clang-tests/gcc-4_2-testsuite/src/obj-c++.dg/enhanced-proto-2.mm

/* APPLE LOCAL file C* language */
/* Test use of @optional/@required keywords in @protocol class. */
/* { dg-do compile } */

@protocol MyProto1 
@optional
- (void) FOO;
@optional
- (void) FOO;
@optional 
- (void) REQ;
@optional
@end

@interface  MyProto2 <MyProto1>
@required        /* { dg-error "directive may only be specified in protocols only" }  */
- (void) FOO2;
@optional        /* { dg-error "directive may only be specified in protocols only" }  */
- (void) FOO3;
@end

@implementation MyProto2
- (void) FOO2{}
- (void) FOO3{}
@end