code: func (t *Torrent) onIncompletePiece(piece pieceIndex) {
  	if t.pieceAllDirty(piece) {
  		t.pendAllChunkSpecs(piece)
  	}
  	if !t.wantPieceIndex(piece) {
  		// t.logger.Printf("piece %d incomplete and unwanted", piece)
  		return
  	}
  	// We could drop any connections that we told we have a piece that we
  	// don't here. But there's a test failure, and it seems clients don't care
  	// if you request pieces that you already claim to have. Pruning bad
  	// connections might just remove any connections that aren't treating us
  	// favourably anyway.
  
  	// for c := range t.conns {
  	// 	if c.sentHave(piece) {
  	// 		c.Drop()
  	// 	}
  	// }
  	for conn := range t.conns {
  		if conn.PeerHasPiece(piece) {
  			conn.updateRequests()
  		}
  	}
  }
docs: // Called when a piece is found to be not complete.