Static CKPartialErrorsByItemIDKey 

pub unsafe static CKPartialErrorsByItemIDKey: &'static NSString

Available on crate feature CKError only.

When a CKErrorPartialFailure happens this key will be set in the error’s userInfo dictionary.

The value of this key will be a dictionary, and the values will be errors for individual items with the keys being the item IDs that failed.

See also Apple’s documentation