AbstractPartialFunction.

Contributed by Todd Vierling with minor mods by extempore. This is an
obvious extension of AbstractFunctionN which I had some issue making
work at the time. Sounds kind of pitiful given that the compiler patch
is about two lines, but let's all agree to believe it was a different
world then.

This example program is impacted as follows:

    class A {
      def f: PartialFunction[Any, Int] = { case x: String => 1 }
      def g: PartialFunction[Any, Int] = f orElse { case x: List[_] => 2 }
      def h: PartialFunction[Any, Int] = g orElse { case x: Set[_] => 3 }
    }

Before: 34943 bytes of bytecode
 After:  4217 bytes of bytecode

A mere 88% reduction in size. "'Tis but a trifle!" Closes SI-5096,
SI-5097.

3 files changed, 3 insertions, 4 deletions

diff --git a/src/actors/scala/actors/Actor.scala b/src/actors/scala/actors/Actor.scala
index ba4d90f0b3..b2cd69e914 100644
--- a/src/actors/scala/actors/Actor.scala
+++ b/src/actors/scala/actors/Actor.scala
@@ -246,7 +246,7 @@ object Actor extends Combinators {
     rawSelf.react(new RecursiveProxyHandler(rawSelf, f))
 
   private class RecursiveProxyHandler(a: ReplyReactor, f: PartialFunction[Any, Unit])
-          extends PartialFunction[Any, Unit] {
+          extends scala.runtime.AbstractPartialFunction[Any, Unit] {
     def isDefinedAt(m: Any): Boolean =
       true // events are immediately removed from the mailbox
     def apply(m: Any) {
diff --git a/src/actors/scala/actors/Future.scala b/src/actors/scala/actors/Future.scala
index 735c13190b..4de73507fb 100644
--- a/src/actors/scala/actors/Future.scala
+++ b/src/actors/scala/actors/Future.scala
@@ -200,7 +200,7 @@ object Futures {
     Actor.timer.schedule(timerTask, timeout)
 
     def awaitWith(partFuns: Seq[PartialFunction[Any, Pair[Int, Any]]]) {
-      val reaction: PartialFunction[Any, Unit] = new PartialFunction[Any, Unit] {
+      val reaction: PartialFunction[Any, Unit] = new scala.runtime.AbstractPartialFunction[Any, Unit] {
         def isDefinedAt(msg: Any) = msg match {
           case TIMEOUT => true
           case _ => partFuns exists (_ isDefinedAt msg)
diff --git a/src/actors/scala/actors/Reactor.scala b/src/actors/scala/actors/Reactor.scala
index 507c18d04e..8f0492f149 100644
--- a/src/actors/scala/actors/Reactor.scala
+++ b/src/actors/scala/actors/Reactor.scala
@@ -38,11 +38,10 @@ private[actors] object Reactor {
     }
   }
 
-  val waitingForNone = new PartialFunction[Any, Unit] {
+  val waitingForNone: PartialFunction[Any, Unit] = new scala.runtime.AbstractPartialFunction[Any, Unit] {
     def isDefinedAt(x: Any) = false
     def apply(x: Any) {}
   }
-
 }
 
 /**