fn prune_index_entries_for_missing_files(
watch_paths: &[WatchPathEntry],
seen_paths: &mut HashSet<String>,
sync_index: &ShardedSyncIndex,
)fn prune_index_entries_for_missing_files(
watch_paths: &[WatchPathEntry],
seen_paths: &mut HashSet<String>,
sync_index: &ShardedSyncIndex,
)