What is this "private[syntax]" language feature?
/** Wraps a value `self` and provides methods related to `Show` */
final class ShowOps[F] private[syntax](val self: F)(implicit val F: Show[F]) extends Ops[F] {
////
final def show: Cord = F.show(self)
final def shows: String = F.shows(self)
final def print: Unit = Console.print(shows)
final def println: Unit = Console.println(shows)
////
}
^ Location: scalaz-series-7.3.x/core/src/main/scala/scalaz/syntax/ShowSyntax.scala