FIR: Do not mark not found classes' based types from Java as error

The same happens in FE1.0

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -22388,6 +22388,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/javaInterop/lambdaInstanceOf.kt");
         }
 
+        @Test
+        @TestMetadata("notFoundClasses.kt")
+        public void testNotFoundClasses() throws Exception {
+            runTest("compiler/testData/codegen/box/javaInterop/notFoundClasses.kt");
+        }
+
         @Test
         @TestMetadata("protectedField.kt")
         public void testProtectedField() throws Exception {

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/JavaUtils.kt

@@ -12,8 +12,13 @@ import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.fir.*
 import org.jetbrains.kotlin.fir.builder.FirAnnotationContainerBuilder
 import org.jetbrains.kotlin.fir.builder.FirBuilderDsl
-import org.jetbrains.kotlin.fir.declarations.*
+import org.jetbrains.kotlin.fir.declarations.FirConstructor
-import org.jetbrains.kotlin.fir.diagnostics.*
+import org.jetbrains.kotlin.fir.declarations.FirRegularClass
+import org.jetbrains.kotlin.fir.declarations.FirTypeParameter
+import org.jetbrains.kotlin.fir.declarations.FirValueParameter
+import org.jetbrains.kotlin.fir.diagnostics.ConeIntermediateDiagnostic
+import org.jetbrains.kotlin.fir.diagnostics.ConeSimpleDiagnostic
+import org.jetbrains.kotlin.fir.diagnostics.DiagnosticKind
 import org.jetbrains.kotlin.fir.expressions.*
 import org.jetbrains.kotlin.fir.expressions.builder.*
 import org.jetbrains.kotlin.fir.java.declarations.FirJavaClass
@@ -456,6 +461,12 @@ private fun JavaClassifierType.toConeKotlinTypeForFlexibleBound(
             val symbol = javaTypeParameterStack[classifier]
             ConeTypeParameterTypeImpl(symbol.toLookupTag(), isNullable = !isLowerBound)
         }
+        null -> {
+            val classId = ClassId.topLevel(FqName(this.classifierQualifiedName))
+            ConeClassLikeLookupTagImpl(classId).constructClassType(
+                emptyArray(), isNullable = !isLowerBound, attributes,
+            )
+        }
         else -> ConeKotlinErrorType(ConeSimpleDiagnostic("Unexpected classifier: $classifier", DiagnosticKind.Java))
     }
 }

compiler/testData/codegen/box/javaInterop/notFoundClasses.kt

@@ -0,0 +1,42 @@
+// TARGET_BACKEND: JVM
+
+// MODULE: old
+// FILE: test2/Row.java
+
+package test2;
+
+public interface Row {
+    String res();
+}
+
+// MODULE: new(old)
+
+// FILE: test1/Row.java
+package test1;
+
+public interface Row {
+    String res();
+}
+
+// FILE: JavaClass.java
+
+public class JavaClass {
+    public static test1.Row foo() {
+        return new test1.Row() {
+            @Override
+            public String res() {
+                return "OK";
+            }
+        };
+    }
+
+    public static String bar(test1.Row y) { return y.res(); }
+    public static String bar(test2.Row y) { return y.res(); }
+}
+
+// MODULE: main(new)
+// FILE: main.kt
+fun box(): String {
+    val r = JavaClass.foo()
+    return JavaClass.bar(r)
+}

compiler/testData/diagnostics/testsWithStdLib/inference/recursiveFlexibleAssertions.fir.kt

@@ -75,5 +75,5 @@ fun test() {
     }
     // TODO: FIR
     // {AbstractAssert<*, out Any!>! & EnumerableAssert<*, {Comparable<*> & java.io.Serializable!}>!} with unfolded flexible nullability
-    <!DEBUG_INFO_EXPRESSION_TYPE("AbstractAssert<*, out ERROR CLASS: CST(ERROR CLASS: Unexpected classifier: null, kotlin/String..ERROR CLASS: CST(ERROR CLASS: Unexpected classifier: null, kotlin/String?!> & EnumerableAssert<*, out kotlin.Comparable<kotlin.String & kotlin.Char> & java.io.Serializable..kotlin.Comparable<kotlin.String & kotlin.Char>? & java.io.Serializable?>..AbstractAssert<*, out ERROR CLASS: CST(ERROR CLASS: Unexpected classifier: null, kotlin/String..ERROR CLASS: CST(ERROR CLASS: Unexpected classifier: null, kotlin/String?!>? & EnumerableAssert<*, out kotlin.Comparable<kotlin.String & kotlin.Char> & java.io.Serializable..kotlin.Comparable<kotlin.String & kotlin.Char>? & java.io.Serializable?>?")!>assertion<!>
+    <!DEBUG_INFO_EXPRESSION_TYPE("AbstractAssert<*, out kotlin.Any..kotlin.Any?!> & EnumerableAssert<*, out kotlin.Comparable<kotlin.String & kotlin.Char> & java.io.Serializable..kotlin.Comparable<kotlin.String & kotlin.Char>? & java.io.Serializable?>..AbstractAssert<*, out kotlin.Any..kotlin.Any?!>? & EnumerableAssert<*, out kotlin.Comparable<kotlin.String & kotlin.Char> & java.io.Serializable..kotlin.Comparable<kotlin.String & kotlin.Char>? & java.io.Serializable?>?")!>assertion<!>
 }

compiler/testData/diagnostics/testsWithStdLib/java/functionN.fir.kt

@@ -47,7 +47,7 @@ fun main() {
     a.baz(listOf())
 
     a.manyParams(null)
-    a.manyParams(any<kotlin.jvm.functions.FunctionN<Unit>>())
+    a.<!NONE_APPLICABLE!>manyParams<!>(any<kotlin.jvm.functions.FunctionN<Unit>>())
 
     // Potentially, this would have better to forbid calling manyParams, too.
     // But it might be complicated because we need to match that it is an override

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java

@@ -22346,6 +22346,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/javaInterop/lambdaInstanceOf.kt");
         }
 
+        @Test
+        @TestMetadata("notFoundClasses.kt")
+        public void testNotFoundClasses() throws Exception {
+            runTest("compiler/testData/codegen/box/javaInterop/notFoundClasses.kt");
+        }
+
         @Test
         @TestMetadata("protectedField.kt")
         public void testProtectedField() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -22388,6 +22388,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/javaInterop/lambdaInstanceOf.kt");
         }
 
+        @Test
+        @TestMetadata("notFoundClasses.kt")
+        public void testNotFoundClasses() throws Exception {
+            runTest("compiler/testData/codegen/box/javaInterop/notFoundClasses.kt");
+        }
+
         @Test
         @TestMetadata("protectedField.kt")
         public void testProtectedField() throws Exception {

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -18718,6 +18718,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/javaInterop/lambdaInstanceOf.kt");
         }
 
+        @TestMetadata("notFoundClasses.kt")
+        public void testNotFoundClasses() throws Exception {
+            runTest("compiler/testData/codegen/box/javaInterop/notFoundClasses.kt");
+        }
+
         @TestMetadata("protectedField.kt")
         public void testProtectedField() throws Exception {
             runTest("compiler/testData/codegen/box/javaInterop/protectedField.kt");