--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaObjC/nullability-arc.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fobjc-arc -fsyntax-only -Woverriding-method-mismatch %s -verify
+
+__attribute__((objc_root_class))
+@interface NSFoo
+@end
+
+// ARC qualifiers stacked with nullability.
+void accepts_arc_qualified(NSFoo * __unsafe_unretained _Nonnull obj) {
+  accepts_arc_qualified(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
+}