ReplaceGuardClause inspection: check contracts availability

idea/src/org/jetbrains/kotlin/idea/inspections/ReplaceGuardClauseWithFunctionCallInspection.kt

@@ -8,10 +8,12 @@ package org.jetbrains.kotlin.idea.inspections
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.core.ShortenReferences
 import org.jetbrains.kotlin.idea.core.replaced
 import org.jetbrains.kotlin.idea.intentions.callExpression
+import org.jetbrains.kotlin.idea.project.languageVersionSettings
 import org.jetbrains.kotlin.idea.util.CommentSaver
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.name.FqName
@@ -44,6 +46,8 @@ class ReplaceGuardClauseWithFunctionCallInspection : AbstractApplicabilityBasedI
         element.getKotlinFunction()?.let { "Replace with '${it.functionName}()' call" } ?: defaultFixText
 
     override fun isApplicable(element: KtIfExpression): Boolean {
+        val languageVersionSettings = element.languageVersionSettings
+        if (!languageVersionSettings.supportsFeature(LanguageFeature.UseReturnsEffect)) return false
         if (element.condition == null) return false
         val call = element.getCallExpression() ?: return false
         val calleeText = call.calleeExpression?.text ?: return false

idea/testData/inspectionsLocal/replaceGuardClauseWithFunctionCall/version12.kt

@@ -0,0 +1,11 @@
+// PROBLEM: none
+// WITH_RUNTIME
+// LANGUAGE_VERSION: 1.2
+fun test(foo: Int?) {
+    <caret>if (foo == null) {
+        throw IllegalArgumentException("test")
+    }
+    bar(foo)
+}
+
+fun bar(i: Int) {}

idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -8924,6 +8924,11 @@ public class LocalInspectionTestGenerated extends AbstractLocalInspectionTest {
             runTest("idea/testData/inspectionsLocal/replaceGuardClauseWithFunctionCall/notTargetException.kt");
         }
 
+        @TestMetadata("version12.kt")
+        public void testVersion12() throws Exception {
+            runTest("idea/testData/inspectionsLocal/replaceGuardClauseWithFunctionCall/version12.kt");
+        }
+
         @TestMetadata("idea/testData/inspectionsLocal/replaceGuardClauseWithFunctionCall/check")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)