Chimney Coproduct Case

TransformationTest.scala

import io.scalaland.chimney.dsl._
import org.scalatest.funsuite.AnyFunSuite
import org.scalatest.matchers.should.Matchers

class TransformationTest extends AnyFunSuite with Matchers {

  sealed trait A extends Product with Serializable
  object A {
    case class Foo(s: String) extends A
    case class Bar(kvs: Map[String, Int]) extends A
  }

  sealed trait B extends Product with Serializable // same structure as A
  object B {
    case class Foo(s: String) extends B
    case class Bar(kvs: Map[String, Int]) extends B
  }

  sealed trait C extends Product with Serializable
  object C {
    case class Foo(s: String) extends C
    case class Bar(keys: Seq[String], values: Seq[Int]) extends C
  }

  case class Bag[T](xs: Seq[T])

  test("transforming a coproduct with identical structure") {
    val as = Seq(A.Foo("foo"), A.Bar(Map("bar" -> 1)))
    val transformed = as.transformInto[Seq[B]]
    succeed
  }

}

Internal error: unable to find the outer accessor symbol of class TransformationTest
[error]     val transformed = as.transformInto[Seq[B]]