_session.rs

let mut request = ...;

match request.dispatch() {
    // On auth errors, dispatch request again
    Err(RequestError::Auth) => request.dispatch(),
    // Ignore other errors
    request => request
};

error

error: cannot borrow `request` as mutable more than once at a time
Err(RequestError::Auth) => request.dispatch(),
                           ^~~~~~~

note: previous borrow of `request` occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of `request` until the borrow ends
match request.dispatch() {
      ^~~~~~~
      
note: previous borrow ends here
 	match request.dispatch() {
 		// On auth errors, dispatch request again
 		Err(RequestError::Auth) => request.dispatch(),
 		// Ignore other errors
 		request => request
 	};
 	 ^