Use cancellation exception from standard library in Kotlin/JS and K/N (…

…Kotlin#2638)


* On JVM it uses java.util.concurrent.CancellationException, same as stdlib declaration
* Fully backwards compatible for JVM, Native-friendly for Obj-C interop

kotlinx-coroutines-core/common/test/flow/internal/FlowScopeTest.kt

@@ -68,10 +68,10 @@ class FlowScopeTest : TestBase() {
             flowScope {
                 flowScope {
                     launch {
-                       throw CancellationException(null)
+                       throw CancellationException("")
                     }
                 }
             }
         }
     }
-}
+}

kotlinx-coroutines-core/js/src/Exceptions.kt

@@ -10,12 +10,7 @@ package kotlinx.coroutines
  * **It is not printed to console/log by default uncaught exception handler**.
  * (see [CoroutineExceptionHandler]).
  */
-public actual open class CancellationException(
-    message: String?,
-    cause: Throwable?
-) : IllegalStateException(message, cause) {
-    public actual constructor(message: String?) : this(message, null)
-}
+public actual typealias CancellationException = kotlin.coroutines.cancellation.CancellationException
 
 /**
  * Thrown by cancellable suspending functions if the [Job] of the coroutine is cancelled or completed

kotlinx-coroutines-core/native/src/Exceptions.kt

@@ -10,12 +10,7 @@ package kotlinx.coroutines
  * **It is not printed to console/log by default uncaught exception handler**.
  * (see [CoroutineExceptionHandler]).
  */
-public actual open class CancellationException(
-    message: String?,
-    cause: Throwable?
-) : IllegalStateException(message, cause) {
-    public actual constructor(message: String?) : this(message, null)
-}
+public actual typealias CancellationException = kotlin.coroutines.cancellation.CancellationException
 
 /**
  * Thrown by cancellable suspending functions if the [Job] of the coroutine is cancelled or completed