clang/test/Modules/Inputs/objc-category-2/Base.h - llvm-project - Git at Google

 @interface DVTSourceModel // expected-error {{duplicate interface definition for class}} \
                           // expected-note {{previous definition is here}}
 @end
	@interface DVTSourceModel // expected-error {{duplicate interface definition for class}} \
	// expected-note {{previous definition is here}}
	@end