message: hopefully fix xcode buildbot
diff: @@ -12,8 +12,16 @@ namespace {
  template <typename T>
  std::weak_ordering operator<=>(const std::vector<T> &lhs,
  const std::vector<T> &rhs) {
  - if (lhs < rhs) return std::weak_ordering::less;
  - if (rhs < lhs) return std::weak_ordering::greater;
  + auto sz = lhs.size() <=> rhs.size();
  + if (std::is_neq(sz))
  + return sz;
  +
  + auto I = rhs.begin();
  + for (const auto &e : lhs) {
  + auto cmp = e <=> *I++;
  + if (std::is_neq(cmp))
  + return cmp;
  + }
  return std::weak_ordering::equivalent;
  }
  