import scala.compiletime.deferred

trait MyCodec[E]

object auto {
  trait CompanionEssentials[E] {
    given MyCodec[E] = deferred
  }
}

import auto.CompanionEssentials

case class Person(name: String, age: Int)
object Person extends CompanionEssentials[Person]
// deferred given implemented as:
// override final lazy given val given_MyCodec_E: MyCodec[Person] =
//   Person.given_MyCodec_E

object auto {
  trait CompanionEssentials[E] {
    given MyCodec[E] = deferred
  }

  given [E] => MyCodec[E] = new MyCodec[E]{}
}

import auto.{CompanionEssentials, given}

case class Person(name: String, age: Int)
object Person extends CompanionEssentials[Person]
// deferred given implemented as:
// override final lazy given val given_MyCodec_E: MyCodec[Person] =
//   auto.given_MyCodec_E[Person]