--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaObjC/warn-messaging-id.mm	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Wno-objc-root-class -Wobjc-messaging-id %s
+
+@interface CallMeMaybe
+
+- (void)doThing:(int)intThing;
+
+@property int thing;
+
+@end
+
+template<typename T>
+void instantiate(const T &x) {
+  [x setThing: 22]; // expected-warning {{messaging unqualified id}}
+}
+
+void fn() {
+  id myObject;
+  [myObject doThing: 10]; // expected-warning {{messaging unqualified id}}
+  [myObject setThing: 11]; // expected-warning {{messaging unqualified id}}
+  instantiate(myObject); // expected-note {{in instantiation}}
+}