Parcelize: Resolve parcel serializers on demand

plugins/android-extensions/android-extensions-compiler/testData/parcel/box/customParcelable.kt

@@ -0,0 +1,37 @@
+// IGNORE_BACKEND: JVM
+// See KT-38105
+// Throws IllegalAccessError, since the code tries to access the private companion field directly from the generated User$Creator class.
+// WITH_RUNTIME
+
+@file:JvmName("TestKt")
+package test
+
+import kotlinx.android.parcel.*
+import android.os.Parcel
+import android.os.Parcelable
+
+data class User(val name: String, val age: Int)
+
+@Parcelize
+data class UserParcelable(val user: User) : Parcelable {
+    private companion object : Parceler<UserParcelable> {
+        override fun UserParcelable.write(parcel: Parcel, flags: Int) {
+            parcel.writeString(user.name)
+        }
+
+        override fun create(parcel: Parcel) = UserParcelable(User(parcel.readString(), 0))
+    }
+}
+
+fun box() = parcelTest { parcel ->
+    val userParcelable = UserParcelable(User("John", 20))
+    userParcelable.writeToParcel(parcel, 0)
+
+    val bytes = parcel.marshall()
+    parcel.unmarshall(bytes, 0, bytes.size)
+
+    val userParcelable2 = readFromParcel<UserParcelable>(parcel)
+
+    assert(userParcelable.user.name == userParcelable2.user.name)
+    assert(userParcelable2.user.age == 0)
+}