@Override
  public @Nullable CompilerDirectHierarchyInfo getDirectInheritors(@NotNull PsiNamedElement aClass,
                                                                   @NotNull GlobalSearchScope searchScope,
                                                                   @NotNull FileType searchFileType) {
    return getHierarchyInfo(aClass, searchScope, searchFileType, CompilerHierarchySearchType.DIRECT_INHERITOR);
  }
@Override
  public @Nullable CompilerDirectHierarchyInfo getDirectInheritors(@NotNull PsiNamedElement aClass,
                                                                   @NotNull GlobalSearchScope searchScope,
                                                                   @NotNull FileType searchFileType)