Supported default objects in unused symbol inspection.

idea/testData/inspections/unusedSymbol/object/defaultObject.kt

@@ -1,23 +0,0 @@
-package defaultObject
-
-class A {
-    default object {
-    }
-}
-
-class B {
-    default object NamedUnused {
-    }
-}
-
-class C {
-    default object NamedUsed {
-    }
-}
-
-fun main(args: Array<String>) {
-    A()
-    B()
-    C()
-    C.NamedUsed
-}

idea/testData/inspections/unusedSymbol/object/defaultObjectUnused.kt

@@ -0,0 +1,14 @@
+class A {
+    default object {
+    }
+}
+
+class B {
+    default object Named {
+    }
+}
+
+fun main(args: Array<String>) {
+    A()
+    B()
+}

idea/testData/inspections/unusedSymbol/object/defaultObjectUsed.kt

@@ -0,0 +1,14 @@
+class A {
+    default object {
+    }
+}
+
+class B {
+    default object Named {
+    }
+}
+
+fun main(args: Array<String>) {
+    val a = A
+    B.Named
+}

idea/testData/inspections/unusedSymbol/object/defaultObjectUsedInJava.java

@@ -0,0 +1,9 @@
+import defaultObjectUsedInJava.*
+
+class JavaUsage {
+    public static void main(String[] args) {
+        System.out.println(A.CONST + C.CONST);
+        B.foo();
+        D.foo();
+    }
+}

idea/testData/inspections/unusedSymbol/object/defaultObjectUsedInJava.kt

@@ -0,0 +1,29 @@
+package defaultObjectUsedInJava
+
+import kotlin.platform.platformStatic
+
+class A {
+    default object {
+        val CONST = 42
+    }
+}
+
+class B {
+    default object {
+        platformStatic fun foo() {
+        }
+    }
+}
+
+class C {
+    default object Named {
+        val CONST = 42
+    }
+}
+
+class D {
+    default object Named {
+        platformStatic fun foo() {
+        }
+    }
+}

idea/testData/inspections/unusedSymbol/object/inspectionData/expected.xml

@@ -31,4 +31,22 @@
     <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
     <description>Object 'A' is never used</description>
   </problem>
+
+  <problem>
+    <file>defaultObjectUnused.kt</file>
+    <line>2</line>
+    <module>light_idea_test_case</module>
+    <entry_point TYPE="file" FQNAME="temp:///src/defaultObjectUnused.kt" />
+    <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
+    <description>Object 'Default' is never used</description>
+  </problem>
+
+  <problem>
+    <file>defaultObjectUnused.kt</file>
+    <line>7</line>
+    <module>light_idea_test_case</module>
+    <entry_point TYPE="file" FQNAME="temp:///src/defaultObjectUnused.kt" />
+    <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
+    <description>Object 'Named' is never used</description>
+  </problem>
 </problems>