[java, resolve] make java lang Object as super for unnamed class

GitOrigin-RevId: dc4c8721735f98d494595cc6f03f97bd9e04d0a8

java/java-psi-impl/src/com/intellij/psi/impl/source/PsiUnnamedClassImpl.java

@@ -14,6 +14,7 @@ import com.intellij.psi.impl.light.LightEmptyImplementsList;
 import com.intellij.psi.impl.light.LightReferenceListBuilder;
 import com.intellij.psi.javadoc.PsiDocComment;
 import com.intellij.psi.scope.PsiScopeProcessor;
+import com.intellij.psi.search.GlobalSearchScope;
 import com.intellij.psi.search.LocalSearchScope;
 import com.intellij.psi.search.SearchScope;
 import com.intellij.psi.util.PsiUtil;
@@ -89,7 +90,8 @@ public class PsiUnnamedClassImpl extends JavaStubPsiElement<PsiClassStub<?>> imp
 
   @Override
   public PsiClass @NotNull [] getSupers() {
-    return PsiClass.EMPTY_ARRAY;
+    JavaPsiFacade facade = JavaPsiFacade.getInstance(getProject());
+    return new PsiClass[]{facade.findClass(CommonClassNames.JAVA_LANG_OBJECT, GlobalSearchScope.allScope(getProject()))};
   }
 
   @Override

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/unnamedClass/HashCodeInMethod.java

@@ -0,0 +1,3 @@
+void main() {
+  hashCode();
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/daemon/UnnamedClassHighlightingTest.kt

@@ -24,6 +24,10 @@ class UnnamedClassHighlightingTest : LightJavaCodeInsightFixtureTestCase() {
     doTest()
   }
 
+  fun testHashCodeInMethod() {
+    doTest()
+  }
+
   private fun doTest() {
     myFixture.configureByFile(getTestName(false) + ".java")
     myFixture.checkHighlighting()