Indication, that intentional unused.

test/ScopeGuardTest.cpp

     {
         auto movedFrom = sr::scope_guard([&calls] { ++calls; });
         auto guard = std::move(movedFrom);
-
+        static_cast<void>(guard);
     }
 
     REQUIRE(calls == 1);
     {
         auto movedFrom = sr::scope_guard([&executed] { executed = true; });
         auto guard = std::move(movedFrom);
+        static_cast<void>(guard);
     }
 
     REQUIRE(executed == true);
         auto movedFrom = sr::scope_guard([&executed] { executed = true; });
         movedFrom.release();
         auto guard = std::move(movedFrom);
+        static_cast<void>(guard);
     }
 
     REQUIRE(executed == false);