From f0e890797a3f46a9f09d698a5f32daba35c2d631 Mon Sep 17 00:00:00 2001
From: Dmitry Jemerov <yole@jetbrains.com>
Date: Sat, 28 Jan 2017 18:32:34 +0100
Subject: [PATCH] Disable "Create type alias from usage" fix when language
 level doesn't support type aliases  #KT-16036 Fixed

---
 .../CreateTypeAliasFromTypeReferenceActionFactory.kt         | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/createTypeAlias/CreateTypeAliasFromTypeReferenceActionFactory.kt b/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/createTypeAlias/CreateTypeAliasFromTypeReferenceActionFactory.kt
index c01b1480cc4..c552e5f539a 100644
--- a/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/createTypeAlias/CreateTypeAliasFromTypeReferenceActionFactory.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/createTypeAlias/CreateTypeAliasFromTypeReferenceActionFactory.kt
@@ -16,17 +16,17 @@
 
 package org.jetbrains.kotlin.idea.quickfix.createFromUsage.createTypeAlias
 
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.idea.core.CollectingNameValidator
 import org.jetbrains.kotlin.idea.core.KotlinNameSuggester
 import org.jetbrains.kotlin.idea.core.NewDeclarationNameValidator
+import org.jetbrains.kotlin.idea.project.languageVersionSettings
 import org.jetbrains.kotlin.idea.quickfix.IntentionActionPriority
 import org.jetbrains.kotlin.idea.quickfix.KotlinSingleIntentionActionFactoryWithDelegate
 import org.jetbrains.kotlin.idea.quickfix.createFromUsage.createClass.CreateClassFromTypeReferenceActionFactory
 import org.jetbrains.kotlin.idea.quickfix.createFromUsage.createClass.getTypeConstraintInfo
-import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtDeclaration
-import org.jetbrains.kotlin.psi.KtFunction
 import org.jetbrains.kotlin.psi.KtUserType
 import org.jetbrains.kotlin.psi.psiUtil.getParentOfTypeAndBranch
 import org.jetbrains.kotlin.types.typeUtil.containsError
@@ -36,6 +36,7 @@ object CreateTypeAliasFromTypeReferenceActionFactory : KotlinSingleIntentionActi
 
     override fun extractFixData(element: KtUserType, diagnostic: Diagnostic): TypeAliasInfo? {
         if (element.getParentOfTypeAndBranch<KtUserType>(true) { qualifier } != null) return null
+        if (!element.languageVersionSettings.supportsFeature(LanguageFeature.TypeAliases)) return null
 
         val classInfo = CreateClassFromTypeReferenceActionFactory.extractFixData(element, diagnostic) ?: return null
         if (classInfo.targetParent is KtDeclaration) return null