Unbreak CI (#769)

Breakages were caused by a formatting issue and caching issues.

.github/workflows/nix.yaml

@@ -34,12 +34,14 @@ jobs:
         uses: >- # Custom commit, last pinned at 2024-03-03.
           DeterminateSystems/magic-nix-cache-action@742d8701e54851d2136f71b61d31382a4f4d0788
 
-      - name: Mount bazel cache
-        uses: >- # v4.0.1
-          actions/cache@ab5e6d0c87105b4c9c2047343972218f562e4319
-        with:
-          path: "~/.cache/bazel"
-          key: ${{ runner.os }}-bazel-nix
+      # TODO(aaronmondal): Figure out why this cache breaks CI.
+      # See: https://github.com/TraceMachina/nativelink/issues/772
+      # - name: Mount bazel cache
+      #   uses: >- # v4.0.1
+      #     actions/cache@ab5e6d0c87105b4c9c2047343972218f562e4319
+      #   with:
+      #     path: "~/.cache/bazel"
+      #     key: ${{ runner.os }}-bazel-nix
 
       - name: Invoke Bazel build in Nix shell
         run: |

nativelink-store/src/completeness_checking_store.rs

@@ -89,11 +89,11 @@ async fn check_output_directories(
             let tree = get_and_decode_digest::<ProtoTree>(cas_store, &tree_digest).await?;
             // TODO(allada) When `try_collect()` is stable we can use it instead.
             // https://github.com/rust-lang/rust/issues/94047
-            let mut digest_iter = tree
-                .children
-                .into_iter()
-                .chain(tree.root)
-                .flat_map(|dir| dir.files.into_iter().filter_map(|f| f.digest.map(DigestInfo::try_from)));
+            let mut digest_iter = tree.children.into_iter().chain(tree.root).flat_map(|dir| {
+                dir.files
+                    .into_iter()
+                    .filter_map(|f| f.digest.map(DigestInfo::try_from))
+            });
 
             let mut digest_infos = Vec::with_capacity(digest_iter.size_hint().1.unwrap_or(0));
             digest_iter