Would Rust introduce Qt signal slot mechanism?

Qt Signals and Slots explained with Example Codes qt signal slot Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal Qt's signals and slots mechanism qtech slot Receiving signals with signal handlers To receive a notification when a particular signal is emitted for a particular object, the object definition should

qt connect signal slot Qt Signal & Slot implementation is deterministic, but it's using QVariant to box and then unbox values, so there is definitely a performance