code: func (t *txLookup) Range(f func(hash common.Hash, tx *types.Transaction) bool) {
  	t.lock.RLock()
  	defer t.lock.RUnlock()
  
  	for key, value := range t.all {
  		if !f(key, value) {
  			break
  		}
  	}
  }
docs: // Range calls f on each key and value present in the map.