[Serialization] Reorganize module structure

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

@@ -0,0 +1,29 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER,-UNUSED_VARIABLE
+// WITH_STDLIB
+// SKIP_TXT
+import kotlinx.serialization.*
+
+
+@Serializable
+enum class ImplicitlyDuplicated {
+    @SerialName("foo")
+    FIRST,
+    <!DUPLICATE_SERIAL_NAME_ENUM!>@SerialName("foo")<!>
+    SECOND
+}
+
+@Serializable
+enum class ExplicitlyDuplicated {
+    FIRST,
+    SECOND,
+    <!DUPLICATE_SERIAL_NAME_ENUM!>@SerialName("FIRST")<!>
+    THIRD
+}
+
+@Serializable
+enum class ReversedExplicitlyDuplicated {
+    <!DUPLICATE_SERIAL_NAME_ENUM!>@SerialName("THIRD")<!>
+    FIRST,
+    SECOND,
+    THIRD
+}