Index: ios/chrome/browser/reading_list/reading_list_web_state_observer.mm |
diff --git a/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm b/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm |
index c97630ad2c458e93139c4675aaa5bcf6ee4b4716..8a23339416116111ccfbb5b35021f326a74ccded 100644 |
--- a/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm |
+++ b/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm |
@@ -15,6 +15,10 @@ |
#include "ios/web/public/navigation_manager.h" |
#include "ios/web/public/web_state/web_state_user_data.h" |
+#if !defined(__has_feature) || !__has_feature(objc_arc) |
+#error "This file requires ARC support." |
+#endif |
+ |
#pragma mark - ReadingListWebStateObserverUserDataWrapper |
namespace { |