Added test for implicit receiver in class.

idea/testData/inspections/unusedReceiverParameter/implicitReceiverInClass.kt

@@ -0,0 +1,12 @@
+class A {
+    fun simple() {
+    }
+
+    fun Any.ext() {
+        simple()
+    }
+
+    fun Any.ext1() {
+        ext1()
+    }
+}

idea/testData/inspections/unusedReceiverParameter/inspectionData/expected.xml

@@ -31,4 +31,12 @@
         <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused receiver parameter</problem_class>
         <description>Receiver parameter is never used</description>
     </problem>
+    <problem>
+        <file>implicitReceiverInClass.kt</file>
+        <line>5</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/irrelevantCallInFunction.kt" />
+        <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused receiver parameter</problem_class>
+        <description>Receiver parameter is never used</description>
+    </problem>
 </problems>