code: public static List<ExportsDirective>
              exportsIn(Iterable<? extends Directive> directives) {
          return listFilter(directives, DirectiveKind.EXPORTS, ExportsDirective.class);
      }
docs: Returns a list of {@code exports} directives in {@code directives}.
  @return a list of {@code exports} directives in {@code directives}
  @param directives the directives to filter
  @since 9
  @spec JPMS