static boolean weak_keyword(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "weak_keyword")) return false;
    boolean r;
    r = weak_keyword_identifiers(b, l + 1);
    if (!r) r = clear_variants_and_fail(b, l + 1);
    return r;
  }
static boolean weak_keyword(PsiBuilder b, int l)