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-rw-r--r--src/libcollectionstest/binary_heap.rs4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libcollectionstest/binary_heap.rs b/src/libcollectionstest/binary_heap.rs
index faabcf4c372..9cd63d87931 100644
--- a/src/libcollectionstest/binary_heap.rs
+++ b/src/libcollectionstest/binary_heap.rs
@@ -299,5 +299,7 @@ fn test_extend_specialization() {
 
 #[allow(dead_code)]
 fn assert_covariance() {
-    fn drain<'new>(d: Drain<'static, &'static str>) -> Drain<'new, &'new str> { d }
+    fn drain<'new>(d: Drain<'static, &'static str>) -> Drain<'new, &'new str> {
+        d
+    }
 }