Method start

include/exec/create.hpp:50–54

      using __state_t = __if_c<__std::same_as<__result_t, void>, __void, std::optional<__result_t>>;

      void start() & noexcept
      {
        __state_.emplace(
          __emplace_from{[&]() noexcept { return static_cast<_Fun&&>(__fun_)(__ctx_); }});
      }

      STDEXEC_IMMOVABLE_NO_UNIQUE_ADDRESS
      __context_t __ctx_;