Index: ios/chrome/browser/ui/tab_switcher/tab_switcher_session_changes.mm |
diff --git a/ios/chrome/browser/ui/tab_switcher/tab_switcher_session_changes.mm b/ios/chrome/browser/ui/tab_switcher/tab_switcher_session_changes.mm |
index 5d94e05d02fba6ac3cfce699ea6df45618bbad6b..61c995457fed0cbf0850156745938fc03fc2ae78 100644 |
--- a/ios/chrome/browser/ui/tab_switcher/tab_switcher_session_changes.mm |
+++ b/ios/chrome/browser/ui/tab_switcher/tab_switcher_session_changes.mm |
@@ -6,6 +6,10 @@ |
#import "ios/chrome/browser/ui/tab_switcher/tab_switcher_utils.h" |
+#if !defined(__has_feature) || !__has_feature(objc_arc) |
+#error "This file requires ARC support." |
+#endif |
+ |
TabSwitcherSessionChanges::TabSwitcherSessionChanges( |
std::vector<size_t> const& tabHashesInInitialState, |
std::vector<size_t> const& tabHashesInFinalState) { |