[NI] Fix exception explicit qualified receiver and dispatch receiver

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/model/KotlinCall.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
+ * Copyright 2010-2017 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.resolve.calls.model
 
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
 
 interface KotlinCall : ResolutionAtom {
@@ -25,7 +26,7 @@ interface KotlinCall : ResolutionAtom {
     val explicitReceiver: ReceiverKotlinCallArgument?
 
     // a.(foo)() -- (foo) is dispatchReceiverForInvoke
-    val dispatchReceiverForInvokeExtension: SimpleKotlinCallArgument? get() = null
+    val dispatchReceiverForInvokeExtension: ReceiverKotlinCallArgument? get() = null
 
     val name: Name
 
@@ -62,8 +63,8 @@ fun KotlinCall.checkCallInvariants() {
         "Lambda argument or callable reference is not allowed as explicit receiver: $explicitReceiver"
     }
 
-    (explicitReceiver as? SimpleKotlinCallArgument)?.checkReceiverInvariants()
-    dispatchReceiverForInvokeExtension?.checkReceiverInvariants()
+    explicitReceiver.safeAs<SimpleKotlinCallArgument>()?.checkReceiverInvariants()
+    dispatchReceiverForInvokeExtension.safeAs<SimpleKotlinCallArgument>()?.checkReceiverInvariants()
     argumentsInParenthesis.forEach(KotlinCallArgument::checkArgumentInvariants)
     externalArgument?.checkArgumentInvariants()
 

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/model/KotlinCallArguments.kt

@@ -28,9 +28,13 @@ import org.jetbrains.kotlin.types.UnwrappedType
 
 interface ReceiverKotlinCallArgument : KotlinCallArgument {
     val receiver: DetailedReceiver
+    val isSafeCall: Boolean
 }
 
 class QualifierReceiverKotlinCallArgument(override val receiver: QualifierReceiver) : ReceiverKotlinCallArgument {
+    override val isSafeCall: Boolean
+        get() = false // TODO: add warning
+
     override fun toString() = "$receiver"
 
     override val isSpread get() = false
@@ -46,8 +50,6 @@ interface PostponableKotlinCallArgument : KotlinCallArgument, ResolutionAtom
 
 interface SimpleKotlinCallArgument : KotlinCallArgument, ReceiverKotlinCallArgument {
     override val receiver: ReceiverValueWithSmartCastInfo
-
-    val isSafeCall: Boolean
 }
 
 interface ExpressionKotlinCallArgument : SimpleKotlinCallArgument, ResolutionAtom