Use the same message in intrinsified serializer() and reflective serializer()

Author: sandwwraith

core/commonMain/src/kotlinx/serialization/Serializers.kt

@@ -283,13 +283,8 @@ private fun <T : Any> KSerializer<T>.nullable(shouldBeNullable: Boolean): KSeria
  */
 @Suppress("unused")
 @PublishedApi
-internal fun noCompiledSerializer(forClass: String): KSerializer<*> {
-    throw SerializationException(
-        "Cannot find serializer for class $forClass.\n" +
-                "Make sure that this class marked with @Serializable annotation," +
-                "or provide serializer explicitly, or use proper SerializersModule"
-    )
-}
+internal fun noCompiledSerializer(forClass: String): KSerializer<*> =
+    throw SerializationException(notRegisteredMessage(forClass))
 
 // Used when compiler intrinsic is inserted
 @OptIn(ExperimentalSerializationApi::class)

core/commonMain/src/kotlinx/serialization/internal/Platform.common.kt

@@ -92,8 +92,10 @@ internal fun KClass<*>.serializerNotRegistered(): Nothing {
     throw SerializationException(notRegisteredMessage())
 }
 
-internal fun KClass<*>.notRegisteredMessage(): String = "Serializer for class '${simpleName}' is not found.\n" +
-        "Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied."
+internal fun KClass<*>.notRegisteredMessage(): String = notRegisteredMessage(simpleName ?: "<local class name not available>")
+
+internal fun notRegisteredMessage(className: String): String = "Serializer for class '$className' is not found.\n" +
+        "Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied.\n"
 
 internal expect fun KClass<*>.platformSpecificSerializerNotRegistered(): Nothing