From 5f455bbe3afb5fa25272141bae982f5da1d7c90e Mon Sep 17 00:00:00 2001
From: Mikhail Glukhikh <Mikhail.Glukhikh@jetbrains.com>
Date: Fri, 27 Jan 2017 17:32:50 +0300
Subject: [PATCH] Do not suggest renaming to underscore in 1.0 compatibility
 mode #KT-16019 Fixed

---
 .../kotlin/idea/quickfix/RenameToUnderscoreFix.kt          | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/idea/src/org/jetbrains/kotlin/idea/quickfix/RenameToUnderscoreFix.kt b/idea/src/org/jetbrains/kotlin/idea/quickfix/RenameToUnderscoreFix.kt
index b780bdbc5c4..914e40b680d 100644
--- a/idea/src/org/jetbrains/kotlin/idea/quickfix/RenameToUnderscoreFix.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/quickfix/RenameToUnderscoreFix.kt
@@ -19,8 +19,10 @@ package org.jetbrains.kotlin.idea.quickfix
 import com.intellij.codeInsight.intention.IntentionAction
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.project.Project
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.diagnostics.Errors
+import org.jetbrains.kotlin.idea.project.languageVersionSettings
 import org.jetbrains.kotlin.psi.*
 
 class RenameToUnderscoreFix(element: KtCallableDeclaration) : KotlinQuickFixAction<KtCallableDeclaration>(element) {
@@ -48,7 +50,10 @@ class RenameToUnderscoreFix(element: KtCallableDeclaration) : KotlinQuickFixActi
                 else -> null
             }
 
-            if (declaration?.nameIdentifier == null) return null
+            if (declaration?.nameIdentifier == null ||
+                !declaration.languageVersionSettings.supportsFeature(LanguageFeature.SingleUnderscoreForParameterName)) {
+                return null
+            }
 
             return RenameToUnderscoreFix(declaration)
         }