diff --git a/compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.kt b/compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.kt
deleted file mode 100644
index e8121bf56ba..00000000000
--- a/compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.kt
+++ /dev/null
@@ -1,21 +0,0 @@
-// !LANGUAGE_VERSION: 1.0
-
-public interface Base {
-    fun getValue(): String
-
-    fun test() = getValue()
-}
-
-class Delegate : Base {
-    override fun getValue() = "Delegate"
-}
-
-public abstract class MyClass : Base {
-    override fun test(): String {
-        return "Class"
-    }
-}
-
-<!DELEGATED_MEMBER_HIDES_SUPERTYPE_OVERRIDE!>class A<!> : MyClass(), Base by Delegate() {
-    override fun getValue() = "Delegate"
-}
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.txt b/compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.txt
deleted file mode 100644
index 1355d6b325d..00000000000
--- a/compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.txt
+++ /dev/null
@@ -1,36 +0,0 @@
-package
-
-public final class A : MyClass, Base {
-    public constructor A()
-    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*2*/ fun getValue(): kotlin.String
-    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*2*/ /*delegation*/ fun test(): kotlin.String
-    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public interface Base {
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public abstract fun getValue(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open fun test(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public final class Delegate : Base {
-    public constructor Delegate()
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ fun getValue(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun test(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public abstract class MyClass : Base {
-    public constructor MyClass()
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public abstract override /*1*/ /*fake_override*/ fun getValue(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ fun test(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
diff --git a/compiler/tests-common/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt b/compiler/tests-common/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt
index 4d25012280a..b3b82b88630 100644
--- a/compiler/tests-common/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt
+++ b/compiler/tests-common/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt
@@ -279,7 +279,6 @@ abstract class BaseDiagnosticsTest : KotlinMultiFileTestWithJava<TestModule, Tes
         )
 
         val LANGUAGE_DIRECTIVE = "LANGUAGE"
-        val LANGUAGE_VERSION = "LANGUAGE_VERSION"
         private val LANGUAGE_PATTERN = Pattern.compile("(\\+|\\-|warn:)(\\w+)\\s*")
 
         val DEFAULT_DIAGNOSTIC_TESTS_FEATURES = mapOf(
@@ -311,17 +310,14 @@ abstract class BaseDiagnosticsTest : KotlinMultiFileTestWithJava<TestModule, Tes
         private fun parseLanguageVersionSettings(directiveMap: Map<String, String>): LanguageVersionSettings? {
             val apiVersionString = directiveMap[API_VERSION_DIRECTIVE]
             val directives = directiveMap[LANGUAGE_DIRECTIVE]
-            val languageVersionDirective = directiveMap[LANGUAGE_VERSION]
-            if (apiVersionString == null && directives == null && languageVersionDirective == null) return null
+            if (apiVersionString == null && directives == null) return null
 
             val apiVersion = (if (apiVersionString != null) ApiVersion.parse(apiVersionString) else ApiVersion.LATEST_STABLE)
                              ?: error("Unknown API version: $apiVersionString")
 
             val languageFeatures = directives?.let(this::collectLanguageFeatureMap).orEmpty()
 
-            val languageVersion: LanguageVersion = languageVersionDirective?.let { LanguageVersion.fromVersionString(it) } ?: LanguageVersion.LATEST_STABLE
-
-            return DiagnosticTestLanguageVersionSettings(languageFeatures, apiVersion, languageVersion)
+            return DiagnosticTestLanguageVersionSettings(languageFeatures, apiVersion, LanguageVersion.LATEST_STABLE)
         }
 
         private fun collectLanguageFeatureMap(directives: String): Map<LanguageFeature, LanguageFeature.State> {
diff --git a/compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java
index abb9b090455..77a6529d85c 100644
--- a/compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java
@@ -6270,12 +6270,6 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                     doTest(fileName);
                 }
 
-                @TestMetadata("simple1.0.kt")
-                public void testSimple1_0() throws Exception {
-                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.kt");
-                    doTest(fileName);
-                }
-
                 @TestMetadata("simpleNoOverride.kt")
                 public void testSimpleNoOverride() throws Exception {
                     String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simpleNoOverride.kt");