Use more hashmap oriented iterators

Author: Xaeroxe

src/cargo/core/compiler/fingerprint/mod.rs

@@ -873,7 +873,7 @@ impl LocalFingerprint {
                         mtime_cache,
                         checksum_cache,
                         &dep_info,
-                        info.files.into_iter().map(|(p, _checksum)| (p, None)),
+                        info.files.into_keys().map(|p| (p, None)),
                         *checksum,
                     ))
                 }

src/cargo/core/compiler/output_depinfo.rs

@@ -61,7 +61,7 @@ fn add_deps_for_unit(
             build_runner.files().host_root(),
             &dep_info_loc,
         )? {
-            for (path, _checksum) in paths.files {
+            for path in paths.files.into_keys() {
                 deps.insert(path);
             }
         } else {