8 struct SingleSenderValueTypeHelperBadValue {};
10 template<
typename... Types>
11 using SingleSenderValueTypeHelper =
meta::Type<
14 meta::TypeConstant<SingleSenderValueTypeHelperBadValue>>>>;
17template<
typename Send,
typename Env>
18requires(concepts::SenderIn<Send, Env> &&
20 detail::SingleSenderValueTypeHelperBadValue,