Method has_value

common/decl.h:82–82

  void set_type(Type type) { mutable_type() = std::move(type); }

  ABSL_MUST_USE_RESULT bool has_value() const { return value_.has_value(); }

  ABSL_MUST_USE_RESULT const Constant& value() const
      ABSL_ATTRIBUTE_LIFETIME_BOUND {