fixed issue-144: just using std::movable

Author: dietmarkuehl

include/beman/execution/detail/just.hpp

@@ -8,6 +8,7 @@
 #include <beman/execution/detail/set_stopped.hpp>
 #include <beman/execution/detail/set_value.hpp>
 #include <beman/execution/detail/make_sender.hpp>
+#include <beman/execution/detail/movable_value.hpp>
 #include <beman/execution/detail/product_type.hpp>
 #include <beman/execution/detail/completion_signatures_for.hpp>
 #include <beman/execution/detail/impls_for.hpp>
@@ -27,7 +28,7 @@ concept just_size = (not::std::same_as<Completion, ::beman::execution::set_error
 template <typename Completion>
 struct just_t {
     template <typename... T>
-        requires ::beman::execution::detail::just_size<Completion, T...> && (::std::movable<::std::decay_t<T>> && ...)
+        requires ::beman::execution::detail::just_size<Completion, T...> && (::beman::execution::detail::movable_value<T> && ...)
     auto operator()(T&&... arg) const {
         return ::beman::execution::detail::make_sender(
             *this, ::beman::execution::detail::product_type{::std::forward<T>(arg)...});

tests/beman/execution/CMakeLists.txt

@@ -11,6 +11,7 @@ endif()
 list(
   APPEND
   execution_tests
+  issue-144.test
   exec-on.test
   notify.test
   exec-scounting.test

tests/beman/execution/issue-144.test.cpp

@@ -0,0 +1,11 @@
+// tests/beman/execution/issue-144.test.cpp                           -*-C++-*-
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include <beman/execution/execution.hpp>
+
+namespace bex = beman::execution;
+
+int main() {
+    double d = 19.0;
+    bex::just([d](auto) { return d; });
+}