gistfile1.scala

object BugFixProject {

  def main (args: Array[String]) {
    val repoWithEntities = Seq(
      (ARepo, Seq(A("", ""), A("", ""))),
      (BRepo, Seq(B("", ""), B("", "")))
    )

    printall(repoWithEntities)
  }

  def printall[Entity](pairs: Seq[(BaseRepo[Entity], Seq[Entity])]) : Seq[String] = {
    pairs.map { t =>
      val repo = t._1
      val entities = t._2

      entities.map(repo.toString(_))
    }.flatten
  }

}

case class A(foo: String, bar: String){}
case class B(foo: String, bar: String){}

trait BaseRepo[X] {
  def toString(x: X) : String = x.toString
}

object BRepo extends BaseRepo[B] {}
object ARepo extends BaseRepo[A] {}