1 files changed, 3 insertions, 2 deletions
diff --git a/compiler/rustc_pattern_analysis/src/constructor.rs b/compiler/rustc_pattern_analysis/src/constructor.rs
index 716ccdd4dcd..6486ad8b483 100644
--- a/compiler/rustc_pattern_analysis/src/constructor.rs
+++ b/compiler/rustc_pattern_analysis/src/constructor.rs
@@ -923,7 +923,7 @@ impl ConstructorSet {
             }
             ConstructorSet::Integers { range_1, range_2 } => {
                 let seen_ranges: Vec<_> =
-                    seen.iter().map(|ctor| ctor.as_int_range().unwrap().clone()).collect();
+                    seen.iter().map(|ctor| *ctor.as_int_range().unwrap()).collect();
                 for (seen, splitted_range) in range_1.split(seen_ranges.iter().cloned()) {
                     match seen {
                         Presence::Unseen => missing.push(IntRange(splitted_range)),
@@ -979,7 +979,8 @@ impl ConstructorSet {
             && !(pcx.is_top_level && matches!(self, Self::NoConstructors))
         {
             // Treat all missing constructors as nonempty.
-            missing.extend(missing_empty.drain(..));
+            // This clears `missing_empty`.
+            missing.append(&mut missing_empty);
         }
 
         SplitConstructorSet { present, missing, missing_empty }