KT-7472 function of anonymous class is never used

#KT-7472 fixed

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

@@ -793,6 +793,14 @@ public class JetPsiUtil {
         return getEnclosingElementForLocalDeclaration(declaration, true);
     }
 
+    private static boolean isMemberOfObjectExpression(@NotNull JetCallableDeclaration propertyOrFunction) {
+        PsiElement parent = PsiTreeUtil.getStubOrPsiParent(propertyOrFunction);
+        if (!(parent instanceof JetClassBody)) return false;
+        PsiElement grandparent = PsiTreeUtil.getStubOrPsiParent(parent);
+        if (!(grandparent instanceof JetObjectDeclaration)) return false;
+        return PsiTreeUtil.getStubOrPsiParent(grandparent) instanceof JetObjectLiteralExpression;
+    }
+
     @Nullable
     public static JetElement getEnclosingElementForLocalDeclaration(@NotNull JetDeclaration declaration, boolean skipParameters) {
         if (declaration instanceof JetTypeParameter && skipParameters) {
@@ -819,10 +827,12 @@ public class JetPsiUtil {
             if (current instanceof JetClassInitializer) {
                 return ((JetClassInitializer) current).getBody();
             }
-            if (current instanceof JetBlockExpression ||
+            if (current instanceof JetProperty || current instanceof JetFunction) {
-                current instanceof JetProperty ||
+                if (parent instanceof JetFile || (parent instanceof JetClassBody && !isMemberOfObjectExpression((JetCallableDeclaration) current))) {
-                current instanceof JetParameter ||
+                    return (JetElement) current;
-                current instanceof JetFunction) {
+                }
+            }
+            if (current instanceof JetBlockExpression || current instanceof JetParameter) {
                 return (JetElement) current;
             }
 

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

@@ -0,0 +1,12 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages
+package anonymousUnused
+
+fun main(args: Array<String>) {
+    class LocalClass {
+        fun <caret>f() {
+        }
+    }
+
+    LocalClass().f()
+}

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

@@ -0,0 +1 @@
+Function call (11: 18) LocalClass().f()

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

@@ -0,0 +1,15 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetProperty
+// OPTIONS: usages
+package anonymousUnused
+
+fun main(args: Array<String>) {
+    val a = object {
+        val b = object {
+            val c = object {
+                val <caret>d = 5
+            }
+        }
+    }
+
+    a.b.c.d
+}

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

@@ -0,0 +1 @@
+Value read (14: 11) a.b.c.d

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

@@ -0,0 +1,12 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages
+package anonymousUnused
+
+fun main(args: Array<String>) {
+    val localObject = object : Any() {
+        fun <caret>f() {
+        }
+    }
+
+    localObject.f()
+}

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

@@ -0,0 +1 @@
+Function call (11: 17) localObject.f()

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMember2.0.kt

@@ -0,0 +1,12 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages
+package anonymousUnused
+
+fun main(args: Array<String>) {
+    fun localObject() = object : Any() {
+        fun <caret>f() {
+        }
+    }
+
+    localObject().f()
+}

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMember2.results.txt

@@ -0,0 +1 @@
+Function call (11: 19) localObject().f()

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

@@ -0,0 +1,45 @@
+fun main(args: Array<String>) {
+    val localObject = object {
+        fun f() {
+        }
+
+        val p = 5
+    }
+
+    localObject.f()
+    localObject.p
+
+
+    fun localObject2() = object {
+        fun f() {
+        }
+
+        val p = 5
+    }
+
+    localObject2().f()
+    localObject2().p
+
+
+    val a = object {
+        val b = object {
+            val c = object {
+                val d = 5
+            }
+        }
+    }
+
+    a.b.c.d
+
+
+    class LocalClass {
+        fun f() {
+        }
+
+        val p = 5
+    }
+
+
+    LocalClass().f()
+    LocalClass().p
+}

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

@@ -618,6 +618,30 @@ public class JetFindUsagesTestGenerated extends AbstractJetFindUsagesTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("localClassMember.0.kt")
+            public void testLocalClassMember() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/localClassMember.0.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("objectExpressionDeepMember.0.kt")
+            public void testObjectExpressionDeepMember() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionDeepMember.0.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("objectExpressionMember.0.kt")
+            public void testObjectExpressionMember() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMember.0.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("objectExpressionMember2.0.kt")
+            public void testObjectExpressionMember2() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMember2.0.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("synthesizedFunction.0.kt")
             public void testSynthesizedFunction() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/synthesizedFunction.0.kt");