clang/test/APINotes/Inputs/Headers/InstancetypeModule.h - third_party/github.com/llvm/llvm-project - Git at Google

 @interface Object
 @end

 @interface SomeBaseClass : Object
 + (nullable instancetype)instancetypeFactoryMethod;
 + (nullable SomeBaseClass *)staticFactoryMethod;
 @end

 @interface SomeSubclass : SomeBaseClass
 @end
	@interface Object
	@end

	@interface SomeBaseClass : Object
	+ (nullable instancetype)instancetypeFactoryMethod;
	+ (nullable SomeBaseClass *)staticFactoryMethod;
	@end

	@interface SomeSubclass : SomeBaseClass
	@end