void () { IdeaTestUtil.withLevel(getModule(), LanguageLevel.JDK_21_PREVIEW, () -> { myFixture.configureByText("Run.java", """ interface Run { public default void main(String[] args) { System.out.println("Hello from default!"); } } """); List<GutterMark> marks = myFixture.findAllGutters(); assertEmpty(marks); }); }