Processing implicit extension receiver usages in outflow processing

idea/src/org/jetbrains/kotlin/idea/slicer/OutflowSlicer.kt

@@ -153,16 +153,32 @@ class OutflowSlicer(
 
     private fun processExtensionReceiver(declaration: KtCallableDeclaration, declarationWithBody: KtDeclarationWithBody) {
         //TODO: overriders
-        //TODO: implicit receivers
         val resolutionFacade = declaration.getResolutionFacade()
         val callableDescriptor = declaration.resolveToDescriptorIfAny(resolutionFacade) as? CallableDescriptor ?: return
         val extensionReceiver = callableDescriptor.extensionReceiverParameter ?: return
-        declarationWithBody.bodyExpression?.forEachDescendantOfType<KtThisExpression> { thisExpression ->
+        val body = declarationWithBody.bodyExpression ?: return
+
+        body.forEachDescendantOfType<KtThisExpression> { thisExpression ->
             val receiverDescriptor = thisExpression.resolveToCall(resolutionFacade)?.resultingDescriptor
             if (receiverDescriptor == extensionReceiver) {
                 thisExpression.passToProcessor()
             }
         }
+
+        // process implicit receiver usages
+        val pseudocode = pseudocodeCache[body]
+        if (pseudocode != null) {
+            for (instruction in pseudocode.instructions) {
+                if (instruction is MagicInstruction && instruction.kind == MagicKind.IMPLICIT_RECEIVER) {
+                    val receiverPseudoValue = instruction.outputValue
+                    pseudocode.getUsages(receiverPseudoValue).forEach { receiverUseInstruction ->
+                        if (receiverUseInstruction is KtElementInstruction) {
+                            processIfReceiverValue(receiverUseInstruction, receiverPseudoValue)
+                        }
+                    }
+                }
+            }
+        }
     }
 
     private fun processExpression(expression: KtExpression) {

idea/testData/slicer/outflow/implicitReceiver.kt

@@ -0,0 +1,13 @@
+// FLOW: OUT
+
+fun Any.extensionFun(): Any {
+    return this
+}
+
+fun String.foo() {
+    val v = extensionFun()
+}
+
+fun main() {
+    <caret>"A".foo()
+}

idea/testData/slicer/outflow/implicitReceiver.results.txt

@@ -0,0 +1,7 @@
+12 <bold>"A"</bold>.foo()
+7 	fun <bold>String</bold>.foo() {
+3 		fun <bold>Any</bold>.extensionFun(): Any {
+4 			return <bold>this</bold>
+3 				fun Any.<bold>extensionFun(): Any {</bold>
+8 					val v = <bold>extensionFun()</bold>
+8 						val <bold>v = extensionFun()</bold>