Adding a warning for adapted args and fixed the issues associated with it

akka-actor/src/main/scala/akka/actor/IO.scala

@@ -663,8 +663,8 @@ object IO {
         if (left > more.length)
           (Cont(step(left - more.length)), Chunk.empty)
         else
-          (Done(), Chunk(more drop left))
-      case eof @ EOF(None)  ⇒ (Done(), eof)
+          (Done(()), Chunk(more drop left))
+      case eof @ EOF(None)  ⇒ (Done(()), eof)
       case eof @ EOF(cause) ⇒ (Cont(step(left), cause), eof)
     }
 

akka-actor/src/main/scala/akka/japi/JavaAPI.scala

@@ -96,7 +96,7 @@ abstract class PurePartialFunction[A, B] extends scala.runtime.AbstractFunction1
   def apply(x: A, isCheck: Boolean): B
 
   final def isDefinedAt(x: A): Boolean = try { apply(x, true); true } catch { case NoMatch ⇒ false }
-  final def apply(x: A): B = try apply(x, false) catch { case NoMatch ⇒ throw new MatchError }
+  final def apply(x: A): B = try apply(x, false) catch { case NoMatch ⇒ throw new MatchError(x) }
 }
 
 /**

akka-actor/src/main/scala/akka/util/SubclassifiedIndex.scala

@@ -30,7 +30,7 @@ object SubclassifiedIndex {
       val kids = subkeys flatMap (_ addValue value)
       if (!(values contains value)) {
         values += value
-        kids :+ (key, values)
+        kids :+ ((key, values))
       } else kids
     }
 
@@ -43,7 +43,7 @@ object SubclassifiedIndex {
       val kids = subkeys flatMap (_ removeValue value)
       if (values contains value) {
         values -= value
-        kids :+ (key, values)
+        kids :+ ((key, values))
       } else kids
     }
 
@@ -104,7 +104,7 @@ class SubclassifiedIndex[K, V] private (private var values: Set[V])(implicit sc:
       val v = values + value
       val n = new Nonroot(key, v)
       integrate(n)
-      n.addValue(key, value) :+ (key, v)
+      n.addValue(key, value) :+ ((key, v))
     } else ch
   }
 

akka-camel/src/test/scala/akka/camel/TestSupport.scala

@@ -36,7 +36,7 @@ private[camel] object TestSupport {
         camel.template.asyncRequestBody(to, msg).get(timeout.toNanos, TimeUnit.NANOSECONDS)
       } catch {
         case e: ExecutionException ⇒ throw e.getCause
-        case e: TimeoutException   ⇒ throw new AssertionError("Failed to get response to message [%s], send to endpoint [%s], within [%s]" format (msg, to, timeout), e)
+        case e: TimeoutException   ⇒ throw new AssertionError("Failed to get response to message [%s], send to endpoint [%s], within [%s]".format(msg, to, timeout))
       }
     }
 

project/AkkaBuild.scala

@@ -403,7 +403,7 @@ object AkkaBuild extends Build {
     resolvers += "Typesafe Repo" at "http://repo.typesafe.com/typesafe/releases/",
 
     // compile options
-    scalacOptions ++= Seq("-encoding", "UTF-8", "-target:jvm-1.6", "-deprecation", "-feature", "-unchecked", "-Xlog-reflective-calls") ++ (
+    scalacOptions ++= Seq("-encoding", "UTF-8", "-target:jvm-1.6", "-deprecation", "-feature", "-unchecked", "-Xlog-reflective-calls", "-Ywarn-adapted-args") ++ (
       if (true || (System getProperty "java.runtime.version" startsWith "1.7")) Seq() else Seq("-optimize")), // -optimize fails with jdk7
     javacOptions  ++= Seq("-Xlint:unchecked", "-Xlint:deprecation"),