Method release_value

common/decl.h:100–104

  void set_value(Constant value) { mutable_value() = std::move(value); }

  ABSL_MUST_USE_RESULT Constant release_value() {
    absl::optional<Constant> released;
    released.swap(value_);
    return std::move(released).value_or(Constant{});
  }

 private:
  std::string name_;