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diff --git a/guide/example/example-builtin-13.kt b/guide/example/example-builtin-13.kt
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+++ b/guide/example/example-builtin-13.kt
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+// This file was automatically generated from builtin-classes.md by Knit tool. Do not edit.
+package example.exampleBuiltin13
+
+import kotlinx.serialization.*
+import kotlinx.serialization.json.*
+
+@Serializable
+sealed class ParametrizedParent<out R> {
+    @Serializable
+    data class ChildWithoutParameter(val value: Int) : ParametrizedParent<Nothing>()
+}
+
+fun main() {
+    println(Json.encodeToString(ParametrizedParent.ChildWithoutParameter(42)))
+}