[base] Make the SplicePiece instances case classes

Author: rayrobdod

Base/src/main/scala/typeclass/Repeat.scala

@@ -153,9 +153,9 @@ object Repeated extends VersionSpecificRepeated with LowPrioRepeated {
 	 * @version 0.1.1
 	 */
 	object SplicePiece {
-		final class Zero[Expr[+_]] extends SplicePiece[Expr, Nothing]
-		final class One[Expr[+_], +A](val elem: Expr[A]) extends SplicePiece[Expr, A]
-		final class Many[Expr[+_], +A](val iter: Expr[Iterable[A]]) extends SplicePiece[Expr, A]
+		final case class Zero[Expr[+_]]() extends SplicePiece[Expr, Nothing]
+		final case class One[Expr[+_], +A](val elem: Expr[A]) extends SplicePiece[Expr, A]
+		final case class Many[Expr[+_], +A](val iter: Expr[Iterable[A]]) extends SplicePiece[Expr, A]
 	}
 }