chore(tvix/store): Use BoxStream type alias r/7435

The BoxStream type alias is a more concise and easier to read than
the full `Pin<Box<dyn Stream<Item = ...> + Send + ...>>` type.

Change-Id: I5b7bccfd066ded5557e01f7895f4cf5c4a33bd44
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10677
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: Connor Brewster <cbrewster@hey.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/tvix/castore/src/directoryservice/utils.rs b/tvix/castore/src/directoryservice/utils.rs
index ad9ce25353..341705a8db 100644
--- a/tvix/castore/src/directoryservice/utils.rs
+++ b/tvix/castore/src/directoryservice/utils.rs
@@ -4,19 +4,18 @@ use crate::proto;
 use crate::B3Digest;
 use crate::Error;
 use async_stream::stream;
-use futures::Stream;
+use futures::stream::BoxStream;
 use std::collections::{HashSet, VecDeque};
-use std::pin::Pin;
 use tonic::async_trait;
 use tracing::warn;
 
 /// Traverses a [proto::Directory] from the root to the children.
 ///
 /// This is mostly BFS, but directories are only returned once.
-pub fn traverse_directory<DS: DirectoryService + 'static>(
+pub fn traverse_directory<'a, DS: DirectoryService + 'static>(
     directory_service: DS,
     root_directory_digest: &B3Digest,
-) -> Pin<Box<dyn Stream<Item = Result<proto::Directory, Error>> + Send>> {
+) -> BoxStream<'a, Result<proto::Directory, Error>> {
     // The list of all directories that still need to be traversed. The next
     // element is picked from the front, new elements are enqueued at the
     // back.