Function safe_core::recovery::del_mdata_user_permissions

Important traits for Box<R>

impl<R> Read for Box<R> where
    R: Read + ?Sized, impl<W> Write for Box<W> where
    W: Write + ?Sized, impl<I> Iterator for Box<I> where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn del_mdata_user_permissions<T: 'static>(
    client: &Client<T>, 
    name: XorName, 
    tag: u64, 
    user: User, 
    version: u64
) -> Box<CoreFuture<()>>

Deletes user permission on the mutable data and tries to recover from errors.