CovariantProtocolForwardDeclaration.m

// RUN: %clang -fsyntax-only %s 2>&1 | FileCheck %s
#import <Foundation/NSObject.h>

@protocol FooDelegate;
@interface Foo : NSObject
@property (weak) id<FooDelegate> delegate;
@end

@protocol FooDelegate <NSObject>
- (void)doSomething;
@end

@protocol BarDelegate;
@interface Bar : Foo
@property (weak) id<BarDelegate> delegate;
@end

@protocol BarDelegate <FooDelegate>
- (void)anotherMethod;
@end

// CHECK-NOT: warning: property type 'id<BarDelegate>' is incompatible with type 'id<FooDelegate>' inherited from 'Foo'