@Nullable
  @NlsContexts.DetailedDescription String getInconsistencyLanguageLevelMessage(@NotNull String message,
                                                                                      @NotNull LanguageLevel level,
                                                                                      @NotNull PsiFile file);
@Nullable
  @NlsContexts.DetailedDescription String getInconsistencyLanguageLevelMessage(@NotNull String message,
                                                                                      @NotNull LanguageLevel level,
                                                                                      @NotNull PsiFile file)