Check / Compare NSError Code in CloudKit?

I assume this is basic, but still ... How can I check if there is a bug ZoneBusy

?

if error.code == CKErrorCode.ZoneBusy { // <- compiler says can't use '==', then what?

      

        
        
        
      

    

Link:

https://developer.apple.com/library/prerelease/ios/documentation/CloudKit/Reference/CloudKit_constants/index.html#//apple_ref/c/tdef/CKErrorCode