type PieceTake
import gralha-coverage@0.1.0.1/cover.bend as Coverimport Base
856# Lines whose top the row's bottom has passed become pieces; a horizontal
857# one is skipped. The cursor k walks the order array.
858type PieceTake is Data:
859 PieceTake{done: Bool, k: U32, n: U32, active: List<&2, Piece>}