Value classes: treat @JvmInline value classes as inline classes

Report error on value classes without @JvmInline annotation.
Do not check for @JvmInline annotation in value classes since
it breaks reflection.

compiler/backend/src/org/jetbrains/kotlin/codegen/DefaultParameterValueSubstitutor.kt

@@ -267,7 +267,7 @@ class DefaultParameterValueSubstitutor(val state: GenerationState) {
         if (classDescriptor.kind != ClassKind.CLASS) return false
 
         if (classOrObject.isLocal) return false
-        if (classDescriptor.isInline) return false
+        if (classDescriptor.isInlineClass()) return false
         if (shouldHideConstructorDueToInlineClassTypeValueParameters(constructorDescriptor)) return false
 
         if (CodegenBinding.canHaveOuter(state.bindingContext, classDescriptor)) return false

compiler/backend/src/org/jetbrains/kotlin/codegen/DescriptorAsmUtil.java

@@ -216,7 +216,7 @@ public class DescriptorAsmUtil {
     private static boolean isInlineClassWrapperConstructor(@NotNull FunctionDescriptor functionDescriptor, @Nullable OwnerKind kind) {
         if (!(functionDescriptor instanceof ConstructorDescriptor)) return false;
         ClassDescriptor classDescriptor = ((ConstructorDescriptor) functionDescriptor).getConstructedClass();
-        return classDescriptor.isInline() && kind == OwnerKind.IMPLEMENTATION;
+        return InlineClassesUtilsKt.isInlineClass(classDescriptor) && kind == OwnerKind.IMPLEMENTATION;
     }
 
     public static int getCommonCallableFlags(FunctionDescriptor functionDescriptor, @NotNull GenerationState state) {
@@ -559,7 +559,7 @@ public class DescriptorAsmUtil {
         if (receiverKotlinType.isMarkedNullable()) return null;
 
         DeclarationDescriptor receiverTypeDescriptor = receiverKotlinType.getConstructor().getDeclarationDescriptor();
-        assert receiverTypeDescriptor instanceof ClassDescriptor && ((ClassDescriptor) receiverTypeDescriptor).isInline() :
+        assert receiverTypeDescriptor != null && InlineClassesUtilsKt.isInlineClass(receiverTypeDescriptor) :
                 "Inline class type expected: " + receiverKotlinType;
         ClassDescriptor receiverClassDescriptor = (ClassDescriptor) receiverTypeDescriptor;
         FunctionDescriptor toStringDescriptor = receiverClassDescriptor.getUnsubstitutedMemberScope()

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -1190,7 +1190,7 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
             ClassDescriptor captureThis = closure.getCapturedOuterClassDescriptor();
             if (captureThis != null) {
                 StackValue thisOrOuter = generateThisOrOuter(captureThis, false);
-                assert !isPrimitive(thisOrOuter.type) || captureThis.isInline() :
+                assert !isPrimitive(thisOrOuter.type) || InlineClassesUtilsKt.isInlineClass(captureThis) :
                         "This or outer for " + captureThis + " should be non-primitive: " + thisOrOuter.type;
                 callGenerator.putCapturedValueOnStack(thisOrOuter, thisOrOuter.type, paramIndex++);
             }
@@ -4830,7 +4830,7 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
             ReceiverParameterDescriptor dispatchReceiver = constructor.getDispatchReceiverParameter();
             ClassDescriptor containingDeclaration = constructor.getContainingDeclaration();
 
-            if (!containingDeclaration.isInline()) {
+            if (!InlineClassesUtilsKt.isInlineClass(containingDeclaration)) {
                 v.anew(objectType);
                 v.dup();
             }

compiler/backend/src/org/jetbrains/kotlin/codegen/FunctionCodegen.java

@@ -1589,7 +1589,7 @@ public class FunctionCodegen {
 
                         // When delegating to inline class, we invoke static implementation method
                         // that takes inline class underlying value as 1st argument.
-                        int toArgsShift = toClass.isInline() ? 1 : 0;
+                        int toArgsShift = InlineClassesUtilsKt.isInlineClass(toClass) ? 1 : 0;
 
                         int reg = 1;
                         for (int i = 0; i < argTypes.length; ++i) {
@@ -1609,7 +1609,7 @@ public class FunctionCodegen {
                         if (toClass.getKind() == ClassKind.INTERFACE) {
                             iv.invokeinterface(internalName, delegateToMethod.getName(), delegateToMethod.getDescriptor());
                         }
-                        else if (toClass.isInline()) {
+                        else if (InlineClassesUtilsKt.isInlineClass(toClass)) {
                             iv.invokestatic(internalName, delegateToMethod.getName(), delegateToMethod.getDescriptor(), false);
                         }
                         else {

compiler/backend/src/org/jetbrains/kotlin/codegen/FunctionsFromAnyGeneratorImpl.java

@@ -84,7 +84,7 @@ public class FunctionsFromAnyGeneratorImpl extends FunctionsFromAnyGenerator {
         String toStringMethodDesc = getToStringDesc();
         MethodVisitor mv = v.newMethod(methodOrigin, getAccess(), toStringMethodName, toStringMethodDesc, null, null);
 
-        if (!isInErasedInlineClass && classDescriptor.isInline()) {
+        if (!isInErasedInlineClass && InlineClassesUtilsKt.isInlineClass(classDescriptor)) {
             FunctionCodegen.generateMethodInsideInlineClassWrapper(methodOrigin, function, classDescriptor, mv, typeMapper);
             return;
         }
@@ -161,7 +161,7 @@ public class FunctionsFromAnyGeneratorImpl extends FunctionsFromAnyGenerator {
         String hashCodeMethodDesc = getHashCodeDesc();
         MethodVisitor mv = v.newMethod(methodOrigin, getAccess(), hashCodeMethodName, hashCodeMethodDesc, null, null);
 
-        if (!isInErasedInlineClass && classDescriptor.isInline()) {
+        if (!isInErasedInlineClass && InlineClassesUtilsKt.isInlineClass(classDescriptor)) {
             FunctionCodegen.generateMethodInsideInlineClassWrapper(methodOrigin, function, classDescriptor, mv, typeMapper);
             return;
         }
@@ -233,7 +233,7 @@ public class FunctionsFromAnyGeneratorImpl extends FunctionsFromAnyGenerator {
         String equalsMethodDesc = getEqualsDesc();
         MethodVisitor mv = v.newMethod(methodOrigin, getAccess(), equalsMethodName, equalsMethodDesc, null, null);
 
-        if (!isInErasedInlineClass && classDescriptor.isInline()) {
+        if (!isInErasedInlineClass && InlineClassesUtilsKt.isInlineClass(classDescriptor)) {
             FunctionCodegen.generateMethodInsideInlineClassWrapper(methodOrigin, function, classDescriptor, mv, typeMapper);
             return;
         }

compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java

@@ -260,7 +260,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
     @Override
     protected void generateErasedInlineClassIfNeeded() {
         if (!(myClass instanceof KtClass)) return;
-        if (!descriptor.isInline()) return;
+        if (!InlineClassesUtilsKt.isInlineClass(descriptor)) return;
 
         ClassContext erasedInlineClassContext = context.intoWrapperForErasedInlineClass(descriptor, state);
         new ErasedInlineClassBodyCodegen((KtClass) myClass, erasedInlineClassContext, v, state, this).generate();
@@ -269,7 +269,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
     @Override
     protected void generateUnboxMethodForInlineClass() {
         if (!(myClass instanceof KtClass)) return;
-        if (!descriptor.isInline()) return;
+        if (!InlineClassesUtilsKt.isInlineClass(descriptor)) return;
 
         Type ownerType = typeMapper.mapClass(descriptor);
         ValueParameterDescriptor inlinedValue = InlineClassesUtilsKt.underlyingRepresentation(this.descriptor);
@@ -450,7 +450,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
         try {
             lookupConstructorExpressionsInClosureIfPresent();
             constructorCodegen.generatePrimaryConstructor(delegationFieldsInfo, superClassAsmType);
-            if (!descriptor.isInline() && !(descriptor instanceof SyntheticClassOrObjectDescriptor)) {
+            if (!InlineClassesUtilsKt.isInlineClass(descriptor) && !(descriptor instanceof SyntheticClassOrObjectDescriptor)) {
                 // Synthetic classes does not have declarations for secondary constructors
                 for (ClassConstructorDescriptor secondaryConstructor : DescriptorUtilsKt.getSecondaryConstructors(descriptor)) {
                     constructorCodegen.generateSecondaryConstructor(secondaryConstructor, superClassAsmType);
@@ -552,7 +552,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
     }
 
     private void generateFunctionsFromAnyForInlineClasses() {
-        if (!descriptor.isInline()) return;
+        if (!InlineClassesUtilsKt.isInlineClass(descriptor)) return;
         if (!(myClass instanceof KtClassOrObject)) return;
         new FunctionsFromAnyGeneratorImpl(
                 (KtClassOrObject) myClass, bindingContext, descriptor, classAsmType, context, v, state

compiler/backend/src/org/jetbrains/kotlin/codegen/StackValue.java

@@ -775,7 +775,8 @@ public abstract class StackValue {
     ) {
         // Coerce 'this' for the case when it is smart cast.
         // Do not coerce for other cases due to the 'protected' access issues (JVMS 7, 4.9.2 Structural Constraints).
-        boolean coerceType = descriptor.getKind() == ClassKind.INTERFACE || descriptor.isInline() || (castReceiver && !isSuper);
+        boolean coerceType = descriptor.getKind() == ClassKind.INTERFACE || InlineClassesUtilsKt.isInlineClass(descriptor) ||
+                             (castReceiver && !isSuper);
         return new ThisOuter(codegen, descriptor, isSuper, coerceType);
     }
 

compiler/backend/src/org/jetbrains/kotlin/codegen/context/ConstructorContext.java

@@ -24,6 +24,7 @@ import org.jetbrains.kotlin.codegen.binding.MutableClosure;
 import org.jetbrains.kotlin.codegen.state.KotlinTypeMapper;
 import org.jetbrains.kotlin.descriptors.ClassDescriptor;
 import org.jetbrains.kotlin.descriptors.ConstructorDescriptor;
+import org.jetbrains.kotlin.resolve.InlineClassesUtilsKt;
 import org.jetbrains.kotlin.resolve.jvm.AsmTypes;
 import org.jetbrains.kotlin.types.SimpleType;
 import org.jetbrains.org.objectweb.asm.Type;
@@ -48,7 +49,7 @@ public class ConstructorContext extends MethodContext {
         ClassDescriptor capturedOuterClassDescriptor = closure != null ? closure.getCapturedOuterClassDescriptor() : null;
         StackValue stackValue;
         if (capturedOuterClassDescriptor != null) {
-            if (capturedOuterClassDescriptor.isInline()) {
+            if (InlineClassesUtilsKt.isInlineClass(capturedOuterClassDescriptor)) {
                 SimpleType outerClassKotlinType = capturedOuterClassDescriptor.getDefaultType();
                 Type outerClassType = kotlinTypeMapper.mapType(capturedOuterClassDescriptor);
                 stackValue = StackValue.local(1, outerClassType, outerClassKotlinType);

compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/BoxedBasicValue.kt

@@ -20,6 +20,7 @@ import com.intellij.openapi.util.Pair
 import org.jetbrains.kotlin.codegen.AsmUtil
 import org.jetbrains.kotlin.codegen.optimization.common.StrictBasicValue
 import org.jetbrains.kotlin.codegen.state.GenerationState
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.jvm.AsmTypes
 import org.jetbrains.org.objectweb.asm.Type
 import org.jetbrains.org.objectweb.asm.tree.AbstractInsnNode
@@ -119,7 +120,7 @@ fun getUnboxedType(boxedType: Type, state: GenerationState): Type {
 
 fun unboxedTypeOfInlineClass(boxedType: Type, state: GenerationState): Type? {
     val descriptor =
-        state.jvmBackendClassResolver.resolveToClassDescriptors(boxedType).singleOrNull()?.takeIf { it.isInline } ?: return null
+        state.jvmBackendClassResolver.resolveToClassDescriptors(boxedType).singleOrNull()?.takeIf { it.isInlineClass() } ?: return null
     return state.mapInlineClass(descriptor)
 }
 

compiler/backend/src/org/jetbrains/kotlin/codegen/state/KotlinTypeMapper.kt

@@ -445,7 +445,7 @@ class KotlinTypeMapper @JvmOverloads constructor(
                     }
                 }
             } else {
-                val toInlinedErasedClass = functionParent.isInline &&
+                val toInlinedErasedClass = functionParent.isInlineClass() &&
                         (!isAccessor(functionDescriptor) || isInlineClassConstructorAccessor(functionDescriptor))
 
                 if (toInlinedErasedClass) {

compiler/backend/src/org/jetbrains/kotlin/codegen/state/inlineClassManglingUtils.kt

@@ -13,6 +13,7 @@ import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.InlineClassDescriptorResolver
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.jvm.requiresFunctionNameManglingForParameterTypes
 import org.jetbrains.kotlin.resolve.jvm.requiresFunctionNameManglingForReturnType
 import org.jetbrains.kotlin.types.KotlinType
@@ -111,7 +112,7 @@ fun getManglingSuffixBasedOnKotlinSignature(
 private fun getInfoForMangling(type: KotlinType): InfoForMangling? {
     val descriptor = type.constructor.declarationDescriptor ?: return null
     return when (descriptor) {
-        is ClassDescriptor -> InfoForMangling(descriptor.fqNameUnsafe, descriptor.isInline, type.isMarkedNullable)
+        is ClassDescriptor -> InfoForMangling(descriptor.fqNameUnsafe, descriptor.isInlineClass(), type.isMarkedNullable)
 
         is TypeParameterDescriptor -> {
             getInfoForMangling(descriptor.representativeUpperBound)

compiler/backend/src/org/jetbrains/kotlin/codegen/state/typeMapperUtils.kt

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.impl.TypeParameterDescriptorImpl
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.typeUtil.asTypeProjection
 
@@ -93,4 +94,4 @@ fun KotlinType.removeExternalProjections(): KotlinType {
 
 fun isInlineClassConstructorAccessor(descriptor: FunctionDescriptor): Boolean =
     descriptor is AccessorForConstructorDescriptor &&
-            descriptor.calleeDescriptor.constructedClass.isInline
+            descriptor.calleeDescriptor.constructedClass.isInlineClass()

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/fir/FirOldFrontendDiagnosticsTestGenerated.java

@@ -24968,6 +24968,129 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirOldFronte
         }
     }
 
+    @TestMetadata("compiler/testData/diagnostics/tests/valueClasses")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class ValueClasses extends AbstractFirOldFrontendDiagnosticsTest {
+        private void runTest(String testDataFilePath) throws Exception {
+            KotlinTestUtils.runTest(this::doTest, this, testDataFilePath);
+        }
+
+        public void testAllFilesPresentInValueClasses() throws Exception {
+            KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/valueClasses"), Pattern.compile("^(.+)\\.kt$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
+        }
+
+        @TestMetadata("basicValueClassDeclaration.kt")
+        public void testBasicValueClassDeclaration() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclaration.kt");
+        }
+
+        @TestMetadata("basicValueClassDeclarationDisabled.kt")
+        public void testBasicValueClassDeclarationDisabled() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclarationDisabled.kt");
+        }
+
+        @TestMetadata("constructorsJvmSignaturesClash.kt")
+        public void testConstructorsJvmSignaturesClash() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/constructorsJvmSignaturesClash.kt");
+        }
+
+        @TestMetadata("delegatedPropertyInValueClass.kt")
+        public void testDelegatedPropertyInValueClass() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/delegatedPropertyInValueClass.kt");
+        }
+
+        @TestMetadata("functionsJvmSignaturesClash.kt")
+        public void testFunctionsJvmSignaturesClash() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesClash.kt");
+        }
+
+        @TestMetadata("functionsJvmSignaturesConflictOnInheritance.kt")
+        public void testFunctionsJvmSignaturesConflictOnInheritance() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesConflictOnInheritance.kt");
+        }
+
+        @TestMetadata("identityComparisonWithValueClasses.kt")
+        public void testIdentityComparisonWithValueClasses() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/identityComparisonWithValueClasses.kt");
+        }
+
+        @TestMetadata("lateinitValueClasses.kt")
+        public void testLateinitValueClasses() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/lateinitValueClasses.kt");
+        }
+
+        @TestMetadata("presenceOfInitializerBlockInsideValueClass.kt")
+        public void testPresenceOfInitializerBlockInsideValueClass() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/presenceOfInitializerBlockInsideValueClass.kt");
+        }
+
+        @TestMetadata("presenceOfPublicPrimaryConstructorForValueClass.kt")
+        public void testPresenceOfPublicPrimaryConstructorForValueClass() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/presenceOfPublicPrimaryConstructorForValueClass.kt");
+        }
+
+        @TestMetadata("propertiesWithBackingFieldsInsideValueClass.kt")
+        public void testPropertiesWithBackingFieldsInsideValueClass() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/propertiesWithBackingFieldsInsideValueClass.kt");
+        }
+
+        @TestMetadata("recursiveValueClasses.kt")
+        public void testRecursiveValueClasses() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/recursiveValueClasses.kt");
+        }
+
+        @TestMetadata("reservedMembersAndConstructsInsideValueClass.kt")
+        public void testReservedMembersAndConstructsInsideValueClass() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/reservedMembersAndConstructsInsideValueClass.kt");
+        }
+
+        @TestMetadata("unsignedLiteralsWithoutArtifactOnClasspath.kt")
+        public void testUnsignedLiteralsWithoutArtifactOnClasspath() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/unsignedLiteralsWithoutArtifactOnClasspath.kt");
+        }
+
+        @TestMetadata("valueClassCanOnlyImplementInterfaces.kt")
+        public void testValueClassCanOnlyImplementInterfaces() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassCanOnlyImplementInterfaces.kt");
+        }
+
+        @TestMetadata("valueClassCannotImplementInterfaceByDelegation.kt")
+        public void testValueClassCannotImplementInterfaceByDelegation() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassCannotImplementInterfaceByDelegation.kt");
+        }
+
+        @TestMetadata("valueClassConstructorParameterWithDefaultValue.kt")
+        public void testValueClassConstructorParameterWithDefaultValue() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassConstructorParameterWithDefaultValue.kt");
+        }
+
+        @TestMetadata("valueClassDeclarationCheck.kt")
+        public void testValueClassDeclarationCheck() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassDeclarationCheck.kt");
+        }
+
+        @TestMetadata("valueClassImplementsCollection.kt")
+        public void testValueClassImplementsCollection() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassImplementsCollection.kt");
+        }
+
+        @TestMetadata("valueClassWithForbiddenUnderlyingType.kt")
+        public void testValueClassWithForbiddenUnderlyingType() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassWithForbiddenUnderlyingType.kt");
+        }
+
+        @TestMetadata("valueClassesInsideAnnotations.kt")
+        public void testValueClassesInsideAnnotations() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassesInsideAnnotations.kt");
+        }
+
+        @TestMetadata("varargsOnParametersOfValueClassType.kt")
+        public void testVarargsOnParametersOfValueClassType() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/valueClasses/varargsOnParametersOfValueClassType.kt");
+        }
+    }
+
     @TestMetadata("compiler/testData/diagnostics/tests/varargs")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -362,6 +362,7 @@ public interface Errors {
     DiagnosticFactory0<KtTypeReference> INLINE_CLASS_CANNOT_BE_RECURSIVE = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory1<PsiElement, String> RESERVED_MEMBER_INSIDE_INLINE_CLASS = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory0<PsiElement> SECONDARY_CONSTRUCTOR_WITH_BODY_INSIDE_INLINE_CLASS = DiagnosticFactory0.create(ERROR);
+    DiagnosticFactory0<PsiElement> VALUE_CLASS_WITHOUT_JVM_INLINE_ANNOTATION = DiagnosticFactory0.create(ERROR);
 
     // Result class
 

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -717,6 +717,7 @@ public class DefaultErrorMessages {
         MAP.put(INLINE_CLASS_CANNOT_BE_RECURSIVE, "Inline class cannot be recursive");
         MAP.put(RESERVED_MEMBER_INSIDE_INLINE_CLASS, "Member with the name ''{0}'' is reserved for future releases", STRING);
         MAP.put(SECONDARY_CONSTRUCTOR_WITH_BODY_INSIDE_INLINE_CLASS, "Secondary constructors with bodies are reserved for for future releases");
+        MAP.put(VALUE_CLASS_WITHOUT_JVM_INLINE_ANNOTATION, "Value classes without @JvmInline annotation are not supported yet");
 
         MAP.put(RESULT_CLASS_IN_RETURN_TYPE, "'kotlin.Result' cannot be used as a return type");
         MAP.put(RESULT_CLASS_WITH_NULLABLE_OPERATOR, "Expression of type 'kotlin.Result' cannot be used as a left operand of ''{0}''", STRING);

compiler/frontend/src/org/jetbrains/kotlin/resolve/DeclarationsChecker.kt

@@ -270,7 +270,7 @@ class DeclarationsChecker(
 
         if (declaration is KtPrimaryConstructor &&
             !DescriptorUtils.isAnnotationClass(constructorDescriptor.constructedClass) &&
-            !constructorDescriptor.constructedClass.isInline
+            !constructorDescriptor.constructedClass.isInlineClass()
         ) {
             for (parameter in declaration.valueParameters) {
                 if (parameter.hasValOrVar()) {

compiler/frontend/src/org/jetbrains/kotlin/resolve/ModifiersChecker.kt

@@ -107,7 +107,8 @@ object ModifierCheckerCore {
             ANNOTATION_CLASS,
             TYPEALIAS
         ),
-        FUN_KEYWORD to EnumSet.of(INTERFACE)
+        FUN_KEYWORD to EnumSet.of(INTERFACE),
+        VALUE_KEYWORD to EnumSet.of(CLASS_ONLY)
     )
 
     private val featureDependencies = mapOf(
@@ -118,7 +119,8 @@ object ModifierCheckerCore {
         EXPECT_KEYWORD to listOf(LanguageFeature.MultiPlatformProjects),
         ACTUAL_KEYWORD to listOf(LanguageFeature.MultiPlatformProjects),
         LATEINIT_KEYWORD to listOf(LanguageFeature.LateinitTopLevelProperties, LanguageFeature.LateinitLocalVariables),
-        FUN_KEYWORD to listOf(LanguageFeature.FunctionalInterfaceConversion)
+        FUN_KEYWORD to listOf(LanguageFeature.FunctionalInterfaceConversion),
+        VALUE_KEYWORD to listOf(LanguageFeature.InlineClasses)
     )
 
     private val featureDependenciesTargets = mapOf(
@@ -185,12 +187,13 @@ object ModifierCheckerCore {
         result += incompatibilityRegister(PRIVATE_KEYWORD, PROTECTED_KEYWORD, PUBLIC_KEYWORD, INTERNAL_KEYWORD)
         // Abstract + open + final + sealed: incompatible
         result += incompatibilityRegister(ABSTRACT_KEYWORD, OPEN_KEYWORD, FINAL_KEYWORD, SEALED_KEYWORD)
-        // data + open, data + inner, data + abstract, data + sealed, data + inline
+        // data + open, data + inner, data + abstract, data + sealed, data + inline, data + value
         result += incompatibilityRegister(DATA_KEYWORD, OPEN_KEYWORD)
         result += incompatibilityRegister(DATA_KEYWORD, INNER_KEYWORD)
         result += incompatibilityRegister(DATA_KEYWORD, ABSTRACT_KEYWORD)
         result += incompatibilityRegister(DATA_KEYWORD, SEALED_KEYWORD)
         result += incompatibilityRegister(DATA_KEYWORD, INLINE_KEYWORD)
+        result += incompatibilityRegister(DATA_KEYWORD, VALUE_KEYWORD)
         // open is redundant to abstract & override
         result += redundantRegister(ABSTRACT_KEYWORD, OPEN_KEYWORD)
         // abstract is redundant to sealed

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/InlineClassDeclarationChecker.kt

@@ -9,9 +9,9 @@ import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.lexer.KtTokens
+import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.psiUtil.modalityModifier
-import org.jetbrains.kotlin.psi.psiUtil.visibilityModifier
 import org.jetbrains.kotlin.resolve.*
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.typeUtil.isNothing
@@ -22,15 +22,16 @@ import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 object InlineClassDeclarationChecker : DeclarationChecker {
     override fun check(declaration: KtDeclaration, descriptor: DeclarationDescriptor, context: DeclarationCheckerContext) {
         if (declaration !is KtClass) return
-        if (descriptor !is ClassDescriptor || !descriptor.isInline) return
+        if (descriptor !is ClassDescriptor || !descriptor.isInline && !descriptor.isValue) return
         if (descriptor.kind != ClassKind.CLASS) return
 
-        val inlineKeyword = declaration.modifierList?.getModifier(KtTokens.INLINE_KEYWORD)
-        require(inlineKeyword != null) { "Declaration of inline class must have 'inline' keyword" }
+        val inlineOrValueKeyword = declaration.modifierList?.getModifier(KtTokens.INLINE_KEYWORD)
+            ?: declaration.modifierList?.getModifier(KtTokens.VALUE_KEYWORD)
+        require(inlineOrValueKeyword != null) { "Declaration of inline class must have 'inline' keyword" }
 
         val trace = context.trace
         if (!DescriptorUtils.isTopLevelDeclaration(descriptor)) {
-            trace.report(Errors.INLINE_CLASS_NOT_TOP_LEVEL.on(inlineKeyword))
+            trace.report(Errors.INLINE_CLASS_NOT_TOP_LEVEL.on(inlineOrValueKeyword))
             return
         }
 
@@ -42,7 +43,7 @@ object InlineClassDeclarationChecker : DeclarationChecker {
 
         val primaryConstructor = declaration.primaryConstructor
         if (primaryConstructor == null) {
-            trace.report(Errors.ABSENCE_OF_PRIMARY_CONSTRUCTOR_FOR_INLINE_CLASS.on(inlineKeyword))
+            trace.report(Errors.ABSENCE_OF_PRIMARY_CONSTRUCTOR_FOR_INLINE_CLASS.on(inlineOrValueKeyword))
             return
         }
 
@@ -87,6 +88,10 @@ object InlineClassDeclarationChecker : DeclarationChecker {
                 }
             }
         }
+
+        if (descriptor.isValue && !descriptor.annotations.hasAnnotation(JVM_INLINE_ANNOTATION)) {
+            trace.report(Errors.VALUE_CLASS_WITHOUT_JVM_INLINE_ANNOTATION.on(inlineOrValueKeyword))
+        }
     }
 
     private fun KotlinType.isInapplicableParameterType() =

compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyClassMemberScope.kt

@@ -258,7 +258,7 @@ open class LazyClassMemberScope(
         name: Name,
         fromSupertypes: List<SimpleFunctionDescriptor>
     ) {
-        if (!thisDescriptor.isInline) return
+        if (!thisDescriptor.isInlineClass()) return
         addFunctionFromAnyIfNeeded(result, name, fromSupertypes)
     }
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeclarationStubGenerator.kt

@@ -32,6 +32,7 @@ import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.descriptorUtil.isEffectivelyExternal
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.scopes.getDescriptorsFiltered
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DescriptorWithContainerSource
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
@@ -274,7 +275,7 @@ class DeclarationStubGenerator(
                 isInner = descriptor.isInner,
                 isData = descriptor.isData,
                 isExternal = descriptor.isEffectivelyExternal(),
-                isInline = descriptor.isInline,
+                isInline = descriptor.isInlineClass(),
                 isExpect = descriptor.isExpect,
                 isFun = descriptor.isFun,
                 stubGenerator = this,

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DescriptorToIrUtil.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.ir.declarations.IrFactory
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.descriptorUtil.isEffectivelyExternal
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.types.KotlinType
 
 val ParameterDescriptor.indexOrMinusOne: Int
@@ -38,5 +39,5 @@ fun IrFactory.createIrClassFromDescriptor(
 ): IrClass = createClass(
     startOffset, endOffset, origin, symbol, name, descriptor.kind, visibility, modality,
     descriptor.isCompanionObject, descriptor.isInner, descriptor.isData, descriptor.isEffectivelyExternal(),
-    descriptor.isInline, descriptor.isExpect, descriptor.isFun, descriptor.source
+    descriptor.isInlineClass(), descriptor.isExpect, descriptor.isFun, descriptor.source
 )

compiler/psi/src/org/jetbrains/kotlin/psi/KtClass.kt

@@ -33,6 +33,7 @@ open class KtClass : KtClassOrObject {
     fun isSealed(): Boolean = hasModifier(KtTokens.SEALED_KEYWORD)
     fun isInner(): Boolean = hasModifier(KtTokens.INNER_KEYWORD)
     fun isInline(): Boolean = hasModifier(KtTokens.INLINE_KEYWORD)
+    fun isValue(): Boolean = hasModifier(KtTokens.VALUE_KEYWORD)
 
     override fun getCompanionObjects(): List<KtObjectDeclaration> = body?.allCompanionObjects.orEmpty()
 

compiler/serialization/src/org/jetbrains/kotlin/serialization/DescriptorSerializer.kt

@@ -23,10 +23,8 @@ import org.jetbrains.kotlin.metadata.serialization.MutableTypeTable
 import org.jetbrains.kotlin.metadata.serialization.MutableVersionRequirementTable
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.resolve.*
 import org.jetbrains.kotlin.resolve.DescriptorUtils.isEnumEntry
-import org.jetbrains.kotlin.resolve.MemberComparator
-import org.jetbrains.kotlin.resolve.RequireKotlinConstants
 import org.jetbrains.kotlin.resolve.calls.components.isActualParameterWithAnyExpectedDefault
 import org.jetbrains.kotlin.resolve.constants.EnumValue
 import org.jetbrains.kotlin.resolve.constants.IntValue
@@ -34,7 +32,6 @@ import org.jetbrains.kotlin.resolve.constants.NullValue
 import org.jetbrains.kotlin.resolve.constants.StringValue
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.nonSourceAnnotations
-import org.jetbrains.kotlin.resolve.isInlineClassType
 import org.jetbrains.kotlin.serialization.deserialization.ProtoEnumFlags
 import org.jetbrains.kotlin.serialization.deserialization.descriptorVisibility
 import org.jetbrains.kotlin.serialization.deserialization.memberKind
@@ -74,7 +71,7 @@ class DescriptorSerializer private constructor(
             ProtoEnumFlags.modality(classDescriptor.modality),
             ProtoEnumFlags.classKind(classDescriptor.kind, classDescriptor.isCompanionObject),
             classDescriptor.isInner, classDescriptor.isData, classDescriptor.isExternal, classDescriptor.isExpect,
-            classDescriptor.isInline, classDescriptor.isFun
+            classDescriptor.isInlineClass(), classDescriptor.isFun
         )
         if (flags != builder.flags) {
             builder.flags = flags
@@ -173,7 +170,7 @@ class DescriptorSerializer private constructor(
         builder: ProtoBuf.Class.Builder,
         versionRequirementTable: MutableVersionRequirementTable
     ) {
-        if (!classDescriptor.isInline && !classDescriptor.hasInlineClassTypesInSignature()) return
+        if (!classDescriptor.isInlineClass() && !classDescriptor.hasInlineClassTypesInSignature()) return
 
         builder.addVersionRequirement(
             writeLanguageVersionRequirement(LanguageFeature.InlineClasses, versionRequirementTable)

compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclaration.fir.kt

@@ -0,0 +1,13 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+
+value interface InlineInterface
+value annotation class InlineAnn
+value object InlineObject
+value enum class InlineEnum

compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclaration.kt

@@ -0,0 +1,13 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+
+<!WRONG_MODIFIER_TARGET!>value<!> interface InlineInterface
+<!WRONG_MODIFIER_TARGET!>value<!> annotation class InlineAnn
+<!WRONG_MODIFIER_TARGET!>value<!> object InlineObject
+<!WRONG_MODIFIER_TARGET!>value<!> enum class InlineEnum

compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclaration.txt

@@ -0,0 +1,56 @@
+package
+
+package kotlin {
+
+    @kotlin.JvmInline public final value class Foo {
+        public constructor Foo(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final value annotation class InlineAnn : kotlin.Annotation {
+        public constructor InlineAnn()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final value enum class InlineEnum : kotlin.Enum<kotlin.InlineEnum> {
+        private constructor InlineEnum()
+        public final override /*1*/ /*fake_override*/ val name: kotlin.String
+        public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+        protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+        public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: kotlin.InlineEnum): kotlin.Int
+        public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        protected/*protected and package*/ final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun finalize(): kotlin.Unit
+        public final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun getDeclaringClass(): java.lang.Class<kotlin.InlineEnum!>!
+        public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+        // Static members
+        public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): kotlin.InlineEnum
+        public final /*synthesized*/ fun values(): kotlin.Array<kotlin.InlineEnum>
+    }
+
+    public value interface InlineInterface {
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public value object InlineObject {
+        private constructor InlineObject()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclarationDisabled.fir.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: -InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+value class Foo(val x: Int)
+
+value annotation class InlineAnn
+value object InlineObject
+value enum class InlineEnum
+
+@JvmInline
+value class NotVal(x: Int)

compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclarationDisabled.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: -InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+<!UNSUPPORTED_FEATURE, VALUE_CLASS_WITHOUT_JVM_INLINE_ANNOTATION!>value<!> class Foo(val x: Int)
+
+<!WRONG_MODIFIER_TARGET!>value<!> annotation class InlineAnn
+<!WRONG_MODIFIER_TARGET!>value<!> object InlineObject
+<!WRONG_MODIFIER_TARGET!>value<!> enum class InlineEnum
+
+@JvmInline
+<!UNSUPPORTED_FEATURE!>value<!> class NotVal(<!INLINE_CLASS_CONSTRUCTOR_NOT_FINAL_READ_ONLY_PARAMETER!>x: Int<!>)

compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclarationDisabled.txt

@@ -0,0 +1,57 @@
+package
+
+package kotlin {
+
+    public final value class Foo {
+        public constructor Foo(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final value annotation class InlineAnn : kotlin.Annotation {
+        public constructor InlineAnn()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final value enum class InlineEnum : kotlin.Enum<kotlin.InlineEnum> {
+        private constructor InlineEnum()
+        public final override /*1*/ /*fake_override*/ val name: kotlin.String
+        public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+        protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+        public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: kotlin.InlineEnum): kotlin.Int
+        public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        protected/*protected and package*/ final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun finalize(): kotlin.Unit
+        public final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun getDeclaringClass(): java.lang.Class<kotlin.InlineEnum!>!
+        public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+        // Static members
+        public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): kotlin.InlineEnum
+        public final /*synthesized*/ fun values(): kotlin.Array<kotlin.InlineEnum>
+    }
+
+    public value object InlineObject {
+        private constructor InlineObject()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class NotVal {
+        public constructor NotVal(/*0*/ x: kotlin.Int)
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/constructorsJvmSignaturesClash.fir.kt

@@ -0,0 +1,24 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class X(val x: Int)
+@JvmInline
+value class Z(val x: Int)
+
+class TestOk1(val a: Int, val b: Int) {
+    constructor(x: X) : this(x.x, 1)
+}
+
+class TestErr1(val a: Int) {
+    constructor(x: X) : this(x.x)
+}
+
+class TestErr2(val a: Int, val b: Int) {
+    constructor(x: X) : this(x.x, 1)
+    constructor(z: Z) : this(z.x, 2)
+}

compiler/testData/diagnostics/tests/valueClasses/constructorsJvmSignaturesClash.kt

@@ -0,0 +1,24 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class X(val x: Int)
+@JvmInline
+value class Z(val x: Int)
+
+class TestOk1(val a: Int, val b: Int) {
+    constructor(x: X) : this(x.x, 1)
+}
+
+class TestErr1(val a: Int) {
+    <!CONFLICTING_JVM_DECLARATIONS!>constructor(x: X)<!> : this(x.x)
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>TestErr2(val a: Int, val b: Int)<!> {
+    <!CONFLICTING_JVM_DECLARATIONS!>constructor(x: X)<!> : this(x.x, 1)
+    <!CONFLICTING_JVM_DECLARATIONS!>constructor(z: Z)<!> : this(z.x, 2)
+}

compiler/testData/diagnostics/tests/valueClasses/constructorsJvmSignaturesClash.txt

@@ -0,0 +1,57 @@
+package
+
+package kotlin {
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class TestErr1 {
+        public constructor TestErr1(/*0*/ a: kotlin.Int)
+        public constructor TestErr1(/*0*/ x: kotlin.X)
+        public final val a: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class TestErr2 {
+        public constructor TestErr2(/*0*/ a: kotlin.Int, /*1*/ b: kotlin.Int)
+        public constructor TestErr2(/*0*/ x: kotlin.X)
+        public constructor TestErr2(/*0*/ z: kotlin.Z)
+        public final val a: kotlin.Int
+        public final val b: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class TestOk1 {
+        public constructor TestOk1(/*0*/ a: kotlin.Int, /*1*/ b: kotlin.Int)
+        public constructor TestOk1(/*0*/ x: kotlin.X)
+        public final val a: kotlin.Int
+        public final val b: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class X {
+        public constructor X(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Z {
+        public constructor Z(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/delegatedPropertyInValueClass.fir.kt

@@ -0,0 +1,33 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+class Val {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 1
+}
+
+class Var {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 2
+    operator fun setValue(thisRef: Any?, kProp: Any?, value: Int) {}
+}
+
+
+object ValObject {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 1
+}
+
+object VarObject {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 2
+    operator fun setValue(thisRef: Any?, kProp: Any?, value: Int) {}
+}
+
+@JvmInline
+value class Z(val data: Int) {
+    val testVal by Val()
+    var testVar by Var()
+
+    val testValBySingleton by ValObject
+    var testVarBySingleton by VarObject
+}

compiler/testData/diagnostics/tests/valueClasses/delegatedPropertyInValueClass.kt

@@ -0,0 +1,33 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+class Val {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 1
+}
+
+class Var {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 2
+    operator fun setValue(thisRef: Any?, kProp: Any?, value: Int) {}
+}
+
+
+object ValObject {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 1
+}
+
+object VarObject {
+    operator fun getValue(thisRef: Any?, kProp: Any?) = 2
+    operator fun setValue(thisRef: Any?, kProp: Any?, value: Int) {}
+}
+
+@JvmInline
+value class Z(val data: Int) {
+    val testVal <!DELEGATED_PROPERTY_INSIDE_INLINE_CLASS!>by Val()<!>
+    var testVar <!DELEGATED_PROPERTY_INSIDE_INLINE_CLASS!>by Var()<!>
+
+    val testValBySingleton <!DELEGATED_PROPERTY_INSIDE_INLINE_CLASS!>by ValObject<!>
+    var testVarBySingleton <!DELEGATED_PROPERTY_INSIDE_INLINE_CLASS!>by VarObject<!>
+}

compiler/testData/diagnostics/tests/valueClasses/delegatedPropertyInValueClass.txt

@@ -0,0 +1,57 @@
+package
+
+package kotlin {
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class Val {
+        public constructor Val()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ kProp: kotlin.Any?): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public object ValObject {
+        private constructor ValObject()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ kProp: kotlin.Any?): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class Var {
+        public constructor Var()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ kProp: kotlin.Any?): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public final operator fun setValue(/*0*/ thisRef: kotlin.Any?, /*1*/ kProp: kotlin.Any?, /*2*/ value: kotlin.Int): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public object VarObject {
+        private constructor VarObject()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ kProp: kotlin.Any?): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public final operator fun setValue(/*0*/ thisRef: kotlin.Any?, /*1*/ kProp: kotlin.Any?, /*2*/ value: kotlin.Int): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Z {
+        public constructor Z(/*0*/ data: kotlin.Int)
+        public final val data: kotlin.Int
+        public final val testVal: kotlin.Int
+        public final val testValBySingleton: kotlin.Int
+        public final var testVar: kotlin.Int
+        public final var testVarBySingleton: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesClash.fir.kt

@@ -0,0 +1,46 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class X(val x: Int)
+@JvmInline
+value class Z(val x: Int)
+@JvmInline
+value class Str(val str: String)
+@JvmInline
+value class Name(val name: String)
+@JvmInline
+value class NStr(val str: String?)
+
+fun testSimple(x: X) {}
+fun testSimple(z: Z) {}
+
+fun testMixed(x: Int, y: Int) {}
+fun testMixed(x: X, y: Int) {}
+fun testMixed(x: Int, y: X) {}
+fun testMixed(x: X, y: X) {}
+
+fun testNewType(s: Str) {}
+fun testNewType(name: Name) {}
+
+fun testNullableVsNonNull1(s: Str) {}
+fun testNullableVsNonNull1(s: Str?) {}
+
+fun testNullableVsNonNull2(ns: NStr) {}
+fun testNullableVsNonNull2(ns: NStr?) {}
+
+fun testFunVsExt(x: X) {}
+fun X.testFunVsExt() {}
+
+fun testNonGenericVsGeneric(x: X, y: Number) {}
+fun <T : Number> testNonGenericVsGeneric(x: X, y: T) {}
+
+class C<TC : Number> {
+    fun testNonGenericVsGeneric(x: X, y: Number) {}
+    fun <T : Number> testNonGenericVsGeneric(x: X, y: T) {}
+    fun testNonGenericVsGeneric(x: X, y: TC) {}
+}

compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesClash.kt

@@ -0,0 +1,46 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class X(val x: Int)
+@JvmInline
+value class Z(val x: Int)
+@JvmInline
+value class Str(val str: String)
+@JvmInline
+value class Name(val name: String)
+@JvmInline
+value class NStr(val str: String?)
+
+fun testSimple(x: X) {}
+fun testSimple(z: Z) {}
+
+fun testMixed(x: Int, y: Int) {}
+fun testMixed(x: X, y: Int) {}
+fun testMixed(x: Int, y: X) {}
+fun testMixed(x: X, y: X) {}
+
+fun testNewType(s: Str) {}
+fun testNewType(name: Name) {}
+
+fun testNullableVsNonNull1(s: Str) {}
+fun testNullableVsNonNull1(s: Str?) {}
+
+fun testNullableVsNonNull2(ns: NStr) {}
+fun testNullableVsNonNull2(ns: NStr?) {}
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun testFunVsExt(x: X)<!> {}
+<!CONFLICTING_JVM_DECLARATIONS!>fun X.testFunVsExt()<!> {}
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun testNonGenericVsGeneric(x: X, y: Number)<!> {}
+<!CONFLICTING_JVM_DECLARATIONS!>fun <T : Number> testNonGenericVsGeneric(x: X, y: T)<!> {}
+
+class C<TC : Number> {
+    <!CONFLICTING_JVM_DECLARATIONS!>fun testNonGenericVsGeneric(x: X, y: Number)<!> {}
+    <!CONFLICTING_JVM_DECLARATIONS!>fun <T : Number> testNonGenericVsGeneric(x: X, y: T)<!> {}
+    <!CONFLICTING_JVM_DECLARATIONS!>fun testNonGenericVsGeneric(x: X, y: TC)<!> {}
+}

compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesClash.txt

@@ -0,0 +1,77 @@
+package
+
+package kotlin {
+    public fun testFunVsExt(/*0*/ x: kotlin.X): kotlin.Unit
+    public fun testMixed(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int): kotlin.Unit
+    public fun testMixed(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.X): kotlin.Unit
+    public fun testMixed(/*0*/ x: kotlin.X, /*1*/ y: kotlin.Int): kotlin.Unit
+    public fun testMixed(/*0*/ x: kotlin.X, /*1*/ y: kotlin.X): kotlin.Unit
+    public fun testNewType(/*0*/ name: kotlin.Name): kotlin.Unit
+    public fun testNewType(/*0*/ s: kotlin.Str): kotlin.Unit
+    public fun </*0*/ T : kotlin.Number> testNonGenericVsGeneric(/*0*/ x: kotlin.X, /*1*/ y: T): kotlin.Unit
+    public fun testNonGenericVsGeneric(/*0*/ x: kotlin.X, /*1*/ y: kotlin.Number): kotlin.Unit
+    public fun testNullableVsNonNull1(/*0*/ s: kotlin.Str): kotlin.Unit
+    public fun testNullableVsNonNull1(/*0*/ s: kotlin.Str?): kotlin.Unit
+    public fun testNullableVsNonNull2(/*0*/ ns: kotlin.NStr): kotlin.Unit
+    public fun testNullableVsNonNull2(/*0*/ ns: kotlin.NStr?): kotlin.Unit
+    public fun testSimple(/*0*/ x: kotlin.X): kotlin.Unit
+    public fun testSimple(/*0*/ z: kotlin.Z): kotlin.Unit
+    public fun kotlin.X.testFunVsExt(): kotlin.Unit
+
+    public final class C</*0*/ TC : kotlin.Number> {
+        public constructor C</*0*/ TC : kotlin.Number>()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public final fun </*0*/ T : kotlin.Number> testNonGenericVsGeneric(/*0*/ x: kotlin.X, /*1*/ y: T): kotlin.Unit
+        public final fun testNonGenericVsGeneric(/*0*/ x: kotlin.X, /*1*/ y: TC): kotlin.Unit
+        public final fun testNonGenericVsGeneric(/*0*/ x: kotlin.X, /*1*/ y: kotlin.Number): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class NStr {
+        public constructor NStr(/*0*/ str: kotlin.String?)
+        public final val str: kotlin.String?
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Name {
+        public constructor Name(/*0*/ name: kotlin.String)
+        public final val name: kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Str {
+        public constructor Str(/*0*/ str: kotlin.String)
+        public final val str: kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class X {
+        public constructor X(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Z {
+        public constructor Z(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesConflictOnInheritance.kt

@@ -0,0 +1,21 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Name(val name: String)
+@JvmInline
+value class Password(val password: String)
+
+interface NameVerifier {
+    fun verify(name: Name)
+}
+
+interface PasswordVerifier {
+    fun verify(password: Password)
+}
+
+interface NameAndPasswordVerifier : NameVerifier, PasswordVerifier

compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesConflictOnInheritance.txt

@@ -0,0 +1,49 @@
+package
+
+package kotlin {
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Name {
+        public constructor Name(/*0*/ name: kotlin.String)
+        public final val name: kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public interface NameAndPasswordVerifier : kotlin.NameVerifier, kotlin.PasswordVerifier {
+        public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+        public abstract override /*1*/ /*fake_override*/ fun verify(/*0*/ name: kotlin.Name): kotlin.Unit
+        public abstract override /*1*/ /*fake_override*/ fun verify(/*0*/ password: kotlin.Password): kotlin.Unit
+    }
+
+    public interface NameVerifier {
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+        public abstract fun verify(/*0*/ name: kotlin.Name): kotlin.Unit
+    }
+
+    @kotlin.JvmInline public final value class Password {
+        public constructor Password(/*0*/ password: kotlin.String)
+        public final val password: kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public interface PasswordVerifier {
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+        public abstract fun verify(/*0*/ password: kotlin.Password): kotlin.Unit
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/identityComparisonWithValueClasses.fir.kt

@@ -0,0 +1,21 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+@JvmInline
+value class Bar(val y: String)
+
+fun test(f1: Foo, f2: Foo, b1: Bar, fn1: Foo?, fn2: Foo?) {
+    val a1 = f1 === f2 || f1 !== f2
+    val a2 = f1 === f1
+    val a3 = f1 === b1 || f1 !== b1
+
+    val c1 = fn1 === fn2 || fn1 !== fn2
+    val c2 = f1 === fn1 || f1 !== fn1
+    val c3 = b1 === fn1 || b1 !== fn1
+}

compiler/testData/diagnostics/tests/valueClasses/identityComparisonWithValueClasses.kt

@@ -0,0 +1,21 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+@JvmInline
+value class Bar(val y: String)
+
+fun test(f1: Foo, f2: Foo, b1: Bar, fn1: Foo?, fn2: Foo?) {
+    val a1 = <!FORBIDDEN_IDENTITY_EQUALS!>f1 === f2<!> || <!FORBIDDEN_IDENTITY_EQUALS!>f1 !== f2<!>
+    val a2 = <!FORBIDDEN_IDENTITY_EQUALS!>f1 === f1<!>
+    val a3 = <!EQUALITY_NOT_APPLICABLE!>f1 === b1<!> || <!EQUALITY_NOT_APPLICABLE!>f1 !== b1<!>
+
+    val c1 = <!FORBIDDEN_IDENTITY_EQUALS!>fn1 === fn2<!> || <!FORBIDDEN_IDENTITY_EQUALS!>fn1 !== fn2<!>
+    val c2 = f1 === fn1 || f1 !== fn1
+    val c3 = <!EQUALITY_NOT_APPLICABLE!>b1 === fn1<!> || <!EQUALITY_NOT_APPLICABLE!>b1 !== fn1<!>
+}

compiler/testData/diagnostics/tests/valueClasses/identityComparisonWithValueClasses.txt

@@ -0,0 +1,28 @@
+package
+
+package kotlin {
+    public fun test(/*0*/ f1: kotlin.Foo, /*1*/ f2: kotlin.Foo, /*2*/ b1: kotlin.Bar, /*3*/ fn1: kotlin.Foo?, /*4*/ fn2: kotlin.Foo?): kotlin.Unit
+
+    @kotlin.JvmInline public final value class Bar {
+        public constructor Bar(/*0*/ y: kotlin.String)
+        public final val y: kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Foo {
+        public constructor Foo(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/lateinitValueClasses.fir.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+
+lateinit var a: Foo
+
+fun foo() {
+    lateinit var b: Foo
+}

compiler/testData/diagnostics/tests/valueClasses/lateinitValueClasses.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+
+<!INAPPLICABLE_LATEINIT_MODIFIER!>lateinit<!> var a: Foo
+
+fun foo() {
+    <!INAPPLICABLE_LATEINIT_MODIFIER!>lateinit<!> var b: Foo
+}

compiler/testData/diagnostics/tests/valueClasses/lateinitValueClasses.txt

@@ -0,0 +1,21 @@
+package
+
+package kotlin {
+    public lateinit var a: kotlin.Foo
+    public fun foo(): kotlin.Unit
+
+    @kotlin.JvmInline public final value class Foo {
+        public constructor Foo(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/presenceOfInitializerBlockInsideValueClass.kt

@@ -0,0 +1,16 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+// FIR_IDENTICAL
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int) {
+    init {}
+
+    init {
+        val f = 1
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/presenceOfInitializerBlockInsideValueClass.txt

@@ -0,0 +1,19 @@
+package
+
+package kotlin {
+
+    @kotlin.JvmInline public final value class Foo {
+        public constructor Foo(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/presenceOfPublicPrimaryConstructorForValueClass.kt

@@ -0,0 +1,17 @@
+// !LANGUAGE: +InlineClasses
+// FIR_IDENTICAL
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class ConstructorWithDefaultVisibility(val x: Int)
+@JvmInline
+value class PublicConstructor public constructor(val x: Int)
+@JvmInline
+value class InternalConstructor internal constructor(val x: Int)
+@JvmInline
+value class ProtectedConstructor protected constructor(val x: Int)
+@JvmInline
+value class PrivateConstructor private constructor(val x: Int)

compiler/testData/diagnostics/tests/valueClasses/presenceOfPublicPrimaryConstructorForValueClass.txt

@@ -0,0 +1,51 @@
+package
+
+package kotlin {
+
+    @kotlin.JvmInline public final value class ConstructorWithDefaultVisibility {
+        public constructor ConstructorWithDefaultVisibility(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class InternalConstructor {
+        internal constructor InternalConstructor(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class PrivateConstructor {
+        private constructor PrivateConstructor(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class ProtectedConstructor {
+        protected constructor ProtectedConstructor(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class PublicConstructor {
+        public constructor PublicConstructor(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/propertiesWithBackingFieldsInsideValueClass.fir.kt

@@ -0,0 +1,39 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+interface A {
+    val goodSize: Int
+}
+
+interface B {
+    val badSize: Int
+}
+
+@JvmInline
+value class Foo(val x: Int) : A, B {
+    val a0
+        get() = 0
+
+    val a1 = 0
+
+    var a2: Int
+        get() = 1
+        set(value) {}
+
+    var a3: Int = 0
+        get() = 1
+        set(value) {
+            field = value
+        }
+
+    override val goodSize: Int
+        get() = 0
+
+    override val badSize: Int = 0
+
+    lateinit var lateinitProperty: String
+}

compiler/testData/diagnostics/tests/valueClasses/propertiesWithBackingFieldsInsideValueClass.kt

@@ -0,0 +1,39 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+interface A {
+    val goodSize: Int
+}
+
+interface B {
+    val badSize: Int
+}
+
+@JvmInline
+value class Foo(val x: Int) : A, B {
+    val a0
+        get() = 0
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>val a1<!> = 0
+
+    var a2: Int
+        get() = 1
+        set(value) {}
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>var a3: Int<!> = 0
+        get() = 1
+        set(value) {
+            field = value
+        }
+
+    override val goodSize: Int
+        get() = 0
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>override val badSize: Int<!> = 0
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>lateinit var lateinitProperty: String<!>
+}

compiler/testData/diagnostics/tests/valueClasses/propertiesWithBackingFieldsInsideValueClass.txt

@@ -0,0 +1,40 @@
+package
+
+package kotlin {
+
+    public interface A {
+        public abstract val goodSize: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public interface B {
+        public abstract val badSize: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Foo : kotlin.A, kotlin.B {
+        public constructor Foo(/*0*/ x: kotlin.Int)
+        public final val a0: kotlin.Int
+        public final val a1: kotlin.Int = 0
+        public final var a2: kotlin.Int
+        public final var a3: kotlin.Int
+        public open override /*1*/ val badSize: kotlin.Int = 0
+        public open override /*1*/ val goodSize: kotlin.Int
+        public final lateinit var lateinitProperty: kotlin.String
+        public final val x: kotlin.Int
+        public open override /*2*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*2*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*2*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/recursiveValueClasses.fir.kt

@@ -0,0 +1,37 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Test1(val x: Test1)
+
+@JvmInline
+value class Test2A(val x: Test2B)
+@JvmInline
+value class Test2B(val x: Test2A)
+
+@JvmInline
+value class Test3A(val x: Test3B)
+@JvmInline
+value class Test3B(val x: Test3C)
+@JvmInline
+value class Test3C(val x: Test3A)
+
+@JvmInline
+value class TestNullable(val x: TestNullable?)
+
+@JvmInline
+value class TestRecursionInTypeArguments(val x: List<TestRecursionInTypeArguments>)
+
+@JvmInline
+value class TestRecursionInArray(val x: Array<TestRecursionInArray>)
+
+@JvmInline
+value class TestRecursionInUpperBounds<T : TestRecursionInUpperBounds<T>>(val x: T)
+
+@JvmInline
+value class Id<T>(val x: T)
+@JvmInline
+value class TestRecursionThroughId(val x: Id<TestRecursionThroughId>)

compiler/testData/diagnostics/tests/valueClasses/recursiveValueClasses.kt

@@ -0,0 +1,37 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Test1(val x: <!INLINE_CLASS_CANNOT_BE_RECURSIVE!>Test1<!>)
+
+@JvmInline
+value class Test2A(val x: <!INLINE_CLASS_CANNOT_BE_RECURSIVE!>Test2B<!>)
+@JvmInline
+value class Test2B(val x: <!INLINE_CLASS_CANNOT_BE_RECURSIVE!>Test2A<!>)
+
+@JvmInline
+value class Test3A(val x: <!INLINE_CLASS_CANNOT_BE_RECURSIVE!>Test3B<!>)
+@JvmInline
+value class Test3B(val x: <!INLINE_CLASS_CANNOT_BE_RECURSIVE!>Test3C<!>)
+@JvmInline
+value class Test3C(val x: <!INLINE_CLASS_CANNOT_BE_RECURSIVE!>Test3A<!>)
+
+@JvmInline
+value class TestNullable(val x: <!INLINE_CLASS_CANNOT_BE_RECURSIVE!>TestNullable?<!>)
+
+@JvmInline
+value class TestRecursionInTypeArguments(val x: List<TestRecursionInTypeArguments>)
+
+@JvmInline
+value class TestRecursionInArray(val x: Array<TestRecursionInArray>)
+
+@JvmInline
+value class TestRecursionInUpperBounds<T : TestRecursionInUpperBounds<T>>(val x: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>T<!>)
+
+@JvmInline
+value class Id<T>(val x: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>T<!>)
+@JvmInline
+value class TestRecursionThroughId(val x: Id<TestRecursionThroughId>)

compiler/testData/diagnostics/tests/valueClasses/recursiveValueClasses.txt

@@ -0,0 +1,107 @@
+package
+
+package kotlin {
+
+    @kotlin.JvmInline public final value class Id</*0*/ T> {
+        public constructor Id</*0*/ T>(/*0*/ x: T)
+        public final val x: T
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test1 {
+        public constructor Test1(/*0*/ x: kotlin.Test1)
+        public final val x: kotlin.Test1
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test2A {
+        public constructor Test2A(/*0*/ x: kotlin.Test2B)
+        public final val x: kotlin.Test2B
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test2B {
+        public constructor Test2B(/*0*/ x: kotlin.Test2A)
+        public final val x: kotlin.Test2A
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test3A {
+        public constructor Test3A(/*0*/ x: kotlin.Test3B)
+        public final val x: kotlin.Test3B
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test3B {
+        public constructor Test3B(/*0*/ x: kotlin.Test3C)
+        public final val x: kotlin.Test3C
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test3C {
+        public constructor Test3C(/*0*/ x: kotlin.Test3A)
+        public final val x: kotlin.Test3A
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestNullable {
+        public constructor TestNullable(/*0*/ x: kotlin.TestNullable?)
+        public final val x: kotlin.TestNullable?
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestRecursionInArray {
+        public constructor TestRecursionInArray(/*0*/ x: kotlin.Array<kotlin.TestRecursionInArray>)
+        public final val x: kotlin.Array<kotlin.TestRecursionInArray>
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestRecursionInTypeArguments {
+        public constructor TestRecursionInTypeArguments(/*0*/ x: kotlin.collections.List<kotlin.TestRecursionInTypeArguments>)
+        public final val x: kotlin.collections.List<kotlin.TestRecursionInTypeArguments>
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestRecursionInUpperBounds</*0*/ T : kotlin.TestRecursionInUpperBounds<T>> {
+        public constructor TestRecursionInUpperBounds</*0*/ T : kotlin.TestRecursionInUpperBounds<T>>(/*0*/ x: T)
+        public final val x: T
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestRecursionThroughId {
+        public constructor TestRecursionThroughId(/*0*/ x: kotlin.Id<kotlin.TestRecursionThroughId>)
+        public final val x: kotlin.Id<kotlin.TestRecursionThroughId>
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/reservedMembersAndConstructsInsideValueClass.fir.kt

@@ -0,0 +1,54 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class IC1(val x: Any) {
+    fun box() {}
+    fun box(x: Any) {}
+
+    fun unbox() {}
+    fun unbox(x: Any) {}
+
+    override fun equals(other: Any?): Boolean = true
+    override fun hashCode(): Int = 0
+}
+
+@JvmInline
+value class IC2(val x: Any) {
+    fun box(x: Any) {}
+    fun box(): Any = TODO()
+
+    fun unbox(x: Any) {}
+    fun unbox(): Any = TODO()
+
+    fun equals(my: Any, other: Any): Boolean = true
+    fun hashCode(a: Any): Int = 0
+}
+
+@JvmInline
+value class IC3(val x: Any) {
+    fun box(x: Any): Any = TODO()
+    fun unbox(x: Any): Any = TODO()
+
+    fun equals(): Boolean = true
+}
+
+interface WithBox {
+    fun box(): String
+}
+
+@JvmInline
+value class IC4(val s: String) : WithBox {
+    override fun box(): String = ""
+}
+
+@JvmInline
+value class IC5(val a: String) {
+    constructor(i: Int) : this(i.toString()) {
+        TODO("something")
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/reservedMembersAndConstructsInsideValueClass.kt

@@ -0,0 +1,54 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class IC1(val x: Any) {
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>box<!>() {}
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>box<!>(x: Any) {}
+
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>unbox<!>() {}
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>unbox<!>(x: Any) {}
+
+    override fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>equals<!>(other: Any?): Boolean = true
+    override fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>hashCode<!>(): Int = 0
+}
+
+@JvmInline
+value class IC2(val x: Any) {
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>box<!>(x: Any) {}
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>box<!>(): Any = TODO()
+
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>unbox<!>(x: Any) {}
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>unbox<!>(): Any = TODO()
+
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>equals<!>(my: Any, other: Any): Boolean = true
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>hashCode<!>(a: Any): Int = 0
+}
+
+@JvmInline
+value class IC3(val x: Any) {
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>box<!>(x: Any): Any = TODO()
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>unbox<!>(x: Any): Any = TODO()
+
+    fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>equals<!>(): Boolean = true
+}
+
+interface WithBox {
+    fun box(): String
+}
+
+@JvmInline
+value class IC4(val s: String) : WithBox {
+    override fun <!RESERVED_MEMBER_INSIDE_INLINE_CLASS!>box<!>(): String = ""
+}
+
+@JvmInline
+value class IC5(val a: String) {
+    constructor(i: Int) : this(i.toString()) <!SECONDARY_CONSTRUCTOR_WITH_BODY_INSIDE_INLINE_CLASS!>{<!>
+        TODO("something")
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/reservedMembersAndConstructsInsideValueClass.txt

@@ -0,0 +1,73 @@
+package
+
+package kotlin {
+
+    @kotlin.JvmInline public final value class IC1 {
+        public constructor IC1(/*0*/ x: kotlin.Any)
+        public final val x: kotlin.Any
+        public final fun box(): kotlin.Unit
+        public final fun box(/*0*/ x: kotlin.Any): kotlin.Unit
+        public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+        public final fun unbox(): kotlin.Unit
+        public final fun unbox(/*0*/ x: kotlin.Any): kotlin.Unit
+    }
+
+    @kotlin.JvmInline public final value class IC2 {
+        public constructor IC2(/*0*/ x: kotlin.Any)
+        public final val x: kotlin.Any
+        public final fun box(): kotlin.Any
+        public final fun box(/*0*/ x: kotlin.Any): kotlin.Unit
+        public final fun equals(/*0*/ my: kotlin.Any, /*1*/ other: kotlin.Any): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public final fun hashCode(/*0*/ a: kotlin.Any): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+        public final fun unbox(): kotlin.Any
+        public final fun unbox(/*0*/ x: kotlin.Any): kotlin.Unit
+    }
+
+    @kotlin.JvmInline public final value class IC3 {
+        public constructor IC3(/*0*/ x: kotlin.Any)
+        public final val x: kotlin.Any
+        public final fun box(/*0*/ x: kotlin.Any): kotlin.Any
+        public final fun equals(): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+        public final fun unbox(/*0*/ x: kotlin.Any): kotlin.Any
+    }
+
+    @kotlin.JvmInline public final value class IC4 : kotlin.WithBox {
+        public constructor IC4(/*0*/ s: kotlin.String)
+        public final val s: kotlin.String
+        public open override /*1*/ fun box(): kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class IC5 {
+        public constructor IC5(/*0*/ i: kotlin.Int)
+        public constructor IC5(/*0*/ a: kotlin.String)
+        public final val a: kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public interface WithBox {
+        public abstract fun box(): kotlin.String
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/unsignedLiteralsWithoutArtifactOnClasspath.fir.kt

@@ -0,0 +1,3 @@
+val u1 = 1u
+val u2 = 0xFu
+val u3 = 0b1u

compiler/testData/diagnostics/tests/valueClasses/unsignedLiteralsWithoutArtifactOnClasspath.kt

@@ -0,0 +1,3 @@
+val u1 = <!UNSIGNED_LITERAL_WITHOUT_DECLARATIONS_ON_CLASSPATH!>1u<!>
+val u2 = <!UNSIGNED_LITERAL_WITHOUT_DECLARATIONS_ON_CLASSPATH!>0xFu<!>
+val u3 = <!UNSIGNED_LITERAL_WITHOUT_DECLARATIONS_ON_CLASSPATH!>0b1u<!>

compiler/testData/diagnostics/tests/valueClasses/unsignedLiteralsWithoutArtifactOnClasspath.txt

@@ -0,0 +1,5 @@
+package
+
+public val u1: [ERROR : Type cannot be resolved. Please make sure you have the required dependencies for unsigned types in the classpath]
+public val u2: [ERROR : Type cannot be resolved. Please make sure you have the required dependencies for unsigned types in the classpath]
+public val u3: [ERROR : Type cannot be resolved. Please make sure you have the required dependencies for unsigned types in the classpath]

compiler/testData/diagnostics/tests/valueClasses/valueClassCanOnlyImplementInterfaces.fir.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+abstract class AbstractBaseClass
+
+open class OpenBaseClass
+
+interface BaseInterface
+
+@JvmInline
+value class TestExtendsAbstractClass(val x: Int) : AbstractBaseClass()
+
+@JvmInline
+value class TestExtendsOpenClass(val x: Int) : OpenBaseClass()
+
+@JvmInline
+value class TestImplementsInterface(val x: Int) : BaseInterface

compiler/testData/diagnostics/tests/valueClasses/valueClassCanOnlyImplementInterfaces.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+abstract class AbstractBaseClass
+
+open class OpenBaseClass
+
+interface BaseInterface
+
+@JvmInline
+value class TestExtendsAbstractClass(val x: Int) : <!INLINE_CLASS_CANNOT_EXTEND_CLASSES!>AbstractBaseClass<!>()
+
+@JvmInline
+value class TestExtendsOpenClass(val x: Int) : <!INLINE_CLASS_CANNOT_EXTEND_CLASSES!>OpenBaseClass<!>()
+
+@JvmInline
+value class TestImplementsInterface(val x: Int) : BaseInterface

compiler/testData/diagnostics/tests/valueClasses/valueClassCanOnlyImplementInterfaces.txt

@@ -0,0 +1,55 @@
+package
+
+package kotlin {
+
+    public abstract class AbstractBaseClass {
+        public constructor AbstractBaseClass()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public interface BaseInterface {
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public open class OpenBaseClass {
+        public constructor OpenBaseClass()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestExtendsAbstractClass : kotlin.AbstractBaseClass {
+        public constructor TestExtendsAbstractClass(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestExtendsOpenClass : kotlin.OpenBaseClass {
+        public constructor TestExtendsOpenClass(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class TestImplementsInterface : kotlin.BaseInterface {
+        public constructor TestImplementsInterface(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/valueClassCannotImplementInterfaceByDelegation.fir.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+interface IFoo
+
+object FooImpl : IFoo
+
+@JvmInline
+value class Test1(val x: Any) : IFoo by FooImpl
+
+@JvmInline
+value class Test2(val x: IFoo) : IFoo by x

compiler/testData/diagnostics/tests/valueClasses/valueClassCannotImplementInterfaceByDelegation.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+interface IFoo
+
+object FooImpl : IFoo
+
+@JvmInline
+value class Test1(val x: Any) : <!INLINE_CLASS_CANNOT_IMPLEMENT_INTERFACE_BY_DELEGATION!>IFoo by FooImpl<!>
+
+@JvmInline
+value class Test2(val x: IFoo) : <!INLINE_CLASS_CANNOT_IMPLEMENT_INTERFACE_BY_DELEGATION!>IFoo by x<!>

compiler/testData/diagnostics/tests/valueClasses/valueClassCannotImplementInterfaceByDelegation.txt

@@ -0,0 +1,40 @@
+package
+
+package kotlin {
+
+    public object FooImpl : kotlin.IFoo {
+        private constructor FooImpl()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public interface IFoo {
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test1 : kotlin.IFoo {
+        public constructor Test1(/*0*/ x: kotlin.Any)
+        public final val x: kotlin.Any
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test2 : kotlin.IFoo {
+        public constructor Test2(/*0*/ x: kotlin.IFoo)
+        public final val x: kotlin.IFoo
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/valueClassConstructorParameterWithDefaultValue.kt

@@ -0,0 +1,9 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Test(val x: Int = 42)

compiler/testData/diagnostics/tests/valueClasses/valueClassConstructorParameterWithDefaultValue.txt

@@ -0,0 +1,19 @@
+package
+
+package kotlin {
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Test {
+        public constructor Test(/*0*/ x: kotlin.Int = ...)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/valueClassDeclarationCheck.fir.kt

@@ -0,0 +1,51 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class A0(val x: Int)
+
+@JvmInline
+value class A1
+@JvmInline
+value class A2()
+@JvmInline
+value class A3(x: Int)
+@JvmInline
+value class A4(var x: Int)
+@JvmInline
+value class A5(val x: Int, val y: Int)
+@JvmInline
+value class A6(x: Int, val y: Int)
+@JvmInline
+value class A7(vararg val x: Int)
+@JvmInline
+value class A8(open val x: Int)
+@JvmInline
+value class A9(final val x: Int)
+
+class B1 {
+    companion object {
+        @JvmInline
+        value class C1(val x: Int)
+    }
+
+    @JvmInline
+    value class C2(val x: Int)
+}
+
+object B2 {
+    @JvmInline
+    value class C3(val x: Int)
+}
+
+@JvmInline
+final value class D0(val x: Int)
+open value class D1(val x: Int)
+abstract value class D2(val x: Int)
+sealed value class D3(val x: Int)
+
+<!INCOMPATIBLE_MODIFIERS!>value<!> <!INCOMPATIBLE_MODIFIERS!>data<!> class D4(val x: String)

compiler/testData/diagnostics/tests/valueClasses/valueClassDeclarationCheck.kt

@@ -0,0 +1,51 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class A0(val x: Int)
+
+@JvmInline
+<!ABSENCE_OF_PRIMARY_CONSTRUCTOR_FOR_INLINE_CLASS!>value<!> class A1
+@JvmInline
+value class A2<!INLINE_CLASS_CONSTRUCTOR_WRONG_PARAMETERS_SIZE!>()<!>
+@JvmInline
+value class A3(<!INLINE_CLASS_CONSTRUCTOR_NOT_FINAL_READ_ONLY_PARAMETER!>x: Int<!>)
+@JvmInline
+value class A4(<!INLINE_CLASS_CONSTRUCTOR_NOT_FINAL_READ_ONLY_PARAMETER!>var x: Int<!>)
+@JvmInline
+value class A5<!INLINE_CLASS_CONSTRUCTOR_WRONG_PARAMETERS_SIZE!>(val x: Int, val y: Int)<!>
+@JvmInline
+value class A6<!INLINE_CLASS_CONSTRUCTOR_WRONG_PARAMETERS_SIZE!>(x: Int, val y: Int)<!>
+@JvmInline
+value class A7(<!INLINE_CLASS_CONSTRUCTOR_NOT_FINAL_READ_ONLY_PARAMETER!>vararg val x: Int<!>)
+@JvmInline
+value class A8(<!INLINE_CLASS_CONSTRUCTOR_NOT_FINAL_READ_ONLY_PARAMETER!><!NON_FINAL_MEMBER_IN_FINAL_CLASS!>open<!> val x: Int<!>)
+@JvmInline
+value class A9(final val x: Int)
+
+class B1 {
+    companion object {
+        @JvmInline
+        <!INLINE_CLASS_NOT_TOP_LEVEL!>value<!> class C1(val x: Int)
+    }
+
+    @JvmInline
+    <!INLINE_CLASS_NOT_TOP_LEVEL!>value<!> class C2(val x: Int)
+}
+
+object B2 {
+    @JvmInline
+    <!INLINE_CLASS_NOT_TOP_LEVEL!>value<!> class C3(val x: Int)
+}
+
+@JvmInline
+final value class D0(val x: Int)
+<!INLINE_CLASS_NOT_FINAL!>open<!> value class D1(val x: Int)
+<!INLINE_CLASS_NOT_FINAL!>abstract<!> value class D2(val x: Int)
+<!INLINE_CLASS_NOT_FINAL!>sealed<!> value class D3(val x: Int)
+
+<!INCOMPATIBLE_MODIFIERS, VALUE_CLASS_WITHOUT_JVM_INLINE_ANNOTATION!>value<!> <!INCOMPATIBLE_MODIFIERS!>data<!> class D4(val x: String)

compiler/testData/diagnostics/tests/valueClasses/valueClassDeclarationCheck.txt

@@ -0,0 +1,176 @@
+package
+
+package kotlin {
+
+    @kotlin.JvmInline public final value class A0 {
+        public constructor A0(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A1 {
+        public constructor A1()
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A2 {
+        public constructor A2()
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A3 {
+        public constructor A3(/*0*/ x: kotlin.Int)
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A4 {
+        public constructor A4(/*0*/ x: kotlin.Int)
+        public final var x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A5 {
+        public constructor A5(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
+        public final val x: kotlin.Int
+        public final val y: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A6 {
+        public constructor A6(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
+        public final val y: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A7 {
+        public constructor A7(/*0*/ vararg x: kotlin.Int /*kotlin.IntArray*/)
+        public final val x: kotlin.IntArray
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A8 {
+        public constructor A8(/*0*/ x: kotlin.Int)
+        public open val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class A9 {
+        public constructor A9(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final class B1 {
+        public constructor B1()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+        @kotlin.JvmInline public final value class C2 {
+            public constructor C2(/*0*/ x: kotlin.Int)
+            public final val x: kotlin.Int
+            public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+            public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+            public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+        }
+
+        public companion object Companion {
+            private constructor Companion()
+            public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+            public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+            public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+            @kotlin.JvmInline public final value class C1 {
+                public constructor C1(/*0*/ x: kotlin.Int)
+                public final val x: kotlin.Int
+                public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+                public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+                public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+            }
+        }
+    }
+
+    public object B2 {
+        private constructor B2()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+        @kotlin.JvmInline public final value class C3 {
+            public constructor C3(/*0*/ x: kotlin.Int)
+            public final val x: kotlin.Int
+            public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+            public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+            public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+        }
+    }
+
+    @kotlin.JvmInline public final value class D0 {
+        public constructor D0(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public open value class D1 {
+        public constructor D1(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public abstract value class D2 {
+        public constructor D2(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public sealed value class D3 {
+        private constructor D3(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final data value class D4 {
+        public constructor D4(/*0*/ x: kotlin.String)
+        public final val x: kotlin.String
+        public final operator /*synthesized*/ fun component1(): kotlin.String
+        public final /*synthesized*/ fun copy(/*0*/ x: kotlin.String = ...): kotlin.D4
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/valueClassImplementsCollection.kt

@@ -0,0 +1,19 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class UInt(val x: Int)
+
+@JvmInline
+value class UIntArray(private val storage: IntArray) : Collection<UInt> {
+    public override val size: Int get() = storage.size
+
+    override operator fun iterator() = TODO()
+    override fun contains(element: UInt): Boolean = TODO()
+    override fun containsAll(elements: Collection<UInt>): Boolean = TODO()
+    override fun isEmpty(): Boolean = TODO()
+}

compiler/testData/diagnostics/tests/valueClasses/valueClassImplementsCollection.txt

@@ -0,0 +1,32 @@
+package
+
+package kotlin {
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class UInt {
+        public constructor UInt(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class UIntArray : kotlin.collections.Collection<kotlin.UInt> {
+        public constructor UIntArray(/*0*/ storage: kotlin.IntArray)
+        public open override /*1*/ val size: kotlin.Int
+        private final val storage: kotlin.IntArray
+        public open override /*1*/ fun contains(/*0*/ element: kotlin.UInt): kotlin.Boolean
+        public open override /*1*/ fun containsAll(/*0*/ elements: kotlin.collections.Collection<kotlin.UInt>): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ fun isEmpty(): kotlin.Boolean
+        public open override /*1*/ fun iterator(): kotlin.Nothing
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/valueClassWithForbiddenUnderlyingType.fir.kt

@@ -0,0 +1,30 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo<T>(val x: T)
+@JvmInline
+value class FooNullable<T>(val x: T?)
+
+@JvmInline
+value class FooGenericArray<T>(val x: Array<T>)
+@JvmInline
+value class FooGenericArray2<T>(val x: Array<Array<T>>)
+
+@JvmInline
+value class FooStarProjectedArray(val x: Array<*>)
+@JvmInline
+value class FooStarProjectedArray2(val x: Array<Array<*>>)
+
+@JvmInline
+value class Bar(val u: Unit)
+@JvmInline
+value class BarNullable(val u: Unit?)
+
+@JvmInline
+value class Baz(val u: Nothing)
+@JvmInline
+value class BazNullable(val u: Nothing?)

compiler/testData/diagnostics/tests/valueClasses/valueClassWithForbiddenUnderlyingType.kt

@@ -0,0 +1,30 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo<T>(val x: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>T<!>)
+@JvmInline
+value class FooNullable<T>(val x: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>T?<!>)
+
+@JvmInline
+value class FooGenericArray<T>(val x: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>Array<T><!>)
+@JvmInline
+value class FooGenericArray2<T>(val x: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>Array<Array<T>><!>)
+
+@JvmInline
+value class FooStarProjectedArray(val x: Array<*>)
+@JvmInline
+value class FooStarProjectedArray2(val x: Array<Array<*>>)
+
+@JvmInline
+value class Bar(val u: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>Unit<!>)
+@JvmInline
+value class BarNullable(val u: Unit?)
+
+@JvmInline
+value class Baz(val u: <!INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE!>Nothing<!>)
+@JvmInline
+value class BazNullable(val u: Nothing?)

compiler/testData/diagnostics/tests/valueClasses/valueClassWithForbiddenUnderlyingType.txt

@@ -0,0 +1,91 @@
+package
+
+package kotlin {
+
+    @kotlin.JvmInline public final value class Bar {
+        public constructor Bar(/*0*/ u: kotlin.Unit)
+        public final val u: kotlin.Unit
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class BarNullable {
+        public constructor BarNullable(/*0*/ u: kotlin.Unit?)
+        public final val u: kotlin.Unit?
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Baz {
+        public constructor Baz(/*0*/ u: kotlin.Nothing)
+        public final val u: kotlin.Nothing
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class BazNullable {
+        public constructor BazNullable(/*0*/ u: kotlin.Nothing?)
+        public final val u: kotlin.Nothing?
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Foo</*0*/ T> {
+        public constructor Foo</*0*/ T>(/*0*/ x: T)
+        public final val x: T
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class FooGenericArray</*0*/ T> {
+        public constructor FooGenericArray</*0*/ T>(/*0*/ x: kotlin.Array<T>)
+        public final val x: kotlin.Array<T>
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class FooGenericArray2</*0*/ T> {
+        public constructor FooGenericArray2</*0*/ T>(/*0*/ x: kotlin.Array<kotlin.Array<T>>)
+        public final val x: kotlin.Array<kotlin.Array<T>>
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class FooNullable</*0*/ T> {
+        public constructor FooNullable</*0*/ T>(/*0*/ x: T?)
+        public final val x: T?
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class FooStarProjectedArray {
+        public constructor FooStarProjectedArray(/*0*/ x: kotlin.Array<*>)
+        public final val x: kotlin.Array<*>
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class FooStarProjectedArray2 {
+        public constructor FooStarProjectedArray2(/*0*/ x: kotlin.Array<kotlin.Array<*>>)
+        public final val x: kotlin.Array<kotlin.Array<*>>
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/valueClassesInsideAnnotations.fir.kt

@@ -0,0 +1,18 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+import kotlin.reflect.KClass
+
+annotation class JvmInline
+
+@JvmInline
+value class MyInt(val x: Int)
+@JvmInline
+value class MyString(val x: String)
+
+annotation class Ann1(val a: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>MyInt<!>)
+annotation class Ann2(val a: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>Array<MyString><!>)
+annotation class Ann3(vararg val a: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>MyInt<!>)
+
+annotation class Ann4(val a: KClass<MyInt>)

compiler/testData/diagnostics/tests/valueClasses/valueClassesInsideAnnotations.kt

@@ -0,0 +1,18 @@
+// !LANGUAGE: +InlineClasses
+
+package kotlin
+
+import kotlin.reflect.KClass
+
+annotation class JvmInline
+
+@JvmInline
+value class MyInt(val x: Int)
+@JvmInline
+value class MyString(val x: String)
+
+annotation class Ann1(val a: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>MyInt<!>)
+annotation class Ann2(val a: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>Array<MyString><!>)
+annotation class Ann3(<!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> val a: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>MyInt<!>)
+
+annotation class Ann4(val a: KClass<MyInt>)

compiler/testData/diagnostics/tests/valueClasses/valueClassesInsideAnnotations.txt

@@ -0,0 +1,59 @@
+package
+
+package kotlin {
+
+    public final annotation class Ann1 : kotlin.Annotation {
+        public constructor Ann1(/*0*/ a: kotlin.MyInt)
+        public final val a: kotlin.MyInt
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class Ann2 : kotlin.Annotation {
+        public constructor Ann2(/*0*/ a: kotlin.Array<kotlin.MyString>)
+        public final val a: kotlin.Array<kotlin.MyString>
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class Ann3 : kotlin.Annotation {
+        public constructor Ann3(/*0*/ vararg a: kotlin.MyInt /*kotlin.Array<out kotlin.MyInt>*/)
+        public final val a: kotlin.Array<out kotlin.MyInt>
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class Ann4 : kotlin.Annotation {
+        public constructor Ann4(/*0*/ a: kotlin.reflect.KClass<kotlin.MyInt>)
+        public final val a: kotlin.reflect.KClass<kotlin.MyInt>
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class MyInt {
+        public constructor MyInt(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class MyString {
+        public constructor MyString(/*0*/ x: kotlin.String)
+        public final val x: kotlin.String
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/valueClasses/varargsOnParametersOfValueClassType.fir.kt

@@ -0,0 +1,26 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER, -UNUSED_VARIABLE, -UNUSED_ANONYMOUS_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+
+fun f1(vararg a: Foo) {}
+fun f2(vararg a: Foo?) {}
+
+class A {
+    fun f3(a0: Int, vararg a1: Foo) {
+        fun f4(vararg a: Foo) {}
+
+        val g = fun (vararg v: Foo) {}
+    }
+}
+
+class B(vararg val s: Foo) {
+    constructor(a: Int, vararg s: Foo) : this(*s)
+}
+
+annotation class Ann(vararg val f: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>Foo<!>)

compiler/testData/diagnostics/tests/valueClasses/varargsOnParametersOfValueClassType.kt

@@ -0,0 +1,26 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER, -UNUSED_VARIABLE, -UNUSED_ANONYMOUS_PARAMETER
+
+package kotlin
+
+annotation class JvmInline
+
+@JvmInline
+value class Foo(val x: Int)
+
+fun f1(<!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> a: Foo) {}
+fun f2(<!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> a: Foo?) {}
+
+class A {
+    fun f3(a0: Int, <!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> a1: Foo) {
+        fun f4(<!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> a: Foo) {}
+
+        val g = fun (<!USELESS_VARARG_ON_PARAMETER!><!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> v: Foo<!>) {}
+    }
+}
+
+class B(<!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> val s: Foo) {
+    constructor(a: Int, <!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> s: Foo) : this(*s)
+}
+
+annotation class Ann(<!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> val f: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>Foo<!>)

compiler/testData/diagnostics/tests/valueClasses/varargsOnParametersOfValueClassType.txt

@@ -0,0 +1,46 @@
+package
+
+package kotlin {
+    public fun f1(/*0*/ vararg a: kotlin.Foo /*kotlin.Array<out kotlin.Foo>*/): kotlin.Unit
+    public fun f2(/*0*/ vararg a: kotlin.Foo? /*kotlin.Array<out kotlin.Foo?>*/): kotlin.Unit
+
+    public final class A {
+        public constructor A()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final fun f3(/*0*/ a0: kotlin.Int, /*1*/ vararg a1: kotlin.Foo /*kotlin.Array<out kotlin.Foo>*/): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class Ann : kotlin.Annotation {
+        public constructor Ann(/*0*/ vararg f: kotlin.Foo /*kotlin.Array<out kotlin.Foo>*/)
+        public final val f: kotlin.Array<out kotlin.Foo>
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class B {
+        public constructor B(/*0*/ vararg s: kotlin.Foo /*kotlin.Array<out kotlin.Foo>*/)
+        public constructor B(/*0*/ a: kotlin.Int, /*1*/ vararg s: kotlin.Foo /*kotlin.Array<out kotlin.Foo>*/)
+        public final val s: kotlin.Array<out kotlin.Foo>
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    @kotlin.JvmInline public final value class Foo {
+        public constructor Foo(/*0*/ x: kotlin.Int)
+        public final val x: kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+
+    public final annotation class JvmInline : kotlin.Annotation {
+        public constructor JvmInline()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/tests-gen/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -25050,6 +25050,129 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTestWithFirVali
             }
         }
 
+        @TestMetadata("compiler/testData/diagnostics/tests/valueClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class ValueClasses extends AbstractDiagnosticsTestWithFirValidation {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest(this::doTest, this, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInValueClasses() throws Exception {
+                KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/valueClasses"), Pattern.compile("^(.*)\\.kts?$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
+            }
+
+            @TestMetadata("basicValueClassDeclaration.kt")
+            public void testBasicValueClassDeclaration() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclaration.kt");
+            }
+
+            @TestMetadata("basicValueClassDeclarationDisabled.kt")
+            public void testBasicValueClassDeclarationDisabled() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclarationDisabled.kt");
+            }
+
+            @TestMetadata("constructorsJvmSignaturesClash.kt")
+            public void testConstructorsJvmSignaturesClash() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/constructorsJvmSignaturesClash.kt");
+            }
+
+            @TestMetadata("delegatedPropertyInValueClass.kt")
+            public void testDelegatedPropertyInValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/delegatedPropertyInValueClass.kt");
+            }
+
+            @TestMetadata("functionsJvmSignaturesClash.kt")
+            public void testFunctionsJvmSignaturesClash() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesClash.kt");
+            }
+
+            @TestMetadata("functionsJvmSignaturesConflictOnInheritance.kt")
+            public void testFunctionsJvmSignaturesConflictOnInheritance() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesConflictOnInheritance.kt");
+            }
+
+            @TestMetadata("identityComparisonWithValueClasses.kt")
+            public void testIdentityComparisonWithValueClasses() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/identityComparisonWithValueClasses.kt");
+            }
+
+            @TestMetadata("lateinitValueClasses.kt")
+            public void testLateinitValueClasses() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/lateinitValueClasses.kt");
+            }
+
+            @TestMetadata("presenceOfInitializerBlockInsideValueClass.kt")
+            public void testPresenceOfInitializerBlockInsideValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/presenceOfInitializerBlockInsideValueClass.kt");
+            }
+
+            @TestMetadata("presenceOfPublicPrimaryConstructorForValueClass.kt")
+            public void testPresenceOfPublicPrimaryConstructorForValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/presenceOfPublicPrimaryConstructorForValueClass.kt");
+            }
+
+            @TestMetadata("propertiesWithBackingFieldsInsideValueClass.kt")
+            public void testPropertiesWithBackingFieldsInsideValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/propertiesWithBackingFieldsInsideValueClass.kt");
+            }
+
+            @TestMetadata("recursiveValueClasses.kt")
+            public void testRecursiveValueClasses() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/recursiveValueClasses.kt");
+            }
+
+            @TestMetadata("reservedMembersAndConstructsInsideValueClass.kt")
+            public void testReservedMembersAndConstructsInsideValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/reservedMembersAndConstructsInsideValueClass.kt");
+            }
+
+            @TestMetadata("unsignedLiteralsWithoutArtifactOnClasspath.kt")
+            public void testUnsignedLiteralsWithoutArtifactOnClasspath() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/unsignedLiteralsWithoutArtifactOnClasspath.kt");
+            }
+
+            @TestMetadata("valueClassCanOnlyImplementInterfaces.kt")
+            public void testValueClassCanOnlyImplementInterfaces() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassCanOnlyImplementInterfaces.kt");
+            }
+
+            @TestMetadata("valueClassCannotImplementInterfaceByDelegation.kt")
+            public void testValueClassCannotImplementInterfaceByDelegation() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassCannotImplementInterfaceByDelegation.kt");
+            }
+
+            @TestMetadata("valueClassConstructorParameterWithDefaultValue.kt")
+            public void testValueClassConstructorParameterWithDefaultValue() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassConstructorParameterWithDefaultValue.kt");
+            }
+
+            @TestMetadata("valueClassDeclarationCheck.kt")
+            public void testValueClassDeclarationCheck() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassDeclarationCheck.kt");
+            }
+
+            @TestMetadata("valueClassImplementsCollection.kt")
+            public void testValueClassImplementsCollection() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassImplementsCollection.kt");
+            }
+
+            @TestMetadata("valueClassWithForbiddenUnderlyingType.kt")
+            public void testValueClassWithForbiddenUnderlyingType() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassWithForbiddenUnderlyingType.kt");
+            }
+
+            @TestMetadata("valueClassesInsideAnnotations.kt")
+            public void testValueClassesInsideAnnotations() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassesInsideAnnotations.kt");
+            }
+
+            @TestMetadata("varargsOnParametersOfValueClassType.kt")
+            public void testVarargsOnParametersOfValueClassType() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/varargsOnParametersOfValueClassType.kt");
+            }
+        }
+
         @TestMetadata("compiler/testData/diagnostics/tests/varargs")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)

compiler/tests-gen/org/jetbrains/kotlin/checkers/javac/DiagnosticsUsingJavacTestGenerated.java

@@ -24970,6 +24970,129 @@ public class DiagnosticsUsingJavacTestGenerated extends AbstractDiagnosticsUsing
             }
         }
 
+        @TestMetadata("compiler/testData/diagnostics/tests/valueClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class ValueClasses extends AbstractDiagnosticsUsingJavacTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest(this::doTest, this, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInValueClasses() throws Exception {
+                KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/valueClasses"), Pattern.compile("^(.+)\\.kt$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
+            }
+
+            @TestMetadata("basicValueClassDeclaration.kt")
+            public void testBasicValueClassDeclaration() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclaration.kt");
+            }
+
+            @TestMetadata("basicValueClassDeclarationDisabled.kt")
+            public void testBasicValueClassDeclarationDisabled() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/basicValueClassDeclarationDisabled.kt");
+            }
+
+            @TestMetadata("constructorsJvmSignaturesClash.kt")
+            public void testConstructorsJvmSignaturesClash() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/constructorsJvmSignaturesClash.kt");
+            }
+
+            @TestMetadata("delegatedPropertyInValueClass.kt")
+            public void testDelegatedPropertyInValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/delegatedPropertyInValueClass.kt");
+            }
+
+            @TestMetadata("functionsJvmSignaturesClash.kt")
+            public void testFunctionsJvmSignaturesClash() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesClash.kt");
+            }
+
+            @TestMetadata("functionsJvmSignaturesConflictOnInheritance.kt")
+            public void testFunctionsJvmSignaturesConflictOnInheritance() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/functionsJvmSignaturesConflictOnInheritance.kt");
+            }
+
+            @TestMetadata("identityComparisonWithValueClasses.kt")
+            public void testIdentityComparisonWithValueClasses() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/identityComparisonWithValueClasses.kt");
+            }
+
+            @TestMetadata("lateinitValueClasses.kt")
+            public void testLateinitValueClasses() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/lateinitValueClasses.kt");
+            }
+
+            @TestMetadata("presenceOfInitializerBlockInsideValueClass.kt")
+            public void testPresenceOfInitializerBlockInsideValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/presenceOfInitializerBlockInsideValueClass.kt");
+            }
+
+            @TestMetadata("presenceOfPublicPrimaryConstructorForValueClass.kt")
+            public void testPresenceOfPublicPrimaryConstructorForValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/presenceOfPublicPrimaryConstructorForValueClass.kt");
+            }
+
+            @TestMetadata("propertiesWithBackingFieldsInsideValueClass.kt")
+            public void testPropertiesWithBackingFieldsInsideValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/propertiesWithBackingFieldsInsideValueClass.kt");
+            }
+
+            @TestMetadata("recursiveValueClasses.kt")
+            public void testRecursiveValueClasses() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/recursiveValueClasses.kt");
+            }
+
+            @TestMetadata("reservedMembersAndConstructsInsideValueClass.kt")
+            public void testReservedMembersAndConstructsInsideValueClass() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/reservedMembersAndConstructsInsideValueClass.kt");
+            }
+
+            @TestMetadata("unsignedLiteralsWithoutArtifactOnClasspath.kt")
+            public void testUnsignedLiteralsWithoutArtifactOnClasspath() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/unsignedLiteralsWithoutArtifactOnClasspath.kt");
+            }
+
+            @TestMetadata("valueClassCanOnlyImplementInterfaces.kt")
+            public void testValueClassCanOnlyImplementInterfaces() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassCanOnlyImplementInterfaces.kt");
+            }
+
+            @TestMetadata("valueClassCannotImplementInterfaceByDelegation.kt")
+            public void testValueClassCannotImplementInterfaceByDelegation() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassCannotImplementInterfaceByDelegation.kt");
+            }
+
+            @TestMetadata("valueClassConstructorParameterWithDefaultValue.kt")
+            public void testValueClassConstructorParameterWithDefaultValue() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassConstructorParameterWithDefaultValue.kt");
+            }
+
+            @TestMetadata("valueClassDeclarationCheck.kt")
+            public void testValueClassDeclarationCheck() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassDeclarationCheck.kt");
+            }
+
+            @TestMetadata("valueClassImplementsCollection.kt")
+            public void testValueClassImplementsCollection() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassImplementsCollection.kt");
+            }
+
+            @TestMetadata("valueClassWithForbiddenUnderlyingType.kt")
+            public void testValueClassWithForbiddenUnderlyingType() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassWithForbiddenUnderlyingType.kt");
+            }
+
+            @TestMetadata("valueClassesInsideAnnotations.kt")
+            public void testValueClassesInsideAnnotations() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/valueClassesInsideAnnotations.kt");
+            }
+
+            @TestMetadata("varargsOnParametersOfValueClassType.kt")
+            public void testVarargsOnParametersOfValueClassType() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/valueClasses/varargsOnParametersOfValueClassType.kt");
+            }
+        }
+
         @TestMetadata("compiler/testData/diagnostics/tests/varargs")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)

core/descriptors.jvm/src/org/jetbrains/kotlin/load/kotlin/descriptorBasedTypeSignatureMapping.kt

@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.builtins.isSuspendFunctionType
 import org.jetbrains.kotlin.builtins.transformSuspendFunctionToRuntimeFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.name.SpecialNames
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.checker.SimpleClassicTypeSystemContext
 import org.jetbrains.kotlin.types.typeUtil.replaceArgumentsWithStarProjections
@@ -115,7 +116,7 @@ fun <T : Any> mapType(
 
         descriptor is ClassDescriptor -> {
             // NB if inline class is recursive, it's ok to map it as wrapped
-            if (descriptor.isInline && !mode.needInlineClassWrapping) {
+            if (descriptor.isInlineClass() && !mode.needInlineClassWrapping) {
                 val expandedType = SimpleClassicTypeSystemContext.computeExpandedTypeForInlineClass(kotlinType) as KotlinType?
                 if (expandedType != null) {
                     return mapType(

core/descriptors.jvm/src/org/jetbrains/kotlin/resolve/jvm/inlineClassManglingRules.kt

@@ -17,7 +17,7 @@ import org.jetbrains.kotlin.types.typeUtil.representativeUpperBound
 fun shouldHideConstructorDueToInlineClassTypeValueParameters(descriptor: CallableMemberDescriptor): Boolean {
     val constructorDescriptor = descriptor as? ClassConstructorDescriptor ?: return false
     if (DescriptorVisibilities.isPrivate(constructorDescriptor.visibility)) return false
-    if (constructorDescriptor.constructedClass.isInline) return false
+    if (constructorDescriptor.constructedClass.isInlineClass()) return false
     if (DescriptorUtils.isSealedClass(constructorDescriptor.constructedClass)) return false
 
     // TODO inner class in inline class

core/descriptors/src/org/jetbrains/kotlin/resolve/DescriptorUtils.kt

@@ -24,6 +24,7 @@ import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils.getContainingClass
 import org.jetbrains.kotlin.resolve.constants.ConstantValue
 import org.jetbrains.kotlin.resolve.constants.EnumValue
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
 import org.jetbrains.kotlin.resolve.scopes.MemberScope
 import org.jetbrains.kotlin.types.KotlinType
@@ -445,7 +446,7 @@ fun DeclarationDescriptor.isAnnotationConstructor(): Boolean =
     this is ConstructorDescriptor && DescriptorUtils.isAnnotationClass(this.constructedClass)
 
 fun DeclarationDescriptor.isPrimaryConstructorOfInlineClass(): Boolean =
-    this is ConstructorDescriptor && this.isPrimary && this.constructedClass.isInline
+    this is ConstructorDescriptor && this.isPrimary && this.constructedClass.isInlineClass()
 
 @TypeRefinement
 fun ModuleDescriptor.getKotlinTypeRefiner(): KotlinTypeRefiner = getCapability(REFINER_CAPABILITY)?.value ?: KotlinTypeRefiner.Default

core/descriptors/src/org/jetbrains/kotlin/resolve/inlineClassesUtils.kt

@@ -6,18 +6,23 @@
 package org.jetbrains.kotlin.resolve
 
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeSubstitutor
 import org.jetbrains.kotlin.types.TypeUtils
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
+val JVM_INLINE_ANNOTATION = FqName("kotlin.JvmInline")
+
 fun ClassDescriptor.underlyingRepresentation(): ValueParameterDescriptor? {
-    if (!isInline) return null
+    if (!isInlineClass()) return null
     return unsubstitutedPrimaryConstructor?.valueParameters?.singleOrNull()
 }
 
-fun DeclarationDescriptor.isInlineClass() = this is ClassDescriptor && this.isInline
+// FIXME: DeserializedClassDescriptor in reflection do not have @JvmInline annotation, that we
+// FIXME: would like to check as well.
+fun DeclarationDescriptor.isInlineClass() = this is ClassDescriptor && (isInline || isValue)
 
 fun KotlinType.unsubstitutedUnderlyingParameter(): ValueParameterDescriptor? {
     return constructor.declarationDescriptor.safeAs<ClassDescriptor>()?.underlyingRepresentation()

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.hasExactAnnotation
 import org.jetbrains.kotlin.resolve.descriptorUtil.hasNoInferAnnotation
 import org.jetbrains.kotlin.resolve.descriptorUtil.isExactAnnotation
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.substitutedUnderlyingType
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.model.*
@@ -599,7 +600,7 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSy
 
     override fun TypeConstructorMarker.isInlineClass(): Boolean {
         require(this is TypeConstructor, this::errorMessage)
-        return (declarationDescriptor as? ClassDescriptor)?.isInline == true
+        return (declarationDescriptor as? ClassDescriptor)?.isInlineClass() == true
     }
 
     override fun TypeConstructorMarker.isInnerClass(): Boolean {

core/reflection.jvm/src/kotlin/reflect/jvm/internal/calls/InlineClassAwareCaller.kt

@@ -90,7 +90,7 @@ internal class InlineClassAwareCaller<out M : Member?>(
                 }
             } else {
                 val containingDeclaration = descriptor.containingDeclaration
-                if (containingDeclaration is ClassDescriptor && containingDeclaration.isInline) {
+                if (containingDeclaration is ClassDescriptor && containingDeclaration.isInlineClass()) {
                     kotlinParameterTypes.add(containingDeclaration.defaultType)
                 }
             }
@@ -180,7 +180,7 @@ internal fun KotlinType.toInlineClass(): Class<*>? =
     constructor.declarationDescriptor.toInlineClass()
 
 internal fun DeclarationDescriptor?.toInlineClass(): Class<*>? =
-    if (this is ClassDescriptor && isInline)
+    if (this is ClassDescriptor && isInlineClass())
         toJavaClass() ?: throw KotlinReflectionInternalError("Class object for the class $name cannot be found (classId=$classId)")
     else
         null

idea/idea-analysis/src/org/jetbrains/kotlin/idea/quickfix/TypeAccessibilityCheckerImpl.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.KtNamedDeclaration
 import org.jetbrains.kotlin.psi.KtTypeParameter
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameOrNull
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeProjection
 import org.jetbrains.kotlin.types.isError
@@ -101,7 +102,7 @@ private fun DeclarationDescriptor.collectAllTypes(): Sequence<FqName?> {
     return when (this) {
         is ClassConstructorDescriptor -> valueParameters.asSequence().map(ValueParameterDescriptor::getType)
             .flatMap(KotlinType::collectAllTypes)
-        is ClassDescriptor -> if (isInline) unsubstitutedPrimaryConstructor?.collectAllTypes().orEmpty() else {
+        is ClassDescriptor -> if (isInlineClass()) unsubstitutedPrimaryConstructor?.collectAllTypes().orEmpty() else {
             emptySequence()
         } + declaredTypeParameters.asSequence().flatMap(DeclarationDescriptor::collectAllTypes) + sequenceOf(fqNameOrNull())
         is CallableDescriptor -> {

idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMemberChooserObject.kt

@@ -144,7 +144,7 @@ fun OverrideMemberChooserObject.generateMember(
     val renderer = baseRenderer.withOptions {
         if (descriptor is ClassConstructorDescriptor && descriptor.isPrimary) {
             val containingClass = descriptor.containingDeclaration
-            if (containingClass.kind == ClassKind.ANNOTATION_CLASS || containingClass.isInline) {
+            if (containingClass.kind == ClassKind.ANNOTATION_CLASS || containingClass.isInline || containingClass.isValue) {
                 renderPrimaryConstructorParametersAsProperties = true
             }
         }

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

@@ -76,6 +76,7 @@ import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.bindingContextUtil.isUsedAsExpression
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.isInlineClassType
 import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
 import org.jetbrains.kotlin.util.findCallableMemberBySignature
@@ -513,7 +514,7 @@ class UnusedSymbolInspection : AbstractKotlinInspection() {
         return when {
             descriptor is ConstructorDescriptor -> {
                 val classDescriptor = descriptor.constructedClass
-                !classDescriptor.isInline && classDescriptor.visibility != DescriptorVisibilities.LOCAL
+                !classDescriptor.isInlineClass() && classDescriptor.visibility != DescriptorVisibilities.LOCAL
             }
             hasModifier(KtTokens.INTERNAL_KEYWORD) -> false
             descriptor !is FunctionDescriptor -> true

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/JsExternalChecker.kt

@@ -44,6 +44,7 @@ object JsExternalChecker : DeclarationChecker {
                 descriptor.isData -> "data class"
                 descriptor.isInner -> "inner class"
                 descriptor.isInline -> "inline class"
+                descriptor.isValue -> "value class"
                 descriptor.isFun -> "fun interface"
                 DescriptorUtils.isAnnotationClass(descriptor) -> "annotation class"
                 else -> null

js/js.translator/src/org/jetbrains/kotlin/js/translate/declaration/ClassTranslator.kt

@@ -131,7 +131,7 @@ class ClassTranslator private constructor(
         if (classDeclaration is KtClassOrObject) {
             when {
                 descriptor.isData -> JsDataClassGenerator(classDeclaration, context).generate()
-                descriptor.isInline -> JsInlineClassGenerator(classDeclaration, context).generate()
+                descriptor.isInline || descriptor.isValue -> JsInlineClassGenerator(classDeclaration, context).generate()
             }
         }
 

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/cir/factory/CirClassFactory.kt

@@ -16,6 +16,7 @@ import org.jetbrains.kotlin.descriptors.commonizer.cir.impl.CirClassImpl
 import org.jetbrains.kotlin.descriptors.commonizer.utils.compactMap
 import org.jetbrains.kotlin.descriptors.commonizer.utils.intern
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.isInlineClass
 
 object CirClassFactory {
     fun create(source: ClassDescriptor): CirClass = create(
@@ -28,7 +29,7 @@ object CirClassFactory {
         companion = source.companionObjectDescriptor?.name?.intern(),
         isCompanion = source.isCompanionObject,
         isData = source.isData,
-        isInline = source.isInline,
+        isInline = source.isInlineClass(),
         isInner = source.isInner,
         isExternal = source.isExternal
     ).apply {

native/commonizer/tests/org/jetbrains/kotlin/descriptors/commonizer/utils/ComparingDeclarationsVisitor.kt

@@ -229,6 +229,7 @@ internal class ComparingDeclarationsVisitor(
         context.assertFieldsEqual(expected::isCompanionObject, actual::isCompanionObject)
         context.assertFieldsEqual(expected::isData, actual::isData)
         context.assertFieldsEqual(expected::isInline, actual::isInline)
+        context.assertFieldsEqual(expected::isValue, actual::isValue)
         context.assertFieldsEqual(expected::isInner, actual::isInner)
         context.assertFieldsEqual(expected::isExternal, actual::isExternal)
         context.assertFieldsEqual(expected::isExpect, actual::isExpect)

plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/diagnostic/SerializationPluginDeclarationChecker.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassOrAny
 import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperInterfaces
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
 import org.jetbrains.kotlin.resolve.hasBackingField
+import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.isInlineClassType
 import org.jetbrains.kotlin.resolve.jvm.annotations.TRANSIENT_ANNOTATION_FQ_NAME
 import org.jetbrains.kotlin.resolve.lazy.descriptors.LazyAnnotationDescriptor
@@ -122,7 +123,7 @@ open class SerializationPluginDeclarationChecker : DeclarationChecker {
             return false
         }
 
-        if (descriptor.isInline) {
+        if (descriptor.isInlineClass()) {
             trace.reportOnSerializableAnnotation(descriptor, SerializationErrors.INLINE_CLASSES_NOT_SUPPORTED)
             return false
         }