1 files changed, 3 insertions, 0 deletions
diff --git a/ci/style.rs b/ci/style.rs
index dcb3536ec3..79574eb44e 100644
--- a/ci/style.rs
+++ b/ci/style.rs
@@ -134,6 +134,9 @@ fn check_style(file: &str, path: &Path, err: &mut Errors) {
                                     instead of #[cfg]");
             }
         }
+        if line.contains("#[derive(") && (line.contains("Copy") || line.contains("Clone")) {
+            err.error(path, i, "impl ::Copy and ::Clone manually");
+        }
 
         let line = line.trim_start();
         let is_pub = line.starts_with("pub ");