diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/EnumSpecialDescriptorsFactory.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/EnumSpecialDescriptorsFactory.kt
index fa165e73112..fffeafcd423 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/EnumSpecialDescriptorsFactory.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/EnumSpecialDescriptorsFactory.kt
@@ -9,6 +9,8 @@ import org.jetbrains.kotlin.backend.common.descriptors.WrappedClassDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedFieldDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
 import org.jetbrains.kotlin.backend.common.ir.addSimpleDelegatingConstructor
+import org.jetbrains.kotlin.backend.common.ir.addFakeOverrides
+import org.jetbrains.kotlin.backend.common.ir.createParameterDeclarations
 import org.jetbrains.kotlin.backend.konan.descriptors.synthesizedName
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.Modality
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGen.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGen.kt
index 3dbc018ebcf..659c8184e40 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGen.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGen.kt
@@ -4,6 +4,10 @@ import org.jetbrains.kotlin.backend.common.descriptors.WrappedClassConstructorDe
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedClassDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedValueParameterDescriptor
+import org.jetbrains.kotlin.backend.common.ir.addFakeOverrides
+import org.jetbrains.kotlin.backend.common.ir.createDispatchReceiverParameter
+import org.jetbrains.kotlin.backend.common.ir.createParameterDeclarations
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.common.lower.at
 import org.jetbrains.kotlin.backend.common.lower.irNot
 import org.jetbrains.kotlin.backend.konan.PrimitiveBinaryType
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGenUtils.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGenUtils.kt
index 9a4f9114d97..b58af40a5da 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGenUtils.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGenUtils.kt
@@ -2,6 +2,7 @@ package org.jetbrains.kotlin.backend.konan.cgen
 
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedValueParameterDescriptor
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.common.lower.irBlock
 import org.jetbrains.kotlin.backend.common.lower.irThrow
 import org.jetbrains.kotlin.backend.konan.descriptors.createAnnotation
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassVtablesBuilder.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassVtablesBuilder.kt
index e707ef2af8c..9335d26fba1 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassVtablesBuilder.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassVtablesBuilder.kt
@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.backend.konan.descriptors
 
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.konan.*
 import org.jetbrains.kotlin.backend.konan.ir.*
 import org.jetbrains.kotlin.backend.konan.llvm.functionName
@@ -16,7 +17,6 @@ import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.util.isInterface
 import org.jetbrains.kotlin.ir.util.overrides
-import org.jetbrains.kotlin.ir.util.simpleFunctions
 
 internal class OverriddenFunctionInfo(
         val function: IrSimpleFunction,
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt
index 3736cb35acd..933b009794e 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/KotlinObjCClassInfoGenerator.kt
@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.backend.konan.llvm
 import llvm.LLVMStoreSizeOfType
 import llvm.LLVMValueRef
 import org.jetbrains.kotlin.backend.common.atMostOne
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.konan.*
 import org.jetbrains.kotlin.backend.konan.descriptors.getStringValue
 import org.jetbrains.kotlin.backend.konan.ir.*
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/ObjCExportCodeGenerator.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/ObjCExportCodeGenerator.kt
index ee956b1774f..4c288f995f9 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/ObjCExportCodeGenerator.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/ObjCExportCodeGenerator.kt
@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.backend.konan.llvm.objcexport
 
 import llvm.*
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.konan.*
 import org.jetbrains.kotlin.backend.konan.descriptors.*
 import org.jetbrains.kotlin.backend.konan.ir.allParameters
@@ -23,7 +24,6 @@ import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.constructedClass
 import org.jetbrains.kotlin.ir.util.isInterface
 import org.jetbrains.kotlin.ir.util.parentAsClass
-import org.jetbrains.kotlin.ir.util.simpleFunctions
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.util.OperatorNameConventions
 
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BridgesBuilding.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BridgesBuilding.kt
index 3f7b5baa4f9..64f1cb35c08 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BridgesBuilding.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BridgesBuilding.kt
@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.backend.common.ClassLoweringPass
 import org.jetbrains.kotlin.backend.common.DeclarationContainerLoweringPass
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedValueParameterDescriptor
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.common.lower.irBlockBody
 import org.jetbrains.kotlin.backend.common.lower.irIfThen
@@ -29,7 +30,6 @@ import org.jetbrains.kotlin.ir.symbols.impl.IrSimpleFunctionSymbolImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.isNullableAny
-import org.jetbrains.kotlin.ir.util.simpleFunctions
 import org.jetbrains.kotlin.ir.util.transformFlat
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BuiltinOperatorLowering.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BuiltinOperatorLowering.kt
index cb53aeaff00..0da5430f491 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BuiltinOperatorLowering.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BuiltinOperatorLowering.kt
@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.backend.konan.lower
 
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
 import org.jetbrains.kotlin.backend.common.atMostOne
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.common.lower.IrBuildingTransformer
 import org.jetbrains.kotlin.backend.common.lower.at
 import org.jetbrains.kotlin.backend.common.lower.irNot
@@ -30,6 +31,8 @@ import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.isNothing
 import org.jetbrains.kotlin.ir.types.toKotlinType
 import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.util.defaultOrNullableType
+import org.jetbrains.kotlin.ir.util.isNullConst
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 
 /**
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/CallableReferenceLowering.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/CallableReferenceLowering.kt
index d19fd77e345..41234fd9f76 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/CallableReferenceLowering.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/CallableReferenceLowering.kt
@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.backend.konan.lower
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
 import org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext
 import org.jetbrains.kotlin.backend.common.descriptors.*
-import org.jetbrains.kotlin.backend.common.ir.copyTo
+import org.jetbrains.kotlin.backend.common.ir.*
 import org.jetbrains.kotlin.backend.common.lower.*
 import org.jetbrains.kotlin.backend.konan.Context
 import org.jetbrains.kotlin.backend.konan.descriptors.synthesizedName
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InitializersLowering.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InitializersLowering.kt
index ab480b784b7..e3c00165fbc 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InitializersLowering.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InitializersLowering.kt
@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.backend.konan.lower
 import org.jetbrains.kotlin.backend.common.ClassLoweringPass
 import org.jetbrains.kotlin.backend.common.CommonBackendContext
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
+import org.jetbrains.kotlin.backend.common.ir.createDispatchReceiverParameter
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.common.lower.irBlockBody
 import org.jetbrains.kotlin.backend.konan.descriptors.synthesizedName
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
index b28b3a9a551..0f831d3eb48 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
@@ -6,6 +6,8 @@
 package org.jetbrains.kotlin.backend.konan.lower
 
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
+import org.jetbrains.kotlin.backend.common.ir.createDispatchReceiverParameter
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.common.lower.*
 import org.jetbrains.kotlin.backend.common.peek
 import org.jetbrains.kotlin.backend.common.pop
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/TestProcessor.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/TestProcessor.kt
index 5bb11586aa6..03f0aaf6790 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/TestProcessor.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/TestProcessor.kt
@@ -8,6 +8,10 @@ package org.jetbrains.kotlin.backend.konan.lower
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedClassConstructorDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedClassDescriptor
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
+import org.jetbrains.kotlin.backend.common.ir.addFakeOverrides
+import org.jetbrains.kotlin.backend.common.ir.createDispatchReceiverParameter
+import org.jetbrains.kotlin.backend.common.ir.createParameterDeclarations
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.common.reportWarning
 import org.jetbrains.kotlin.backend.konan.Context
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt
index ecf9d5805c9..77fc20f4d5f 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt
@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.backend.konan.optimizations
 
 import org.jetbrains.kotlin.backend.common.atMostOne
 import org.jetbrains.kotlin.backend.common.ir.ir2stringWhole
+import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.common.peek
 import org.jetbrains.kotlin.backend.common.pop
 import org.jetbrains.kotlin.backend.common.push
@@ -25,6 +26,9 @@ import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.util.constructors
+import org.jetbrains.kotlin.ir.util.getArguments
+import org.jetbrains.kotlin.ir.util.parentAsClass
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt
index 912ed3e985b..11ae0539121 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt
@@ -20,7 +20,6 @@ import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.ParameterDescriptor
-import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptorImpl
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.ir.IrElement
@@ -90,219 +89,6 @@ internal fun IrFile.addTopLevelInitializer(expression: IrExpression, context: Ko
     addChild(irField)
 }
 
-fun IrClass.addFakeOverrides(symbolTable: SymbolTable) {
-
-    val startOffset = this.startOffset
-    val endOffset = this.endOffset
-
-    descriptor.unsubstitutedMemberScope.getContributedDescriptors()
-            .filterIsInstance<CallableMemberDescriptor>()
-            .filter { it.kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE }
-            .forEach {
-                this.addChild(createFakeOverride(it, startOffset, endOffset, symbolTable))
-            }
-}
-
-private fun createFakeOverride(
-        descriptor: CallableMemberDescriptor,
-        startOffset: Int,
-        endOffset: Int,
-        symbolTable: SymbolTable
-): IrDeclaration {
-
-    fun FunctionDescriptor.createFunction(): IrSimpleFunction = IrFunctionImpl(
-            startOffset, endOffset,
-            IrDeclarationOrigin.FAKE_OVERRIDE,
-            this,
-            symbolTable.translateErased(this@createFunction.returnType!!)
-    ).apply {
-        createParameterDeclarations(symbolTable)
-    }
-
-    return when (descriptor) {
-        is FunctionDescriptor -> descriptor.createFunction()
-        is PropertyDescriptor ->
-            IrPropertyImpl(startOffset, endOffset, IrDeclarationOrigin.FAKE_OVERRIDE, descriptor).apply {
-                // TODO: add field if getter is missing?
-                getter = descriptor.getter?.createFunction()
-                setter = descriptor.setter?.createFunction()
-            }
-        else -> TODO(descriptor.toString())
-    }
-}
-
-fun IrFunction.createParameterDeclarations(symbolTable: SymbolTable) {
-
-    fun ParameterDescriptor.irValueParameter() = IrValueParameterImpl(
-            innerStartOffset(this), innerEndOffset(this),
-            IrDeclarationOrigin.DEFINED,
-            this, symbolTable.translateErased(this.type),
-            (this as? ValueParameterDescriptor)?.varargElementType?.let { symbolTable.translateErased(it) }
-    ).also {
-        it.parent = this@createParameterDeclarations
-    }
-
-    dispatchReceiverParameter = descriptor.dispatchReceiverParameter?.irValueParameter()
-    extensionReceiverParameter = descriptor.extensionReceiverParameter?.irValueParameter()
-
-    assert(valueParameters.isEmpty())
-    descriptor.valueParameters.mapTo(valueParameters) { it.irValueParameter() }
-
-    assert(typeParameters.isEmpty())
-    descriptor.typeParameters.mapTo(typeParameters) {
-        IrTypeParameterImpl(
-                innerStartOffset(it), innerEndOffset(it),
-                IrDeclarationOrigin.DEFINED,
-                it
-        ).also { typeParameter ->
-            typeParameter.parent = this
-            typeParameter.descriptor.upperBounds.mapTo(typeParameter.superTypes, symbolTable::translateErased)
-        }
-    }
-}
-
-fun IrSimpleFunction.setOverrides(symbolTable: ReferenceSymbolTable) {
-    assert(this.overriddenSymbols.isEmpty())
-
-    this.descriptor.overriddenDescriptors.mapTo(this.overriddenSymbols) {
-        symbolTable.referenceSimpleFunction(it.original)
-    }
-}
-
-fun IrClass.createParameterDeclarations(symbolTable: SymbolTable) {
-    this.descriptor.declaredTypeParameters.mapTo(this.typeParameters) {
-        IrTypeParameterImpl(startOffset, endOffset, IrDeclarationOrigin.DEFINED, it).apply {
-            it.upperBounds.mapTo(this.superTypes, symbolTable::translateErased)
-        }
-    }
-
-    this.thisReceiver = IrValueParameterImpl(
-            startOffset, endOffset,
-            IrDeclarationOrigin.DEFINED,
-            this.descriptor.thisAsReceiverParameter,
-            this.symbol.typeWith(this.typeParameters.map { it.defaultType }),
-            null
-    )
-}
-
-fun IrClass.setSuperSymbols(symbolTable: ReferenceSymbolTable) {
-    assert(this.superTypes.isEmpty())
-    this.descriptor.typeConstructor.supertypes.mapTo(this.superTypes) { symbolTable.translateErased(it) }
-
-    this.simpleFunctions().forEach {
-        it.setOverrides(symbolTable)
-    }
-}
-
-fun IrClass.simpleFunctions() = declarations.flatMap {
-    when (it) {
-        is IrSimpleFunction -> listOf(it)
-        is IrProperty -> listOfNotNull(it.getter, it.setter)
-        else -> emptyList()
-    }
-}
-
-fun IrClass.createParameterDeclarations() {
-    assert (thisReceiver == null)
-
-    thisReceiver = WrappedReceiverParameterDescriptor().let {
-        IrValueParameterImpl(
-                startOffset, endOffset,
-                IrDeclarationOrigin.INSTANCE_RECEIVER,
-                IrValueParameterSymbolImpl(it),
-                Name.special("<this>"),
-                0,
-                symbol.typeWith(typeParameters.map { it.defaultType }),
-                null,
-                false,
-                false
-        ).apply {
-            it.bind(this)
-            parent = this@createParameterDeclarations
-        }
-    }
-}
-
-fun IrFunction.createDispatchReceiverParameter(origin: IrDeclarationOrigin? = null) {
-    assert(dispatchReceiverParameter == null)
-
-    dispatchReceiverParameter = IrValueParameterImpl(
-            startOffset, endOffset,
-            origin ?: parentAsClass.origin,
-            IrValueParameterSymbolImpl(parentAsClass.thisReceiver!!.descriptor),
-            Name.special("<this>"),
-            0,
-            parentAsClass.defaultType,
-            null,
-            false,
-            false
-    ).apply {
-        parent = this@createDispatchReceiverParameter
-    }
-}
-
-fun IrClass.addFakeOverrides() {
-    fun IrDeclaration.toList() = when (this) {
-        is IrSimpleFunction -> listOf(this)
-        is IrProperty -> listOfNotNull(getter, setter)
-        else -> emptyList()
-    }
-
-    val overriddenFunctions = declarations
-            .flatMap { it.toList() }
-            .flatMap { it.overriddenSymbols.map { it.owner } }
-            .toSet()
-
-    val unoverriddenSuperFunctions = superTypes
-            .map { it.getClass()!! }
-            .flatMap { irClass ->
-                irClass.declarations
-                        .flatMap { it.toList() }
-                        .filter { it !in overriddenFunctions }
-            }
-            .toMutableSet()
-
-    // TODO: A dirty hack.
-    val groupedUnoverriddenSuperFunctions = unoverriddenSuperFunctions.groupBy { it.name.asString() + it.allParameters.size }
-
-    fun createFakeOverride(overriddenFunctions: List<IrSimpleFunction>) =
-            overriddenFunctions.first().let { irFunction ->
-                val descriptor = WrappedSimpleFunctionDescriptor()
-                IrFunctionImpl(
-                        UNDEFINED_OFFSET,
-                        UNDEFINED_OFFSET,
-                        IrDeclarationOrigin.FAKE_OVERRIDE,
-                        IrSimpleFunctionSymbolImpl(descriptor),
-                        irFunction.name,
-                        Visibilities.INHERITED,
-                        Modality.OPEN,
-                        irFunction.returnType,
-                        irFunction.isInline,
-                        irFunction.isExternal,
-                        irFunction.isTailrec,
-                        irFunction.isSuspend
-                ).apply {
-                    descriptor.bind(this)
-                    parent = this@addFakeOverrides
-                    overriddenSymbols += overriddenFunctions.map { it.symbol }
-                    copyParameterDeclarationsFrom(irFunction)
-                }
-            }
-
-    val fakeOverriddenFunctions = groupedUnoverriddenSuperFunctions
-            .asSequence()
-            .associate { it.value.first() to createFakeOverride(it.value) }
-            .toMutableMap()
-
-    declarations += fakeOverriddenFunctions.values
-}
-
-private fun IrElement.innerStartOffset(descriptor: DeclarationDescriptorWithSource): Int =
-        descriptor.startOffset ?: this.startOffset
-
-private fun IrElement.innerEndOffset(descriptor: DeclarationDescriptorWithSource): Int =
-        descriptor.endOffset ?: this.endOffset
-
 inline fun <reified T> stub(name: String): T {
     return Proxy.newProxyInstance(T::class.java.classLoader, arrayOf(T::class.java)) {
         _ /* proxy */, method, _ /* methodArgs */ ->