code: func WatchInputs(watchInputs ...InputWithScript) RescanOption {
  	return func(ro *rescanOptions) {
  		ro.watchInputs = append(ro.watchInputs, watchInputs...)
  	}
  }
docs: // WatchInputs specifies the outpoints to watch for on-chain spends. We also
  // require the script as we'll match on the script, but then notify based on
  // the outpoint. Each call to this function adds to the list of outpoints being
  // watched rather than replacing the list.