pub type OpStoreInitializer<'a> = dyn Fn(&UserSettings, &Path, RootOperationData) -> Result<Box<dyn OpStore>, BackendInitError> + 'a;pub type OpStoreInitializer<'a> = dyn Fn(&UserSettings, &Path, RootOperationData) -> Result<Box<dyn OpStore>, BackendInitError> + 'a;