Sum two case class in scala3

SumTwoCaseClass.scala

@experimental
object Test extends App :
  val a = CCA("a", 2, 3.0)
  val b = CCB(4.5, 128.toByte)
  val res = sum[CCA, CCB, CCC](a, b)
  println(res)

@experimental
def sum[A <: Product, B <: Product, C <: Product](a: A, b: B)
 (using ma: Mirror.ProductOf[A],
  mb: Mirror.ProductOf[B],
  mc: Mirror.ProductOf[C],
  ev: Concat[ma.MirroredElemTypes, mb.MirroredElemTypes] =:= mc.MirroredElemTypes): C =
  val concatted = Tuple.fromProductTyped(a) ++ Tuple.fromProductTyped(b)
  mc.fromTuple(ev(concatted))


case class CCA(a: String, b: Int, c: Double)

case class CCB(d: Float, e: Byte)

case class CCC(a: String, b: Int, c: Double, d: Float, e: Byte)

Result:

/Users/<...>/.sdkman/candidates/java/22.1.0.r17-grl/bin/java ...
CCC(a,2,3.0,4.5,-128)

Process finished with exit code 0