--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaObjC/method-unused-attribute.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1  -fsyntax-only -Wunused-parameter -verify -Wno-objc-root-class %s
+
+// -Wunused-parameter ignores ObjC method parameters that are unused.
+
+// expected-no-diagnostics
+
+@interface INTF
+- (void) correct_use_of_unused: (void *) notice : (id)another_arg;
+- (void) will_warn_unused_arg: (void *) notice : (id)warn_unused;
+- (void) unused_attr_on_decl_ignored: (void *)  __attribute__((unused)) will_warn;
+@end
+
+@implementation INTF
+- (void) correct_use_of_unused: (void *)  __attribute__((unused)) notice : (id) __attribute__((unused)) newarg{
+}
+- (void) will_warn_unused_arg: (void *) __attribute__((unused))  notice : (id)warn_unused {}
+- (void) unused_attr_on_decl_ignored: (void *)  will_warn{}
+@end
+