|  | // RUN: %clang_cc1 -fsyntax-only -verify -Wno-objc-root-class %s | 
|  |  | 
|  | @protocol SUPER; // expected-note {{protocol 'SUPER' has no definition}} | 
|  |  | 
|  | @interface SUPER <SUPER> @end // expected-warning {{cannot find protocol definition for 'SUPER'}} | 
|  |  | 
|  | typedef int INTF; //  expected-note {{previous definition is here}} | 
|  |  | 
|  | @interface INTF @end // expected-error {{redefinition of 'INTF' as different kind of symbol}} | 
|  |  | 
|  | @interface OBJECT @end	// expected-note {{previous definition is here}} | 
|  |  | 
|  | @interface INTF1 : OBJECT @end // expected-note {{previous definition is here}} | 
|  |  | 
|  | @interface INTF1 : OBJECT @end // expected-error {{duplicate interface definition for class 'INTF1'}} | 
|  |  | 
|  | typedef int OBJECT; // expected-error {{redefinition of 'OBJECT' as different kind of symbol}} | 
|  |  | 
|  | typedef int OBJECT2; // expected-note 2 {{previous definition is here}} | 
|  | @interface INTF2 : OBJECT2 @end // expected-error {{redefinition of 'OBJECT2' as different kind of symbol}} | 
|  |  | 
|  | @implementation INTF2 : OBJECT2 @end // expected-error {{redefinition of 'OBJECT2' as different kind of symbol}} | 
|  |  | 
|  | @protocol PROTO; | 
|  |  | 
|  | @interface INTF3 : PROTO @end // expected-error {{cannot find interface declaration for 'PROTO', superclass of 'INTF3'}} | 
|  |  | 
|  | // Make sure we allow the following (for GCC compatibility). | 
|  | @interface NSObject @end | 
|  | typedef NSObject TD_NSObject; | 
|  | @interface XCElementUnit : TD_NSObject {} | 
|  | @end | 
|  |  | 
|  | // Make sure we don't typo-correct to ourselves. | 
|  | @interface SomeClassSub : SomeClassSup // expected-error{{cannot find interface declaration for 'SomeClassSup', superclass of 'SomeClassSub'}} | 
|  | @end |