diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt
index 57f33887209..382ecc0df30 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt
@@ -447,7 +447,7 @@ private fun buildFunctionDeclaration(irFunction: IrFunction, origin: IrDeclarati
                 IrSimpleFunctionSymbolImpl(descriptor),
                 name,
                 irFunction.visibility,
-                Modality.FINAL,
+                if (irFunction.modality === Modality.ABSTRACT) Modality.OPEN else irFunction.modality,
                 irFunction.returnType,
                 irFunction.isInline,
                 false,
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ClassCodegen.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ClassCodegen.kt
index 5f566c20919..8cde1a46879 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ClassCodegen.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ClassCodegen.kt
@@ -89,7 +89,7 @@ open class ClassCodegen protected constructor(
             signature.superclassName,
             signature.interfaces.toTypedArray()
         )
-        AnnotationCodegen.forClass(visitor.visitor, this, typeMapper).genAnnotations(descriptor, null)
+        AnnotationCodegen.forClass(visitor.visitor, this, context.state).genAnnotations(descriptor, null)
         /* TODO: Temporary workaround: ClassBuilder needs a pathless name. */
         val shortName = File(fileEntry.name).name
         visitor.visitSource(shortName, null)
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/BridgeLowering.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/BridgeLowering.kt
index dae003c1bca..e727dc2fc40 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/BridgeLowering.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/BridgeLowering.kt
@@ -306,9 +306,7 @@ class BridgeLowering(val context: JvmBackendContext) : ClassLoweringPass {
                     when (typeSafeBarrierDescription) {
                         BuiltinMethodsWithSpecialGenericSignature.TypeSafeBarrierDescription.MAP_GET_OR_DEFAULT -> irGet(
                             bridgeDescriptor.valueParameters[1].type.toIrType()!!,
-                            IrVariableSymbolImpl(
-                                bridgeDescriptor.valueParameters[1]
-                            )
+                            bridgeFunction.valueParameters[1].symbol
                         )
                         BuiltinMethodsWithSpecialGenericSignature.TypeSafeBarrierDescription.NULL -> irNull()
                         BuiltinMethodsWithSpecialGenericSignature.TypeSafeBarrierDescription.INDEX -> IrConstImpl.int(
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt
index 39a501b075e..c81f4bdfb3f 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt
@@ -6,7 +6,6 @@
 package org.jetbrains.kotlin.backend.jvm.lower
 
 import org.jetbrains.kotlin.backend.common.ClassLoweringPass
-import org.jetbrains.kotlin.backend.common.makePhase
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
 import org.jetbrains.kotlin.backend.common.ir.copyParameterDeclarationsFrom
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
@@ -98,6 +97,7 @@ class InterfaceDelegationLowering(val context: JvmBackendContext) : IrElementTra
                     name,
                     Visibilities.PUBLIC,
                     inheritedFun.modality,
+                    inheritedFun.returnType,
                     isInline = inheritedFun.isInline,
                     isExternal = false,
                     isTailrec = false,
@@ -105,7 +105,6 @@ class InterfaceDelegationLowering(val context: JvmBackendContext) : IrElementTra
                 ).apply {
                     descriptor.bind(this)
                     parent = inheritedFun.parent
-                    returnType = inheritedFun.returnType
                     overriddenSymbols.addAll(inheritedFun.overriddenSymbols)
                     copyParameterDeclarationsFrom(inheritedFun)
                 }
@@ -137,16 +136,4 @@ class InterfaceDelegationLowering(val context: JvmBackendContext) : IrElementTra
     private fun IrSimpleFunction.isDefinitelyNotDefaultImplsMethod() =
         resolveFakeOverride()?.let { origin == IrDeclarationOrigin.IR_EXTERNAL_JAVA_DECLARATION_STUB } == true ||
                 hasAnnotation(PLATFORM_DEPENDENT_ANNOTATION_FQ_NAME)
-
-    private fun IrClass.getNonPrivateInterfaceMethods(): List<Pair<IrSimpleFunction, IrSimpleFunction>> {
-        return declarations.filterIsInstance<IrSimpleFunction>().mapNotNull { function ->
-            val resolved = function.resolveFakeOverride()
-            resolved?.takeIf {
-                resolved !== function && // TODO: take a better look
-                        (resolved.parent as? IrClass)?.isInterface == true &&
-                        !Visibilities.isPrivate(resolved.visibility) &&
-                        resolved.visibility != Visibilities.INVISIBLE_FAKE
-            }?.let { Pair(resolved, function) }
-        }
-    }
 }
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt
index fe8d0776879..9d8ff272518 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt
@@ -11,7 +11,6 @@ import org.jetbrains.kotlin.backend.common.ir.copyTo
 import org.jetbrains.kotlin.backend.common.ir.copyTypeParametersFrom
 import org.jetbrains.kotlin.backend.common.lower.DECLARATION_ORIGIN_FUNCTION_FOR_DEFAULT_PARAMETER
 import org.jetbrains.kotlin.backend.common.lower.InitializersLowering.Companion.clinitName
-import org.jetbrains.kotlin.backend.common.makePhase
 import org.jetbrains.kotlin.backend.common.lower.VariableRemapper
 import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.descriptors.*
@@ -37,9 +36,7 @@ class InterfaceLowering(val context: JvmBackendContext) : IrElementTransformerVo
         val members = defaultImplsIrClass.declarations
 
         irClass.declarations.filterIsInstance<IrFunction>().forEach {
-            if (it.origin == DECLARATION_ORIGIN_FUNCTION_FOR_DEFAULT_PARAMETER) {
-                members.add(it) //just copy $default to DefaultImpls
-            } else if (it is IrSimpleFunction && it.modality != Modality.ABSTRACT && it.origin != IrDeclarationOrigin.FAKE_OVERRIDE) {
+            if (it is IrSimpleFunction && it.modality != Modality.ABSTRACT && it.origin != IrDeclarationOrigin.FAKE_OVERRIDE) {
                 val element = context.declarationFactory.getDefaultImplsFunction(it)
                 members.add(element)
                 element.body = it.body
@@ -79,11 +76,11 @@ internal fun createStaticFunctionWithReceivers(
         name,
         oldFunction.visibility,
         Modality.FINAL,
+        oldFunction.returnType,
         isInline = false, isExternal = false, isTailrec = false, isSuspend = false
     ).apply {
         descriptor.bind(this)
         parent = irParent
-        returnType = oldFunction.returnType
 
         copyTypeParametersFrom(oldFunction)