Function tikv::storage::txn::actions::check_txn_status::rollback_lock

pub fn rollback_lock(
    txn: &mut MvccTxn, 
    reader: &mut SnapshotReader<impl Snapshot>, 
    key: Key, 
    lock: &Lock, 
    is_pessimistic_txn: bool, 
    collapse_rollback: bool
) -> Result<Option<ReleasedLock>>