diff --git a/compiler/backend-common/src/org/jetbrains/kotlin/backend/common/CodegenUtil.java b/compiler/backend-common/src/org/jetbrains/kotlin/backend/common/CodegenUtil.java
index 6d894206dcd..0ae486ce0fe 100644
--- a/compiler/backend-common/src/org/jetbrains/kotlin/backend/common/CodegenUtil.java
+++ b/compiler/backend-common/src/org/jetbrains/kotlin/backend/common/CodegenUtil.java
@@ -50,7 +50,7 @@ public class CodegenUtil {
             @NotNull ClassifierDescriptor returnedClassifier,
             @NotNull ClassifierDescriptor... valueParameterClassifiers
     ) {
-        Collection<FunctionDescriptor> functions = owner.getDefaultType().getMemberScope().getContributedFunctions(name, NoLookupLocation.FROM_BACKEND);
+        Collection<SimpleFunctionDescriptor> functions = owner.getDefaultType().getMemberScope().getContributedFunctions(name, NoLookupLocation.FROM_BACKEND);
         for (FunctionDescriptor function : functions) {
             if (!CallResolverUtilKt.isOrOverridesSynthesized(function)
                 && function.getTypeParameters().isEmpty()
diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java b/compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java
index ae09bdafc46..321dcbb852f 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java
@@ -413,7 +413,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
     }
 
     private boolean isGenericToArrayPresent() {
-        Collection<FunctionDescriptor> functions =
+        Collection<SimpleFunctionDescriptor> functions =
                 descriptor.getDefaultType().getMemberScope().getContributedFunctions(Name.identifier("toArray"), NoLookupLocation.FROM_BACKEND);
         for (FunctionDescriptor function : functions) {
             if (CallResolverUtilKt.isOrOverridesSynthesized(function)) {
diff --git a/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/kotlinSignature/SignaturesPropagationData.java b/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/kotlinSignature/SignaturesPropagationData.java
index d167592b365..e484611b83a 100644
--- a/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/kotlinSignature/SignaturesPropagationData.java
+++ b/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/kotlinSignature/SignaturesPropagationData.java
@@ -203,7 +203,7 @@ public class SignaturesPropagationData {
         Method autoSignature = null;
         boolean autoMethodContainsVararg = SignaturePropagationUtilKt.containsVarargs(autoMethodDescriptor);
         for (KotlinType supertype : containingClass.getTypeConstructor().getSupertypes()) {
-            Collection<FunctionDescriptor> superFunctionCandidates =
+            Collection<SimpleFunctionDescriptor> superFunctionCandidates =
                     supertype.getMemberScope().getContributedFunctions(name, NoLookupLocation.WHEN_GET_SUPER_MEMBERS);
 
             if (!autoMethodContainsVararg && !SignaturePropagationUtilKt.containsAnyNotTrivialSignature(superFunctionCandidates)) continue;
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tasks/dynamicCalls.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tasks/dynamicCalls.kt
index 44af44ad0f6..cdc99924c7a 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tasks/dynamicCalls.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tasks/dynamicCalls.kt
@@ -46,7 +46,7 @@ class DynamicCallableDescriptors(private val builtIns: KotlinBuiltIns) {
             p.println(javaClass.simpleName, ": dynamic candidates for " + call)
         }
 
-        override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> {
+        override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> {
             if (isAugmentedAssignmentConvention(name)) return listOf()
             if (call.callType == Call.CallType.INVOKE
                 && call.valueArgumentList == null && call.functionLiteralArguments.isEmpty()) {
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/AbstractLazyMemberScope.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/AbstractLazyMemberScope.kt
index 30e6593fe41..907e67dc95a 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/AbstractLazyMemberScope.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/AbstractLazyMemberScope.kt
@@ -17,10 +17,7 @@
 package org.jetbrains.kotlin.resolve.lazy.descriptors
 
 import com.google.common.collect.Sets
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
-import org.jetbrains.kotlin.descriptors.FunctionDescriptor
-import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.incremental.components.LookupLocation
 import org.jetbrains.kotlin.incremental.record
 import org.jetbrains.kotlin.name.Name
@@ -49,7 +46,7 @@ protected constructor(
 
     protected val storageManager: StorageManager = c.storageManager
     private val classDescriptors: MemoizedFunctionToNotNull<Name, List<ClassDescriptor>> = storageManager.createMemoizedFunction { resolveClassDescriptor(it) }
-    private val functionDescriptors: MemoizedFunctionToNotNull<Name, Collection<FunctionDescriptor>> = storageManager.createMemoizedFunction { doGetFunctions(it) }
+    private val functionDescriptors: MemoizedFunctionToNotNull<Name, Collection<SimpleFunctionDescriptor>> = storageManager.createMemoizedFunction { doGetFunctions(it) }
     private val propertyDescriptors: MemoizedFunctionToNotNull<Name, Collection<PropertyDescriptor>> = storageManager.createMemoizedFunction { doGetProperties(it) }
 
     private fun resolveClassDescriptor(name: Name): List<ClassDescriptor> {
@@ -66,13 +63,13 @@ protected constructor(
         return classDescriptors(name).firstOrNull()
     }
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> {
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> {
         recordLookup(name, location)
         return functionDescriptors(name)
     }
 
-    private fun doGetFunctions(name: Name): Collection<FunctionDescriptor> {
-        val result = Sets.newLinkedHashSet<FunctionDescriptor>()
+    private fun doGetFunctions(name: Name): Collection<SimpleFunctionDescriptor> {
+        val result = Sets.newLinkedHashSet<SimpleFunctionDescriptor>()
 
         val declarations = declarationProvider.getFunctionDeclarations(name)
         for (functionDeclaration in declarations) {
@@ -92,7 +89,7 @@ protected constructor(
 
     protected abstract fun getScopeForMemberDeclarationResolution(declaration: KtDeclaration): LexicalScope
 
-    protected abstract fun getNonDeclaredFunctions(name: Name, result: MutableSet<FunctionDescriptor>)
+    protected abstract fun getNonDeclaredFunctions(name: Name, result: MutableSet<SimpleFunctionDescriptor>)
 
     override fun getContributedVariables(name: Name, location: LookupLocation): Collection<PropertyDescriptor> {
         recordLookup(name, location)
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyClassMemberScope.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyClassMemberScope.kt
index d9beb6de3ce..99457e76bf7 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyClassMemberScope.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyClassMemberScope.kt
@@ -120,26 +120,26 @@ open class LazyClassMemberScope(
         OverrideResolver.resolveUnknownVisibilities(result, trace)
     }
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> {
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> {
         // TODO: this should be handled by lazy function descriptors
         val functions = super.getContributedFunctions(name, location)
         resolveUnknownVisibilitiesForMembers(functions)
         return functions
     }
 
-    override fun getNonDeclaredFunctions(name: Name, result: MutableSet<FunctionDescriptor>) {
+    override fun getNonDeclaredFunctions(name: Name, result: MutableSet<SimpleFunctionDescriptor>) {
         val location = NoLookupLocation.FOR_ALREADY_TRACKED
 
-        val fromSupertypes = Lists.newArrayList<FunctionDescriptor>()
+        val fromSupertypes = Lists.newArrayList<SimpleFunctionDescriptor>()
         for (supertype in thisDescriptor.typeConstructor.supertypes) {
             fromSupertypes.addAll(supertype.memberScope.getContributedFunctions(name, location))
         }
         result.addAll(generateDelegatingDescriptors(name, EXTRACT_FUNCTIONS, result))
         generateDataClassMethods(result, name, location)
-        generateFakeOverrides(name, fromSupertypes, result, FunctionDescriptor::class.java)
+        generateFakeOverrides(name, fromSupertypes, result, SimpleFunctionDescriptor::class.java)
     }
 
-    private fun generateDataClassMethods(result: MutableCollection<FunctionDescriptor>, name: Name, location: LookupLocation) {
+    private fun generateDataClassMethods(result: MutableCollection<SimpleFunctionDescriptor>, name: Name, location: LookupLocation) {
         if (!thisDescriptor.isData) return
 
         val constructor = getPrimaryConstructor() ?: return
@@ -319,8 +319,8 @@ open class LazyClassMemberScope(
     override fun toString() = "lazy scope for class ${thisDescriptor.name}"
 
     companion object {
-        private val EXTRACT_FUNCTIONS: MemberExtractor<FunctionDescriptor> = object : MemberExtractor<FunctionDescriptor> {
-            override fun extract(extractFrom: KotlinType, name: Name): Collection<FunctionDescriptor> {
+        private val EXTRACT_FUNCTIONS: MemberExtractor<SimpleFunctionDescriptor> = object : MemberExtractor<SimpleFunctionDescriptor> {
+            override fun extract(extractFrom: KotlinType, name: Name): Collection<SimpleFunctionDescriptor> {
                 return extractFrom.memberScope.getContributedFunctions(name, NoLookupLocation.FOR_ALREADY_TRACKED)
             }
         }
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyPackageMemberScope.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyPackageMemberScope.kt
index b7b95b0b119..537c1b0b9c7 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyPackageMemberScope.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyPackageMemberScope.kt
@@ -37,7 +37,7 @@ class LazyPackageMemberScope(
     override fun getScopeForMemberDeclarationResolution(declaration: KtDeclaration)
             = resolveSession.fileScopeProvider.getFileResolutionScope(declaration.getContainingKtFile())
 
-    override fun getNonDeclaredFunctions(name: Name, result: MutableSet<FunctionDescriptor>) {
+    override fun getNonDeclaredFunctions(name: Name, result: MutableSet<SimpleFunctionDescriptor>) {
         // No extra functions
     }
 
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/DataFlowAnalyzer.java b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/DataFlowAnalyzer.java
index 0b4c170e3bf..ef6a899e22a 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/DataFlowAnalyzer.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/DataFlowAnalyzer.java
@@ -87,7 +87,7 @@ public class DataFlowAnalyzer {
     }
 
     private static boolean typeHasOverriddenEquals(@NotNull KotlinType type, @NotNull KtElement lookupElement) {
-        Collection<FunctionDescriptor> members = type.getMemberScope().getContributedFunctions(
+        Collection<SimpleFunctionDescriptor> members = type.getMemberScope().getContributedFunctions(
                 OperatorNameConventions.EQUALS, new KotlinLookupLocation(lookupElement));
         for (FunctionDescriptor member : members) {
             KotlinType returnType = member.getReturnType();
diff --git a/compiler/tests/org/jetbrains/kotlin/resolve/annotation/AbstractAnnotationDescriptorResolveTest.java b/compiler/tests/org/jetbrains/kotlin/resolve/annotation/AbstractAnnotationDescriptorResolveTest.java
index b9c6486986b..870a50f3575 100644
--- a/compiler/tests/org/jetbrains/kotlin/resolve/annotation/AbstractAnnotationDescriptorResolveTest.java
+++ b/compiler/tests/org/jetbrains/kotlin/resolve/annotation/AbstractAnnotationDescriptorResolveTest.java
@@ -169,7 +169,7 @@ public abstract class AbstractAnnotationDescriptorResolveTest extends KotlinTest
     protected static FunctionDescriptor getFunctionDescriptor(@NotNull PackageFragmentDescriptor packageView, @NotNull String name) {
         Name functionName = Name.identifier(name);
         MemberScope memberScope = packageView.getMemberScope();
-        Collection<FunctionDescriptor> functions = memberScope.getContributedFunctions(functionName, NoLookupLocation.FROM_TEST);
+        Collection<SimpleFunctionDescriptor> functions = memberScope.getContributedFunctions(functionName, NoLookupLocation.FROM_TEST);
         assert functions.size() == 1 : "Failed to find function " + functionName + " in class" + "." + packageView.getName();
         return functions.iterator().next();
     }
@@ -178,7 +178,7 @@ public abstract class AbstractAnnotationDescriptorResolveTest extends KotlinTest
     private static FunctionDescriptor getFunctionDescriptor(@NotNull ClassDescriptor classDescriptor, @NotNull String name) {
         Name functionName = Name.identifier(name);
         MemberScope memberScope = classDescriptor.getMemberScope(Collections.<TypeProjection>emptyList());
-        Collection<FunctionDescriptor> functions = memberScope.getContributedFunctions(functionName, NoLookupLocation.FROM_TEST);
+        Collection<SimpleFunctionDescriptor> functions = memberScope.getContributedFunctions(functionName, NoLookupLocation.FROM_TEST);
         assert functions.size() == 1 : "Failed to find function " + functionName + " in class" + "." + classDescriptor.getName();
         return functions.iterator().next();
     }
diff --git a/compiler/tests/org/jetbrains/kotlin/types/BoundsSubstitutorTest.java b/compiler/tests/org/jetbrains/kotlin/types/BoundsSubstitutorTest.java
index 0883fc088cb..785ea39577e 100644
--- a/compiler/tests/org/jetbrains/kotlin/types/BoundsSubstitutorTest.java
+++ b/compiler/tests/org/jetbrains/kotlin/types/BoundsSubstitutorTest.java
@@ -20,6 +20,7 @@ import com.intellij.util.containers.ContainerUtil;
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment;
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor;
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor;
+import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor;
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation;
 import org.jetbrains.kotlin.name.FqName;
 import org.jetbrains.kotlin.name.Name;
@@ -72,7 +73,7 @@ public class BoundsSubstitutorTest extends KotlinTestWithEnvironment {
     private void doTest(String text, String expected) {
         KtFile jetFile = KtPsiFactoryKt.KtPsiFactory(getProject()).createFile("fun.kt", text);
         ModuleDescriptor module = LazyResolveTestUtil.resolveLazily(Collections.singletonList(jetFile), getEnvironment());
-        Collection<FunctionDescriptor> functions =
+        Collection<SimpleFunctionDescriptor> functions =
                 module.getPackage(FqName.ROOT).getMemberScope().getContributedFunctions(Name.identifier("f"), NoLookupLocation.FROM_TEST);
         assert functions.size() == 1 : "Many functions defined";
         FunctionDescriptor function = ContainerUtil.getFirstItem(functions);
diff --git a/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaPackageScope.kt b/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaPackageScope.kt
index 534f4ccb46c..bf071940701 100644
--- a/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaPackageScope.kt
+++ b/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaPackageScope.kt
@@ -138,7 +138,7 @@ class LazyJavaPackageScope(
         return deserializedPackageScope.getContributedVariables(name, NoLookupLocation.FOR_ALREADY_TRACKED)
     }
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): List<FunctionDescriptor> {
+    override fun getContributedFunctions(name: Name, location: LookupLocation): List<SimpleFunctionDescriptor> {
         // We should track lookups here because this scope can be used for kotlin packages too (if it doesn't contain toplevel properties nor functions).
         recordLookup(name, location)
         return deserializedPackageScope.getContributedFunctions(name, NoLookupLocation.FOR_ALREADY_TRACKED) + super.getContributedFunctions(name, NoLookupLocation.FOR_ALREADY_TRACKED)
diff --git a/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaScope.kt b/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaScope.kt
index 0488f9390c8..73e7478daf6 100644
--- a/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaScope.kt
+++ b/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaScope.kt
@@ -72,7 +72,7 @@ abstract class LazyJavaScope(protected val c: LazyJavaResolverContext) : MemberS
 
     protected abstract fun getDispatchReceiverParameter(): ReceiverParameterDescriptor?
 
-    private val functions = c.storageManager.createMemoizedFunction<Name, Collection<FunctionDescriptor>> {
+    private val functions = c.storageManager.createMemoizedFunction<Name, Collection<SimpleFunctionDescriptor>> {
         name ->
         val result = LinkedHashSet<SimpleFunctionDescriptor>()
 
@@ -214,7 +214,7 @@ abstract class LazyJavaScope(protected val c: LazyJavaResolverContext) : MemberS
         return ResolvedValueParameters(descriptors, synthesizedNames)
     }
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> {
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> {
         recordLookup(name, location)
         return functions(name)
     }
diff --git a/core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionClassScope.kt b/core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionClassScope.kt
index 546ed4b9508..4f54bccde4f 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionClassScope.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionClassScope.kt
@@ -48,8 +48,8 @@ class FunctionClassScope(
         return allDescriptors()
     }
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> {
-        return allDescriptors().filterIsInstance<FunctionDescriptor>().filter { it.name == name }
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> {
+        return allDescriptors().filterIsInstance<SimpleFunctionDescriptor>().filter { it.name == name }
     }
 
     override fun getContributedVariables(name: Name, location: LookupLocation): Collection<PropertyDescriptor> {
diff --git a/core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/EnumEntrySyntheticClassDescriptor.java b/core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/EnumEntrySyntheticClassDescriptor.java
index b02222aac96..e511bc8bc86 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/EnumEntrySyntheticClassDescriptor.java
+++ b/core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/EnumEntrySyntheticClassDescriptor.java
@@ -178,14 +178,14 @@ public class EnumEntrySyntheticClassDescriptor extends ClassDescriptorBase {
     }
 
     private class EnumEntryScope extends MemberScopeImpl {
-        private final MemoizedFunctionToNotNull<Name, Collection<FunctionDescriptor>> functions;
+        private final MemoizedFunctionToNotNull<Name, Collection<SimpleFunctionDescriptor>> functions;
         private final MemoizedFunctionToNotNull<Name, Collection<PropertyDescriptor>> properties;
         private final NotNullLazyValue<Collection<DeclarationDescriptor>> allDescriptors;
 
         public EnumEntryScope(@NotNull StorageManager storageManager) {
-            this.functions = storageManager.createMemoizedFunction(new Function1<Name, Collection<FunctionDescriptor>>() {
+            this.functions = storageManager.createMemoizedFunction(new Function1<Name, Collection<SimpleFunctionDescriptor>>() {
                 @Override
-                public Collection<FunctionDescriptor> invoke(Name name) {
+                public Collection<SimpleFunctionDescriptor> invoke(Name name) {
                     return computeFunctions(name);
                 }
             });
@@ -206,25 +206,32 @@ public class EnumEntrySyntheticClassDescriptor extends ClassDescriptorBase {
 
         @NotNull
         @Override
-        @SuppressWarnings({"unchecked"}) // KT-9898 Impossible implement kotlin interface in java
+        // TODO: Convert to Kotlin or add @JvmWildcard to MemberScope declarations
+        // method is covariantly overridden in Kotlin, but collections in Java are invariant
+        @SuppressWarnings({"unchecked"})
         public Collection getContributedVariables(@NotNull Name name, @NotNull LookupLocation location) {
             return properties.invoke(name);
         }
 
         @NotNull
-        @SuppressWarnings("unchecked")
+        // TODO: Convert to Kotlin or add @JvmWildcard to MemberScope declarations
+        // method is covariantly overridden in Kotlin, but collections in Java are invariant
+        @SuppressWarnings({"unchecked"})
         private Collection<PropertyDescriptor> computeProperties(@NotNull Name name) {
             return resolveFakeOverrides(name, (Collection) getSupertypeScope().getContributedVariables(name, NoLookupLocation.FOR_NON_TRACKED_SCOPE));
         }
 
         @NotNull
         @Override
-        public Collection<FunctionDescriptor> getContributedFunctions(@NotNull Name name, @NotNull LookupLocation location) {
+        // TODO: Convert to Kotlin or add @JvmWildcard to MemberScope declarations
+        // method is covariantly overridden in Kotlin, but collections in Java are invariant
+        @SuppressWarnings({"unchecked"})
+        public Collection getContributedFunctions(@NotNull Name name, @NotNull LookupLocation location) {
             return functions.invoke(name);
         }
 
         @NotNull
-        private Collection<FunctionDescriptor> computeFunctions(@NotNull Name name) {
+        private Collection<SimpleFunctionDescriptor> computeFunctions(@NotNull Name name) {
             return resolveFakeOverrides(name, getSupertypeScope().getContributedFunctions(name, NoLookupLocation.FOR_NON_TRACKED_SCOPE));
         }
 
diff --git a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/AbstractScopeAdapter.kt b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/AbstractScopeAdapter.kt
index 1b54bc79561..bc4b0eb84aa 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/AbstractScopeAdapter.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/AbstractScopeAdapter.kt
@@ -33,7 +33,7 @@ abstract class AbstractScopeAdapter : MemberScope {
             else
                 workerScope
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> {
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> {
         return workerScope.getContributedFunctions(name, location)
     }
 
diff --git a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/ChainedMemberScope.kt b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/ChainedMemberScope.kt
index d03daf3f576..47642a9bc44 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/ChainedMemberScope.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/ChainedMemberScope.kt
@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.resolve.scopes
 import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.kotlin.incremental.components.LookupLocation
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.util.collectionUtils.getFirstMatch
@@ -35,7 +36,7 @@ class ChainedMemberScope(
     override fun getContributedVariables(name: Name, location: LookupLocation): Collection<PropertyDescriptor>
             = getFromAllScopes(scopes) { it.getContributedVariables(name, location) }
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor>
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor>
             = getFromAllScopes(scopes) { it.getContributedFunctions(name, location) }
 
     override fun getContributedDescriptors(kindFilter: DescriptorKindFilter, nameFilter: (Name) -> Boolean)
diff --git a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScope.kt b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScope.kt
index 63afbe5c5fe..174e639fcf6 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScope.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScope.kt
@@ -26,6 +26,7 @@ import java.lang.reflect.Modifier
 interface MemberScope : ResolutionScope {
 
     override fun getContributedVariables(name: Name, location: LookupLocation): Collection<PropertyDescriptor>
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor>
 
     /**
      * Is supposed to be used in tests and debug only
diff --git a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScopeImpl.kt b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScopeImpl.kt
index cd3824693ed..c2cb4db8f62 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScopeImpl.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/MemberScopeImpl.kt
@@ -26,7 +26,7 @@ abstract class MemberScopeImpl : MemberScope {
 
     override fun getContributedVariables(name: Name, location: LookupLocation): Collection<PropertyDescriptor> = emptyList()
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> = emptyList()
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> = emptyList()
 
     override fun getContributedDescriptors(kindFilter: DescriptorKindFilter,
                                            nameFilter: (Name) -> Boolean): Collection<DeclarationDescriptor> = emptyList()
diff --git a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/StaticScopeForKotlinEnum.kt b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/StaticScopeForKotlinEnum.kt
index b1cb10c788b..962362d26f5 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/StaticScopeForKotlinEnum.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/StaticScopeForKotlinEnum.kt
@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.resolve.scopes
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.kotlin.incremental.components.LookupLocation
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.DescriptorFactory.createEnumValueOfMethod
@@ -34,14 +35,14 @@ class StaticScopeForKotlinEnum(private val containingClass: ClassDescriptor) : M
 
     override fun getContributedClassifier(name: Name, location: LookupLocation) = null // TODO
 
-    private val functions: List<FunctionDescriptor> by lazy {
+    private val functions: List<SimpleFunctionDescriptor> by lazy {
         listOf(createEnumValueOfMethod(containingClass), createEnumValuesMethod(containingClass))
     }
 
     override fun getContributedDescriptors(kindFilter: DescriptorKindFilter, nameFilter: (Name) -> Boolean) = functions
 
     override fun getContributedFunctions(name: Name, location: LookupLocation) =
-            functions.filterTo(ArrayList<FunctionDescriptor>(1)) { it.name == name }
+            functions.filterTo(ArrayList<SimpleFunctionDescriptor>(1)) { it.name == name }
 
     override fun printScopeStructure(p: Printer) {
         p.println("Static scope for $containingClass")
diff --git a/core/descriptors/src/org/jetbrains/kotlin/types/ErrorUtils.java b/core/descriptors/src/org/jetbrains/kotlin/types/ErrorUtils.java
index d447fb84282..e7a1e6aaee8 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/types/ErrorUtils.java
+++ b/core/descriptors/src/org/jetbrains/kotlin/types/ErrorUtils.java
@@ -184,15 +184,20 @@ public class ErrorUtils {
 
         @NotNull
         @Override
-        @SuppressWarnings({"unchecked"}) // KT-9898 Impossible implement kotlin interface in java
+        // TODO: Convert to Kotlin or add @JvmWildcard to MemberScope declarations
+        // method is covariantly overridden in Kotlin, but collections in Java are invariant
+        @SuppressWarnings({"unchecked"})
         public Set getContributedVariables(@NotNull Name name, @NotNull LookupLocation location) {
             return ERROR_PROPERTY_GROUP;
         }
 
         @NotNull
         @Override
-        public Set<FunctionDescriptor> getContributedFunctions(@NotNull Name name, @NotNull LookupLocation location) {
-            return Collections.<FunctionDescriptor>singleton(createErrorFunction(this));
+        // TODO: Convert to Kotlin or add @JvmWildcard to MemberScope declarations
+        // method is covariantly overridden in Kotlin, but collections in Java are invariant
+        @SuppressWarnings({"unchecked"})
+        public Set getContributedFunctions(@NotNull Name name, @NotNull LookupLocation location) {
+            return Collections.singleton(createErrorFunction(this));
         }
 
         @NotNull
@@ -236,7 +241,10 @@ public class ErrorUtils {
 
         @NotNull
         @Override
-        public Collection<FunctionDescriptor> getContributedFunctions(@NotNull Name name, @NotNull LookupLocation location) {
+        // TODO: Convert to Kotlin or add @JvmWildcard to MemberScope declarations
+        // method is covariantly overridden in Kotlin, but collections in Java are invariant
+        @SuppressWarnings({"unchecked"})
+        public Collection getContributedFunctions(@NotNull Name name, @NotNull LookupLocation location) {
             throw new IllegalStateException();
         }
 
diff --git a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/MemberDeserializer.kt b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/MemberDeserializer.kt
index 7af87f5bbd2..a4430331d15 100644
--- a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/MemberDeserializer.kt
+++ b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/MemberDeserializer.kt
@@ -139,7 +139,7 @@ class MemberDeserializer(private val c: DeserializationContext) {
         return lowSixBits + rest
     }
 
-    fun loadFunction(proto: ProtoBuf.Function): FunctionDescriptor {
+    fun loadFunction(proto: ProtoBuf.Function): SimpleFunctionDescriptor {
         val flags = if (proto.hasFlags()) proto.flags else loadOldFlags(proto.oldFlags)
         val annotations = getAnnotations(proto, flags, AnnotatedCallableKind.FUNCTION)
         val receiverAnnotations = if (proto.hasReceiver())
diff --git a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedClassDescriptor.kt b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedClassDescriptor.kt
index d3770fcdbf2..3ebfbd23b62 100644
--- a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedClassDescriptor.kt
+++ b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedClassDescriptor.kt
@@ -203,8 +203,8 @@ class DeserializedClassDescriptor(
         override fun getContributedDescriptors(kindFilter: DescriptorKindFilter,
                                                nameFilter: (Name) -> Boolean): Collection<DeclarationDescriptor> = allDescriptors()
 
-        override fun computeNonDeclaredFunctions(name: Name, functions: MutableCollection<FunctionDescriptor>) {
-            val fromSupertypes = ArrayList<FunctionDescriptor>()
+        override fun computeNonDeclaredFunctions(name: Name, functions: MutableCollection<SimpleFunctionDescriptor>) {
+            val fromSupertypes = ArrayList<SimpleFunctionDescriptor>()
             for (supertype in classDescriptor.getTypeConstructor().supertypes) {
                 fromSupertypes.addAll(supertype.memberScope.getContributedFunctions(name, NoLookupLocation.FOR_ALREADY_TRACKED))
             }
diff --git a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedMemberScope.kt b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedMemberScope.kt
index ecb3aa74861..3b20cd68109 100644
--- a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedMemberScope.kt
+++ b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedMemberScope.kt
@@ -48,7 +48,7 @@ abstract class DeserializedMemberScope protected constructor(
             }
 
     private val functions =
-            c.storageManager.createMemoizedFunction<Name, Collection<FunctionDescriptor>> { computeFunctions(it) }
+            c.storageManager.createMemoizedFunction<Name, Collection<SimpleFunctionDescriptor>> { computeFunctions(it) }
     private val properties =
             c.storageManager.createMemoizedFunction<Name, Collection<PropertyDescriptor>> { computeProperties(it) }
 
@@ -63,7 +63,7 @@ abstract class DeserializedMemberScope protected constructor(
         return map
     }
 
-    private fun computeFunctions(name: Name): Collection<FunctionDescriptor> {
+    private fun computeFunctions(name: Name): Collection<SimpleFunctionDescriptor> {
         val protos = functionProtos()[ProtoKey(name, isExtension = false)].orEmpty() +
                      functionProtos()[ProtoKey(name, isExtension = true)].orEmpty()
 
@@ -75,10 +75,10 @@ abstract class DeserializedMemberScope protected constructor(
         return descriptors.toReadOnlyList()
     }
 
-    protected open fun computeNonDeclaredFunctions(name: Name, functions: MutableCollection<FunctionDescriptor>) {
+    protected open fun computeNonDeclaredFunctions(name: Name, functions: MutableCollection<SimpleFunctionDescriptor>) {
     }
 
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<FunctionDescriptor> {
+    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> {
         recordLookup(name, location)
         return functions(name)
     }
diff --git a/js/js.translator/src/org/jetbrains/kotlin/js/translate/utils/ManglingUtils.java b/js/js.translator/src/org/jetbrains/kotlin/js/translate/utils/ManglingUtils.java
index a9a9469cb4f..2f445700c56 100644
--- a/js/js.translator/src/org/jetbrains/kotlin/js/translate/utils/ManglingUtils.java
+++ b/js/js.translator/src/org/jetbrains/kotlin/js/translate/utils/ManglingUtils.java
@@ -244,7 +244,7 @@ public class ManglingUtils {
 
     @NotNull
     public static String getStableMangledNameForDescriptor(@NotNull ClassDescriptor descriptor, @NotNull String functionName) {
-        Collection<FunctionDescriptor> functions =
+        Collection<SimpleFunctionDescriptor> functions =
                 descriptor.getDefaultType().getMemberScope().getContributedFunctions(Name.identifier(functionName), NoLookupLocation.FROM_BACKEND);
         assert functions.size() == 1 : "Can't select a single function: " + functionName + " in " + descriptor;
         return getSuggestedName((DeclarationDescriptor) functions.iterator().next());
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/PredefinedPackageFragmentDescriptor.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/PredefinedPackageFragmentDescriptor.kt
index ee96b5bb833..3d6567233d7 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/PredefinedPackageFragmentDescriptor.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/PredefinedPackageFragmentDescriptor.kt
@@ -16,7 +16,10 @@
 
 package org.jetbrains.kotlin.android.synthetic.descriptors
 
-import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.kotlin.descriptors.impl.PackageFragmentDescriptorImpl
 import org.jetbrains.kotlin.incremental.components.LookupLocation
 import org.jetbrains.kotlin.name.FqName
@@ -31,10 +34,10 @@ class PredefinedPackageFragmentDescriptor(
         module: ModuleDescriptor,
         private val storageManager: StorageManager,
         val subpackages: List<PackageFragmentDescriptor> = emptyList(),
-        private val descriptors: (PredefinedPackageFragmentDescriptor) -> Collection<DeclarationDescriptor> = { emptyList() }
+        private val functions: (PredefinedPackageFragmentDescriptor) -> Collection<SimpleFunctionDescriptor> = { emptyList() }
 ) : PackageFragmentDescriptorImpl(module, FqName(fqName)) {
-    private val calculatedDescriptors = storageManager.createLazyValue {
-        descriptors(this)
+    private val calculatedFunctions = storageManager.createLazyValue {
+        functions(this)
     }
 
     private val scope = PredefinedScope()
@@ -42,15 +45,14 @@ class PredefinedPackageFragmentDescriptor(
 
     inner class PredefinedScope : MemberScopeImpl() {
         @Suppress("UNCHECKED_CAST")
-        override fun getContributedVariables(name: Name, location: LookupLocation) =
-                calculatedDescriptors().filter { it is PropertyDescriptor && it.name == name } as List<PropertyDescriptor>
+        override fun getContributedVariables(name: Name, location: LookupLocation) = emptyList<PropertyDescriptor>()
 
         @Suppress("UNCHECKED_CAST")
         override fun getContributedFunctions(name: Name, location: LookupLocation) =
-                calculatedDescriptors().filter { it is FunctionDescriptor && it.name == name } as List<FunctionDescriptor>
+                calculatedFunctions().filter { it.name == name }
 
         override fun getContributedDescriptors(kindFilter: DescriptorKindFilter, nameFilter: (Name) -> Boolean) =
-                calculatedDescriptors().filter { nameFilter(it.name) && kindFilter.accepts(it) }
+                calculatedFunctions().filter { nameFilter(it.name) && kindFilter.accepts(it) }
 
         override fun printScopeStructure(p: Printer) {
             p.println(javaClass.simpleName)
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt
index 1b794e17919..70851be6140 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt
@@ -34,7 +34,7 @@ import org.jetbrains.kotlin.types.typeUtil.makeNullable
 
 private class XmlSourceElement(override val psi: PsiElement) : PsiSourceElement
 
-internal fun genClearCacheFunction(packageFragmentDescriptor: PackageFragmentDescriptor, receiverType: KotlinType): FunctionDescriptor {
+internal fun genClearCacheFunction(packageFragmentDescriptor: PackageFragmentDescriptor, receiverType: KotlinType): SimpleFunctionDescriptor {
     val function = object : AndroidSyntheticFunction, SimpleFunctionDescriptorImpl(
             packageFragmentDescriptor,
             null,