pub(crate) trait FinalizingCallbacks: Callbacks + Send {
// Required method
fn upcast_mut(&mut self) -> &mut (dyn Callbacks + Send);
// Provided method
fn finalize(&mut self) { ... }
}
pub(crate) trait FinalizingCallbacks: Callbacks + Send {
// Required method
fn upcast_mut(&mut self) -> &mut (dyn Callbacks + Send);
// Provided method
fn finalize(&mut self) { ... }
}