Refactor Optional instances

Author: japgolly

core/src/main/scala/japgolly/scalajs/react/vdom/Optional.scala

@@ -8,12 +8,12 @@ trait Optional[T[_]] {
 }
 
 object Optional {
-  implicit object OptionalOption extends Optional[Option] {
+  implicit val optionInstance: Optional[Option] = new Optional[Option] {
     @inline final override def foreach[A](t: Option[A])(f: (A) => Unit): Unit = t foreach f
     @inline final override def fold[A, B](t: Option[A], f: A => B, b: => B): B = t.fold(b)(f)
   }
 
-  implicit object OptionalJsUndefOr extends Optional[UndefOr] {
+  implicit val jsUndefOrInstance: Optional[UndefOr] = new Optional[UndefOr] {
     @inline final override def foreach[A](t: UndefOr[A])(f: (A) => Unit): Unit = t foreach f
     @inline final override def fold[A, B](t: UndefOr[A], f: A => B, b: => B): B = t.fold(b)(f)
   }

scalaz-7.1/src/main/scala/japgolly/scalajs/react/ScalazReact.scala

@@ -11,7 +11,7 @@ import Leibniz.===
 
 object ScalazReact {
 
-  implicit object OptionalMaybe extends Optional[Maybe] {
+  implicit val maybeInstance: Optional[Maybe] = new Optional[Maybe] {
     @inline final override def foreach[A](m: Maybe[A])(f: (A) => Unit): Unit = m.cata(f, ())
     @inline final override def fold[A, B](t: Maybe[A], f: A => B, b: => B): B = t.cata(f, b)
   }

sync-scala70

@@ -11,7 +11,7 @@ perl -pe '
   s/{Optional => _, _}/_/;
   ' < $s1/$f > $s0/$f
 sed -i "
-  /OptionalMaybe/,/^ *} *$/d;
+  /Optional\[Maybe/,/^ *} *$/d;
   /^object/a\  // Don't edit this directly. Run $(basename "$0")
 " $s0/$f