Fix test for just sender

Author: maikel

include/beman/execution26/detail/get_completion_behaviour.hpp

@@ -45,12 +45,16 @@ struct get_completion_behaviour_t {
 
         if constexpr (requires { typename new_sender_type::completion_behaviour; }) {
             return typename new_sender_type::completion_behaviour{};
-        } else if constexpr (requires { ::std::move(new_sender).get_completion_behaviour(std::forward<Env>(env)); }) {
-            return std::move(new_sender).get_completion_behaviour(std::forward<Env>(env));
+        } else if constexpr (requires {
+                                 new_sender(::std::forward<Sender>(sender), ::std::forward<Env>(env))
+                                     .get_completion_behaviour(std::forward<Env>(env));
+                             }) {
+            return new_sender(::std::forward<Sender>(sender), ::std::forward<Env>(env))
+                .get_completion_behaviour(std::forward<Env>(env));
         } else if constexpr (::beman::execution26::detail::is_awaitable<
                                  new_sender_type,
                                  ::beman::execution26::detail::env_promise<decayed_env>>) {
-            if (new_sender(sender, env).await_ready()) {
+            if (new_sender(::std::forward<Sender>(sender), ::std::forward<Env>(env)).await_ready()) {
                 return completion_behaviour::inline_completion;
             } else {
                 return completion_behaviour::unknown;

include/beman/execution26/detail/just.hpp

@@ -50,7 +50,7 @@ struct impls_for<just_t<Completion>> : ::beman::execution26::detail::default_imp
         }(::std::make_index_sequence<State::size()>{});
     };
 
-    static constexpr auto get_completion_behaviour = [](const auto&, const auto&, const auto&) {
+    static constexpr auto get_completion_behaviour = [](const auto&, const auto&, const auto&...) {
         return ::beman::execution26::completion_behaviour::inline_completion;
     };
 };

tests/beman/execution26/exec-get-completion-behaviour.test.cpp

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 #include <beman/execution26/detail/get_completion_behaviour.hpp>
+#include <beman/execution26/detail/just.hpp>
 
 #include <test/execution.hpp>
 
@@ -44,10 +45,17 @@ void test_constexpr_sender() {
     ASSERT(test_std::completion_behaviour::inline_completion == completion_behaviour);
 }
 
+void test_just() {
+    auto just                 = test_std::just();
+    auto completion_behaviour = test_std::get_completion_behaviour(just, test_std::empty_env{});
+    ASSERT(test_std::completion_behaviour::inline_completion == completion_behaviour);
+}
+
 } // namespace
 
 TEST(exec_get_completion_behaviour) {
     test_constexpr_awaitable();
     test_typedef_sender();
     test_constexpr_sender();
+    test_just();
 }