def pieces.lines
import gralha-coverage@0.1.0.1/cover.bend as Coverimport Base
729def pieces.lines(xs: List<&2, Piece>, +y: F32, acc: List<&2, CovLine>) -> List<&2, CovLine>:
730 match xs:
731 case Nil{}: acc
732 case Con{p, rest}: pieces.lines(rest, y, Con{piece.line(p, y), acc})