1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_builtin_macros/src/format_foreign/shell/tests.rs b/compiler/rustc_builtin_macros/src/format_foreign/shell/tests.rs
index f5f82732f..93a7afcd6 100644
--- a/compiler/rustc_builtin_macros/src/format_foreign/shell/tests.rs
+++ b/compiler/rustc_builtin_macros/src/format_foreign/shell/tests.rs
@@ -39,7 +39,7 @@ fn test_iter() {
     let s = "The $0'th word $$ is: `$WORD` $!\n";
     let subs: Vec<_> = iter_subs(s, 0).map(|sub| sub.translate().ok()).collect();
     assert_eq!(
-        subs.iter().map(|ms| ms.as_ref().map(|s| &s[..])).collect::<Vec<_>>(),
+        subs.iter().map(Option::as_deref).collect::<Vec<_>>(),
         vec![Some("{0}"), None, Some("{WORD}")]
     );
 }