llvm-project/clang/test/SemaObjC/protocol-lookup-2.m

// RUN: %clang_cc1 -fsyntax-only -verify %s
// expected-no-diagnostics
@interface NSObject @end

@protocol ProtocolA

+ (id)classMethod;
- (id)instanceMethod;

@end

@protocol ProtocolB <ProtocolA>

@end

@interface Foo : NSObject <ProtocolB>

@end

@interface SubFoo : Foo

@end

@implementation SubFoo

+ (id)method {
  return [super classMethod];
}

- (id)method {
  return [super instanceMethod];
}

@end


@protocol ProtC
-document;
@end

@interface I1 : NSObject
@end

@interface I1(cat)
-document;
@end

@interface I2 : NSObject
-document;
@end

@interface I2() <ProtC>
@end

@implementation I2
- document { return 0; }
@end