirTypeParameter>>
 
     override fun processClassifiersByNameWithSubstitution(
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassDeclaredMemberScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassDeclaredMemberScope.kt
index 111f1f82dbe..ae73487f54d 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassDeclaredMemberScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassDeclaredMemberScope.kt
@@ -17,7 +17,7 @@ import org.jetbrains.kotlin.fir.symbols.impl.*
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.name.SpecialNames
 
-abstract class FirClassDeclaredMemberScope : FirScope(), FirContainingNamesAwareScope
+abstract class FirClassDeclaredMemberScope : FirContainingNamesAwareScope()
 
 class FirClassDeclaredMemberScopeImpl(
     val useSiteSession: FirSession,
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirDelegatedMemberScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirDelegatedMemberScope.kt
index a73c0ac08e0..29448511465 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirDelegatedMemberScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirDelegatedMemberScope.kt
@@ -33,7 +33,7 @@ class FirDelegatedMemberScope(
     private val containingClass: FirClass,
     private val declaredMemberScope: FirScope,
     private val delegateFields: List<FirField>,
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
     private val dispatchReceiverType = containingClass.defaultType()
     private val overrideChecker = FirStandardOverrideChecker(session)
 
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLazyNestedClassifierScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLazyNestedClassifierScope.kt
index 84c439bb58e..adb2f91332e 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLazyNestedClassifierScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLazyNestedClassifierScope.kt
@@ -8,7 +8,6 @@ package org.jetbrains.kotlin.fir.scopes.impl
 import org.jetbrains.kotlin.fir.resolve.providers.FirSymbolProvider
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.scopes.FirContainingNamesAwareScope
-import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassifierSymbol
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.Name
@@ -20,7 +19,7 @@ class FirLazyNestedClassifierScope(
     val classId: ClassId,
     private val existingNames: List<Name>,
     private val symbolProvider: FirSymbolProvider
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
     override fun processClassifiersByNameWithSubstitution(
         name: Name,
         processor: (FirClassifierSymbol<*>, ConeSubstitutor) -> Unit
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLocalScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLocalScope.kt
index 920c126bfad..e8127aea821 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLocalScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLocalScope.kt
@@ -14,7 +14,6 @@ import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
 import org.jetbrains.kotlin.fir.declarations.FirVariable
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.scopes.FirContainingNamesAwareScope
-import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassifierSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirRegularClassSymbol
@@ -26,7 +25,7 @@ class FirLocalScope private constructor(
     val properties: PersistentMap<Name, FirVariableSymbol<*>>,
     val functions: PersistentMultimap<Name, FirNamedFunctionSymbol>,
     val classes: PersistentMap<Name, FirRegularClassSymbol>
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
     constructor() : this(persistentMapOf(), PersistentMultimap(), persistentMapOf())
 
     fun storeClass(klass: FirRegularClass): FirLocalScope {
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScope.kt
index fd7d1e1cc23..c632b1ed2a8 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScope.kt
@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.fir.declarations.FirTypeParameterRef
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutorByMap
 import org.jetbrains.kotlin.fir.scopes.FirContainingNamesAwareScope
-import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.symbols.ConeTypeParameterLookupTag
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassifierSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirRegularClassSymbol
@@ -21,7 +20,7 @@ import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.impl.ConeTypeParameterTypeImpl
 import org.jetbrains.kotlin.name.Name
 
-abstract class FirNestedClassifierScope(val klass: FirClass, val useSiteSession: FirSession) : FirScope(), FirContainingNamesAwareScope {
+abstract class FirNestedClassifierScope(val klass: FirClass, val useSiteSession: FirSession) : FirContainingNamesAwareScope() {
     protected abstract fun getNestedClassSymbol(name: Name): FirRegularClassSymbol?
 
     override fun processClassifiersByNameWithSubstitution(
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScopeWithSubstitution.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScopeWithSubstitution.kt
index 051a4846a1b..daf10ea4385 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScopeWithSubstitution.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirNestedClassifierScopeWithSubstitution.kt
@@ -17,7 +17,7 @@ import org.jetbrains.kotlin.name.Name
 private class FirNestedClassifierScopeWithSubstitution(
     private val scope: FirScope,
     private val substitutor: ConeSubstitutor
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
 
     override fun processFunctionsByName(name: Name, processor: (FirNamedFunctionSymbol) -> Unit) {
         scope.processFunctionsByName(name, processor)
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirObjectImportedCallableScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirObjectImportedCallableScope.kt
index ed16b92273e..4eeb39451d6 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirObjectImportedCallableScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirObjectImportedCallableScope.kt
@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.declarations.builder.buildPropertyCopy
 import org.jetbrains.kotlin.fir.declarations.builder.buildSimpleFunctionCopy
 import org.jetbrains.kotlin.fir.scopes.FirContainingNamesAwareScope
-import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.scopes.FirTypeScope
 import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
@@ -24,7 +23,7 @@ import org.jetbrains.kotlin.name.Name
 class FirObjectImportedCallableScope(
     private val importedClassId: ClassId,
     private val objectUseSiteScope: FirTypeScope
-) : FirScope(), FirContainingNamesAwareScope {
+) : FirContainingNamesAwareScope() {
     override fun processFunctionsByName(name: Name, processor: (FirNamedFunctionSymbol) -> Unit) {
         objectUseSiteScope.processFunctionsByName(name) wrapper@{ symbol ->
             val function = symbol.fir
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyCallablesScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyCallablesScope.kt
index f6d9cd2b446..5cb3e245f71 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyCallablesScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyCallablesScope.kt
@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
 import org.jetbrains.kotlin.name.Name
 
-class FirOnlyCallablesScope(val delegate: FirScope) : FirScope(), FirContainingNamesAwareScope {
+class FirOnlyCallablesScope(val delegate: FirScope) : FirContainingNamesAwareScope() {
     override fun processFunctionsByName(name: Name, processor: (FirNamedFunctionSymbol) -> Unit) {
         return delegate.processFunctionsByName(name, processor)
     }
@@ -27,4 +27,4 @@ class FirOnlyCallablesScope(val delegate: FirScope) : FirScope(), FirContainingN
     override fun getCallableNames(): Set<Name> = delegate.getContainingCallableNamesIfPresent()
 
     override fun getClassifierNames(): Set<Name> = emptySet()
-}
\ No newline at end of file
+}
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyClassifiersScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyClassifiersScope.kt
index 04480e1f0e2..2e07f20d098 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyClassifiersScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirOnlyClassifiersScope.kt
@@ -8,12 +8,11 @@ package org.jetbrains.kotlin.fir.scopes.impl
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.scopes.FirContainingNamesAwareScope
 import org.jetbrains.kotlin.fir.scopes.FirScope
-import org.jetbrains.kotlin.fir.scopes.getContainingCallableNamesIfPresent
 import org.jetbrains.kotlin.fir.scopes.getContainingClassifierNamesIfPresent
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassifierSymbol
 import org.jetbrains.kotlin.name.Name
 
-class FirOnlyClassifiersScope(val delegate: FirScope) : FirScope() , FirContainingNamesAwareScope {
+class FirOnlyClassifiersScope(val delegate: FirScope) : FirContainingNamesAwareScope() {
     override fun processClassifiersByNameWithSubstitution(name: Name, processor: (FirClassifierSymbol<*>, ConeSubstitutor) -> Unit) {
         return delegate.processClassifiersByNameWithSubstitution(name, processor)
     }
@@ -21,4 +20,4 @@ class FirOnlyClassifiersScope(val delegate: FirScope) : FirScope() , FirContaini
     override fun getCallableNames(): Set<Name> = emptySet()
 
     override fun getClassifierNames(): Set<Name> = delegate.getContainingClassifierNamesIfPresent()
-}
\ No newline at end of file
+}
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt
index 111a4f8d4eb..92915ee78e1 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt
@@ -18,7 +18,7 @@ import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
 import org.jetbrains.kotlin.name.Name
 
-class FirStaticScope(private val delegateScope: FirScope) : FirScope(), FirContainingNamesAwareScope {
+class FirStaticScope(private val delegateScope: FirScope) : FirContainingNamesAwareScope() {
     override fun processClassifiersByNameWithSubstitution(name: Name, processor: (FirClassifierSymbol<*>, ConeSubstitutor) -> Unit) {
         delegateScope.processClassifiersByNameWithSubstitution(name, processor)
     }
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirCompositeScope.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirCompositeScope.kt
index eba9be8c759..b6fec096052 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirCompositeScope.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirCompositeScope.kt
@@ -11,7 +11,7 @@ import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
 import org.jetbrains.kotlin.name.Name
 
-class FirCompositeScope(val scopes: Iterable<FirScope>) : FirScope(), FirContainingNamesAwareScope {
+class FirCompositeScope(val scopes: Iterable<FirScope>) : FirContainingNamesAwareScope() {
 
     override fun processClassifiersByNameWithSubstitution(
         name: Name,
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirContainingNamesAwareScope.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirContainingNamesAwareScope.kt
index ebce240c8be..229883c5905 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirContainingNamesAwareScope.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirContainingNamesAwareScope.kt
@@ -5,15 +5,14 @@
 
 package org.jetbrains.kotlin.fir.scopes
 
-import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
 import org.jetbrains.kotlin.name.Name
 
-interface FirContainingNamesAwareScope {
-    fun getCallableNames(): Set<Name>
+abstract class FirContainingNamesAwareScope : FirScope() {
+    abstract fun getCallableNames(): Set<Name>
 
-    fun getClassifierNames(): Set<Name>
+    abstract fun getClassifierNames(): Set<Name>
 }
 
 fun FirScope.getContainingCallableNamesIfPresent(): Set<Name> =
@@ -22,19 +21,19 @@ fun FirScope.getContainingCallableNamesIfPresent(): Set<Name> =
 fun FirScope.getContainingClassifierNamesIfPresent(): Set<Name> =
     if (this is FirContainingNamesAwareScope) getClassifierNames() else emptySet()
 
-fun <S> S.processAllFunctions(processor: (FirNamedFunctionSymbol) -> Unit) where S : FirScope, S : FirContainingNamesAwareScope {
+fun FirContainingNamesAwareScope.processAllFunctions(processor: (FirNamedFunctionSymbol) -> Unit) {
     for (name in getCallableNames()) {
         processFunctionsByName(name, processor)
     }
 }
 
-fun <S> S.processAllProperties(processor: (FirVariableSymbol<*>) -> Unit) where S : FirScope, S : FirContainingNamesAwareScope {
+fun FirContainingNamesAwareScope.processAllProperties(processor: (FirVariableSymbol<*>) -> Unit) {
     for (name in getCallableNames()) {
         processPropertiesByName(name, processor)
     }
 }
 
-fun <S> S.collectAllProperties(): Collection<FirVariableSymbol<*>> where S : FirScope, S : FirContainingNamesAwareScope {
+fun FirContainingNamesAwareScope.collectAllProperties(): Collection<FirVariableSymbol<*>> {
     return mutableListOf<FirVariableSymbol<*>>().apply {
         processAllProperties(this::add)
     }
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirTypeScope.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirTypeScope.kt
index 1d3f6501bea..cf587a67e89 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirTypeScope.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirTypeScope.kt
@@ -14,7 +14,7 @@ import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
 import org.jetbrains.kotlin.name.Name
 
-abstract class FirTypeScope : FirScope(), FirContainingNamesAwareScope {
+abstract class FirTypeScope : FirContainingNamesAwareScope() {
     // If the scope instance is the same as the one from which the symbol was originated, this function supplies
     // all direct overridden members (each of them comes a base scope where grand-parents [overridden of this overridden] may be obtained from)
     //
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirUnstableSmartcastTypeScope.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirUnstableSmartcastTypeScope.kt
index c5eca3c72d8..293c837f548 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirUnstableSmartcastTypeScope.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirUnstableSmartcastTypeScope.kt
@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.name.Name
 class FirUnstableSmartcastTypeScope(
     private val smartcastScope: FirTypeScope,
     private val originalScope: FirTypeScope
-) : FirTypeScope(), FirContainingNamesAwareScope {
+) : FirTypeScope() {
     private val scopes = listOf(originalScope, smartcastScope)
     private val symbolsFromUnstableSmartcast = mutableSetOf<FirCallableSymbol<*>>()
     override fun processClassifiersByNameWithSubstitution(