From be4e2f96c2ff49635df6424f8dab4d27a8476b5e Mon Sep 17 00:00:00 2001
From: Alexey Andreev <Alexey.Andreev@jetbrains.com>
Date: Fri, 24 Nov 2017 12:24:16 +0300
Subject: [PATCH] JS: throw error from coroutine marker functions

---
 js/js.libraries/src/js/markerFunctions.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/js/js.libraries/src/js/markerFunctions.js b/js/js.libraries/src/js/markerFunctions.js
index 15c2fc30754..ff2bb808a73 100644
--- a/js/js.libraries/src/js/markerFunctions.js
+++ b/js/js.libraries/src/js/markerFunctions.js
@@ -67,17 +67,28 @@ Kotlin.suspendCall = function(value) {
 };
 
 Kotlin.coroutineResult = function(qualifier) {
+    throwMarkerError();
 };
 
 Kotlin.coroutineController = function(qualifier) {
+    throwMarkerError();
 };
 
 Kotlin.coroutineReceiver = function(qualifier) {
+    throwMarkerError();
 };
 
 Kotlin.setCoroutineResult = function(value, qualifier) {
+    throwMarkerError();
 };
 
+function throwMarkerError() {
+    throw new Error(
+        "This marker function should never been called. " +
+        "Looks like compiler did not eliminate it properly. " +
+        "Please, report an issue if you caught this exception.");
+}
+
 Kotlin.getFunctionById = function(id, defaultValue) {
     return function() {
         return defaultValue;