1 files changed, 5 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/string_slice.rs b/src/tools/clippy/tests/ui/string_slice.rs
index 440a86b104a..1d1911aaa1d 100644
--- a/src/tools/clippy/tests/ui/string_slice.rs
+++ b/src/tools/clippy/tests/ui/string_slice.rs
@@ -1,3 +1,5 @@
+use std::borrow::Cow;
+
 #[warn(clippy::string_slice)]
 #[allow(clippy::no_effect)]
 
@@ -11,4 +13,7 @@ fn main() {
     let s = String::from(m);
     &s[0..2];
     //~^ ERROR: indexing into a string may panic if the index is within a UTF-8 character
+    let a = Cow::Borrowed("foo");
+    &a[0..3];
+    //~^ ERROR: indexing into a string may panic if the index is within a UTF-8 character
 }