pub fn list_ids(&self) {
        self.db.take(|db| {
            db.records()
                .for_each(|(id, hint)| println!("Id: {:?}, Hint: {:?}", id, hint));
        });
    }
// list the ids and hints of all of valid records in the Vault.
list the ids and hints of all of valid records in the Vault.
list the ids and hints of all of valid records in the Vault .
pub fn list_ids(&self) {
        self.db.take(|db| {
            db.records()
                .for_each(|(id, hint)| println!("Id: {:?}, Hint: {:?}", id, hint));
        });
    }
pub fn list_ids ( & self ) { self . db . take ( | db | { db . records ( ) . for_each ( | ( id , hint ) | println ! ( " " id hint ) ) ; } ) ; }
list the ids and hints of all of valid records in the Vault.
list the ids and hints of all of valid records in the Vault .
&self