Promote Publisher<T>.collect to stable API

Author: qwwdfsad

reactive/kotlinx-coroutines-reactive/src/Channel.kt

@@ -36,7 +36,6 @@ public suspend inline fun <T> Publisher<T>.consumeEach(action: (T) -> Unit) =
  * Subscribes to this [Publisher] and performs the specified action for each received element.
  * Cancels subscription if any exception happens during collect.
  */
-@ExperimentalCoroutinesApi // Since 1.2.1, tentatively till 1.3.0
 public suspend inline fun <T> Publisher<T>.collect(action: (T) -> Unit) =
     openSubscription().consumeEach(action)
 

reactive/kotlinx-coroutines-reactive/src/Publish.kt

@@ -48,7 +48,7 @@ public fun <T> publish(
 
 @Deprecated(
     message = "CoroutineScope.publish is deprecated in favour of top-level publish",
-    level = DeprecationLevel.WARNING,
+    level = DeprecationLevel.ERROR,
     replaceWith = ReplaceWith("publish(context, block)")
 ) // Since 1.3.0, will be error in 1.3.1 and hidden in 1.4.0. Binary compatibility with Spring
 @LowPriorityInOverloadResolution