--- /dev/null
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+@protocol Proto1 @end
+
+@protocol Proto2 @end
+
+void f(id<Proto1> *) { } // expected-note {{previous definition is here}}
+
+void f(id<Proto1, Proto2> *) { } // expected-error {{conflicting types for 'f'}}
+
+void f(Class<Proto1> *) { } // expected-note {{previous definition is here}}
+
+void f(Class<Proto1, Proto2> *) { } // expected-error {{conflicting types for 'f'}}
+
+@interface I @end
+
+void f(I<Proto1> *) { } // expected-note {{previous definition is here}}
+
+void f(I<Proto1, Proto2> *) { } // expected-error {{conflicting types for 'f'}}
+
+@interface I1 @end
+
+void f1(I<Proto1> *) { }
+
+void f1(I1<Proto1, Proto2> *) { }