227           using __result_t = __member_alias_t<__tfx_sequence_t, _Env>;  in __impl()  typedef
230           using __result_t = __static_member_result_t<__tfx_sequence_t, _Env>;  in __impl()  typedef
233           using __result_t = decltype(__declval<__tfx_sequence_t>()  in __impl()  typedef
237           using __result_t = tag_invoke_result_t<get_item_types_t, __tfx_sequence_t, _Env>;  in __impl()  typedef
242           using __result_t = item_types<stdexec::__decay_t<__tfx_sequence_t>>;  in __impl()  typedef
251           using __result_t = __unrecognized_sequence_error_t<_Sequence, _Env>;  in __impl()  typedef
490           using __result_t = connect_result_t<  in __select_impl()  typedef
504           using __result_t = decltype(STDEXEC_REMOVE_REFERENCE(  in __select_impl()  typedef
515           using __result_t = decltype(__declval<__tfx_sequence_t>()  in __select_impl()  typedef
526           using __result_t = tag_invoke_result_t<subscribe_t, __tfx_sequence_t, _Receiver>;  in __select_impl()  typedef
535           using __result_t = __debug::__debug_operation;  in __select_impl()  typedef