[KT-4124] Add support for simple nested classes

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/JsPlatformConfigurator.kt

@@ -28,7 +28,7 @@ import org.jetbrains.kotlin.types.DynamicTypesAllowed
 
 object JsPlatformConfigurator : PlatformConfigurator(
         DynamicTypesAllowed(),
-        additionalDeclarationCheckers = listOf(NativeInvokeChecker(), NativeGetterChecker(), NativeSetterChecker(), ClassDeclarationChecker()),
+        additionalDeclarationCheckers = listOf(NativeInvokeChecker(), NativeGetterChecker(), NativeSetterChecker()),
         additionalCallCheckers = listOf(),
         additionalTypeCheckers = listOf(),
         additionalSymbolUsageValidators = listOf(),

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/unsupportedFeatureCheckers.kt

@@ -1,50 +0,0 @@
-/*
- * Copyright 2010-2015 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.kotlin.js.resolve
-
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
-import org.jetbrains.kotlin.descriptors.DeclarationDescriptorWithVisibility
-import org.jetbrains.kotlin.descriptors.Visibilities
-import org.jetbrains.kotlin.diagnostics.DiagnosticSink
-import org.jetbrains.kotlin.diagnostics.rendering.renderKind
-import org.jetbrains.kotlin.diagnostics.rendering.renderKindWithName
-import org.jetbrains.kotlin.js.resolve.diagnostics.ErrorsJs
-import org.jetbrains.kotlin.js.translate.utils.AnnotationsUtils
-import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.resolve.BindingContext
-import org.jetbrains.kotlin.resolve.DeclarationChecker
-import org.jetbrains.kotlin.resolve.DescriptorUtils
-
-class ClassDeclarationChecker : DeclarationChecker {
-    override fun check(
-            declaration: KtDeclaration,
-            descriptor: DeclarationDescriptor,
-            diagnosticHolder: DiagnosticSink,
-            bindingContext: BindingContext
-    ) {
-        if (declaration !is KtClassOrObject || declaration is KtObjectDeclaration || declaration is KtEnumEntry) return
-
-        // hack to avoid to get diagnostics when compile kotlin builtins
-        val fqNameUnsafe = DescriptorUtils.getFqName(descriptor)
-        if (fqNameUnsafe.asString().startsWith("kotlin.")) return
-
-        if (!DescriptorUtils.isTopLevelDeclaration(descriptor) && !AnnotationsUtils.isNativeObject(descriptor)) {
-            diagnosticHolder.report(ErrorsJs.NON_TOPLEVEL_CLASS_DECLARATION.on(declaration, (descriptor as ClassDescriptor).renderKind()))
-        }
-    }
-}