[FE] Prohibit inheritance of sealed classes in different module

KT-20423

compiler/tests/org/jetbrains/kotlin/jvm/compiler/CompileKotlinAgainstCustomBinariesTest.kt

@@ -700,6 +700,12 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
         compileKotlin("main.kt", tmpdir, listOf(library), additionalOptions = features)
     }
 
+    fun testSealedInheritorInDifferentModule() {
+        val features = listOf("-XXLanguage:+FreedomForSealedClasses", "-XXLanguage:+SealedInterfaces")
+        val library = compileLibrary("library", additionalOptions = features, checkKotlinOutput = {})
+        compileKotlin("main.kt", tmpdir, listOf(library), additionalOptions = features)
+    }
+
     // If this test fails, then bootstrap compiler most likely should be advanced
     fun testPreReleaseFlagIsConsistentBetweenBootstrapAndCurrentCompiler() {
         val bootstrapCompiler = JarFile(PathUtil.kotlinPathsForCompiler.compilerPath)