fix mem replace unused

diff --git a/src/cargo/sources/git/utils.rs b/src/cargo/sources/git/utils.rs
index 2f54b846e3be38d30259459a824db16d1a2353dc..27fba2863f3ed339966d6dc9e9cea9becca2ff7f 100644 (file)
--- a/src/cargo/sources/git/utils.rs
+++ b/src/cargo/sources/git/utils.rs
@@ -838,7 +838,7 @@ fn maybe_gc_repo(repo: &mut git2::Repository) -> CargoResult<()> {
             );
             if out.status.success() {
                 let new = git2::Repository::open(repo.path())?;
-                mem::replace(repo, new);
+                let _ = mem::replace(repo, new);
                 return Ok(());
             }
         }