1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_mir/src/monomorphize/partitioning/merging.rs b/compiler/rustc_mir/src/monomorphize/partitioning/merging.rs
index 5107e697263..cbe36665790 100644
--- a/compiler/rustc_mir/src/monomorphize/partitioning/merging.rs
+++ b/compiler/rustc_mir/src/monomorphize/partitioning/merging.rs
@@ -46,7 +46,7 @@ pub fn merge_codegen_units<'tcx>(
         // Record that `second_smallest` now contains all the stuff that was in
         // `smallest` before.
         let mut consumed_cgu_names = cgu_contents.remove(&smallest.name()).unwrap();
-        cgu_contents.get_mut(&second_smallest.name()).unwrap().extend(consumed_cgu_names.drain(..));
+        cgu_contents.get_mut(&second_smallest.name()).unwrap().append(&mut consumed_cgu_names);
 
         debug!(
             "CodegenUnit {} merged into CodegenUnit {}",