JS: serialize type of local anonymous class as its denotable supertype. See KT-14888

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

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.resolve.constants.NullValue
 import org.jetbrains.kotlin.types.KotlinType
 
 open class KotlinSerializerExtensionBase(private val protocol: SerializerExtensionProtocol) : SerializerExtension() {
-    override final val stringTable = StringTableImpl()
+    override val stringTable = StringTableImpl()
 
     override fun serializeClass(descriptor: ClassDescriptor, proto: ProtoBuf.Class.Builder) {
         for (annotation in descriptor.annotations) {

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

@@ -26,7 +26,7 @@ import org.jetbrains.kotlin.types.ErrorUtils
 import org.jetbrains.kotlin.utils.Interner
 import java.io.OutputStream
 
-class StringTableImpl : StringTable {
+open class StringTableImpl : StringTable {
     private class FqNameProto(val fqName: QualifiedName.Builder) {
         override fun hashCode(): Int {
             var result = 13
@@ -72,7 +72,7 @@ class StringTableImpl : StringTable {
             is ClassDescriptor -> {
                 builder.parentQualifiedName = getFqNameIndex(containingDeclaration)
             }
-            else -> throw IllegalStateException("Cannot get FQ name of local class: " + descriptor)
+            else -> return getFqNameIndexOfLocalAnonymousClass(descriptor)
         }
 
         builder.shortName = getStringIndex(descriptor.name.asString())
@@ -80,6 +80,10 @@ class StringTableImpl : StringTable {
         return qualifiedNames.intern(FqNameProto(builder))
     }
 
+    open fun getFqNameIndexOfLocalAnonymousClass(descriptor: ClassifierDescriptorWithTypeParameters): Int {
+        throw IllegalStateException("Cannot get FQ name of local class: " + descriptor)
+    }
+
     fun getPackageFqNameIndex(fqName: FqName): Int {
         var result = -1
         for (segment in fqName.pathSegments()) {

compiler/testData/diagnostics/testsWithJsStdLib/localClassMetadata.kt

@@ -0,0 +1,51 @@
+// MODULE: lib
+// FILE: lib.kt
+
+interface I {
+    fun foo(): String
+}
+
+abstract class A {
+    abstract fun bar(): String
+}
+
+abstract class G<T> {
+    abstract fun baz(): T
+}
+
+class C {
+    private val propA = object : A() {
+        override fun bar() = "propA.bar"
+
+        fun x() = "OK"
+    }
+
+    private val propI = object : I {
+        override fun foo() = "propI.foo"
+
+        fun x() = "OK"
+    }
+
+    private val propAI = object : A(), I {
+        override fun foo() = "propAI.foo"
+
+        override fun bar() = "propAI.bar"
+
+        fun x() = "OK"
+    }
+
+    private val propG = object : G<String>() {
+        override fun baz() = "propG.baz"
+
+        fun x() = "OK"
+    }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+fun test() {
+    println(C().<!INVISIBLE_MEMBER!>propA<!>.x())
+    println(C().<!INVISIBLE_MEMBER!>propI<!>.x())
+    println(C().<!INVISIBLE_MEMBER!>propAI<!>.x())
+    println(C().<!INVISIBLE_MEMBER!>propG<!>.x())
+}

compiler/testData/diagnostics/testsWithJsStdLib/localClassMetadata.txt

@@ -0,0 +1,42 @@
+// -- Module: <lib> --
+package
+
+public abstract class A {
+    public constructor A()
+    public abstract fun bar(): 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
+}
+
+public final class C {
+    public constructor C()
+    private final val propA: C.propA.<no name provided>
+    private final val propAI: C.propAI.<no name provided>
+    private final val propG: C.propG.<no name provided>
+    private final val propI: C.propI.<no name provided>
+    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 class G</*0*/ T> {
+    public constructor G</*0*/ T>()
+    public abstract fun baz(): T
+    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 I {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+
+// -- Module: <main> --
+package
+
+public fun test(): kotlin.Unit

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

@@ -36,6 +36,12 @@ public class DiagnosticsTestWithJsStdLibGenerated extends AbstractDiagnosticsTes
         KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/diagnostics/testsWithJsStdLib"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.ANY, true);
     }
 
+    @TestMetadata("localClassMetadata.kt")
+    public void testLocalClassMetadata() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithJsStdLib/localClassMetadata.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("runtimeAnnotations.kt")
     public void testRuntimeAnnotations() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithJsStdLib/runtimeAnnotations.kt");