Report if the widget has an invalid type

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/KotlinCoreEnvironment.kt

@@ -71,6 +71,7 @@ import org.jetbrains.kotlin.config.CommonConfigurationKeys
 import org.jetbrains.kotlin.config.CompilerConfiguration
 import org.jetbrains.kotlin.config.kotlinSourceRoots
 import org.jetbrains.kotlin.extensions.ExternalDeclarationsProvider
+import org.jetbrains.kotlin.extensions.StorageComponentContainerContributor
 import org.jetbrains.kotlin.idea.JetFileType
 import org.jetbrains.kotlin.load.kotlin.JvmVirtualFileFinderFactory
 import org.jetbrains.kotlin.load.kotlin.KotlinBinaryClassCache
@@ -144,6 +145,7 @@ public class KotlinCoreEnvironment private constructor(
         ExpressionCodegenExtension.registerExtensionPoint(project)
         ClassBuilderInterceptorExtension.registerExtensionPoint(project)
         AnalysisCompletedHandlerExtension.registerExtensionPoint(project)
+        StorageComponentContainerContributor.registerExtensionPoint(project)
 
         for (registrar in configuration.getList(ComponentRegistrar.PLUGIN_COMPONENT_REGISTRARS)) {
             registrar.registerProjectComponents(project, configuration)

compiler/frontend/src/org/jetbrains/kotlin/extensions/StorageComponentContainerContributor.kt

@@ -0,0 +1,28 @@
+/*
+ * 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.extensions
+
+import org.jetbrains.kotlin.container.StorageComponentContainer
+import org.jetbrains.kotlin.resolve.TargetPlatform
+
+public interface StorageComponentContainerContributor {
+    companion object : ProjectExtensionDescriptor<StorageComponentContainerContributor>(
+            "org.jetbrains.kotlin.storageComponentContainerContributor", javaClass<StorageComponentContainerContributor>()
+    )
+
+    public fun addDeclarations(container: StorageComponentContainer, platform: TargetPlatform)
+}

compiler/frontend/src/org/jetbrains/kotlin/frontend/di/injection.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.container.*
 import org.jetbrains.kotlin.context.LazyResolveToken
 import org.jetbrains.kotlin.context.ModuleContext
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.extensions.StorageComponentContainerContributor
 import org.jetbrains.kotlin.incremental.components.LookupTracker
 import org.jetbrains.kotlin.resolve.*
 import org.jetbrains.kotlin.resolve.lazy.FileScopeProvider
@@ -42,6 +43,10 @@ public fun StorageComponentContainer.configureModule(
     useInstance(platform)
 
     platform.platformConfigurator.configure(this)
+
+    for (extension in StorageComponentContainerContributor.getInstances(moduleContext.project)) {
+        extension.addDeclarations(this, platform)
+    }
 }
 
 public fun StorageComponentContainer.configureModule(