Static HMUserFailedAccessoriesKey 

pub unsafe static HMUserFailedAccessoriesKey: &'static NSString

Available on crate feature HMHome only.

Key that provides more details on the accessories that failed during an addUser:completionHandler: or removeUser:completionHandler: call.

The value associated with this key is an NSArray of NSDictionary objects. Each dictionary contains the UUID of the accessory that failed to the added/removed and the value corresponding to the dictionary key is an NSError that provides more details on the underlying error for that accessory.

See also Apple’s documentation