diff --git a/src/borrow/shared.rs b/src/borrow/shared.rs
index ffffa0d5..8d74ae14 100644
--- a/src/borrow/shared.rs
+++ b/src/borrow/shared.rs
@@ -463,7 +463,7 @@ mod tests {
             BorrowFlagsState(
                 inner.len(),
                 base_arrays.len(),
-                base_arrays.get(key).map(|x| *x),
+                base_arrays.get(key).copied(),
             )
         } else {
             BorrowFlagsState(0, 0, None)