Method __complete

include/exec/detail/shared.hpp:277–283

    /// @post __waiters_ is set to a known "tombstone" value.
    template <class _Tag, class... _As>
    void __complete(_Tag, _As&&... __as) noexcept
    {
      STDEXEC_TRY
      {
        using __tuple_t = __decayed_tuple<_Tag, _As...>;
        __results_.template emplace<__tuple_t>(_Tag(), static_cast<_As&&>(__as)...);
      }
      STDEXEC_CATCH_ALL
      {
        if constexpr (!__nothrow_decay_copyable<_As...>)