Corrected return-type of EventLoop pseudo ctor

* Also preserve binary compatibility
See PR #477

Author: Groostav

binary-compatibility-validator/reference-public-api/kotlinx-coroutines-core.txt

@@ -281,19 +281,28 @@ public abstract interface class kotlinx/coroutines/experimental/DisposableHandle
 	public abstract fun dispose ()V
 }
 
-public abstract interface class kotlinx/coroutines/experimental/EventLoop {
+public abstract interface class kotlinx/coroutines/experimental/EventLoop : kotlin/coroutines/experimental/ContinuationInterceptor {
 	public static final field Factory Lkotlinx/coroutines/experimental/EventLoop$Factory;
 	public abstract fun processNextEvent ()J
 }
 
+public final class kotlinx/coroutines/experimental/EventLoop$DefaultImpls {
+	public static fun fold (Lkotlinx/coroutines/experimental/EventLoop;Ljava/lang/Object;Lkotlin/jvm/functions/Function2;)Ljava/lang/Object;
+	public static fun get (Lkotlinx/coroutines/experimental/EventLoop;Lkotlin/coroutines/experimental/CoroutineContext$Key;)Lkotlin/coroutines/experimental/CoroutineContext$Element;
+	public static fun minusKey (Lkotlinx/coroutines/experimental/EventLoop;Lkotlin/coroutines/experimental/CoroutineContext$Key;)Lkotlin/coroutines/experimental/CoroutineContext;
+	public static fun plus (Lkotlinx/coroutines/experimental/EventLoop;Lkotlin/coroutines/experimental/CoroutineContext;)Lkotlin/coroutines/experimental/CoroutineContext;
+}
+
 public final class kotlinx/coroutines/experimental/EventLoop$Factory {
 	public final synthetic fun invoke (Ljava/lang/Thread;Lkotlinx/coroutines/experimental/Job;)Lkotlinx/coroutines/experimental/CoroutineDispatcher;
 	public static synthetic fun invoke$default (Lkotlinx/coroutines/experimental/EventLoop$Factory;Ljava/lang/Thread;Lkotlinx/coroutines/experimental/Job;ILjava/lang/Object;)Lkotlinx/coroutines/experimental/CoroutineDispatcher;
 }
 
 public final class kotlinx/coroutines/experimental/EventLoopKt {
-	public static final fun EventLoop (Ljava/lang/Thread;Lkotlinx/coroutines/experimental/Job;)Lkotlinx/coroutines/experimental/CoroutineDispatcher;
+	public static final synthetic fun EventLoop (Ljava/lang/Thread;Lkotlinx/coroutines/experimental/Job;)Lkotlinx/coroutines/experimental/CoroutineDispatcher;
+	public static final fun EventLoop (Ljava/lang/Thread;Lkotlinx/coroutines/experimental/Job;)Lkotlinx/coroutines/experimental/EventLoop;
 	public static synthetic fun EventLoop$default (Ljava/lang/Thread;Lkotlinx/coroutines/experimental/Job;ILjava/lang/Object;)Lkotlinx/coroutines/experimental/CoroutineDispatcher;
+	public static synthetic fun EventLoop$default (Ljava/lang/Thread;Lkotlinx/coroutines/experimental/Job;ILjava/lang/Object;)Lkotlinx/coroutines/experimental/EventLoop;
 }
 
 public abstract class kotlinx/coroutines/experimental/ExecutorCoroutineDispatcherBase : kotlinx/coroutines/experimental/CloseableCoroutineDispatcher, kotlinx/coroutines/experimental/Delay {

core/kotlinx-coroutines-core/src/EventLoop.kt

@@ -17,7 +17,7 @@ import kotlin.coroutines.experimental.*
  * It may optionally implement [Delay] interface and support time-scheduled tasks. It is used by [runBlocking] to
  * continue processing events when invoked from the event dispatch thread.
  */
-public interface EventLoop {
+public interface EventLoop: ContinuationInterceptor {
     /**
      * Processes next event in this event loop.
      *
@@ -54,11 +54,19 @@ public interface EventLoop {
  * ```
  */
 @Suppress("FunctionName")
-public fun EventLoop(thread: Thread = Thread.currentThread(), parentJob: Job? = null): CoroutineDispatcher =
+public fun EventLoop(thread: Thread = Thread.currentThread(), parentJob: Job? = null): EventLoop =
     EventLoopImpl(thread).apply {
         if (parentJob != null) initParentJob(parentJob)
     }
 
+/**
+ * @suppress **Deprecated**: Preserves binary compatibility with old code
+ */
+@JvmName("EventLoop")
+@Deprecated(level = DeprecationLevel.HIDDEN, message = "Preserves binary compatibility with old code")
+public fun EventLoop_Deprecated(thread: Thread = Thread.currentThread(), parentJob: Job? = null): CoroutineDispatcher =
+    EventLoop(thread, parentJob) as CoroutineDispatcher
+
 private const val DELAYED = 0
 private const val REMOVED = 1
 private const val RESCHEDULED = 2