KT-7381 Receiver parameter is never used for native extension function

#KT-7381 fixed

idea/src/org/jetbrains/kotlin/idea/inspections/UnusedReceiverParameterInspection.kt

@@ -38,7 +38,9 @@ public class UnusedReceiverParameterInspection : AbstractKotlinInspection() {
                 val receiverTypeReference = callableDeclaration.getReceiverTypeReference()
                 if (receiverTypeReference == null) return
                 if (callableDeclaration.isOverridable() || callableDeclaration.hasModifier(JetTokens.OVERRIDE_KEYWORD)) return
-                if (callableDeclaration is JetProperty && callableDeclaration.hasDelegateExpression()) return
+
+                if (callableDeclaration is JetProperty && callableDeclaration.getAccessors().isEmpty()) return
+                if (callableDeclaration is JetNamedFunction && !callableDeclaration.hasBody()) return
 
                 val callable = callableDeclaration.descriptor
 

idea/testData/inspections/unusedReceiverParameter/noBody.kt

@@ -0,0 +1,3 @@
+val Any.extProp: String
+
+fun Any.extFun()