KT-6877 Wrong unused function inspection on anonymous object member

#KT-6877 fixed

compiler/frontend/src/org/jetbrains/kotlin/psi/JetPsiUtil.java

@@ -805,9 +805,12 @@ public class JetPsiUtil {
                 return ((JetClassInitializer) current).getBody();
             }
             if (current instanceof JetProperty || current instanceof JetFunction) {
-                if (parent instanceof JetFile || (parent instanceof JetClassBody && !isMemberOfObjectExpression((JetCallableDeclaration) current))) {
+                if (parent instanceof JetFile) {
                     return (JetElement) current;
                 }
+                else if (parent instanceof JetClassBody && !isMemberOfObjectExpression((JetCallableDeclaration) current)) {
+                    return (JetElement) parent;
+                }
             }
             if (current instanceof JetBlockExpression || current instanceof JetParameter) {
                 return (JetElement) current;

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInClass.0.kt

@@ -0,0 +1,12 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages
+class Foo {
+    private val localObject = object : Any() {
+        fun <caret>f() {
+        }
+    }
+
+    fun bar() {
+        localObject.f()
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInClass.results.txt

@@ -0,0 +1 @@
+Function call (10: 21) localObject.f()

idea/testData/inspections/unusedSymbol/function/membersOfAnonymousInClass.kt

@@ -0,0 +1,43 @@
+class Klass {
+    private val localObject = object {
+        fun f() {
+        }
+
+        val p = 5
+    }
+
+    init {
+        localObject.f()
+        localObject.p
+    }
+
+
+    private fun localObject2() = object {
+        fun f() {
+        }
+
+        val p = 5
+    }
+
+    init {
+        localObject2().f()
+        localObject2().p
+    }
+
+
+    private val a = object {
+        val b = object {
+            val c = object {
+                val d = 5
+            }
+        }
+    }
+
+    init {
+        a.b.c.d
+    }
+}
+
+fun main(args: Array<String>) {
+    Klass()
+}

idea/tests/org/jetbrains/kotlin/findUsages/JetFindUsagesTestGenerated.java

@@ -648,6 +648,12 @@ public class JetFindUsagesTestGenerated extends AbstractJetFindUsagesTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("objectExpressionMemberInClass.0.kt")
+            public void testObjectExpressionMemberInClass() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInClass.0.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("synthesizedFunction.0.kt")
             public void testSynthesizedFunction() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/synthesizedFunction.0.kt");