Method Append

testutil/expr_printer.cc:248–256

  }

  void Append(const std::string& s) {
    if (line_start_) {
      line_start_ = false;
      for (int i = 0; i < indent_; ++i) {
        s_ += "  ";
      }
    }
    s_ += s;
  }

  void AppendLine() {
    s_ += "\n";