extended statement_cache with message bus events

include/matador/utils/message_bus.hpp

@@ -152,16 +152,16 @@ public:
             }
         };
 
-        std::function<bool(const T&)> filt = nullptr;
+        std::function<bool(const T&)> local_filter = nullptr;
         if (filter) {
-            filt = [w, filter = std::move(filter)](const T& m) -> bool {
+            local_filter = [w, filter = std::move(filter)](const T& m) -> bool {
                 if (w.expired()) {
                     return false;
                 }
                 return filter(m);
             };
         }
-        return subscribe<T>(std::move(handler), std::move(filt));
+        return subscribe<T>(std::move(handler), std::move(local_filter));
     }
 
     // Unsubscribe by type-specific id (RAII calls this)