[Serialization] Reorganize module structure

plugins/kotlinx-serialization/testData/diagnostics/NonSerializable.kt

@@ -0,0 +1,17 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER,-UNUSED_VARIABLE
+// WITH_STDLIB
+// FILE: test.kt
+import kotlinx.serialization.*
+
+class NonSerializable
+
+@Serializable
+class Basic(val foo: <!SERIALIZER_NOT_FOUND("NonSerializable")!>NonSerializable<!>)
+
+@Serializable
+class Inside(val foo: List<<!SERIALIZER_NOT_FOUND("NonSerializable")!>NonSerializable<!>>)
+
+@Serializable
+class WithImplicitType {
+    <!SERIALIZER_NOT_FOUND("NonSerializable")!>val foo = NonSerializable()<!>
+}