static boolean double_block_statement(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "double_block_statement")) return false;
    boolean r;
    Marker m = enter_section_(b);
    r = block_statement(b, l + 1);
    r = r && nls(b, l + 1);
    r = r && block_statement(b, l + 1);
    exit_section_(b, m, null, r);
    return r;
  }
static boolean double_block_statement(PsiBuilder b, int l)