Method NextId

parser/parser.cc:203–209

  }

  int64_t NextId(const SourceRange& range) {
    auto id = expr_id_++;
    if (range.begin != -1 || range.end != -1) {
      positions_.insert(std::pair{id, range});
    }
    return id;
  }

  bool HasErrors() const { return error_count_ != 0; }