Function svn_auth_save_credentials 

pub unsafe extern "C" fn svn_auth_save_credentials(
    state: *mut svn_auth_iterstate_t,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Save a set of credentials.

Ask @a state to store the most recently returned credentials, presumably because they successfully authenticated. All allocations should be done in @a pool.

If no credentials were ever returned, do nothing.