From 050a1e782e40e79a9b101f3f0e997d22b09aa1ef Mon Sep 17 00:00:00 2001
From: Alexey Andreev <Alexey.Andreev@jetbrains.com>
Date: Mon, 7 Nov 2016 18:26:25 +0300
Subject: [PATCH] JS: fix translation of call to suspend function with optional
 parameters

---
 .../js/translate/reference/CallArgumentTranslator.kt       | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/js/js.translator/src/org/jetbrains/kotlin/js/translate/reference/CallArgumentTranslator.kt b/js/js.translator/src/org/jetbrains/kotlin/js/translate/reference/CallArgumentTranslator.kt
index fce1bc7ac81..277a3f3bb1e 100644
--- a/js/js.translator/src/org/jetbrains/kotlin/js/translate/reference/CallArgumentTranslator.kt
+++ b/js/js.translator/src/org/jetbrains/kotlin/js/translate/reference/CallArgumentTranslator.kt
@@ -21,6 +21,7 @@ import com.google.dart.compiler.backend.js.ast.metadata.SideEffectKind
 import com.google.dart.compiler.backend.js.ast.metadata.sideEffects
 import com.intellij.util.SmartList
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
 import org.jetbrains.kotlin.js.translate.context.Namer
@@ -157,7 +158,11 @@ class CallArgumentTranslator private constructor(
             }
         }
 
-        removeLastUndefinedArguments(result)
+        val callableDescriptor = resolvedCall.resultingDescriptor
+        if (callableDescriptor !is FunctionDescriptor || !callableDescriptor.isSuspend) {
+            removeLastUndefinedArguments(result)
+        }
+
         return ArgumentsInfo(result, hasSpreadOperator, cachedReceiver)
     }