fixed a problem with the store_receiver ... get_completion_signatures

Author: dietmarkuehl

include/beman/execution/detail/store_receiver.hpp

@@ -79,13 +79,14 @@ struct store_receiver_t {
     template <::beman::execution::sender Sndr, typename Trans>
     struct sender {
         using sender_concept = ::beman::execution::sender_t;
-        template <typename... Env>
-        static consteval auto get_completion_signatures(Env&&... env) noexcept {
+        using trans_t = ::std::remove_cvref_t<Trans>;
+        template <typename, typename... Env>
+        static consteval auto get_completion_signatures() noexcept {
             return ::beman::execution::
-                get_completion_signatures<decltype(::std::declval<Trans>()(::std::declval<Sndr>())), Env...>();
+                get_completion_signatures<decltype(::std::declval<trans_t>()(::std::declval<Sndr>(), ::std::declval<Env>()...)), Env...>();
         }
         ::std::remove_cvref_t<Sndr>  sndr;
-        ::std::remove_cvref_t<Trans> trans;
+        trans_t trans;
 
         template <::beman::execution::receiver Receiver>
         auto connect(Receiver&& r) && {