Give warning when [super method] is not called

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Recent versions of llvm have added an attribute that indicates that subclasses must call super:

@interface Barn:NSObject
- (void)openDoor NS_REQUIRES_SUPER;
@end

@implementation Barn
- (void) openDoor
{
    ;
}
@end

@interface HorseBarn:Barn
@end
@implementation HorseBarn
- (void) openDoor
{
    ;
}
@end

Compiling the above produces the warning:

Method possibly missing a [super openDoor] call

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