Java 8 rules for method overrides:

- report errors on implementing methods of Any in interfaces
- update testData

~~~

Java 8 override restrictions: interface can't implement a method of 'Any'
- update compiler sources

compiler/backend-common/src/org/jetbrains/kotlin/backend/common/output/output.kt

@@ -33,8 +33,6 @@ public interface OutputFile {
     public val sourceFiles: List<File>
     public fun asByteArray(): ByteArray
     public fun asText(): String
-
-    override fun toString() = "$relativePath (compiled from $sourceFiles)"
 }
 
 public class SimpleOutputFile(
@@ -44,4 +42,6 @@ public class SimpleOutputFile(
 ) : OutputFile {
     override fun asByteArray(): ByteArray = content.toByteArray()
     override fun asText(): String = content
+
+    override fun toString() = "$relativePath (compiled from $sourceFiles)"
 }

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

@@ -217,6 +217,7 @@ public interface Errors {
             .create(WARNING, ABSTRACT_MODIFIER);
 
     DiagnosticFactory0<JetDeclaration> CONSTRUCTOR_IN_TRAIT = DiagnosticFactory0.create(ERROR, DECLARATION_SIGNATURE);
+    DiagnosticFactory0<JetDeclaration> METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE = DiagnosticFactory0.create(ERROR);
 
     DiagnosticFactory0<PsiElement> SUPERTYPE_INITIALIZED_IN_TRAIT = DiagnosticFactory0.create(ERROR);
 

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

@@ -439,6 +439,7 @@ public class DefaultErrorMessages {
         MAP.put(SUPERTYPE_INITIALIZED_IN_TRAIT, "Interfaces cannot initialize supertypes");
         MAP.put(CLASS_IN_SUPERTYPE_FOR_ENUM, "Enum class cannot inherit from classes");
         MAP.put(CONSTRUCTOR_IN_TRAIT, "An interface may not have a constructor");
+        MAP.put(METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE, "An interface may not implement a method of 'kotlin.Any'");
         MAP.put(TRAIT_WITH_SUPERCLASS, "An interface cannot inherit from a class");
         MAP.put(SUPERTYPE_APPEARS_TWICE, "A supertype appears twice");
         MAP.put(FINAL_SUPERTYPE, "This type is final, so it cannot be inherited from");

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

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.resolve;
 
+import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Multimap;
 import com.google.common.collect.Sets;
 import com.intellij.psi.PsiElement;
@@ -288,7 +289,8 @@ public class DeclarationsChecker {
         checkTypeParameterConstraints(aClass);
 
         if (aClass.isInterface()) {
-            checkConstructorInTrait(aClass);
+            checkConstructorInInterface(aClass);
+            checkMethodsOfAnyInInterface(classDescriptor);
             if (aClass.isLocal() && !(classDescriptor.getContainingDeclaration() instanceof ClassDescriptor)) {
                 trace.report(LOCAL_INTERFACE_NOT_ALLOWED.on(aClass, classDescriptor));
             }
@@ -367,13 +369,71 @@ public class DeclarationsChecker {
         return false;
     }
 
-    private void checkConstructorInTrait(JetClass klass) {
+    private void checkConstructorInInterface(JetClass klass) {
         JetPrimaryConstructor primaryConstructor = klass.getPrimaryConstructor();
         if (primaryConstructor != null) {
             trace.report(CONSTRUCTOR_IN_TRAIT.on(primaryConstructor));
         }
     }
 
+    private void checkMethodsOfAnyInInterface(ClassDescriptorWithResolutionScopes classDescriptor) {
+        for (CallableMemberDescriptor declaredCallableMember : classDescriptor.getDeclaredCallableMembers()) {
+            if (!(declaredCallableMember instanceof FunctionDescriptor)) continue;
+            FunctionDescriptor functionDescriptor = (FunctionDescriptor) declaredCallableMember;
+
+            PsiElement declaration = DescriptorToSourceUtils.descriptorToDeclaration(functionDescriptor);
+            if (!(declaration instanceof JetNamedFunction)) continue;
+            JetNamedFunction functionDeclaration = (JetNamedFunction) declaration;
+
+            if (isHidingParentMemberIfPresent(declaredCallableMember)) continue;
+
+            if (isImplementingMethodOfAny(declaredCallableMember)) {
+                trace.report(METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE.on(functionDeclaration));
+            }
+        }
+    }
+
+    private static final Set<String> METHOD_OF_ANY_NAMES = ImmutableSet.of("toString", "hashCode", "equals");
+
+    private static boolean isImplementingMethodOfAny(CallableMemberDescriptor member) {
+        if (!METHOD_OF_ANY_NAMES.contains(member.getName().asString())) return false;
+        if (member.getModality() == Modality.ABSTRACT) return false;
+
+        return isImplementingMethodOfAnyInternal(member, new HashSet<ClassDescriptor>());
+    }
+
+    private static boolean isImplementingMethodOfAnyInternal(CallableMemberDescriptor member, Set<ClassDescriptor> visitedClasses) {
+        for (CallableMemberDescriptor overridden : member.getOverriddenDescriptors()) {
+            DeclarationDescriptor containingDeclaration = overridden.getContainingDeclaration();
+            if (!(containingDeclaration instanceof ClassDescriptor)) continue;
+            ClassDescriptor containingClass = (ClassDescriptor) containingDeclaration;
+            if (visitedClasses.contains(containingClass)) continue;
+
+            if (DescriptorUtils.getFqName(containingClass).equals(KotlinBuiltIns.FQ_NAMES.any)) {
+                return true;
+            }
+
+            if (isHidingParentMemberIfPresent(overridden)) continue;
+
+            visitedClasses.add(containingClass);
+
+            if (isImplementingMethodOfAnyInternal(overridden, visitedClasses)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private static boolean isHidingParentMemberIfPresent(CallableMemberDescriptor member) {
+        JetNamedDeclaration declaration = (JetNamedDeclaration) DescriptorToSourceUtils.descriptorToDeclaration(member);
+        if (declaration != null) {
+            JetModifierList modifierList = declaration.getModifierList();
+            return modifierList == null || !modifierList.hasModifier(JetTokens.OVERRIDE_KEYWORD);
+        }
+        return false;
+    }
+
     private void checkAnnotationClassWithBody(JetClassOrObject classOrObject) {
         if (classOrObject.getBody() != null) {
             trace.report(ANNOTATION_CLASS_WITH_BODY.on(classOrObject.getBody()));

compiler/testData/codegen/box/classes/kt285.kt

@@ -1,12 +1,15 @@
 interface Trait {
     fun foo() = "O"
-    override fun toString() = "K"
+    fun bar(): String
 }
 
-class SimpleClass : Trait
+class SimpleClass : Trait {
+    override fun bar() = "K"
+}
 
+// Delegating 'toString' doesn't work, see KT-9519
 class ComplexClass : Trait by SimpleClass() {
-    override fun toString() = foo() + super.toString()
+    fun qux() = foo() + bar()
 }
 
-fun box() = ComplexClass().toString()
+fun box() = ComplexClass().qux()

compiler/testData/codegen/box/super/unqualifiedSuperWithMethodsOfAny.kt

@@ -8,10 +8,6 @@ interface IWithToString {
     override fun toString(): String
 }
 
-interface IWithDefaultToString {
-    override fun toString(): String = "I"
-}
-
 class C1 : ClassWithToString(), ISomething {
     override fun toString(): String = super.toString()
 }
@@ -20,15 +16,10 @@ class C2 : ClassWithToString(), IWithToString, ISomething  {
     override fun toString(): String = super.toString()
 }
 
-class C3 : IWithDefaultToString, ISomething  {
-    override fun toString(): String = super.toString()
-}
-
 fun box(): String {
     return when {
         C1().toString() != "C" -> "Failed #1"
         C2().toString() != "C" -> "Failed #2"
-        C3().toString() != "I" -> "Failed #3"
         else -> "OK"
     }
 }

compiler/testData/codegen/box/traits/kt5393_toString.kt

@@ -1,15 +0,0 @@
-interface A {
-    override fun toString(): String {
-        return "OK"
-    }
-}
-
-interface B : A
-
-class C : B {
-    override fun toString(): String {
-        return super.toString()
-    }
-}
-
-fun box() = "${C()}"

compiler/testData/codegen/boxInline/builders/builders.2.kt

@@ -3,8 +3,8 @@ package builders
 import java.util.ArrayList
 import java.util.HashMap
 
-interface Element {
-    fun render(builder: StringBuilder, indent: String)
+abstract class Element {
+    abstract fun render(builder: StringBuilder, indent: String)
 
     override fun toString(): String {
         val builder = StringBuilder()
@@ -13,13 +13,13 @@ interface Element {
     }
 }
 
-class TextElement(val text: String) : Element {
+class TextElement(val text: String) : Element() {
     override fun render(builder: StringBuilder, indent: String) {
         builder.append("$indent$text\n")
     }
 }
 
-abstract class Tag(val name: String) : Element {
+abstract class Tag(val name: String) : Element() {
     val children = ArrayList<Element>()
     val attributes = HashMap<String, String>()
 

compiler/testData/codegen/boxInline/builders/buildersAndLambdaCapturing.2.kt

@@ -3,8 +3,8 @@ package builders
 import java.util.ArrayList
 import java.util.HashMap
 
-interface Element {
-    fun render(builder: StringBuilder, indent: String)
+abstract class Element {
+    abstract fun render(builder: StringBuilder, indent: String)
 
     override fun toString(): String {
         val builder = StringBuilder()
@@ -13,13 +13,13 @@ interface Element {
     }
 }
 
-class TextElement(val text: String) : Element {
+class TextElement(val text: String) : Element() {
     override fun render(builder: StringBuilder, indent: String) {
         builder.append("$indent$text\n")
     }
 }
 
-abstract class Tag(val name: String) : Element {
+abstract class Tag(val name: String) : Element() {
     val children = ArrayList<Element>()
     val attributes = HashMap<String, String>()
 

compiler/testData/codegen/boxWithStdlib/dataClasses/tostring/alreadyInherited.kt

@@ -1,8 +1,8 @@
-interface SuperTrait {
+abstract class SuperTrait {
   override fun toString(): String = "!"
 }
 
-data class A(val x: Int): SuperTrait {
+data class A(val x: Int): SuperTrait() {
 }
 
 fun box(): String {

compiler/testData/diagnostics/tests/Builders.kt

@@ -49,8 +49,8 @@ fun main(args : Array<String>) {
   println(result)
 }
 
-interface Element {
-  fun render(builder : StringBuilder, indent : String)
+abstract class Element {
+  abstract fun render(builder : StringBuilder, indent : String)
 
   override fun toString() : String {
     val builder = StringBuilder()
@@ -59,13 +59,13 @@ interface Element {
   }
 }
 
-class TextElement(val text : String) : Element {
+class TextElement(val text : String) : Element() {
   override fun render(builder : StringBuilder, indent : String) {
     builder.append("$indent$text\n")
   }
 }
 
-abstract class Tag(val name : String) : Element {
+abstract class Tag(val name : String) : Element() {
   val children = ArrayList<Element>()
   val attributes = HashMap<String, String>()
 

compiler/testData/diagnostics/tests/Builders.txt

@@ -84,7 +84,8 @@ package html {
         public final override /*1*/ /*fake_override*/ fun kotlin.String.plus(): kotlin.Unit
     }
 
-    public interface Element {
+    public abstract class Element {
+        public constructor Element()
         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 abstract fun render(/*0*/ builder: java.lang.StringBuilder, /*1*/ indent: kotlin.String): kotlin.Unit

compiler/testData/diagnostics/tests/java8Overrides/hidingMethodOfAny.kt

@@ -0,0 +1,5 @@
+interface IA {
+    <!VIRTUAL_MEMBER_HIDDEN!>fun toString(): String<!> = "IB"
+
+    override fun equals(other: Any?): Boolean
+}

compiler/testData/diagnostics/tests/java8Overrides/hidingMethodOfAny.txt

@@ -0,0 +1,7 @@
+package
+
+public interface IA {
+    public abstract override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/java8Overrides/implementingMethodOfAny.kt

@@ -0,0 +1,9 @@
+interface IA {
+    <!METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE!>override fun toString(): String = "IA"<!>
+
+    <!METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE!>override fun equals(other: Any?): Boolean = <!SUPERCLASS_NOT_ACCESSIBLE_FROM_TRAIT!>super<!>.equals(other)<!>
+
+    <!METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE!>override fun hashCode(): Int {
+        return 42;
+    }<!>
+}

compiler/testData/diagnostics/tests/java8Overrides/implementingMethodOfAny.txt

@@ -0,0 +1,7 @@
+package
+
+public interface IA {
+    public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/java8Overrides/notAMethodOfAny.kt

@@ -0,0 +1,3 @@
+interface IC {
+    fun toString(x: String): String = "IC$x"
+}

compiler/testData/diagnostics/tests/java8Overrides/notAMethodOfAny.txt

@@ -0,0 +1,8 @@
+package
+
+public interface IC {
+    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 fun toString(/*0*/ x: kotlin.String): kotlin.String
+}

compiler/testData/diagnostics/tests/java8Overrides/overridingMethodOfAnyChain.kt

@@ -0,0 +1,13 @@
+interface IA
+
+interface IB : IA {
+    <!METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE!>override fun toString(): String = "IB"<!>
+}
+
+interface IC : IB {
+    <!METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE!>override fun toString(): String = "IC"<!>
+}
+
+interface ID : IC {
+    <!METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE!>override fun toString(): String = "ID"<!>
+}

compiler/testData/diagnostics/tests/java8Overrides/overridingMethodOfAnyChain.txt

@@ -1,19 +1,24 @@
 package
 
-public interface A {
-    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*/ fun toString(): kotlin.String
-}
-
-public interface B : A {
+public interface IA {
     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 C : B {
-    public constructor C()
+public interface IB : IA {
+    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*/ fun toString(): kotlin.String
+}
+
+public interface IC : IB {
+    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*/ fun toString(): kotlin.String
+}
+
+public interface ID : IC {
     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*/ fun toString(): kotlin.String

compiler/testData/diagnostics/tests/java8Overrides/overridingMethodOfAnyDiamond.kt

@@ -0,0 +1,11 @@
+interface ILeft {
+    override fun toString(): String
+}
+
+interface IRight {
+    override fun toString(): String
+}
+
+interface IDiamond : ILeft, IRight {
+    <!METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE!>override fun toString(): String = "IDiamond"<!>
+}

compiler/testData/diagnostics/tests/java8Overrides/overridingMethodOfAnyDiamond.txt

@@ -1,20 +1,19 @@
 package
 
-public final class C : IA, IB {
-    public constructor C()
+public interface IDiamond : ILeft, IRight {
     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*/ fun toString(): kotlin.String
 }
 
-public interface IA {
+public interface ILeft {
     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*/ fun toString(): kotlin.String
+    public abstract override /*1*/ fun toString(): kotlin.String
 }
 
-public interface IB {
+public interface IRight {
     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*/ fun toString(): kotlin.String
+    public abstract override /*1*/ fun toString(): kotlin.String
 }

compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/withAmbiguousMethodOfAny.kt

@@ -1,12 +0,0 @@
-interface IA {
-    override fun toString(): String = "IA"
-}
-
-interface IB {
-    override fun toString(): String = "IB"
-}
-
-class C : IA, IB {
-    override fun toString(): String =
-            <!AMBIGUOUS_SUPER!>super<!>.<!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>toString<!>()
-}

compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/withMethodOfAnyImplementedInSuperInterface.kt

@@ -1,12 +0,0 @@
-interface A {
-    override fun toString(): String {
-        return "OK"
-    }
-}
-
-interface B : A
-
-class C : B {
-    override fun toString(): String =
-            super.toString()
-}

compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/withMethodOfAnyOverridenInInterface.kt

@@ -5,12 +5,4 @@ interface IWithToString {
 class A : IWithToString {
     // Should be Any#toString(), even though IWithToString defines an abstract toString.
     override fun toString(): String = super.toString()
-}
-
-interface IWithImplementedToString {
-    override fun toString(): String = "Heh"
-}
-
-class B : IWithImplementedToString {
-    override fun toString(): String = super.toString()
-}
+}

compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/withMethodOfAnyOverridenInInterface.txt

@@ -7,19 +7,6 @@ public final class A : IWithToString {
     public open override /*1*/ fun toString(): kotlin.String
 }
 
-public final class B : IWithImplementedToString {
-    public constructor B()
-    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*/ fun toString(): kotlin.String
-}
-
-public interface IWithImplementedToString {
-    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*/ fun toString(): kotlin.String
-}
-
 public interface IWithToString {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/tests/org/jetbrains/kotlin/checkers/JetDiagnosticsTestGenerated.java

@@ -9184,57 +9184,66 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
             }
         }
 
-        @TestMetadata("compiler/testData/diagnostics/tests/jdk-annotations")
+        @TestMetadata("compiler/testData/diagnostics/tests/java8Overrides")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)
-        public static class Jdk_annotations extends AbstractJetDiagnosticsTest {
-            public void testAllFilesPresentInJdk_annotations() throws Exception {
-                JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/diagnostics/tests/jdk-annotations"), Pattern.compile("^(.+)\\.kt$"), true);
-            }
-
-            @TestMetadata("ArrayListAndMap.kt")
-            public void testArrayListAndMap() throws Exception {
-                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/jdk-annotations/ArrayListAndMap.kt");
+        public static class Java8Overrides extends AbstractJetDiagnosticsTest {
+            @TestMetadata("abstractBaseClassMemberNotImplemented.kt")
+            public void testAbstractBaseClassMemberNotImplemented() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/abstractBaseClassMemberNotImplemented.kt");
                 doTest(fileName);
             }
 
-            @TestMetadata("ArrayListClone.kt")
-            public void testArrayListClone() throws Exception {
-                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/jdk-annotations/ArrayListClone.kt");
+            @TestMetadata("abstractVsAbstract.kt")
+            public void testAbstractVsAbstract() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/abstractVsAbstract.kt");
                 doTest(fileName);
             }
 
-            @TestMetadata("ArrayListToArray.kt")
-            public void testArrayListToArray() throws Exception {
-                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/jdk-annotations/ArrayListToArray.kt");
+            public void testAllFilesPresentInJava8Overrides() throws Exception {
+                JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/diagnostics/tests/java8Overrides"), Pattern.compile("^(.+)\\.kt$"), true);
+            }
+
+            @TestMetadata("defaultVsAbstract.kt")
+            public void testDefaultVsAbstract() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/defaultVsAbstract.kt");
                 doTest(fileName);
             }
 
-            @TestMetadata("compiler/testData/diagnostics/tests/jdk-annotations/sql")
-            @TestDataPath("$PROJECT_ROOT")
-            @RunWith(JUnit3RunnerWithInners.class)
-            public static class Sql extends AbstractJetDiagnosticsTest {
-                public void testAllFilesPresentInSql() throws Exception {
-                    JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/diagnostics/tests/jdk-annotations/sql"), Pattern.compile("^(.+)\\.kt$"), true);
-                }
+            @TestMetadata("hidingMethodOfAny.kt")
+            public void testHidingMethodOfAny() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/hidingMethodOfAny.kt");
+                doTest(fileName);
+            }
 
-                @TestMetadata("DriverManager.kt")
-                public void testDriverManager() throws Exception {
-                    String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/jdk-annotations/sql/DriverManager.kt");
-                    doTest(fileName);
-                }
+            @TestMetadata("implementingMethodOfAny.kt")
+            public void testImplementingMethodOfAny() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/implementingMethodOfAny.kt");
+                doTest(fileName);
+            }
 
-                @TestMetadata("ResultSet.kt")
-                public void testResultSet() throws Exception {
-                    String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/jdk-annotations/sql/ResultSet.kt");
-                    doTest(fileName);
-                }
+            @TestMetadata("notAMethodOfAny.kt")
+            public void testNotAMethodOfAny() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/notAMethodOfAny.kt");
+                doTest(fileName);
+            }
 
-                @TestMetadata("Statement.kt")
-                public void testStatement() throws Exception {
-                    String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/jdk-annotations/sql/Statement.kt");
-                    doTest(fileName);
-                }
+            @TestMetadata("overridingMethodOfAnyChain.kt")
+            public void testOverridingMethodOfAnyChain() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/overridingMethodOfAnyChain.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("overridingMethodOfAnyDiamond.kt")
+            public void testOverridingMethodOfAnyDiamond() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/overridingMethodOfAnyDiamond.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("singleRelevantDefault.kt")
+            public void testSingleRelevantDefault() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/java8Overrides/singleRelevantDefault.kt");
+                doTest(fileName);
             }
         }
 
@@ -15668,18 +15677,6 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                     doTest(fileName);
                 }
 
-                @TestMetadata("withAmbiguousMethodOfAny.kt")
-                public void testWithAmbiguousMethodOfAny() throws Exception {
-                    String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/withAmbiguousMethodOfAny.kt");
-                    doTest(fileName);
-                }
-
-                @TestMetadata("withMethodOfAnyImplementedInSuperInterface.kt")
-                public void testWithMethodOfAnyImplementedInSuperInterface() throws Exception {
-                    String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/withMethodOfAnyImplementedInSuperInterface.kt");
-                    doTest(fileName);
-                }
-
                 @TestMetadata("withMethodOfAnyOverridenInInterface.kt")
                 public void testWithMethodOfAnyOverridenInInterface() throws Exception {
                     String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/withMethodOfAnyOverridenInInterface.kt");

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -7540,12 +7540,6 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
-        @TestMetadata("kt5393_toString.kt")
-        public void testKt5393_toString() throws Exception {
-            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/traits/kt5393_toString.kt");
-            doTest(fileName);
-        }
-
         @TestMetadata("multiple.kt")
         public void testMultiple() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/traits/multiple.kt");

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/descriptors/SamConstructorDescriptor.kt

@@ -33,7 +33,7 @@ public class SamConstructorDescriptor(
         samInterface.getSource()
 )
 
-public object SamConstructorDescriptorKindExclude : DescriptorKindExclude {
+public object SamConstructorDescriptorKindExclude : DescriptorKindExclude() {
     override fun excludes(descriptor: DeclarationDescriptor) = descriptor is SamConstructorDescriptor
 
     override val fullyExcludedDescriptorKinds: Int get() = 0

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/JetScope.kt

@@ -211,21 +211,21 @@ public class DescriptorKindFilter(
     }
 }
 
-public interface DescriptorKindExclude {
-    public fun excludes(descriptor: DeclarationDescriptor): Boolean
+public abstract class DescriptorKindExclude {
+    public abstract fun excludes(descriptor: DeclarationDescriptor): Boolean
 
-    public val fullyExcludedDescriptorKinds: Int
+    public abstract val fullyExcludedDescriptorKinds: Int
 
     override fun toString() = this.javaClass.getSimpleName()
 
-    public object Extensions : DescriptorKindExclude {
+    public object Extensions : DescriptorKindExclude() {
         override fun excludes(descriptor: DeclarationDescriptor)
                 = descriptor is CallableDescriptor && descriptor.getExtensionReceiverParameter() != null
 
         override val fullyExcludedDescriptorKinds: Int get() = 0
     }
 
-    public object NonExtensions : DescriptorKindExclude {
+    public object NonExtensions : DescriptorKindExclude() {
         override fun excludes(descriptor: DeclarationDescriptor)
                 = descriptor !is CallableDescriptor || descriptor.getExtensionReceiverParameter() == null
 
@@ -233,14 +233,14 @@ public interface DescriptorKindExclude {
             get() = DescriptorKindFilter.ALL_KINDS_MASK and (DescriptorKindFilter.FUNCTIONS_MASK or DescriptorKindFilter.VARIABLES_MASK).inv()
     }
 
-    public object EnumEntry : DescriptorKindExclude {
+    public object EnumEntry : DescriptorKindExclude() {
         override fun excludes(descriptor: DeclarationDescriptor)
                 = descriptor is ClassDescriptor && descriptor.getKind() == ClassKind.ENUM_ENTRY
 
         override val fullyExcludedDescriptorKinds: Int get() = 0
     }
 
-    public object TopLevelPackages : DescriptorKindExclude {
+    public object TopLevelPackages : DescriptorKindExclude() {
         override fun excludes(descriptor: DeclarationDescriptor): Boolean {
             val fqName = when (descriptor) {
                 is PackageFragmentDescriptor -> descriptor.fqName

idea/ide-common/src/org/jetbrains/kotlin/idea/util/CallType.kt

@@ -56,7 +56,7 @@ public sealed class CallType<TReceiver : JetElement?>(val descriptorKindFilter:
 
     object TYPE : CallType<JetExpression?>(DescriptorKindFilter(DescriptorKindFilter.CLASSIFIERS_MASK or DescriptorKindFilter.PACKAGES_MASK))
 
-    private object NonInfixExclude : DescriptorKindExclude {
+    private object NonInfixExclude : DescriptorKindExclude() {
         //TODO: check 'infix' modifier
         override fun excludes(descriptor: DeclarationDescriptor) =
                 !(descriptor is SimpleFunctionDescriptor && descriptor.valueParameters.size() == 1)
@@ -65,7 +65,7 @@ public sealed class CallType<TReceiver : JetElement?>(val descriptorKindFilter:
             get() = 0
     }
 
-    private object NonOperatorExclude : DescriptorKindExclude {
+    private object NonOperatorExclude : DescriptorKindExclude() {
         override fun excludes(descriptor: DeclarationDescriptor) =
                 !(descriptor is SimpleFunctionDescriptor && descriptor.isOperator)
 
@@ -73,7 +73,7 @@ public sealed class CallType<TReceiver : JetElement?>(val descriptorKindFilter:
             get() = 0
     }
 
-    private object CallableReferenceExclude : DescriptorKindExclude {
+    private object CallableReferenceExclude : DescriptorKindExclude() {
         override fun excludes(descriptor: DeclarationDescriptor) /* currently not supported for locals, synthetic and genetic */
                 = descriptor !is CallableMemberDescriptor || descriptor.kind == CallableMemberDescriptor.Kind.SYNTHESIZED || descriptor.typeParameters.isNotEmpty()
 

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/BasicCompletionSession.kt

@@ -397,7 +397,7 @@ class BasicCompletionSession(configuration: CompletionSessionConfiguration,
     }
 
     private companion object {
-        object NonAnnotationClassifierExclude : DescriptorKindExclude {
+        object NonAnnotationClassifierExclude : DescriptorKindExclude() {
             override fun excludes(descriptor: DeclarationDescriptor): Boolean {
                 if (descriptor !is ClassifierDescriptor) return false
                 return descriptor !is ClassDescriptor || descriptor.getKind() != ClassKind.ANNOTATION_CLASS

js/js.translator/src/org/jetbrains/kotlin/js/translate/callTranslator/CallInfo.kt

@@ -40,7 +40,9 @@ interface CallInfo {
     val extensionReceiver: JsExpression?
 
     fun constructSafeCallIsNeeded(result: JsExpression): JsExpression
+}
 
+abstract class AbstractCallInfo : CallInfo {
     override fun toString(): String {
         val location = DiagnosticUtils.atLocation(callableDescriptor)
         val name = callableDescriptor.getName().asString()
@@ -49,9 +51,9 @@ interface CallInfo {
 }
 
 // if value == null, it is get access
-class VariableAccessInfo(callInfo: CallInfo, val value: JsExpression? = null) : CallInfo by callInfo
+class VariableAccessInfo(callInfo: CallInfo, val value: JsExpression? = null) : AbstractCallInfo(), CallInfo by callInfo
 
-class FunctionCallInfo(callInfo: CallInfo, val argumentsInfo: CallArgumentTranslator.ArgumentsInfo) : CallInfo by callInfo
+class FunctionCallInfo(callInfo: CallInfo, val argumentsInfo: CallArgumentTranslator.ArgumentsInfo) : AbstractCallInfo(), CallInfo by callInfo
 
 /**
  * no receivers - extensionOrDispatchReceiver = null,     extensionReceiver = null
@@ -146,7 +148,7 @@ private fun TranslationContext.createCallInfo(resolvedCall: ResolvedCall<out Cal
             }
         }
     }
-    return object : CallInfo {
+    return object : AbstractCallInfo(), CallInfo {
         override val context: TranslationContext = this@createCallInfo
         override val resolvedCall: ResolvedCall<out CallableDescriptor> = resolvedCall
         override val dispatchReceiver: JsExpression? = dispatchReceiver

js/js.translator/testData/inlineMultiFile/cases/builders/builders.2.kt

@@ -8,8 +8,8 @@ package foo
 import java.util.ArrayList
 import java.util.HashMap
 
-interface Element {
-    fun render(builder: StringBuilder, indent: String)
+abstract class Element {
+    abstract fun render(builder: StringBuilder, indent: String)
 
     override fun toString(): String {
         val builder = StringBuilder()
@@ -18,13 +18,13 @@ interface Element {
     }
 }
 
-class TextElement(val text: String) : Element {
+class TextElement(val text: String) : Element() {
     override fun render(builder: StringBuilder, indent: String) {
         builder.append("$indent$text\n")
     }
 }
 
-abstract class Tag(val name: String) : Element {
+abstract class Tag(val name: String) : Element() {
     val children = ArrayList<Element>()
     val attributes = HashMap<String, String>()
 

js/js.translator/testData/inlineMultiFile/cases/buildersAndLambdaCapturing/buildersAndLambdaCapturing.2.kt

@@ -8,8 +8,8 @@ package foo
 import java.util.ArrayList
 import java.util.HashMap
 
-interface Element {
-    fun render(builder: StringBuilder, indent: String)
+abstract class Element {
+    abstract fun render(builder: StringBuilder, indent: String)
 
     override fun toString(): String {
         val builder = StringBuilder()
@@ -18,13 +18,13 @@ interface Element {
     }
 }
 
-class TextElement(val text: String) : Element {
+class TextElement(val text: String) : Element() {
     override fun render(builder: StringBuilder, indent: String) {
         builder.append("$indent$text\n")
     }
 }
 
-abstract class Tag(val name: String) : Element {
+abstract class Tag(val name: String) : Element() {
     val children = ArrayList<Element>()
     val attributes = HashMap<String, String>()
 

js/js.translator/testData/webDemoExamples2/cases/builder.kt

@@ -45,8 +45,8 @@ fun main(args: Array<String>) {
     println(result)
 }
 
-interface Element {
-    fun render(builder: StringBuilder, indent: String)
+abstract class Element {
+    abstract fun render(builder: StringBuilder, indent: String)
 
     override fun toString(): String {
         val builder = StringBuilder()
@@ -55,13 +55,13 @@ interface Element {
     }
 }
 
-class TextElement(val text: String) : Element {
+class TextElement(val text: String) : Element() {
     override fun render(builder: StringBuilder, indent: String) {
         builder.append("$indent$text\n")
     }
 }
 
-abstract class Tag(val name: String) : Element {
+abstract class Tag(val name: String) : Element() {
     val children = ArrayList<Element>()
     val attributes = HashMap<String, String>()