fixed a few warnings

Author: dietmarkuehl

include/beman/execution26/detail/on.hpp

@@ -24,6 +24,8 @@
 #include <beman/execution26/detail/write_env.hpp>
 #include <utility>
 
+#include <beman/execution26/detail/suppress_push.hpp>
+
 // ----------------------------------------------------------------------------
 
 namespace beman::execution26::detail {
@@ -162,4 +164,6 @@ inline constexpr ::beman::execution26::on_t on{};
 
 // ----------------------------------------------------------------------------
 
+#include <beman/execution26/detail/suppress_pop.hpp>
+
 #endif

tests/beman/execution26/exec-on.test.cpp

@@ -11,6 +11,8 @@
 #include <test/thread_pool.hpp>
 #include <concepts>
 
+#include <beman/execution26/detail/suppress_push.hpp>
+
 // ----------------------------------------------------------------------------
 
 namespace {
@@ -43,6 +45,7 @@ auto test_interface(Sch sch, Sndr sndr, Closure closure, Both both) -> void {
 template <test_detail::sender_for<test_std::on_t> OutSndr>
 auto test_transform_env(OutSndr out_sndr) -> void {
     auto e{test_std::on.transform_env(out_sndr, test_std::empty_env{})};
+    test::use(e);
 }
 
 template <test_detail::sender_for<test_std::on_t> OutSndr>