trying to address gcc's problem with get_completion_signatures

Author: dietmarkuehl

include/beman/execution26/detail/basic_sender.hpp

@@ -21,27 +21,28 @@ namespace beman::execution26::detail
         using sender_concept = ::beman::execution26::sender_t;
         using indices_for = ::std::index_sequence_for<Child...>;
 
+#if 0
 #if __cpp_explicit_this_parameter < 302110L
         template <typename Env>
-        auto get_completion_signatures(Env&&) && noexcept
+        auto get_completion_signatures(Env&&) &&
             -> ::beman::execution26::detail::completion_signatures_for<basic_sender&&, Env>
         {
             return {};
         }
         template <typename Env>
-        auto get_completion_signatures(Env&&) const&& noexcept
+        auto get_completion_signatures(Env&&) const&&
             -> ::beman::execution26::detail::completion_signatures_for<basic_sender const&&, Env>
         {
             return {};
         }
         template <typename Env>
-        auto get_completion_signatures(Env&&) & noexcept
+        auto get_completion_signatures(Env&&) &
             -> ::beman::execution26::detail::completion_signatures_for<basic_sender&, Env>
         {
             return {};
         }
         template <typename Env>
-        auto get_completion_signatures(Env&&) const& noexcept
+        auto get_completion_signatures(Env&&) const& 
             -> ::beman::execution26::detail::completion_signatures_for<basic_sender const&, Env>
         {
             return {};
@@ -54,6 +55,7 @@ namespace beman::execution26::detail
         {
             return {};
         }
+#endif
 #endif
     };
 }

src/beman/execution26/tests/exec-snd-expos.pass.cpp

@@ -1109,6 +1109,7 @@ namespace
 
         basic_sender bs{ basic_sender_tag{}, data{}, sender0 {} };
         basic_sender const& cbs{bs};
+        use(cbs);
 
         auto&&[a, b, c] = bs;
         use(a);
@@ -1133,6 +1134,7 @@ namespace
             basic_sender_tag::sender::completion_signatures,
             test_detail::completion_signatures_for<basic_sender, env>
         >);
+#if 0
         static_assert(std::same_as<
             basic_sender_tag::sender::completion_signatures,
             decltype(bs.get_completion_signatures(env{}))
@@ -1146,6 +1148,7 @@ namespace
             decltype(basic_sender{ basic_sender_tag{}, data{}, sender0 {} }
                 .get_completion_signatures(env{}))
         >);
+#endif
         static_assert(std::same_as<
             std::index_sequence_for<sender0>,
             basic_sender::indices_for